| Autor: |
Shi, Xin, Wang, Hui, Kannan, Palanisamy, Ding, Jieting, Ji, Shan, Liu, Fusheng, Gai, Hengjun, Wang, Rongfang |
| Zdroj: |
Journal of Materials Chemistry A; 2/21/2019, Vol. 7 Issue 7, p3344-3352, 9p |
| Abstrakt: |
Controllable nanoarchitecture arrays of the transition metal selenide, supported on conductive substrates, are promising materials for high-performance electrochemical energy storage and conversion applications. Herein, Ni3Se2 nanowire arrays with a rich-grain-boundary are rationally grown on a nickel foam (NF) substrate by the solvothermal method. Under optimized conditions, the Ni3Se2 nanowire arrays prominently display high areal capacitance of 635 μA h cm−2 at a current density of 3 mA cm−2 and excellent rate capability. As an asymmetric supercapacitor, the Ni3Se2 electrode (cathode) shows a high energy density of 42.6 W h kg−1 at a power density of 284.8 W kg−1. When used as a two-dimensional (2D) electrode for water splitting reaction, the Ni3Se2 electrode exhibits high catalytic activity to achieve 100 mA cm−2 at an overpotential of 320 mV in the oxygen evolution reaction and a low overpotential of 95 mV at a current density of 50 mA cm−2 in the hydrogen evolution reaction in a 1.0 M KOH solution. The Ni3Se2 nanowire array electrode is shown to be a high-performance alkaline water electrolyzer with current density of 10 mA cm−2 at a cell voltage of 1.62 V. The results demonstrate Ni3Se2 as a promising 2D highly active electrode for electrochemical energy storage and conversion applications. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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