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 |
|---|---|
| Journal | Journal of the American Ceramic Society |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
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Keywords
- Catalysts/catalysis
- Cobalt/cobalt compounds
- Graphene oxide
- Hydrogen evolution reaction
- Phosphates
ASJC Scopus subject areas
- Ceramics and Composites
- Geology
- Geochemistry and Petrology
- Materials Chemistry
Cite this
Thermally reduced rGO-wrapped CoP/Co2P hybrid microflower as an electrocatalyst for hydrogen evolution reaction. / Kim, Taek Seung; Song, Hee Jo; Dar, Mushtaq Ahmad; Shim, Hyun Woo; Kim, Dong-Wan.
In: Journal of the American Ceramic Society, 01.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Thermally reduced rGO-wrapped CoP/Co2P hybrid microflower as an electrocatalyst for hydrogen evolution reaction
AU - Kim, Taek Seung
AU - Song, Hee Jo
AU - Dar, Mushtaq Ahmad
AU - Shim, Hyun Woo
AU - Kim, Dong-Wan
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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.
KW - Catalysts/catalysis
KW - Cobalt/cobalt compounds
KW - Graphene oxide
KW - Hydrogen evolution reaction
KW - Phosphates
UR - http://www.scopus.com/inward/record.url?scp=85045770242&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85045770242&partnerID=8YFLogxK
U2 - 10.1111/jace.15581
DO - 10.1111/jace.15581
M3 - Article
AN - SCOPUS:85045770242
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
ER -