Details

Autor(en) / Beteiligte

• Cai, Jingjing
• Zhang, Huijian
• Zhang, Lizhu
• Xiong, Yuqing
• Ouyang, Ting
• Liu, Zhao‐Qing

Titel

Hetero‐Anionic Structure Activated CoS Bonds Promote Oxygen Electrocatalytic Activity for High‐Efficiency Zinc–Air Batteries

Ist Teil von

• Advanced materials (Weinheim), 2023-09, Vol.35 (36), p.e2303488-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Quelle

Wiley Online Library

Beschreibungen/Notizen

• The electronic structure of transition metal complexes can be modulated by replacing partial ion of complexes to obtain tuned intrinsic oxygen reduction reaction (ORR) or oxygen evolution reaction (OER) electrocatalytic activity. However, the anion‐modulated transition metal complexes ORR activity of is still unsatisfactory, and the construction of hetero‐anionic structure remains challenging. Herein, an atomic doping strategy is presented to prepare the CuCo2O4‐xSx/NC‐2 (CCSO/NC‐2) as electrocatalysts, the structrual characterization results favorably demonstrate the partial substitution of S atoms for O in CCSO/NC‐2, which shows excellent catalytic performance and durability for OER and ORR in 0.1 m KOH. In addition, the catalyst assembled Zinc–air battery with an open circuit potential of 1.43 V maintains performance after 300 h of cyclic stability. Theoretical calculations and differential charges illustrate that S doping optimizes the reaction kinetics and promotes electron redistribution. The superior performance of CCSO/NC‐2 catalysis is mainly due to its unique S modulation of the electronic structure of the main body. The introduction of S promotes CoO covalency and constructs a fast electron transport channel, thus optimizing the adsorption degree of active site Co to the reaction intermediates. To investigate the bifunctional performance of hetero‐anionic structure for oxygen electrocatalysis, CuCo2O4‐xSx/NC‐2 catalysts are constructed and afford excellent catalytic performance in oxygen reduction reaction (ORR) or oxygen evolution reaction (OER). The superior performance of the CuCo2O4‐xSx/NC‐2 catalysts is attributed to the unique S modulation of the main body electronic structure, CoS bond provides fast electron transport channel, thus optimizing the adsorption degree of active site Co to the reaction intermediates.