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Electrochemical conversion of methane to bridge the gap in the artificial carbon cycle

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Journal of energy Chemistry 2025年第1期100卷 286-308页

作者： Yuhao Peng Yuefeng Song Ihar Razanau Juanxiu Xiao Wei Xiao Di Hu Guoxiong Wang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University State key laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences laboratory of Physical-Chemical Technologies SSPA Scientific and Practical Materials Research Centre of NAS of Belarus State key laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University Department of Chemical and Environmental Engineering University of Nottingham Ningbo China

Methane, an abundant one-carbon（C1） resource, is extensively used in the industrial production of vital fuels and value-added chemicals. However, current industrial methane conversion technologies are energy-and carbon-intensive, mainly due to the high activation energy required to break the inert C–H bond, low selectivity, and problematic side reactions, including CO2emissions and coke deposition. Electrochemical conversion of methane（ECM） using intermittent renewable energy offers an attractive solution, due to its modular reactor design and operational flexibility across a broad spectrum of temperatures and pressures. This review emphasizes conversion pathways of methane in various reaction systems, highlighting the significance and advantages of ECM in facilitating a sustainable artificial carbon cycle. This work provides a comprehensive overview of conventional methane activation mechanisms and delineates the complete pathways of methane conversion in electrolysis contexts. Based on surface/interface chemistry, this work systematically analyzes proposed reaction pathways and corresponding strategies to enhance ECM efficiency towards various target products, including syngas, hydrocarbons, oxygenates, and advanced carbon materials. The discussion also encompasses opportunities and challenges for the ECM process, including insights into ECM pathways, rational electrocatalyst design, establishment of benchmarking protocols, electrolyte engineering, enhancement of CH4conversion rates, and minimization of CO2emission.

关键词： Activation energy

Shape-stablized EP/Paraffin Composite for Latent Heat Storage

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Journal of Wuhan University of technology(Materials Science) 2013年第4期28卷 682-687页

作者：李文浩徐玲玲 WEI Yanling College of Materials Science and Engineering Nanjing University of Technology jiangsu key laboratory of process enhancement & new energy equipment technology (Nanjing University of technology)

620# and 56# paraffin mixtures were impregnated into expanded perlite （EP） by vacuuming method. Effects of impregnation with/without vacuum, vacuuming time, and thermal cycles were discussed. The appropriate mass fraction of paraffin mixture in the composite and vacuuming time were found respectively to be 80% and 20 min. Fourier transform infrared spectrometer （FT-IR） analysis shows that it has a good compatibility between paraffin mixture and EP. From differential scanning calorimetry （DSC） analysis, the latent heat of EP/Paraffin mixture composite is almost linearly related with the mass fraction of paraffin mixture in the composite. After 100 thermal cycles, the deviation of phase change temperatures is acceptable, but more deviation of latent heat appears. The calcium stearate dispersing granule coated by epoxy resin can effectively lower leakage during thermal cycles.

关键词： paraffin mixture expanded perlite vacuum impregnation thermal cycle test

An Experimental Investigation on Heat Transfer Performance of Nanofluid Pulsating Heat Pipe

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Journal of Thermal Science 2013年第5期22卷 484-490页

作者： Hongwei Jia Li Jia Zetao Tan Institute of Thermal energy Engineering School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University jiangsu key laboratory of process enhancement & new energy equipment technology Nanjing University of technology

The effect of SiO2 particles on heat transfer performance of a pulsating heat pipe （PHP） was investigated experi- mentally. DI water was used as the base fluid and contrast medium for the PHP. In order to study and measure the character, there are SiO2/H20 nanofluids with different concentration and applying with various heating powers during the experiment investigation. According to the experimental result, the high fraction of SiO2/H20 will de- teriorate the performance of PHP compared with DI water, i.e. the thermal resistance and the temperature of evaporation section increases. It is in contrary in the case of low fraction of SiO2/H20. Finally, the comparison of the thermal performances between the normal operation system and the static settlement system is given. It is found that both the thermal resistance of nanofluid PHP and the temperature of the evaporation section increase after standing for a period, and it is the same trend for the temperature fluctuation at the identical heating power for PHP.

关键词： Nanofluid Pulsating heat pipe Heat transfer characteristics Suspension characteristics

Evaporating Momentum Force and Shear Force on Meniscuses of Elongated Bubble in Microchannel Flow Boiling

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Journal of Thermal Science 2014年第2期23卷 160-168页

作者： YIN Liaofei JIA Li GUAN Peng LIU Fuhao Institute of Thermal Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong University jiangsu key laboratory of process enhancement & new energy equipment technology (Nanjing University of technology)

The evaporating momentum force and the shear force acting on the meniscus of an evaporating and elongating bubble in flow boiling in microchannel have been investigated theoretically and *** concept of the effective evaporation region and the theory of the liquid layer supplement between elongated bubble and microchannel are proposed,and the analytical expressions of the evaporating momentum force and shear force have been *** relative importance of both forces has been determined by the method of magnitude analysis and numerical *** has been found that the evaporating momentum force can always be neglected in analyzing the bubble elongation process and the motion law of meniscus of elongated bubble in microchannel flow boiling,but whether the shear force should be considered or not is determined by its relative order of magnitude and the particular conditions such as channel dimension and the operating conditions.

关键词： microchannel flow boiling elongated bubble evaporating momentum force shear force

An Experimental Investigation on the Confined and Elongated Bubbles in Subcooled Flow Boiling in a Single Microchannel

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Journal of Thermal Science 2012年第6期21卷 549-556页

作者： Liaofei Yin Li Jia Peng Guan Fuhao Liu Institute of Thermal Engineering School of Mechanical Electronic and Control Engineering Beijing Jiaotong Uni-versity Beijing 100044 China jiangsu key laboratory of process enhancement & new energy equipment technology (Nanjing University oftechnology

The characteristics of the confined bubble and elongated bubble in subcooled flow boiling in a single horizontal rectangular microchannel with hydraulic diameter Dh=1mm are studied experimentally. The channel with 1 ×1mm cross section is fabricated in a thin copper plate whose confinement number is Co=2.8 and the degassed deionized water is used as the working fluid. Visualization on the confined and elongated bubbles inside the microchannel is carded out by employing a high-speed CCD camera with a rnicrolens. The recorded images are carefully analyzed to illustrate the behaviors of the confinement and elongation processes of the bubble. The boiling number is used as an adjustable parameter to regulate the operating conditions which is eventually found to take a vital role in the bubble elongation process. Two formation patterns of the confined and elongated bubble are identified and the interactions between the neighboring confined and elongated bubbles are elucidated.

关键词： visualization flow boiling rectangular microchannel confined bubble elongated bubble

Simulated biomass tar removal mechanism by a Quench Coupled with ADsorption technology(QCADT)

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Chinese Journal of Chemical Engineering 2020年第1期28卷 279-285页

作者： Xiaosong Zhang Jiawei Pan Liang Wang Hongqi Sun Yuezhao Zhu Haijun Chen jiangsu key laboratory of process enhancement and new energy equipment technology Jiangsu Engineering Laboratory of Energy Conservation and Environmental Protection Technologies and Equipment in Process IndustryNanjing 211816China School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China College of Chemistry and Chemical Engineering Nanjing Tech UniversityNanjing 210009China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupWA6027Australia

Tar removal is a bottleneck in the smooth commercialization of biomass gasification technology. Based on introducing adsorption process into Quench Coupled with ABsorption technology(QCABT) previously proposed by the author’s group, Quench Coupled with ADsorption technology(QCADT) has been developed to narrow this gap. Additionally, benzene and naphthalene, which are more similar to the real tar for containing aromatic ring structures, were adopted as light and heavy simulated tar, respectively. Also their removal behavior by QCADT was investigated. The results show that the removal mechanism of QCADT is similar to that of QCABT, except for the higher overall tar removal rate due to adsorption effect. Adsorbents with both micro-and narrow mesopores exhibit a better benzene removal performance, while narrow mesopores play dominant roles in naphthalene removal. Penetration adsorption loading of benzene and naphthalene on AC-1 can reach0.38 g·g^-1 and 0.34 g·g^-1, respectively. The sawdust hardly has any tar removal effect. Combined micro-and meso-pores, will benefit both deep tar removal and large adsorption rate, providing a high tar removal efficiency.

关键词： Biomass gasification Tar removal Adsorption Couple Pore

Deformation Behavior and Formability of Gradient Nano-grained AISI 304 Stainless Steel processed by Ultrasonic Impact Treatment

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Journal of Wuhan University of technology(Materials Science) 2017年第5期32卷 1147-1155页

作者：杨新俊 LING Xiang WANG Dongxiang 王伟 jiangsu key laboratory of Advanced Food Manufacturing equipment & technology School of Mechanical Engineering Jiangnan University Wuxi 214122 China jiangsu key laboratory of process enhancement and new energy equipment technology School of Mechanical and Power Engineering Nanjing Tech University Nanjing 211816 China School of Automotive Engineering Wuhan University of Technology Wuhan 430070 China Hubei Province key laboratory of Modern Automotive technology Wuhan 430070 China Hubei Province Automotive Parts Synergy Innovation Center Wuhan 430070 China

The deformation behavior and formability of gradient nano-grained（GNG） AISI 304 stainless steel in uniaxial and biaxial states were investigated by means of tensile test and small punch test（SPT）. The GNG top layer was fabricated on coarse grains（CG） AISI 304 by ultrasonic impact treatment. The results showed that the CG substrate could effectively suppress the strain localization of NC in GNG layer, and an approximate linear relationship existed between the thickness of substrate（h） and uniform true strain before necking（ε_（unif））. Grain growth of NC was observed at the stress state with high Stress triaxiality T, which led to better ductility of GNG/CG 304 in SPT, as well as similar true strain after the onset of necking（ε_（neck）） compared with coarse 304 in tensile test. Ei-values of GNG/CG 304 with different structures were nearly the same at different punch speeds, and good formability of GNG/CG 304 was demonstrated. However, punch speed and microstructure needed to be optimized to avoid much lost of membrane strain region in biaxial stress state.

关键词： gradient nano-grained structure deformation behavior formability ultrasonic impact treatment AISI 304 stainless steel

Recent progress of mesoscience in design of electrocatalytic materials for hydrogen energy conversion

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Particuology 2020年第1期18卷 19-33页

作者： Lishan Peng Zidong Wei The State key laboratory of Power Transmission equipment&System Security and new technology Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource UtilizationSchool of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China

Electrocatalytic materials with different morphologies,sizes,and components show different catalytic behavior in various heterogeneous catalytic *** has been proved that the catalytic properties of these materials are strongly influenced by several factors at different levels,including the electrode morphology,reaction channels,three-phase interface,and surface active *** developments of mesoscience allow one to study the relationship between the apparent catalytic performance of electro-catalytic materials with these factors from different *** this review,following a brief introduction of new mesoscience,we summarize the effect of mesoscience on electrocatalytic material design,including modulating the geometric and electronic structures of materials focusing on morphology(particulate,fiber,film,array,monolith,and superlattice),pore structure(microporous,mesoporous,and hierarchical),size(single atoms,nanoclusters,and nanoparticles),multiple components(alloys,heterostructures,and multiple ligands),and crystal structures(crystalline,amorphous,and multiple crystal phases).By evaluating the electrocatalytic performance of catalytic materials tuned at the mesoscale,we paint a picture of how these factors at different levels affect the final system performance and then provide a new direction to better understand and design catalytic materials from the viewpoint of mesoscience.

关键词： Mesoscience Electrocatalytic material design Hydrogen energy conversion Electrocatalysis

Single-atom alloying sprinkles magic over copper for exclusive CO_(2)conversion to pure formic acid

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Science China Chemistry 2022年第3期65卷 421-422页

作者： Zidong Wei The State key laboratory of Power Transmission equipment&System Security and new technology Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource UtilizationSchool of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China

CO_(2)electrolysis provides a promising solution to achieve carbon neutrality[1].With electric power from renewable energy,CO_(2)electrolysis brings considerable economic benefits by converting CO_(2)into diversified value-added chemicals,including CO,HCOOH,CH_(2),C_(2)H_(2),C_(2)H_(5)OH,and C_(3)H_(7)OH[2].Considering the profit of electrons per mole,HCOOH is one of the most desired products[3].

关键词： alloying copper desired