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Analysis of routes for electrochemical conversion of CO_(2) to methanol

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Clean Energy 2022年第1期6卷 202-210页

作者： Pingping Li Siqi Gong Chufu Li and Zhien Liu National Institute of Clean and low carbon Energy Beijing102209P.R.China

In the context of peak carbon and carbon neutrality,the utilization of CO_(2)has attracted attention with the aim of reducing carbon emissions by converting CO_(2)into high-value chemicals or ***(MeOH),which is both a hydrogen and a carbon carrier,is considered the most promising among the CO_(2)-conversion *** paper focus on routes for electrochemical conversion of CO_(2)to MeOH using green power and green hydrogen to achieve negative CO_(2)*** feasible technical routes for electrochemical conversion of CO_(2)to MeOH are proposed in this paper:Route 1,electrolysis of water to H_(2)and hydrogenation of CO_(2)to MeOH;Route 2,electrochemical reduction of CO_(2)to MeOH;and Route 3,co-electrolysis of CO_(2)-H_(2)O to syngas and synthesis of MeOH from ***-economic assessments of the three routes are conducted using technical maturity surveys,system simulations and cost analyses to provide reference data for route selection for CO_(2)conversion to MeOH in *** with the other routes,Route 1 is advantageous in terms of technical maturity and commercial application *** Route 1 is presently economically unviable,it is expected to achieve profitability and commercial application in the future with decreases in the cost of renewable power and continuous development of water-electrolysis technology.

关键词： CO_(2) electrolysis hydrogenation carbon capture and utilization methanol electrochemical conversion carbon neutrality

A simple electrochemical method for conversion of Pt wires to Pt concave icosahedra and nanocubes on carbon paper for electrocatalytic hydrogen evolution

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Science China Materials 2019年第1期62卷 115-121页

作者： Zhimin Luo Chaoliang Tan Zhuangchai Lai Xiao Zhang Junze Chen Ye Chen Bo Chen Yue Gong Zhicheng Zhang Xuejun Wu Bing Li Yun Zong Lin Gu Hua Zhang Center for Programmable Materials School of Materials Science and Engineering Nanyang Technological University Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Institute of Materials Research and Engineering A*STAR (Agency for Science Technology and Research)

In the controlled synthesis of noble metal nanostructures using wet-chemical methods, normally, metal salts/complexes are used as precursors, and surfactants/ligands are used to tune/stabilize the morphology of nanostructures. Here, we develop a facile electrochemical method to directly convert Pt wires to Pt concave icosahedra and nanocubes on carbon paper through the linear sweep voltammetry in a classic three-electrode electrochemical cell. The Pt wire, carbon paper and Ag/AgCl(3 mol L-1 KCl) are used as the counter, working and reference electrodes, ***, the formed Pt nanostructures exhibit better electrocatalytic activity towards the hydrogen evolution compared to the commercial Pt/C catalyst. This work provides a simple and effective way for direct conversion of Pt wires into well-defined Pt nanocrystals with clean surface. We believe it can also be used for preparation of other metal nanocrystals,such as Au and Pd, from their bulk materials, which could exhibit various promising applications.

关键词： noble metals electrochemical conversion concave nanostructures electrocatalysis hydrogen evolution

Low-temperature graphitization of lignin via Co-assisted electrolysis in molten salt

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Green Energy & Environment 2024年第9期9卷 1449-1458页

作者： Shijie Li Wei-Li Song Xue Han Qingqing Cui Yan-li Zhu Shuqiang Jiao Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081China

The ever-growing energy demand and environmental issues have stimulated the development of sustainable energy ***,an efficient and environmentally friendly electrochemical transformation technology was proposed to prepare highly graphitized carbon materials from an abundant natural resource-lignin (LG).The preparation process mainly includes pyrolytic carbonization of raw LG material and electrochemical conversion of amorphous carbon ***,with the assistance of Co catalyst,the graphitization degree of the products was significantly improved,in which the mechanism was the removal of heteroatoms in LG and the rearrangement of carbon atoms into graphite ***,tunable microstructures (nanoflakes) under catalytic effects could also be observed by controlling the electrolytic *** with the products CN1 (without catalyst) and CN5 (with 10%catalyst),the specific surface area are 158.957 and 202.246 m^(2)g^(-1),*** used as the electrode material for lithium-ion batteries,CN5 delivered a competitive specific capacity of~350 m Ah g^(-1)(0.5 C) compared with commercial *** strategy proposed in this work provides an effective way to extract value-added graphite materials from lignin and can be extended to the graphitization conversion of any other amorphous carbon precursor materials.

关键词： Lignin Graphitic carbon electrochemical conversion Lithium-ion batteries

High-value utilization of CO_(2) to synthesize sulfur-doped carbon nanofibers with excellent capacitive performance

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1666-1677页

作者： Meng-jun Hu Ming-zhu Yin Li-wen Hu Peng-jie Liu Shuo Wang Jian-bang Ge College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China Nuclear Engineering Program Department of Mechanical EngineeringVirginia Polytechnic Institute and State UniversityBlacksburgVirginia 24061USA

Carbon nanofiber(CNF)is considered a promising material due to its excellent physical and chemical *** paper proposes a novel way to transform CO_(2) into heteroatom-doped CNFs,with the introduction of Fe,Co,and Ni as *** the electrolyte containing Ni O,Co2O3,and Fe_(2)O_(3) was employed,sulfur-doped CNFs in various diameters were *** the introduction of Fe catalyst,the obtained sulfur-doped CNFs showed the smallest and tightest diameter *** obtained sulfur-doped CNFs had high gravimetric capacitance(achieved by SDG-Fe)that could reach 348.5 F/g at 0.5 A/g,excellent cycling stability,and good rate *** comparison purposes,both Fe and nickel cathodes were tested,where the active metal atom at their surface could act as *** these two situations,sulfur-doped graphite sheet and sulfur-doped graphite quasi-sphere were the main products.

关键词： carbon dioxide capture electrochemical conversion carbon fiber molten salt

The capacitive performances of carbon obtained from the electrolysis of CO_(2) in molten carbonates: Effects of electrolysis voltage and temperature

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Journal of Energy Chemistry 2020年第12期29卷 418-424页

作者： Diyong Tang Yanpeng Dou Huayi Yin Xuhui Mao Wei Xiao Dihua Wang School of Resource and Environmental Sciences International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei ProvinceWuhan UniversityWuhan 430072HubeiChina

The electrochemical reduction of CO2 to capacitive carbon in molten Li2 CO3–Na2 CO3–K2 CO3 is an effective strategy for capturing and utilizing CO2. This paper reports the effects of the cell voltages and operating temperatures(450–650 °C) of the molten salt electrolysis on the capacitive performance of electrolytic carbon. The electrolytic carbon delivers excellent specific capacitance when the cell voltage is 4.5 V and the temperature of molten salt is 450 °C. The carbon obtained at 450 °C and under 4.5 V delivers a specific capacitance of 550 F g^(-1) at 0.2 A g^(-1) in 1 M aqueous H2 SO4, and the capacity retention rate is73% after 10000 cycles. The specific capacitance of the electrolytic carbon increases as the electrolysis temperature decreases, and the optimal cell voltage is 4.5 V.

关键词： Carbon dioxide electrochemical conversion Molten carbonates Carbon Supercapacitor

Technical Perspective of Carbon Capture,Utilization,and Storage

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Engineering 2022年第7期8卷 27-32页

作者： Qingyang Lin Xiao Zhang Tao Wang Chenghang Zheng Xiang Gao State Key Laboratory of Clean Energy Utilization State Environmental Protection Engineering Center for Coal-Fired Air Pollution ControlZhejiang UniversityHangzhou 310027China

Carbon dioxide(CO_(2))is the primary greenhouse gas contributing to anthropogenic climate change which is associated with human *** majority of CO_(2) emissions are results of the burning of fossil fuels for energy,as well as industrial processes such as steel and cement *** capture,utilization,and storage(CCUS)is a sustainable technology promising in terms of reducing CO_(2) emissions that would otherwise contribute to climate *** this perspective,the discussion on carbon capture focuses on chemical absorption technology,primarily due to its commercialization *** CO_(2) absorptive capacity and absorption rate of various chemical solvents have been *** carbon utilization focuses on electrochemical conversion routes converting CO_(2) into potentially valuable chemicals which have received particular attention in recent *** Faradaic conversion efficiencies for various CO_(2) reduction products are used to describe efficiency *** carbon storage,successful deployment relies on a better understanding of fluid mechanics,geomechanics,and reactive transport,which are discussed in details.

关键词： CCUS Carbon capture Carbon utilization Carbon storage Chemical absorption electrochemical conversion Storage mechanism

Enhanced electrochemical CO₂ reduction coupled with urea oxidation using bifunctional atomically dispersed CuNi catalysts

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Nano Research 2024年第1期18卷 208-216页

作者： Wenjie Wu Haoyang Zhou Ying Liu Yifei Pan Qingqing Chen Yu Zhang Junjie Mao Wenjie Ma Ping Yu 1Beijing National Laboratory for Molecular Sciences Key Laboratory of Analytical Chemistry for Living Biosystems Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 China 3University of Chinese Academy of Sciences Beijing 100049 China 2College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 China

The electrochemical conversion of carbon dioxide (CO2) into chemical fuels represents a promising approach for addressing global carbon balance issues. However, this process is hindered by the kinetic limitations of anodic reactions, usually the oxygen evolution reaction, resulting in less efficient production of high value-added products. Here, we report an integrated electrocatalytic system that couples CO2 reduction reaction (CO2RR) with urea oxidation reaction (UOR) using a bifunctional electrocatalyst with atomically dispersed dual-metal CuNi sites anchored on bamboo-like nitrogen-doped carbon nanotubes (CuNi-CNT), which were synthesized through a one-step pyrolysis process. The bifunctional CuNi-CNT catalyst exhibits a near 100% CO Faraday efficiency for CO2RR over a wide potential range and outstanding UOR performance with a negatively shifted potential of 210 mV at 10 mA·cm−2. In addition, we assemble a two-electrode electrolyzer using bifunctional CuNi-CNT-modified carbon fiber paper electrodes as both cathode and anode, capable of operating at a remarkably low cell voltage of 1.81 V at 10 mA·cm−2, significantly lower than conventional setups. The study provides a novel avenue to achieving an efficient carbon cycle with reduced electric power consumption.

关键词： electrochemical conversion bimetallic site catalyst bifunctional electrocatalyst carbon dioxide reduction urea oxidation