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2011 International Conference on Advanced Materials and Computer Science(ICAMCS 2011)

作者： H.Y.Luan Y.F.Fan S.Y.Zhang Institute of Road and Bridge Engineering Dalian Maritime University

Concrete deteriorated severely in the acid deposit environment. To discover the damage mechanism of the material, changes of microstructure of concrete samples exposed to the acidic solution were executed. A batch of cubic concrete samples with the dimension of 10×10×10mm was prepared. acidic solution with p H level of 2.5 was deposed by the mixture of sulfuric and nitric acid solution in the laboratory. Mercury intrusion test, SEM/EDS analyses were performed on the samples exposed to the acidic solution for a certain periods. Pore structure and porosity ratio of the concrete samples were obtained. Microstructure, chemical compounds, elemental distribution in the samples exposed to the acidic solution for various periods are achieved. Development of the micro characteristics of concrete with exposure time is discussed.

关键词： microstructure concrete acidic solution porosity SEM/EDS

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Recent progress of advanced manganese oxide-based materials for acidic oxygen evolution reaction: Fundamentals, performance optimization,and prospects

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Journal of Energy Chemistry 2023年第3期78卷 537-553,I0015页

作者： Mengwei Guo Rongrong Deng Chaowu Wang Qibo Zhang Key Laboratory of Ionic Liquids Metallurgy Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093YunnanChina State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province Kunming 650093YunnanChina

The oxygen evolution reaction(OER) is the basis of various sustainable energy conversion and storage techniques,especially hydrogen production by water *** realize the practical application of hydrogen energy and mass-scale hydrogen production via water electrolysis,several obstacles,such as the multi-electron transfer OER process with sluggish kinetics and overall high reaction barrier,should be *** oxide-based(MnOx) materials,especially MnO_(2),have emerged as promising non-noble electrocatalysts for water electro-oxidation under acidic conditions due to their wellbalanced properties between catalytic activity and *** review introduces the fundamental understanding of the catalytic OER process on MnOx-based materials,including the conventional adsorbate evolution mechanism(AEM) and emerging lattice oxygen oxidation mechanism(LOM).The rational screening and prediction of MnOx-based catalysts that can stably catalyze OER in acid are summarized based on Pourbaix diagram analysis and thermodynamic density functional theory(DFT) ***,the up-to-date progress of upgrading the OER catalytic performance of MnOx-based catalysts by composite construction is ***,feasible strategies to improve the electrocatalytic activity and lifetime of MnOx-based catalysts are systemically discussed in terms of crystal structure control,reasonable setting of working potential and electrolyte environment,optimal selection of acid-stable conductive supports,and self-healing ***,future scientific challenges and research directions are outlined to guide the construction of advanced MnOx-based electrocatalysts for OER in acid.

关键词： Manganese oxide-based materials Manganese dioxides Electrocatalysts Oxygen evolution reaction acidic solution

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Electrochemical Study on Hydrogen Evolution and CO2 Reduction on Pt Electrode in Acid solutions with Different pH

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Chinese Journal of Chemical Physics 2018年第5期31卷 626-634,735页

作者： Jing Yang Jie Wei Wei Chen Yan-xia Chen Hefei National Laboratory for Physical Science at the Microscale and Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China

Hydrogen evolution reaction(HER)is the major cathodic reaction which competes CO2 reduction reaction(CO2 RR)on Pt *** level understanding on how these two reactions interact with each other and what the key factors are of CO2 RR kinetics and selectivity will be of great help in optimizing electrolysers for CO2 *** this work,we report our results of hydrogen evolution and CO2 reduction on Pt(111)and Pt film electrodes in CO2 saturated acid solution by cyclic voltammetry and infrared *** solution with pH>2,the major process is HER and the interfacial pH increases abruptly during HER;COad is the only adsorbed intermediate detected in CO2 reduction by infrared spectroscopy;the rate for COad formation increases with the coverage of UPD-H and reaches maximum at the onset potential for HER;the decrease of COad formation under HER is attributed to the available limited sites and the limited residence time for the reduction intermediate(Had),which is necessary for CO2 adsorption and reduction.

关键词： Hydrogen evolution reaction CO2 Reduction Pt(111) acidic solution pH effect Infrared spectroscopy

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