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Oxygen Electrocatalysis on Mixed-Metal Oxides/Oxyhydroxides:From Fundamentals to Membrane Electrolyzer Technology

Accounts of Materials Research 2021年第7期2卷 548-558页

作者： Raina A.Krivina Yingqing Ou Qiucheng Xu liam p.twight T.Nathan Stovall Shannon W.Boettcher Department of Chemistry and Biochemistry and the Oregon Center for Electrochemistry University of OregonEugeneOregon 97403United States College of Chemistry and Chemical Engineering Chongqing UniversityChongqingChina Department of Materials Science East China University of Science and TechnologyShanghaiChina

CONSpECTUS:Catalyzing the oxygen evolution reaction(OER)is important for key energy-storage technologies,particularly water electrolysis and photoelectrolysis for hydrogen fuel *** neutral-to-alkaline conditions,first-row transitionmetal oxides/(oxy)hydroxides are the fastest-known OER catalysts and have been the subject of intense study for the past *** to their high performance is the intentional or accidental addition of Fe to Ni/Co oxides that convert to layered(oxy)hydroxide structures during the *** the role that Fe plays in the catalysis and the molecular identity of the true“active site”has proved challenging,however,due to the dynamics of the host structure and absorbed Fe sites as well as the diversity of local structures in these disordered active *** this Account,we highlight our work to understand the role of Fe in Ni/Co(oxy)hydroxide OER *** first discuss how we characterize the intrinsic activity of the first-row transition-metal(oxy)hydroxide catalysts as thin films by accounting for the contributions of the catalyst-layer thickness(mass loading)and electrical conductivity as well as the underlying substrate’s chemical interactions with the catalyst and the presence of Fe species in the *** show how Fe-doped Ni/Co(oxy)hydroxides restructure during catalysis,absorb/desorb Fe,and in some cases degrade or regenerate their activity during electrochemical *** highlight the relevant techniques and procedures that allowed us to better understand the role of Fe in activating other first-row transition metals for *** find several modes of Fe incorporation in Ni/Co(oxy)hydroxides and show how those modes correlate with activity and *** also discuss how this understanding informs the incorporation of earthabundant transition-metal OER catalysts in anion-exchange-membrane water electrolyzers(AEMWE)that provide a locally basic anode environment but run on pure water and have advan

关键词： hydroxide catalyst catalysis

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