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A Direct Liquid Fuel Cell with High Power Density Using Reduced Phosphotungstic Acid as Redox Fuel

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Energy & Environmental Materials 2022年第1期5卷 278-284页

作者： Yiyang Liu Ting Feng shanfu lu Haining Wang Yan Xiang Beijing Key Laboratory of Bio-inspired Energy Materials and Devices School of Space and EnvironmentBeihang UniversityBeijing 100191China School of Energy and Power Engineering Beihang UniversityBeijing 100191China

Direct liquid fuel cells(DLFCs)are proposed to address the problems of high cost and complex storage and transportation of hydrogen in traditional hydrogen-oxygen proton exchange membrane fuel ***,present fuels of organic small molecules used in DLFCs are restricted to problems of sluggish electrochemical kinetics and easily poisoning of precious metal ***,we demonstrate reduced phosphotungstic acid as a liquid fuel for DLFCs based on its advantages of high chemical and electrochemical stability,high electrochemical activity on common carbon material electrodes,and low permeability through proton exchange *** application of phosphotungstic acid fuel effectively solves the problems of high cost of anode catalysts and serious fuel permeation loss in traditional DLFCs.A phosphotungstic acid fuel cell achieves a peak power density of466 mW cm^(-2)at a cell voltage of 0.42 V and good stability at current densities in the range from 20 to 200 mA cm^(-2).

关键词： direct liquid fuel cell heteropoly acid phosphotungstic acid power density renewable fuel

Advancement toward Polymer Electrolyte Membrane Fuel Cells at Elevated Temperatures

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Research 2020年第1期2020卷 1731-1745页

作者： Jin Zhang David Aili shanfu lu Qingfeng Li and San Ping Jiang Beijing Key Laboratory of Bio-Inspired Energy Materials and Devices&School of Space and Environment Beihang UniversityBeijing 100191China Department of Energy Conversion and Storage Technical University of DenmarkFysikvej 3102800 LyngbyDenmark Fuels and Energy Technology Institute&WA School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityWA6102PerthAustralia

Elevation of operational temperatures of polymer electrolyte membrane fuel cells(PEMFCs)has been demonstrated with phosphoric acid-doped polybenzimidazole(PA/PBI)*** technical perspective of the technology is simplified construction and operation with possible integration with,e.g.,methanol *** this target,significant efforts have been made to develop acid-base polymer membranes,inorganic proton conductors,and organic-inorganic composite *** report is devoted to updating the recent progress of the development particularly of acid-doped PBI,phosphate-based solid inorganic proton conductors,and their composite ***-term stability of PBI membranes has been well documented,however,at typical temperatures of 160℃.Inorganic proton-conducting materials,e.g.,alkali metal dihydrogen phosphates,heteropolyacids,tetravalent metal pyrophosphates,and phosphosilicates,exhibit significant proton conductivity at temperatures of up to 300℃ but have so far found limited applications in the form of thin *** membranes of PBI and phosphates,particularly in situ formed phosphosilicates in the polymer matrix,showed exceptionally stable conductivity at temperatures well above 200℃.Fuel cell tests at up to 260℃ are reported operational with good tolerance of up to 16%CO in hydrogen,fast kinetics for direct methanol oxidation,and feasibility of nonprecious metal *** prospect and future exploration of new proton conductors based on phosphate immobilization and fuel cell technologies at temperatures above 200℃ are discussed.

关键词： inorganic methanol composite

Polyoxometalate-based electrolyte materials in redox flow batteries:Current trends and emerging opportunities

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Materials Reports(Energy) 2022年第2期2卷 39-57页

作者： Yiyang Liu Jialin Zhang shanfu lu Yan Xiang Beijing Key Laboratory of Bio-inspired Energy Materials and Devices School of Space and EnvironmentBeihang UniversityBeijing100191PR China

Redox flow batteries have received wide attention for electrochemical energy conversion and storage devices due to their specific advantage of uncoupled power and energy devices,and therefore potentially to reduce the capital costs of energy *** structural features of polyoxometalates exhibit unique advantages in redox flow batteries,such as,stable chemical properties,multi-electron reaction,good redox reversibility,low permeability,etc,which furnishes a novel perspective for settling various problems of redox flow *** was a comprehensive and critical review of this type of batteries,focusing mainly on the chemistry of polyoxometalate electrolyte materials and introducing a systematic ***,challenges and perspectives of polyoxometalate electrolyte materials and polyoxometalate redox flow batteries are discussed.

关键词： Redox flow battery Electrolyte materials Polyoxometalate Electrolyte design

Effects of bicarbonate and cathode potential on hydrogen production in a biocathode electrolysis cell

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Frontiers of Environmental Science & Engineering 2014年第4期8卷 624-630页

作者： Dawei LIANG Yanyan LIU Sikan PENG Fei LAN shanfu lu Yan XIANG Key Laboratory of Bio-lnspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry & Environment Beihang University Beijing 100191 China Beijing Key Laboratory for Advanced Functional Materials and Thin Fihn Technology Beihang University Beijing 100191 China

A biocathode with microbial catalyst in place of a noble metal was successfully developed for hydrogen evolution in a microbial electrolysis cell （MEC）. The strategy for fast biocathode cultivation was demonstrated. An exoelectrogenic reaction was initially extended with an H2-full atmosphere to enrich Ha-utilizing bacteria in a MEC bioanode. This bioanode was then inversely polarized with an applied voltage in a half-cell to enrich the hydrogen-evolving biocathode. The electrocatalytic hydrogen evolution reaction （HER） kinetics of the biocathode MEC could be enhanced by increasing the bicarbonate buffer concentration from 0.05 mol·L-1 to 0.5 mol· L-1 and/or by decreasing the cathode potential from -0.9 V to - 1.3 V vs. a saturated calomel electrode （SCE）. Within the tested potential region in this study, the HER rate of the biocathode MEC was primarily influenced by the microbial catalytic capability. In addition, increasing bicarbonate concentration enhances the electric migration rate of proton carriers. As a consequence, more mass H＋ can be released to accelerate the biocathode-catalyzed HER rate. A hydrogen production rate of 8.44 m3. m 3. d1 with a current density of 951.6 A. m-3 was obtained using the biocathode MEC under a cathode potential of - 1.3 V vs. SCE and 0.4 mol· L-1 bicarbonate. This study provided information on the optimization of hydrogen production in biocathode MEC and expanded the practical applications thereof.

关键词： microbial electrolysis cell (MEC) biocathode hydrogen production bicarbonate cathode potential

High-entropy L1_(2)-Pt(FeCoNiCuZn)_(3) intermetallics for ultrastable oxygen reduction reaction

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Journal of Energy Chemistry 2023年第11期86卷 158-166,I0004页

作者： Qian Zhang Tao Shen Min Song Shuang Wang Jialin Zhang Xiao Huang shanfu lu Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Beijing Key Laboratory of Bio-inspired Energy Materials and Devices School of Space and EnvironmentBeihang UniversityBeijing 100191China

Enhancing the stability of Pt-based electrocatalysts for the sluggish cathodic oxygen reduction reaction(ORR)is critical for proton exchange membrane fuel cells(PEMFCs).Herein,high-entropy intermetallic(HEI)L1_(2)-Pt(FeCoNiCuZn)3is designed for durable ORR *** from the unique HEI structure and the enhanced intermetallic phase stability,Pt(FeCoNiCuZn)3/C nanoparticles demonstrate significantly improved stability over Pt/C and PtCu_(3)/C *** Pt(FeCoNiCuZn)3/C exhibits a negligible decay of the half-wave potential during 30,000 potential cycles from 0.6 to 1.0 V,whereas Pt/C and PtCu_(3)/C are negatively shifted by 46 and 36 m V,*** after 10,000 cycles at potential up to 1.5 V,the mass activity of Pt(FeCoNiCuZn)3/C still shows~70%*** evidenced by the structural characterizations,the HEI structure of Pt(FeCoNiCuZn)3/C is well maintained,while PtCu_(3)/C nanoparticles undergo severe Cu leaching and particle *** addition,when assembled Pt(FeCoNiCuZn)3/C as the cathode in high-temperature PEMFC of 160℃,the H_(2)-O_(2)fuel cell delivers almost no degradation even after operating for 150 h,demonstrating the potential for fuel cell *** work provides a facile design strategy for the development of high-performance ultrastable electrocatalysts.

关键词： High-entropy intermetallics Pt-based electrocatalysts Oxygen reduction reaction High stability

Silica-facilitated proton transfer for high-temperature proton-exchange membrane fuel cells

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Science China Chemistry 2021年第12期64卷 2203-2211页

作者： Gen Huang Yingying Li Shiqian Du Yujie Wu Ru Chen Jin Zhang Yi Cheng shanfu lu Li Tao Shuangyin Wang State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical Engineeringthe National Supercomputer Centers in ChangshaAdvanced Catalytic Engineering Research Center of the Ministry of EducationHunan UniversityChangsha410082China Department of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha410083China Beijing Key Laboratory of Bio-inspired Energy Materials and Devices School of Space and EnvironmentBeihang UniversityBeijing100191China

High-temperature proton-exchange membrane fuel cells(HT-PEMFCs)have shown a broad prospect of applications due to the enhanced reaction kinetics and simplified supporting ***,the proton conductor,phosphoric acid,tends to poison the active sites of Pt,resulting in high Pt ***,Pt nanoparticles anchored on SiO_(2)-modified carbon nanotubes(CNT@SiO_(2)-Pt)are prepared as high-performance cathode catalysts for *** SiO_(2)in CNT@SiO_(2)-Pt can induce the adsorption of phosphoric acid transferring from Pt active sites in the catalytic layer,avoiding the poisoning of the Pt,and the phosphate fixed by SiO_(2)provide a high-speed proton conduction highway for oxygen reduction ***,The CNT@SiO_(2)-Pt cathode achieve superior power density of 765 mW cm^(−2)(160℃)and 1,061 mW cm^(−2)(220℃)due to the rapid proton-coupled electron process and outstanding stability in *** result provides a new road to resolve the phosphate poisoning for the commercialization of HT-PEMFCs.

关键词： high-temperature proton exchange membrane fuel cell electrocatalyst proton transfer silica phosphoric acid

Elucidating the electro-catalytic oxidation of hydrazine over carbon nanotube-based transition metal single atom catalysts

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Nano Research 2021年第12期14卷 4650-4657页

作者： Jin Zhang Yaxin Wang Chujie Yang Sian Chen Zhengjian Li Yi Cheng Haining Wang Yan Xiang shanfu lu Shuangyin Wang Beijing Key Laboratory of Bio-inspired Energy Materials and Devices&School of Space and Environment Beihang UniversityBeijing100191China Department of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha410083China State Key Laboratory of Chem/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China

Elucidating the reaction mechanism of hydrazine oxidation reaction(HzOR)over carbon-based catalysts is highly propitious for the rational design of novel electrocatalysts for *** present work,isolated first-row transition metal atoms have been coordinated with N atoms on the graphite layers of carbon nanotubes via a M-N_(4)-C configuration(MSA/CNT,M=Fe,Co and Ni).The HzOR over the three single atom catalysts follows a predominant 4-electron reaction pathway to emit N_(2) and a negligible 1-electron pathway to emit trace of NH3,while their electrocatalytic activity for HzOR is dominated by the absorption energy of N2H4 on ***,FeSA/CNT reverses the passivation effect on Fe/C and shows superior performance than CoSA/CNT and NiSA/CNT with a recorded high mass activity for HzOR due to the higher electronic charge of Fe over Co and Ni in the M-N_(4)-C configuration and the lowest absorption energy of N_(2)H_(4) on FeSA/CNT among the three MSA/CNT catalysts.

关键词： hydrazine oxidation single atom catalyst transition metals differential electrochemical mass spectroscopy direct hydrazine fuel cell

聚乙烯吡咯烷酮基碘凝胶电解质的制备及在染料敏化太阳能电池中的应用

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高等学校化学学报 2014年第6期35卷 1293-1299页

作者：卢善富刘祎阳相艳北京航空航天大学化学与环境学院仿生能源与器件北京市重点实验室北京100191

采用聚乙烯吡咯烷酮(PVP)和聚偏氟乙烯(PVDF)为凝胶剂,以碘化锂和碘单质为碘源,碳酸乙烯酯(EC)和碳酸丙烯酯(PC)为溶剂,制备了染料敏化太阳能电池(DSSCs)用凝胶聚合物电解质(GPE).使用拉曼光谱、循环伏安曲线和交流阻抗谱等对GPE进行表... 详细信息

采用聚乙烯吡咯烷酮(PVP)和聚偏氟乙烯(PVDF)为凝胶剂,以碘化锂和碘单质为碘源,碳酸乙烯酯(EC)和碳酸丙烯酯(PC)为溶剂,制备了染料敏化太阳能电池(DSSCs)用凝胶聚合物电解质(GPE).使用拉曼光谱、循环伏安曲线和交流阻抗谱等对GPE进行表征.结果表明,聚合物的配比与浓度及碘与碘化锂比例对该电解质性能有很大影响,当聚合物质量分数为10%、PVP与PVDF质量比为80∶20、I2浓度为0.042mol/L且LiI与I2摩尔比为30∶1时,制备的GPE在室温下电导率达最大值(3.27 mS/cm).使用该GPE组装的DSSCs在100 mW/cm2的模拟太阳光照射下,开路电压为0.64 V,短路电流为13.6 mA/cm2,填充因子为0.595,能量转化效率为5.18%,并在30 d内表现出了良好的稳定工作性能.

关键词：聚乙烯吡咯烷酮凝胶聚合物电解质离子电导率染料敏化太阳能电池

Honeycomblike Porous Carbon Derived from Lotus stems for Supercapacitors and Capacitive Deionization

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Honeycomblike Porous Carbon Derived from Lotus stems for Sup...