標題: Two-Dimensional Cobalt Phosphate Hydroxide Nanosheets: A New Type of High-Performance Electrocatalysts with Intrinsic CoO6 Lattice Distortion for Water Oxidation
作者: Bu, Xiuming
Chiang, ChaoLung
Wei, Renjie
Li, Zebiao
Meng, You
Peng, ChunKuo
Lin, YuChang
Li, Yangyang
Lin, YanGu
Chan, Kwok Sum
Ho, Johnny C.
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Co-5(PO4)(2)(OH)(4);nanosheet;lattice distortion;electrocatalyst;oxygen evolution reaction
公開日期: 23-十月-2019
摘要: Despite the recent advances in electrochemical water splitting, developing cost-effective and highly efficient electrocatalysts for oxygen evolution reaction (OER) still remains a substantial challenge. Herein, two-dimensional cobalt phosphate hydroxides (Co-5(PO4)(2)(OH)(4)) nanosheets, a unique stacking-disordered phosphate-based inorganic material, are successfully prepared via a facile and scalable method for the first time to serve as a superior and robust electrocatalyst for water oxidation. On the basis of the detailed characterization (e.g., X-ray absorption near-edge structure and X-ray photoelectron spectroscopy), the obtained nanosheets consist of special zigzag CoO6 octahedral chains along with intrinsic lattice distortion and excellent hydrophilicity, in which these factors contribute to the highly efficient performance of prepared electrocatalysts for OER. Specifically, (Co-5(PO4)(2)(OH)(4)) deposited on glassy carbon electrode (loading amount approximate to 0.553 mg cm -2 ) can exhibit an unprecedented overpotential of 254 mV to drive a current density of 10 mA cm(-2) with a small Tafel slope of 57 mV dec(-1) in alkaline electrolytes, which outperforms the ones of CO3(PO4)(2)(370 mV) and Co(OH)(2) (360 mV) as well as other advanced catalysts. Evidently, this work has opened a new pathway to the rational design of promising metal phosphate hydroxides toward the efficient electrochemical energy conversion.
URI: http://dx.doi.org/10.1021/acsami.9b11594
http://hdl.handle.net/11536/153189
ISSN: 1944-8244
DOI: 10.1021/acsami.9b11594
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 11
Issue: 42
起始頁: 38633
結束頁: 38640
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