Ambient Ammonia Synthesis via Electrochemical Reduction of Nitrate Enabled by NiCo2O4 Nanowire Array. Issue 13 (10th February 2022)

• Record Type: Journal Article
• Authors: Liu, Qian; Xie, Lisi; Liang, Jie; Ren, Yuchun; Wang, Yuanyuan; Zhang, Longcheng; Yue, Luchao; Li, Tingshuai; Luo, Yongsong; Li, Na; Tang, Bo; Liu, Yang; Gao, Shuyan; Alshehri, Abdulmohsen Ali; Shakir, Imran; Agboola, Philips O.; Kong, Qingquan; Wang, Qingyuan; Ma, Dongwei; Sun, Xuping
• Is Part Of: Small. Volume 18:Issue 13(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-10
• Subjects: ammonia electrosynthesis -- density functional theory -- electrocatalysis -- NiCo 2O 4 nanowire arrays -- nitrate reduction reaction; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202106961
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: NiCo2 O4 nanowire array on carbon cloth (NiCo2 O4 /CC) is proposed as a highly active electrocatalyst for ambient nitrate (NO3 − ) reduction to ammonia (NH3 ). In 0.1 m NaOH solution with 0.1 m NaNO3, such NiCo2 O4 /CC achieves a high Faradic efficiency of 99.0% and a large NH3 yield up to 973.2 µmol h −1 cm −2 . The superior catalytic activity of NiCo2 O4 comes from its half‐metal feature and optimized adsorption energy due to the existence of Ni in the crystal structure. A Zn‐NO3 − battery with NiCo2 O4 /CC cathode also shows a record‐high battery performance. Abstract : NiCo2 O4 nanowire array on carbon cloth is an efficient electrocatalyst for NO3 − to NH3 conversion under ambient conditions, achieving a high Faradic efficiency of 99.0% and a large NH3 yield up to 973.2 µmol h −1 cm −2 in 0.1 m NaOH with 0.1 m NO3 − . The catalytic mechanism is investigated by theoretical calculations.