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 (Co3(PO4)2). A reduced graphene oxide-wrapped CoP/Co2P hybrid microflower was successfully synthesized by a facile coprecipitation method in a Co3(PO4)2 matrix, followed by a thermal reduction process. Co3(PO4)2 can be transformed to CoP/Co2P by treatment at 700°C for 1 hour, maintaining the original particle morphology with the assistance of reduced graphene oxide (rGO). In a 0.5 mol/L H2SO4 solution, the rGO-CoP/Co2P microflower catalyzes the hydrogen evolution reaction with an overpotential of 156 mV at a current density of 10 mA cm−2, a Tafel slope of 53.8 mV dec−1, and good stability as observed through long-term CV and chronoamperometry tests.
Original language | English |
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Pages (from-to) | 3749-3754 |
Number of pages | 6 |
Journal | Journal of the American Ceramic Society |
Volume | 101 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2018 Sep |
Keywords
- catalysts/catalysis
- cobalt/cobalt compounds
- graphene oxide
- hydrogen evolution reaction
- phosphates
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry