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Self‐Templated Synthesis of Co 1‐ x S Porous Hexagonal Microplates for Efficient Electrocatalytic Oxygen Evolution
Author(s) -
Liu Yangxing,
Zhang Junfeng,
Li Yunwei,
Yuan Gang,
Niu Xiaopo,
Zhang Xiangwen,
Wang Qingfa
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800026
Subject(s) - tafel equation , overpotential , kirkendall effect , catalysis , materials science , chemical engineering , oxygen evolution , electrochemistry , porosity , electrolyte , transition metal , nanotechnology , nanostructure , electrocatalyst , chemistry , electrode , organic chemistry , metallurgy , composite material , engineering
Abstract Transition‐metal chalcogenides have been widely investigated as a class of promising oxygen evolution reaction (OER) catalysts. But, they are still far from practical use because of moderate catalytic activity. Two‐dimensional (2D) materials with porous nanostructures are attractive for the efficient conversion of electrochemical energy. Herein, Co 1‐ x S novel porous microplates were synthesized through a facile self‐templated strategy based on the Kirkendall effect. By taking advantages of porous nanostructure and good catalytic properties of the hexagonal Co(OH) 2 template, the unique Co 1‐ x S microplates provide higher efficient surface area and more accessible active sites. Moreover, the mass transfer and gas diffusion are also promoted, owing to the pores developed inside the microplates. As expected, the optimized porous Co 1‐ x S microplates demonstrate remarkable OER performance in alkaline electrolyte with an overpotential of 311 mV at 10 mA cm −2 , a Tafel slope of 55 mV dec −1 and long‐term stability, which outperform the commercial IrO 2 catalyst. The facile preparation, high catalytic activity, and excellent durability of the Co 1‐ x S porous hexagonal microplates show great promise in energy conversion applications.