An aqueous preoxidation method for monolithic perovskite electrocatalysts with enhanced water oxidation performance
Date
2016
Authors
Li, B.-Q.
Tang, C.
Wang, H.-F.
Zhu, X.-L.
Zhang, Q.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Science Advances, 2016; 2(10):1-6
Statement of Responsibility
Bo-Quan Li, Cheng Tang, Hao-Fan Wang, Xiao-Lin Zhu, Qiang Zhang
Conference Name
Abstract
Perovskite 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.
School/Discipline
Dissertation Note
Provenance
Description
Access Status
Rights
2016 © 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)