Ultrathin cobalt oxide nanostructures with morphology-dependent electrocatalytic oxygen evolution activity

作者：Zhang, Nan; Wang, Yin; Hao, Yu-Chen; Ni, Yuan-Man; Su, Xin; Yin, An-Xiang^*; Hu, Chang-Wen^*

来源：Nanoscale, 2018, 10(43): 20313-20320.

DOI：10.1039/c8nr05337e

• HIGHLY EFFICIENT
• CO3O4
• NANOSHEETS
• OXIDATION
• VACANCIES
• CATALYST
• ARRAY
• CONSTRUCTION
• REDUCTION
• GRAPHENE

Engineering compositions, structures, and defects can endow nanomaterials with optimized catalytic properties. Here, we report that cobalt oxide (CoOx) ultrathin nanosheets (UTNS, approximate to 1.6 nm thick) with a large number of oxygen defects and mixed cobalt valences can be obtained through a facile one-step hydrothermal protocol. The large number of oxygen defects make the ultrathin CoOx nanosheet a superior OER catalyst with low overpotentials of 315 and 365 mV at current densities of 50 and 200 mA cm(-2), respectively. The stable framework-like architectures of the UTNS further ensure their high OER activity and durability. Our method represents a facile one-step preparation of CoOx nanostructures with tunable compositions, morphologies, and defects, and thus promotes OER properties. This strategy may find its wider applicability in designing active, robust, and easy-to-obtain catalysts for OER and other electrocatalytic systems.

• 出版日期2018-11-21
• 单位北京理工大学