American Chemical Society
ic8b00411_si_001.pdf (2.69 MB)

Surface Engineering of a Nickel Oxide–Nickel Hybrid Nanoarray as a Versatile Catalyst for Both Superior Water and Urea Oxidation

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journal contribution
posted on 2018-04-03, 19:49 authored by Zhihao Yue, Wenxin Zhu, Yuanzhen Li, Ziyi Wei, Na Hu, Yourui Suo, Jianlong Wang
Developing efficient and low-cost oxygen evolution reaction (OER) electrodes is a pressing but still challenging task for energy conversion technologies such as water electrolysis, regenerative fuel cells, and rechargeable metal–air batteries. Hence, this study reports that a nickel oxide–nickel hybrid nanoarray on nickel foam (NiO–Ni/NF) could act as a versatile anode for superior water and urea oxidation. Impressively, this anode could attain high current densities of 50 and 100 mA cm–2 at extremely low overpotentials of 292 and 323 mV for OER, respectively. Besides, this electrode also shows excellent activity for urea oxidation with the need for just 0.28 and 0.36 V (vs SCE) to attain 10 and 100 mA cm–2 in 1.0 M KOH with 0.33 M urea, respectively. The enhanced oxidation performance should be due to the synergistic effect of NiO and Ni, improved conductivity, and enlarged active surface area.