Ag-Co<sub>3</sub> O<sub>4</sub> -CoOOH-Nanowires Tandem Catalyst for Efficient Electrocatalytic Conversion of Nitrate to Ammonia at Low Overpotential via Triple Reactions.

Wu, Shilu; Jiang, Yingyang; Luo, Wenjie; Xu, Peng; Huang, Longlong; Du, Yiwen; Wang, Hui; Zhou, Xuemei; Ge, Yongjie; Qian, Jinjie; Nie, Huagui; Yang, Zhi

Ag-Co₃ O₄ -CoOOH-Nanowires Tandem Catalyst for Efficient Electrocatalytic Conversion of Nitrate to Ammonia at Low Overpotential via Triple Reactions.

Wu, Shilu; Jiang, Yingyang; Luo, Wenjie; Xu, Peng; Huang, Longlong; Du, Yiwen; Wang, Hui; Zhou, Xuemei; Ge, Yongjie; Qian, Jinjie; Nie, Huagui; Yang, Zhi.

Afiliación

Wu S; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Jiang Y; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Luo W; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Xu P; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Huang L; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Du Y; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Wang H; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Zhou X; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Ge Y; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Qian J; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Nie H; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Yang Z; Key Laboratory of Carbon Materials of Zhejiang, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.

Adv Sci (Weinh) ; 10(33): e2303789, 2023 Nov.

Article en En | MEDLINE | ID: mdl-37822155

RESUMEN

The electrocatalytic conversion of nitrate (NO3 â¾) to NH3 (NO3 RR) offers a promising alternative to the Haber-Bosch process. However, the overall kinetic rate of NO3 RR is plagued by the complex proton-assisted multiple-electron transfer process. Herein, Ag/Co3 O4 /CoOOH nanowires (i-Ag/Co3 O4 NWs) tandem catalyst is designed to optimize the kinetic rate of intermediate reaction for NO3 RR simultaneously. The authors proved that NO3 â¾ ions are reduced to NO2 â¾ preferentially on Ag phases and then NO2 â¾ to NO on Co3 O4 phases. The CoOOH phases catalyze NO reduction to NH3 via NH2 OH intermediate. This unique catalyst efficiently converts NO3 â¾ to NH3 through a triple reaction with a high Faradaic efficiency (FE) of 94.3% and a high NH3 yield rate of 253.7 µmol h-1 cm-2 in 1 M KOH and 0.1 M KNO3 solution at -0.25 V versus RHE. The kinetic studies demonstrate that converting NH2 OH into NH3 is the rate-determining step (RDS) with an energy barrier of 0.151 eV over i-Ag/Co3 O4 NWs. Further applying i-Ag/Co3 O4 NWs as the cathode material, a novel Zn-nitrate battery exhibits a power density of 2.56 mW cm-2 and an FE of 91.4% for NH3 production.

Palabras clave

Ag/Co3O4/CoOOH NWs; ammonia; electrocatalysis; nitrate reduction; tandem catalysis; triple reactions

Texto completo

Imprimir

XML

PubMed Links

Buscar en Google