Reduced Graphene Oxide Supported Cobalt-Calcium Phosphate Composite for Electrochemical Water Oxidationopen access
- Lee, Keunyoung; Yang, Wonseok; Pyo, Eunji; Choi, Hyebin; Cha, Yeona; Lee, Seonhong; Kim, Chung Soo; Lim, Dong-Kwon; Kwon, Ki-Young
- Issue Date
- OER; calcium phosphate; graphene
- CATALYSTS, v.11, no.8
- Journal Title
- We report the oxygen evolution reaction (OER) catalyst composed of cobalt-calcium phosphate on reduced graphene oxide (CoCaP/rGO). Our catalyst is prepared by the anodic electrolysis of calcium phosphate/rGO mixture loaded on indium-tin-oxide (ITO) in Co2+ aqueous solution. TEM, XPS and XRD experiments confirm that the crystal phase of calcium phosphate (CaP) is transferred into an amorphous phase of calcium oxide with phosphate (5.06 at%) after anodic electrolysis. Additionally, the main cation component of calcium is replaced by cobalt ion. The current-voltage characteristics of CoCaP/rGO showed a shoulder peak at 1.10 V vs. NHE, which originated from Co2+ to higher oxidation states (Co3+ or Co4+) and a strong wave from water oxidation higher +1.16 V vs. NHE at neutral condition (pH 7). CoCaP and CoCaP/rGO showed 4.8 and 10 mA/cm(2) at 0.47 V of overpotential, respectively. The enhanced OER catalytic activity of CoCaP/rGO arises from the synergetic interaction between the amorphous phase of CoCaP and electric conducting graphene sheets.
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- 자연과학대학 > 화학과 > Journal Articles
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