期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 26, 页码 9813-9821出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c02421
关键词
2D nanomaterials; Hierarchical porous structure; Co3O4 nanosheets; High Co3+/Co2+ ratio; Oxygen evolution reaction
资金
- National Natural Science Foundation of China [21875039]
- Minjiang Professorship [XRC-1677]
- Fujian province's high level innovative and entrepreneurial talents [50012709]
- Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University [SKLPEE-201814]
Herein, a hydrazine hydrate (N2H4) induced sacrificial template method is reported for controlled synthesis of 2D porous Co3O4 nanosheets (p-Co3O4 NSs) with adjustable thickness and abundant hierarchical pore structure. The introduction of N2H4 modulates the density of Co2+ anchored on the surface of GO by adjusting the number of oxygen functional groups for Co2+/GO composites and then controls the thickness and electronic valence of Co3O4 nanosheets during subsequent pyrolysis in air. As a result, the optimized 2D p-Co3O4 NSs have ultrathin thickness, abundant hierarchical porous structure, and a high Co3+/Co2+ ratio. As expected, it exhibits excellent OER catalytic performance in 1 M KOH solutions, affording a lower overpotential of 1.50 V at 10.0 mA cm(-2) and robust stability compared to pristine Co3O4 and RuO2 as a benchmark. The outstanding OER catalytic activity is ascribed to its N2H4 induced ultrathin 2D structure with abundant hierarchical pores and a high Co3+/Co2+ ratio. The density functional theory (DFT) calculations reveal that the ultrathin layer Co3O4 nanosheets with a high ratio of Co3+/Co2+ enhance the OER activity through promoting the dissociation of water to OH* and accelerating kinetics of OER in alkaline media.
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