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Type: Journal article
Title: Highly defective layered double perovskite oxide for efficient energy storage via reversible pseudocapacitive oxygen-anion intercalation
Author: Liu, Y.
Wang, Z.
Veder, J.-P.M.
Xu, Z.
Zhong, Y.
Zhou, W.
Tade, M.O.
Wang, S.
Shao, Z.
Citation: Advanced Energy Materials, 2018; 8(11):1702604-1-1702604-11
Publisher: Wiley
Issue Date: 2018
ISSN: 1614-6832
Statement of
Yu Liu, Zhenbin Wang, Jean-Pierre Marcel Veder, Zhenye Xu, Yijun Zhong, Wei Zhou, Moses O. Tade, Shaobin Wang, and Zongping Shao
Abstract: The use of perovskite materials as anion‐based intercalation pseudocapacitor electrodes has received significant attention in recent years. Notably, these materials, characterized by high oxygen vacancy concentrations, do not require high surface areas to achieve a high energy storage capacity as a result of the bulk intercalation mechanism. This study reports that reduced PrBaMn₂O₆–δ (r‐PBM), possessing a layered double perovskite structure, exhibits ultrahigh capacitance and functions as an excellent oxygen anion‐intercalation‐type electrode material for supercapacitors. Formation of the layered double perovskite structure, as facilitated by hydrogen treatment, is shown to significantly enhance the capacitance, with the resulting r‐PBM material demonstrating a very high gravimetric capacitance of 1034.8 F g⁻¹ and an excellent volumetric capacitance of ≈2535.3 F cm⁻³ at a current density of 1 A g⁻¹. The resultant formation of a double perovskite crystal oxide with a specific layered structure leads to the r‐PBM with a substantially higher oxygen diffusion rate and oxygen vacancy concentration. These superior characteristics show immense promise for their application as oxygen anion‐intercalation‐type electrodes in pseudocapacitors.
Keywords: Double perovskite oxides; high oxygen vacancy concentration; oxygen-ion intercalation; pseudocapacitive supercapacitors
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/aenm.201702604
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Chemical Engineering publications

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