Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 39, Pages 21745-21750Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05149
Keywords
water splitting; oxygen evolution reaction; electrocatalysis; codoped Co3O4; nanostructures
Funding
- National Natural Science Foundation of China [51402148]
- Guangdong High Tech Project [2014A010105005, 2014TQ01C494]
- Shenzhen Nanshan Innovation Project [KC2014JSQN0011A]
- SUSTC Foundation [FRG-SUSTC1501A-48]
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Nanostructured Co3O4 doped with Zn2+, Ni2+, and both were directly grown on an ITO substrate by an easily available hydrothermal method. The doped Co3O4 showed a unique structural morphology evolution upon controlling the doping elements and the doping ratio of the cations. For the codoped samples, the novel rhombus-shaped Co3O4 nanosheets doped with Zn2+ and Ni2+ (concentration ratio of 1:2) exhibited the optimal electrocatalytic performance. The sample showed a current density of 165 mA cm(-2) at 1.75 V, approximately 1.6 and 4 times higher than that of samples doped with Zn2+ and Ni2+ at a concentration ratio of 1:1 and 1:3. The unique architecture and its corresponding modified physical properties, such as high active-site density created by codoping, large structural porosity, and high roughness, are together responsible to its superior performance. For codoped Co3O4 nanostructures, Zn2+ facilitates the creation of Co cations in their high oxidation state as active centers, while Ni2+ contributed to the new active sites with lower activation energy. The synergistic effect of Zn2+ and Ni2+ doping can explain the improved physicochemical properties of codoped Co3O4 nanostructures.
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