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Ni(OH)_2-Ni/C for hydrogen oxidation reaction in alkaline media

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Journal of Energy Chemistry 2019年第2期28卷 111-115页

作者： Yangxin Pan Gaohe Hu juntao lu Li Xiao Lin Zhuang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan University

The development of the hydrogen electrode is vital for the application of alkaline polymer electrolyte fuel cells(APEFCs).In this study,a series of Ni(OH)_2 decorated Ni/C catalysts(Ni(OH)_2-Ni/C) were prepared by a three-step electrochemical treatment of Ni/*** existence of Ni(OH)_2 was demonstrated by X-ray photoelectron spectroscopy(XPS),and the surface molar ratio of Ni(OH)_2/Ni of the samples was estimated via an electrochemical *** HOR catalytic activity of the catalysts was evaluated by a rotation disk electrode(RDE) method,and a "volcano plot" was established between the HOR exchange current(j0) and the surface molar ratio of Ni(OH)_2/*** top of the "volcano",the surface molar ratio of Ni(OH)_2/Ni is1.1:1,the j0 of which was 6.8 times of that of Ni/*** stability of the samples toward HOR was evaluated to be *** study added a systematic experimental evidence to the HOR research,showing that the HOR catalytic activity of Ni can be deliberately controlled via decoration of Ni(OH)_2,which may help understanding the HOR mechanism on Ni.

关键词： Hydrogen oxidation reaction Fuel cells Alkaline polymer electrolyte fuel cells Nickel Volcano plot

Regulation of the activity,selectivity,and durability of Cu-based electrocatalysts for CO_(2) reduction

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Science China Chemistry 2021年第10期64卷 1660-1678页

作者： Chang Liu Jun Gong Zeyu Gao Li Xiao Gongwei Wang juntao lu Lin Zhuang College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power SourcesWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhan 430072China

CO_(2)electroreduction offers a promising approach to alleviate global warming and reduce petroleum consumption simultaneously,due to its capability to convert the greenhouse gas CO_(2)to valuable fuels and chemicals by using renewable *** has an essential impact on the CO_(2)electroreduction *** the diverse exploited materials,Cu is the only monometallic electrocatalyst that can produce CO and ***,its activity,selectivity,and durability are not satisfactory for practical ***,we make a comprehensive survey of the recent progress in enhancing Cu-based electrocatalysts with the strategies such as oxidation pre-treatment,heteroatom doping,morphological control,and surface *** review provides an overview of the current status and future opportunities for Cu-catalyzed CO_(2)*** may contribute to the rational design of Cu-based electrocatalysts with improved performance and thus advance practical CO_(2)electrolyzer development.

关键词： CO_(2)electroreduction Cu-based catalysts activity selectivity durability

Improving the Catalytic Efficiency of NiFe-LDH/ATO by Air Plasma Treatment for Oxygen Evolution Reaction

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Chemical Research in Chinese Universities 2021年第2期37卷 293-297页

作者： LEI Chong LI Wenzheng WANG Gongwei ZHUANG Lin lu juntao XIAO Li College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power SourcesWuhan UniversityWuhan430072P.R.China Institute for Advanced Studies Wuhan UniversityWuhan430072P.R.China

Developing efficient catalysts toward the oxygen evolution reaction(OER)is important for water splitting and rechargeable metal-air *** NiFe oxides are considered as potentially applicable catalysts in the alkaline media,there are still a limited numbers of researches working on membrane electrode assembly(MEA)fed with pure water due to their poor electrical *** this work,antimony doped tin oxide(ATO)has been employed as conductive supports where NiFe layered double hydroxide uniformly dispersed[named NiFe-LDH(layered double hydroxide)/ATO].The catalysts have been synthesized by a one-step co-precipitation method,and then NiFe-LDH/ATO-air plasma was obtained through mild air plasma *** to XPS analysis,binding energies of Ni2p and Fe2p were shifted ***,a new signal of low oxygen coordination appeared on O1s spectrum after air plasma *** XPS results indicated that oxygen vacancies(Ov)were generated after air plasma *** measurement indicated that the vacancy-rich NiFe-LDH/ATO-air plasma exhibited better performance than NiFe-LDH/ATO not only in 1 mol/L KOH solutions but also in an alkaline polymer electrolyte water electrolyzer(APEWE)fed with deionized *** work provides a feasible way to design practical catalysts used in electrochemical energy conversion systems by choosing corrosion resistance supports and defect engineering.

关键词： Antimony doped tin oxide(ATO) Air plasma Oxygen vacancy Alkaline polymer electrolyte water electrolyzer(APEWE)

A novel on-line electrochemical transmission infrared spectroscopy to study the current efficiency of carbonates for ethanol oxidation reactions in alkaline media

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Journal of Energy Chemistry 2019年第11期28卷 78-83页

作者： Wei Peng Li Xiao juntao lu Lin Zhuang Hubei Key Lab of Electrochemical Power Sources College of Chemistry and Molecular Sciences Wuhan University

Research on the reaction mechanism of ethanol oxidation reaction(EOR) is important for the development of highly active EOR electro-catalysts. One of the main difficulties in the EOR study is the quantitative analysis of the non-volatile products. Conventional on-line electrochemical flowing transmission infrared spectroscopy(ETIRS) can only collect a part of the carbonate products of EOR in alkaline media, making the further quantitative study impossible. Herein, a new ETIRS system has been designed and prepared by employing a cation-exchange membrane(Nafion) in the sampling hood. The using of the Nafion membrane can prevent the anions crossing over by confining the generated carbonates in the sampling hood without diffusing into the bulk electrolyte. Therefore, the collection efficiency of the carbonate products as well as the test accuracy of the carbonate current efficiency has been significantly improved. The result of CO stripping reaction shows that ca. 100% of the carbonate product is able to be collected in alkaline media by this new system. The influence of the experimental temperature to the carbonate current efficiency has been further studied on Pt/C toward EOR in alkaline media.

关键词： Ethanol oxidation reaction Transmission infrared spectroscopy Platinum Alkaline media

Water induced phase segregation in hydrocarbon proton exchange membranes

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Journal of Energy Chemistry 2018年第6期27卷 1517-1520页

作者： Kangjie Lyu Yanqiu Peng Li Xiao juntao lu Lin Zhuang College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power Sources Wuhan University Wuhan 430072 Hubei China Institute for Advanced Studies Wuhan University Wuhan 430072 Hubei China

Proton exchange membranes （PEMs） are a key material for proton exchange membrane fuel cells （PEM-FCs）, Non-fluorinated hydrocarbon PEMs are low-cost alternatives to Nation, but limited by the low pro-ton conductivity, because of the weak phase segregation structure and narrow ion-transport *** efforts have been taken to improve the performance of hydrocarbon PEMs, but mostly with com-plex methodologies. Here we demonstrate a simple, yet very efficient method to create phase segrega-tion structure inside a typical hydrocarbon PEM, sulfonated poly（ether ether ketone）（SPEEK）. By sim-ply adding appropriate amounts of water into the DMF solvent, the resulting SPEEK membrane exhibitswidened ion-transport channels, with the phase size of 2.7 nm, as indicated by both molecular dynamic（MD） simulations and transmission electron microscope （TEM） observations, and the proton conductivityis thus improved by 200%. These findings not only further our fundamental understanding of hydrocarbonPEMs, but are also valuable to the development of low-cost and practical fuel cell technologies.

关键词： Proton exchange membrane Phase segregation Proton conductivity Molecular dynamics simulation Sulfonated poly(ether ether ketonel

Intermetallic Pt_2Si:magnetron-sputtering preparation and electrocatalysis toward ethanol oxidation

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Journal of Energy Chemistry 2014年第3期23卷 265-268页

作者： Zhong Ren Li Xiao Gongwei Wang juntao lu Lin Zhuang College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power SourcesWuhan University

Although most transition metals have been tested as the promoter to Pt for electrocatalysis toward fuel cell reactions,semi-conductor elements,such as Si,have hitherto not been *** we report a simple synthesis of intermetallic Pt2Si electrode using magnetron sputtering and the electrocatalysis toward ethanol oxidation reaction（EOR）.In comparison to Pt,the intermetallic Pt2Si surface turns out to be much more active in catalyzing the EOR：the onset potential shifts negatively by 150 mV,and the current density at 0.6 V increases by a magnitude of one *** an enormous enhancement in EOR catalysis is ascribed to the promotion effects of Si,which can not only provide active surface oxygenated species to accelerate the removal of COads,but also strongly alter the electronic property of Pt,as clearly indicated by the core-level shift in XPS spectrum.

关键词： Pt2Si intermetallic compound magnetron sputtering electrocatalysis ethanol oxidation

Highly efficient Fe/N/C catalyst using adenosine as C/N-source for APEFC

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Journal of Energy Chemistry 2017年第4期26卷 616-621页

作者： Huan Ren Ying Wang Xun Tang juntao lu Li Xiao Lin Zhuang College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power SourcesWuhan UniversityWuhan 430072HubeiChina

An environmentally friendly precursor, adenosine, has been used as a dual source of C and N to synthesize nitrogen-doped carbon catalyst with/without Fe. A hydrothermal carbonization method has been used and water is the carbonization media. The morphology of samples with/without Fe component has been compared by HRTEM, and the result shows that Fe can promote the graphitization of carbon. Further electro-chemical test shows that the oxygen reduction reaction（ORR） catalytic activity of Fe-containing sample（C–Fe N） is much higher than that of the Fe-free sample（C–N）. Additionally, the intermediates of C–Fe N formed during each synthetic procedure have been thoroughly characterized by multiple methods,and the function of each procedure has been discussed. The C–Fe N sample exhibits high electro-catalytic stability and superior electro-catalytic activity toward ORR in alkaline media, with its half-wave potential 20 mV lower than that of commercial Pt/C（40 wt%）. It is further incorporated into alkaline polymer electrolyte fuel cell（APEFC） as the cathode material and led to a power density of 100 m W/cm;.

关键词： N-doped carbon catalyst ORR Fuel cell Alkaline polymer electrolyte Fe/N/C

Analysis of The Value of Multi-Slice Spiral CT and Magnetic Resonance Imaging in The Diagnosis of Carpal Joint Injury

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Journal of Clinical and Nursing Research 2024年第5期8卷 145-149页

作者： Rongfeng An juntao lu Jingzhong Liu Fang Yan Chinese People’s Liberation Army Joint Logistics Force 944th Hospital Jiuquan 735000Gansu ProvinceChina

Objective:To analyze the value of multi-slice spiral computed tomography(CT)and magnetic resonance imaging(MRI)in the diagnosis of carpal joint ***:A total of 130 patients with suspected wrist injuries admitted to the Department of Orthopedics of our hospital from January 2023 to January 2024 were selected and randomly divided into a single group(n=65)and a joint group(n=65).The single group was diagnosed using multi-slice spiral CT,and the joint group was diagnosed using multi-slice spiral CT and magnetic resonance imaging,with pathological diagnosis as the gold *** diagnostic results of both groups were compared to the gold standard,and the diagnostic energy efficiency of both groups was ***:The diagnostic results of the single group compared with the gold standard were significant(P0.05).The sensitivity and accuracy of diagnosis in the joint group were significantly higher than that in the single group(P0.05).Conclusion:The combination of multi-slice spiral CT and MRI was highly accurate in diagnosing wrist injuries,and the misdiagnosis rate and leakage rate were relatively ***,this diagnostic program is recommended to be popularized.

关键词： Multi-slice CT Magnetic resonance imaging Carpal joint injury Joint diagnosis

Stationary phase point extraction based on high-resolution radon transform and its application to multiple attenuation by wavefield extrapolation

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Global Geology 2017年第2期20卷 98-105页

作者： LI Aoqi WANG Deli lu juntao LIU Chengming WANG Tong College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China

Multiple prediction and subtraction techniques based on wavefield extrapolation are effective for suppressing multiple related to water layers. In the conventional wavefield extrapolation method,the multiples of the seismic data are predicted from the known total wave field by the Green function convoluted with each point of the bottom. However,only the energy near the stationary phase point has an effect on the summation result when the convolutional gathers are added. The research proposed a stationary phase point extraction method based on high-resolution radon transform. In the radon domain,the energy near the stationary phase point is directly added along the convolutional gathers curve,which is a valid solution to the problem of the unstable phase of the events of multiple. The Curvelet matching subtraction technique is used to remove the multiple,which improved the accuracy of the multiple predicted by the wavefield extrapolation and the artifacts appearing around the events of multiple are well eliminated. The validity and feasibility of the proposed method are verified by the theoretical and practical data example.

关键词： high-resolution radon transform multiple wavefield extrapolation stationary phase point