Li, B.-Q.Tang, C.Wang, H.-F.Zhu, X.-L.Zhang, Q.2021-01-272021-01-272016Science Advances, 2016; 2(10):1-62375-25482375-2548http://hdl.handle.net/2440/129647Perovskite 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.en2016 © 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)Perovskiteelectrocatalysisenergy conversionnanostructuresoxygen evolution reactionwater oxidationJournal article100002050010.1126/sciadv.16004950003879915000102-s2.0-85041357100531559Tang, C. [0000-0002-5167-1192]