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Thermally reduced rGO-wrapped CoP/Co2P hybrid microflower as an electrocatalyst for hydrogen evolution reaction

Authors
Kim, Taek-SeungSong, Hee JoDar, Mushtaq AhmadShim, Hyun-WooKim, Dong-Wan
Issue Date
9월-2018
Publisher
WILEY
Keywords
catalysts; catalysis; cobalt; cobalt compounds; graphene oxide; hydrogen evolution reaction; phosphates
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.101, no.9, pp.3749 - 3754
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume
101
Number
9
Start Page
3749
End Page
3754
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/73258
DOI
10.1111/jace.15581
ISSN
0002-7820
Abstract
Cobalt phosphides (CoPx) are potential candidates for use as high-efficiency hydrogen evolution reaction electrocatalysts that can replace noble metals, such as Pt. Typically, CoPx can be synthesized by phosphidation with Co-based precursors such as oxides or hydroxides. In this study, we propose a new strategy for synthesizing CoPx through the thermal reduction in cobalt phosphate (Co-3(PO4)(2)). A reduced graphene oxide-wrapped CoP/Co2P hybrid microflower was successfully synthesized by a facile coprecipitation method in a Co-3(PO4)(2) matrix, followed by a thermal reduction process. Co-3(PO4)(2) can be transformed to CoP/Co2P by treatment at 700 degrees C for 1hour, maintaining the original particle morphology with the assistance of reduced graphene oxide (rGO). In a 0.5mol/L H2SO4 solution, the rGO-CoP/Co2P microflower catalyzes the hydrogen evolution reaction with an overpotential of 156 mV at a current density of 10mA cm(-2), a Tafel slope of 53.8mV dec(-1), and good stability as observed through long-term CV and chronoamperometry tests.
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