An aqueous preoxidation method for monolithic perovskite electrocatalysts with enhanced water oxidation performance

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dc.contributor.authorLi, B.-Q.
dc.contributor.authorTang, C.
dc.contributor.authorWang, H.-F.
dc.contributor.authorZhu, X.-L.
dc.contributor.authorZhang, Q.
dc.date.issued2016
dc.description.abstractPerovskite oxides with poor conductivity call for three-dimensional (3D) conductive scaffolds to demonstrate their superb reactivities for oxygen evolution reaction (OER). However, perovskite formation usually requires high-temperature annealing at 600° to 900°C in air, under which most of the used conductive frameworks (for example, carbon and metal current collectors) are reductive and cannot survive. We propose a preoxidization coupled electrodeposition strategy in which Co2+ is preoxidized to Co3+ through cobalt Fenton reaction in aqueous solution, whereas the reductive nickel framework is well maintained during the sequential annealing under nonoxidative atmosphere. The in situ–generated Co3+ is inherited into oxidized perovskites deposited on 3D nickel foam, rendering the monolithic perovskite electrocatalysts with extraordinary OER performance with an ultralow overpotential of 350 mV required for 10 mA cm−2 , a very small Tafel slope of 59 mV dec−1 , and superb stability in 0.10 M KOH. Therefore, we inaugurate a unique strategy for in situ hybridization of oxidative active phase with reductive framework, affording superb reactivity of perovskite electrocatalyst for efficient water oxidation.
dc.description.statementofresponsibilityBo-Quan Li, Cheng Tang, Hao-Fan Wang, Xiao-Lin Zhu, Qiang Zhang
dc.identifier.citationScience Advances, 2016; 2(10):1-6
dc.identifier.doi10.1126/sciadv.1600495
dc.identifier.issn2375-2548
dc.identifier.issn2375-2548
dc.identifier.orcidTang, C. [0000-0002-5167-1192]
dc.identifier.urihttp://hdl.handle.net/2440/129647
dc.language.isoen
dc.publisherAmerican Association for the Advancement of Science
dc.rights2016 © The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-N)
dc.source.urihttps://doi.org/10.1126/sciadv.1600495
dc.subjectPerovskite
dc.subjectelectrocatalysis
dc.subjectenergy conversion
dc.subjectnanostructures
dc.subjectoxygen evolution reaction
dc.subjectwater oxidation
dc.titleAn aqueous preoxidation method for monolithic perovskite electrocatalysts with enhanced water oxidation performance
dc.typeJournal article
pubs.publication-statusPublished

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