Institute for Advanced Study, Chengdu University, Chengdu, Sichuan 610106, China; Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Zixiao Li
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Jie Yao
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Kai Dong
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Xiuhong Li
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Long Hu
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Shengjun Sun
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China
Zhengwei Cai
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China
Dongdong Zheng
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China
Yongsong Luo
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Binwu Ying
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
Mohamed S. Hamdy
Catalysis Research Group (CRG), Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, 61413 Abha, Saudi Arabia
Lisi Xie
Institute for Advanced Study, Chengdu University, Chengdu, Sichuan 610106, China
Qian Liu
Institute for Advanced Study, Chengdu University, Chengdu, Sichuan 610106, China; Corresponding author
Xuping Sun
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China; College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China; Corresponding author
Summary: Electrochemical reduction of nitrite (NO2−) can satisfy the necessity for NO2− contaminant removal and deliver a sustainable pathway for ammonia (NH3) generation. Its practical application yet requires highly efficient electrocatalysts to boost NH3 yield and Faradaic efficiency (FE). In this study, CoP nanoparticle-decorated TiO2 nanoribbon array on Ti plate (CoP@TiO2/TP) is verified as a high-efficiency electrocatalyst for the selective reduction of NO2− to NH3. When measured in 0.1 M NaOH with NO2−, the freestanding CoP@TiO2/TP electrode delivers a large NH3 yield of 849.57 μmol h−1 cm−2 and a high FE of 97.01% with good stability. Remarkably, the subsequently fabricated Zn–NO2− battery achieves a high power density of 1.24 mW cm−2 while delivering a NH3 yield of 714.40 μg h−1 cm−2.
