31 December 2025, Volume 13 Issue 6

    

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  Construction and Electrochemical Performance of V₂O₃@C/S-Based Solid-State Lithium-Sulfur Batteries

  ZHOU Hengxue, ZHONG Qiufang, LONG Yi, WANG Jialiang, YAO Yingbang, LIANG Bo, LU Shengguo, TAO Tao

  Advances in New and Renewable Energy. 2025, 13(6): 601-609. https://doi.org/10.3969/j.issn.2095-560X.2025.06.001

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  A V₂O₃@C/S composite cathode material is successfully synthesized using a combination method of solution-based, hydrothermal, and high-temperature carbonization techniques. The resulted composite cathode is employed with a BN/PVDF-HFP composite solid-state electrolyte to assemble a high-performance lithium-sulfur (Li-S) battery. The V₂O₃@C composite exhibits excellent structural stability, high conductivity, good sulfur adsorption, and catalytic activity. The V₂O₃@C/S cathode-based Li-S cells exhibit higher initial specific capacity, rate performance, and cycle stability compared to the conventional C/S cathode. At a 0.1 C rate, the V₂O₃@C/S cathode delivers an initial specific capacity of 1 125 mA∙h/g, with a capacity retention of 67.1% after 150 cycles. At a 0.5 C rate, the capacity retention after 250 cycles is 45.5%. Cyclic voltammetry, impedance spectroscopy, and Tafel analysis confirm the superior performance of the V₂O₃@C/S cathode for enhancing reaction kinetics and reducing charge transfer resistance. This work provides an effective strategy for designing high-performance cathodes of lithium-sulfur batteries.
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  Synthesis and Application of Organosilicon Amine as Electrolyte Additives for Lithium Manganese Iron Phosphate Batteries

  WANG Kang, SHAO Dan, WU Aihua, LI Xiangfeng, HU Liangyong, CHEN Cheng, YANG Guijun, ZHANG Lingzhi

  Advances in New and Renewable Energy. 2025, 13(6): 610-617. https://doi.org/10.3969/j.issn.2095-560X.2025.06.002

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  Lithium manganese iron phosphate (LiMnxFe_1−xPO₄, LMFP) material has the advantages of high energy density, excellent safety, and low-temperature performance, which is under intensive development in the industry of lithium-ion batteries. However, the intrinsic electronic conductivity and lithium ion diffusion rate of LMFP are low, resulting in poor rate performance. Furthermore, the lattice distortion caused by the Jahn-Teller effect and the dissolution of Mn ions during charging and discharging result in a rapid decay of battery capacity. In this work, a novel organosilicon compound [3-(N, N-dimethylamino) dioxypropyl] pentamethyldisiloxane (DSON) electrolyte-added cathode film-forming additive was designed and synthesized to suppress the Jahn-Teller effect and improve the electrochemical performance of LMFP batteries. It was found that DSON could form a uniform and stable cathode electrolyte interfacial film, effectively inhibiting the side reaction between the cathode material and the electrolyte, and significantly improve the electrochemical performance at both room and high temperatures. At 25 °C, compared with the LMFP/Li cell using a base electrolyte, the capacity retention of the LMFP/Li cell with 0.2% DSON electrolyte increases from 81.8% to 85.3% after 200 cycles at 0.5 C. At 55 ^oC, the capacity retention of the cell with DSON electrolyte increased from 69.8% to 83.3% after 200 cycles at 0.5 C.
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  Molecular Dynamics Simulation of the Crystal Growth Process of CH₄/CO₂/N₂ Gas Mixture Hydrates

  YANG Yifan, CHEN Yong, ZANG Xiaoya, LIANG Deqin

  Advances in New and Renewable Energy. 2025, 13(6): 618-624. https://doi.org/10.3969/j.issn.2095-560X.2025.06.003

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  The utilization of biogas is a key link in China's future sustainable energy development, and its combustion efficiency is directly related to the concentration of CH₄, so it needs to be pre-treated for purification before the utilization of biogas. Hydrate-based gas separation technology offers advantages such as environmental friendliness, simple operation, high separation efficiency, and excellent selectivity, making it a highly promising gas separation technique. Molecular dynamics simulations were employed to investigate the growth of hydrates formed from ternary mixtures of biogas components (CH₄/CO₂/N₂), exploring the principles governing changes in hydrate growth rates. It provides additional data support and a theoretical basis for applying hydrate-based gas capture technology in biogas purification. Results indicate that the hydrate growth rate is fastest at a molar ratio of CH₄/CO₂/N₂ = 14:5:1, while it is slowest at 1:1:1. Stagnation and high-probability growth failure occur during hydrate formation at the latter ratio, suggesting that equimolar mixtures are unfavorable for hydrate growth. Across different ternary systems, hydrate growth rates exhibited non-uniform patterns with frequent fluctuations. Growth rates correlated with cage-like structures: regions dominated by 5¹²6² cages accelerated hydrate formation significantly, while those dominated by 5¹² cages slowed it down.
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  Mechanical Properties of Methane Hydrate-bearing Fine Sand under Gas/Water-Saturated Conditions: Based on the Frost-seeding Method

  CHEN Baiying, LIN Deyou, WU Qi, YANG Dehuan, YAN Rongtao, LU Jingsheng, WANG Guoyan

  Advances in New and Renewable Energy. 2025, 13(6): 625-635. https://doi.org/10.3969/j.issn.2095-560X.2025.06.004

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  The mechanical properties of submarine hydrate-bearing sediments are crucial for the safe exploitation of hydrate resources. A series of consolidated drained triaxial compression tests was conducted to systematically investigate the mechanical behavior of methane hydrate-bearing fine sand specimens prepared using the frost-seeding and excess-gas methods under gas/water saturated conditions. The results show that specimens prepared by the excess-gas method exhibited higher shear strength and stiffness under gas-saturated conditions, along with more pronounced strain-softening and dilative behavior compared to those from the frost-seeding method. The strain-softening behavior is jointly governed by hydrate saturation and confining net stress. After water saturation, the hydrate pore habit transitioned to a non-cementing type, resulting in significant alterations to the stress-strain curves. For specimens prepared by the frost-seeding method, the shear strength increased linearly with hydrate saturation. Under gas-saturated conditions, the magnitude of shear strength increase diminished as the confining net stress rose; however, in the water-saturated system, the strength increase was independent of the confining net stress. The strength degradation induced by the change in saturation state is primarily attributed to a decrease in cohesion. The combined frost-seeding and water saturation technique provides an effective approach for reconstructing non-cemented hydrate-bearing sediment specimens, offering critical support for investigating their mechanical properties and advancing resource development.
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  Research Progress on Lignin-Based Electrode Materials for Supercapacitors

  WANG Xiaolong, ZHANG Quan, TAN Xuesong, MIAO Changlin, YANG Tianhua, ZHUANG Xinshu

  Advances in New and Renewable Energy. 2025, 13(6): 636-645. https://doi.org/10.3969/j.issn.2095-560X.2025.06.005

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  Driven by the carbon peaking and carbon neutrality goals, highly efficient and economical energy-storage technologies are urgently required. Supercapacitors have emerged as a current research focus due to their rapid charge-discharge capability, high efficiency, and ultra-long lifespan. Notably, electrode materials directly influence the performance of supercapacitors. Among the precursors selection of electrode materials, lignin stands out owing to its unique structural characteristics. However, lignin derived from different plant sources and via distinct separation technologies exhibits variations in chemical composition and microstructure, which may significantly affect its performance as an electrode material for supercapacitors. Currently, there is relatively limited research on the properties of lignin-based electrode materials. Therefore, this paper first introduces the characteristics of lignin-derived porous carbons obtained through different lignin types and pretreatment separation methods, as well as their applications in supercapacitors. It also summarized the electrochemical properties of lignin-based porous carbons prepared by various methods. Subsequently, the paper outlined the application status of lignin-based porous carbons in pseudocapacitors, employing strategies such as heteroatom doping and the use of conductive polymer composites. Finally, the directions for improving the performance of lignin-based electrode materials and their application prospects in composite electrode materials were prospected.
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  Research Progress on Enhancing Hydrothermal Stability of Solid Acid for Biomass Conversion Process

  JU Miaomiao, LIU Yunyun, CUI Yanran, LI Zhenglong, WANG Qiong

  Advances in New and Renewable Energy. 2025, 13(6): 646-653. https://doi.org/10.3969/j.issn.2095-560X.2025.06.006

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  Solid acids represent an important class of heterogeneous catalysts and play a key role in biomass conversion processes. Compared to liquid acid catalysts, solid acids exhibit distinct advantages including ease of separation and regeneration, high temperature tolerance, and environmental friendliness. However, industrial applications have mainly been hindered by issues such as poor hydrothermal stability and limited recyclability. This review systematically summarized design strategies and research progress in enhancing the hydrothermal stability of solid acids, focusing on three representative systems: metal oxides improve erosion resistance by constructing stable crystal phases and carbon coatings; zeolites enhance structural stability through adjustment of the silicon-to-aluminum ratio and composite modification; carbon-based solid acids stabilize acid sites via porous structure optimization, introduction of hydrophobic components, and novel sulfonation techniques. The research results will provide theoretical guidance for the design and development of high-performance solid acid catalysts.
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  Hydrogen Permeation Characteristics and Testing Methodology for Polymer Pipes

  ZHANG Honglin, LIN Yuanhua, LI Tianlei, XIAO Jie, WANG Yaxi, LI Ke

  Advances in New and Renewable Energy. 2025, 13(6): 654-661. https://doi.org/10.3969/j.issn.2095-560X.2025.06.007

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  A pressure difference-based method for polymer hydrogen permeation testing is proposed, and an apparatus is developed to elucidate the permeation behavior of hydrogen in polymer pipes. In this apparatus, the high-pressure side tank is used to fill hydrogen and set the test pressure. The permeation side tank is equipped with a hydrogen concentration detection sensor, enabling real-time in-situ monitoring of the hydrogen permeation concentration . Hydrogen permeation tests were conducted on high-density polyethylene (HDPE) and polypropylene (PP) under varying hydrogen pressures ranging from 1 MPa to 4 MPa, and sample thicknesses ranging from 2 mm to 6 mm at ambient temperature. The crystallinity of the HDPE and PP samples was characterized using X-ray diffraction analysis. The results indicate that the steady-state hydrogen permeation rates of HDPE and PP increase with rising hydrogen pressure, yet decrease as thickness increases. The hydrogen permeability coefficients for both materials remain largely consistent at the same thickness across varying pressures. The hydrogen permeability coefficients obtained in this study are of the same order of magnitude as those reported in existing literature. The crystallinity of HDPE is higher than that of PP, resulting in a lower steady-state hydrogen permeation rate. These findings validate the rationality of the testing methodology employed in this study. They can offer valuable technical guidance for the selection and design of non-metallic hydrogen transport pipes and elastomeric seals.
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  Application of Spiral Flat Tube Energy Recovery Devices in Clean Laboratory Ventilation Systems

  HUANG Wenbin, LIU Shijie, CHEN Zilin, HUANG Sen, WANG Jingkai, ZHU Dongsheng

  Advances in New and Renewable Energy. 2025, 13(6): 662-671. https://doi.org/10.3969/j.issn.2095-560X.2025.06.008

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  To explore the energy-saving effects of spiral flat tubes in ventilation systems, a certain clean laboratory energy recovery device is taken as the research object, with a focus on analyzing the performance characteristics of spiral flat tubes with different ratios of major to minor axes, including the flow field, heat transfer performance, temperature exchange efficiency, resistance, and the performance factor of the energy recovery device. The study employs the numerical simulation method to conduct an in-depth exploration of the of the energy recovery device's performance and validates the model's reliability through real-time test data. The research findings indicate that, compared with the conventional round tubes, the heat transfer coefficient of spiral flat tubes is increased by 1.29 times, the temperature exchange efficiency is enhanced by 8.6%, the performance factor is augmented by 1.14 times, effectively improving the energy recovery efficiency. The heat recovery efficiency of the spiral flat tubes energy recovery device in winter and summer reaches 78.5% and 73.2%, respectively, providing some references and more options for the design and optimization of clean laboratory ventilation systems.
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  Research Progress on the Biological Treatment Effect of Thermophilic Anaerobic Membrane Bioreactor

  ZHANG Liangmiao, HUANG Jiu, QIAO Wei, JIANG Mengmeng

  Advances in New and Renewable Energy. 2025, 13(6): 672-680. https://doi.org/10.3969/j.issn.2095-560X.2025.06.009

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  To investigate the efficiency and energy recovery potential of thermophilic anaerobic membrane bioreactor (ThAnMBR) in treating various types of organic wastes, the effectiveness of ThAnMBR in the treatment of alcohol distillation wastewater, food wastewater, sludge, paper wastewater, and livestock waste was evaluated, and the energy efficiency difference between thermophilic and mesophilic treatment. The ThAnMBR perform excellently in terms of chemical oxygen demand (COD) removal rate and methane production, achieving over 90% COD removal efficiency and high biogas production rates. Furthermore, the system demonstrates the potential for energy self-sufficiency, contributing to the sustainable development of wastewater treatment. This study provides valuable references for the development of ThAnMBR in China, and highlights its potential application value in treating high-temperature wastewater and promoting resource recovery.
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  Combustion Characteristics of High-Power Natural Gas Burners with Hydrogen Enrichment for Industrial Furnaces

  WU Honghao YANG Wenwei, HONG Xubiao, XIE Linhao, ZHONG Xiangwei, CHEN Shuohan, WANG Xiaohan, ZENG Xiaojun

  Advances in New and Renewable Energy. 2025, 13(6): 681-689. https://doi.org/10.3969/j.issn.2095-560X.2025.06.010

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  To meet the decarbonization needs of the ceramic industry, a study was conducted on the hydrogen-enriched combustion characteristics of a high-power natural gas burner for ceramic kilns. The results indicate that hydrogen blending elongates the two localized high-temperature zones within the prechamber. Furthermore, a higher hydrogen proportion causes the bottom of the lower high-temperature zone to shift closer to the burner head, thus increasing the risk of high-temperature damage to the combustion chamber head. Due to the preferential reaction between H₂ and O₂, the CH₄ conversion rate in the prechamber exhibits a trend of initially decreasing and then increasing with hydrogen enrichment—being suppressed in the initial combustion stage and promoted in the high-temperature combustion stage. Concurrently, hydrogen blending inhibits the conversion of the intermediate combustion product CO, resulting in higher CO concentrations within the prechamber as the hydrogen blending ratio increases. In thermal tests, the burner achieved stable combustion with an efficiency of over 99.9% combustion across hydrogen blending ratios ranging from 0% to 50% by volume. Under constant power output, the maximum increases in kiln heating temperature and exhaust temperature were 28.5 K and 14.2 K, respectively, indicating a minor overall enhancement compared to operation with pure natural gas. When the hydrogen blending ratio was between 0% and 30%, the increase in NO_x emissions at the kiln exit ranged from 6% to 9%. However, as the hydrogen blending ratio increased from 30% to 50%, NO_x emissions rose sharply by up to 21%. The study demonstrates that hydrogen blending ratios of 0% to 50% can meet the heating temperature requirements of ceramic kilns when using this high-power natural gas burner. Nevertheless, excessive hydrogen blending exacerbates the risk of high-temperature damage to both the burner head and the prechamber head, while also leading to a dramatic increase in NO_x emissions.
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  Effect of Geotechnical Stratification and Seepage on the Performance of Coaxial Casing Heat Exchangers

  WANG Ye, YUE Pan

  Advances in New and Renewable Energy. 2025, 13(6): 690-697. https://doi.org/10.3969/j.issn.2095-560X.2025.06.011

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  To study the heat transfer performance of the coaxial casing heat exchanger in the medium and deep layers, considering the soil temperature gradient, geological stratification, and groundwater seepage simultaneously, an analytical and layered model was proposed to resolve the temperature response between the layers around the borehole and the fluid in the annular cavity. The results show that the temperature curve obtained by the layered model in the depth direction is closer to physical reality compared with the homogeneous model. The homogeneous model will underestimate the outlet temperature of geothermal wells, whether the seepage effect is considered or not. The maximum relative deviation in the prediction results for the radial temperature of the outer pipe wall, resulting from the seepage effect, is 23.3%. When the seepage layer is located 2 000 meters underground, the critical seepage velocity of heat conduction between the stratum and the pipe wall is 5 × 10−7 m/s, while the heat exchange between the stratum and the pipe wall is mainly carried out by thermal convection when the seepage velocity is greater than 1 × 10−5 m/s. The temperature of the outer pipe wall increases by 56.7% due to the seepage. The vertical permeability of the seepage layer leads to an increase in the thermal conductivity of the region outside the boundary, thereby increasing the outlet temperature of the geothermal well. For the same heat extraction, considering the seepage effect can reduce the buried depth of the geothermal well.
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  Research Status and Application of Wave Energy Resource Assessment

  ZHANG Yaqun, WANG Zhenpeng, YE Yin, WU Min, TAN Yong

  Advances in New and Renewable Energy. 2025, 13(6): 698-703. https://doi.org/10.3969/j.issn.2095-560X.2025.06.012

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  With the proposal of the strategy of building a maritime power and the dual carbon goals, the development of marine resources has become the core of China's scientific and technological development. Wave energy resource assessment is a method for gaining a deeper understanding of marine resources. The application scenarios of wave energy resource assessment were analyzed from three aspects: site planning and selection, feasibility studies, and design and development. The development status of the four methods for wave energy resource assessment was presented in chronological order. The current situation of wave energy resource assessment at home and abroad was discussed, and the sea areas where assessments have been carried out in China were statistically analyzed. Finally, through summary and comparative analysis, the differences in the assessment of wave energy resources are revealed in the performance evaluation of wave energy power generation systems. The research results can provide a reference and guidance for the development and utilization of wave energy, and contribute to China's marine construction.
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  Research Progress on Ruthenium-Based Alkaline Hydrogen Oxidation Catalysts

  XU Yanru, YANG Xiaodong, SHEN Qi, SUN Yiqiang

  Advances in New and Renewable Energy. 2025, 13(6): 704-724. https://doi.org/10.3969/j.issn.2095-560X.2025.06.013

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  It is crucial to develop and utilize sustainable clean energy to achieve the strategic goals of carbon peak and carbon neutrality. In particular, the utilization of hydrogen fuel cells represents a significant technological approach towards enhancing the cyclical regeneration. With the development of anion exchange membranes and platinum-free catalysts for cathodic oxygen reduction under alkaline conditions, anion exchange membrane fuel cells (AEMFCs) have shown excellent application prospects. Among them, anodic hydrogen oxidation reaction (HOR) emerges as a pivotal constraint on performance, predominantly attributed to the diminished kinetic rates observed in alkaline environments. Ruthenium (Ru) has been regarded as a potential substitute for platinum in fuel cells due to its suitable hydrogen binding energy, oxygen affinity, and relatively low cost. Therefore, elucidating the catalytic mechanism of ruthenium-based catalysts for HOR in alkaline media is of significant importance for the development of highly efficient and stable catalysts. This article first introduces the basic mechanism of electrocatalytic HOR under alkaline conditions. Subsequently, a systematic classification and summary of reasonable design strategies for ruthenium-based HOR catalysts were conducted from the perspective of activity descriptors. Additionally, the practical application of ruthenium-based catalysts in fuel cells was introduced. Finally, prospects were created for the development of low-cost, stable, and efficient synthesis strategies for ruthenium-based HOR catalysts.