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High‐rate electrochemical H2O2 production over multimetallic atom catalysts under acidic–neutral conditions.

Authors :
Tong, Yueyu
Liu, Jiaxin
Su, Bing‐Jian
Juang, Jenh‐Yih
Hou, Feng
Yin, Lichang
Dou, Shi Xue
Liang, Ji
Source :
Carbon Energy; Jan2024, Vol. 6 Issue 1, p1-19, 19p
Publication Year :
2024

Abstract

Hydrogen peroxide (H2O2) production by the electrochemical 2‐electron oxygen reduction reaction (2e− ORR) is a promising alternative to the energy‐intensive anthraquinone process, and single‐atom electrocatalysts show the unique capability of high selectivity toward 2e− ORR against the 4e− one. The extremely low surface density of the single‐atom sites and the inflexibility in manipulating their geometric/electronic configurations, however, compromise the H2O2 yield and impede further performance enhancement. Herein, we construct a family of multiatom catalysts (MACs), on which two or three single atoms are closely coordinated to form high‐density active sites that are versatile in their atomic configurations for optimal adsorption of essential *OOH species. Among them, the Cox–Ni MAC presents excellent electrocatalytic performance for 2e− ORR, in terms of its exceptionally high H2O2 yield in acidic electrolytes (28.96 mol L−1 gcat.−1 h−1) and high selectivity under acidic to neutral conditions in a wide potential region (>80%, 0–0.7 V). Operando X‐ray absorption and density functional theory analyses jointly unveil its unique trimetallic Co2NiN8 configuration, which efficiently induces an appropriate Ni–d orbital filling and modulates the *OOH adsorption, together boosting the electrocatalytic 2e− ORR capability. This work thus provides a new MAC strategy for tuning the geometric/electronic structure of active sites for 2e− ORR and other potential electrochemical processes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
Volume :
6
Issue :
1
Database :
Complementary Index
Journal :
Carbon Energy
Publication Type :
Academic Journal
Accession number :
175167835
Full Text :
https://doi.org/10.1002/cey2.378