title: Hollow mesoporous NiCo2O4 nanocages as efficient electrocatalysts for oxygen evolution reaction.
abstract: The design and fabrication of efficient and inexpensive electrodes for oxygen evolution reaction (OER) is essential for energy-conversion technologies. Herein, high OER activity is achieved using hollow mesoporous NiCo2O4 nanocages synthesized via a Cu2O-templated strategy combined with coordination reaction. The NiCo2O4 nanostructures with a hollow cavity, large roughness and high porosity show only a small overpotential of ∼0.34 V at the current density of 10 mA cm(-2) and a Tafel slope of 75 mV per decade, which is comparable with the performance of the best reported transition metal oxide based OER catalysts in the literature. Meanwhile, the positive impacts of the nanocage structure and the Ni incorporation on the electrocatalytic performance are also demonstrated by comparing the OER activities of NiCo2O4 nanocages with Co3O4 nanocages, NiCo2O4 nanoparticles and 20 wt% Pt/C. Moreover, the NiCo2O4 nanocages also manifest superior stability to other materials. All these merits indicate that the hollow mesoporous NiCo2O4 nanocages are promising electrocatalysts for water oxidation.
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China. yhzhu@ecust.edu.cn xlyang@ecust.edu.cn.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Lv
authors.forename: Yihua
authors.initials: Y
authors.lastname: Zhu
authors.forename: Hongliang
authors.initials: H
authors.lastname: Jiang
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Yang
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Liu
authors.forename: Yunhe
authors.initials: Y
authors.lastname: Su
authors.forename: Jianfei
authors.initials: J
authors.lastname: Huang
authors.forename: Yifan
authors.initials: Y
authors.lastname: Yao
authors.forename: Chunzhong
authors.initials: C
authors.lastname: Li