Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5149779 | Journal of Power Sources | 2017 | 7 Pages |
Abstract
Electrochemical water splitting has attracted great interest because of the growing demand for sustainable energy and increasing concerns for the environment. We present a facile strategy to design the three-dimensional (3D) urchin-like sphere arrays Co3O4 as an effective bifunctional catalyst for electrochemical water splitting. The 3D urchin-like Co3O4 was directly grown on Ni foam by a hydrothermal reaction and annealing treatment at a low temperature. This process offers several advantages including facile synthesis, binder-free, and low cost. The 3D urchin-like Co3O4 as a catalyst for hydrogen evolution reaction exhibits a low onset potential (â130Â mV vs. RHE) and good cycling stability in an alkaline electrolyte. When urchin-like Co3O4 is used as a catalyst for oxygen evolution reaction, the onset potential is at 1.46Â V (vs. RHE) with a low overpotential of only 230Â mV. The good catalytic activity can be attributed to the unique urchin-like nanostructure, abundant mesopores, and low charge-transfer resistance (compared with Co3O4 NPs). In addition, H2 and O2 generation was performed using Co3O4 as both cathode and anode catalysts with a potential of 1.64Â V to reach a current density of 10Â mAÂ cmâ2.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Ruchun Li, Dan Zhou, Jiaxian Luo, Weiming Xu, Jingwei Li, Shuoshuo Li, Pengpeng Cheng, Dingsheng Yuan,