Ambient Ammonia Synthesis via Electrochemical Reduction of Nitrate Enabled by NiCo<sub>2</sub>O<sub>4</sub> Nanowire Array
Qian Liu(Chengdu University), Lisi Xie(Chengdu University), Jie Liang(University of Electronic Science and Technology of China), Yuchun Ren(University of Electronic Science and Technology of China), Yuanyuan Wang(Henan University), Longcheng Zhang(University of Electronic Science and Technology of China), Luchao Yue(University of Electronic Science and Technology of China), Tingshuai Li(University of Electronic Science and Technology of China), Yongsong Luo(University of Electronic Science and Technology of China), Na Li(Shandong Normal University), Bo Tang(Shandong Normal University), Yang Liu(Henan Normal University), Shuyan Gao(Henan Normal University), Abdulmohsen Ali Alshehri(King Abdulaziz University), Imran Shakir(King Saud University), Philips O. Agboola(King Saud University), Qingquan Kong(Chengdu University), Qingyuan Wang(Chengdu University), Dongwei Ma(Henan University), Xuping Sun(University of Electronic Science and Technology of China)
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Abstract
Abstract NiCo 2 O 4 nanowire array on carbon cloth (NiCo 2 O 4 /CC) is proposed as a highly active electrocatalyst for ambient nitrate (NO 3 − ) reduction to ammonia (NH 3 ). In 0.1 m NaOH solution with 0.1 m NaNO 3 , such NiCo 2 O 4 /CC achieves a high Faradic efficiency of 99.0% and a large NH 3 yield up to 973.2 µmol h −1 cm −2 . The superior catalytic activity of NiCo 2 O 4 comes from its half‐metal feature and optimized adsorption energy due to the existence of Ni in the crystal structure. A Zn‐NO 3 − battery with NiCo 2 O 4 /CC cathode also shows a record‐high battery performance.
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