Anodically electrodeposited Co+Ni mixed oxide electrode: preparation and electrocatalytic activity for oxygen evolution in alkaline media

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.06.027· OSTI ID:20653385

Gang, Wu ^[1]; Ning, Li ^[2]; Derui, Zhou ^[2]; Mitsuo, Kurachi ^[3]; Boqing, Xu ^[1]

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1. Innovative Catalysis Program, Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084 (China)
2. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001 (China)
3. Faculty of Engineering, Kyoto University, Kyoto 606-8283 (Japan)

Co+Ni mixed oxides on Ni substrate were prepared through anodic electrodeposition from Co(NO{sub 3}){sub 2} and Ni(NO{sub 3}){sub 2} aqueous solutions with five different Co{sup 2+}/Ni{sup 2+} ratios beside only Co{sup 2+}. By the electrochemical measurements, the optimum performance in electrocatalytic activity for oxygen evolution reaction in alkaline media was obtained on the Co+Ni mixed oxide deposited from the solution containing Co{sup 2+}/Ni{sup 2+} ratio of 1:1. The mixed oxide is corresponding to about 68at% Co contents with spinel-type NiCo{sub 2}O{sub 4} phase and porosity surface structure. The electrochemical kinetic parameters including exchange current density, Tafel slopes, reaction order with respect to [OH{sup -}] and standard electrochemical enthalpy of activation were analyzed also. A possible mechanism involving the formation of a physisorbed hydrogen peroxide intermediate in a slow electrochemical step was presented, which accounts for the values of the experimental results.

• OSTI ID: 20653385
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
COBALT IONS
COBALT NITRATES
COBALT OXIDES
ELECTRODEPOSITION
ELECTRODES
ENTHALPY
HYDROGEN PEROXIDE
NICKEL IONS
NICKEL NITRATES
NICKEL OXIDES
OXYGEN
POROSITY