选择性
催化作用
化学
杂原子
氧气
电催化剂
钴
光化学
无机化学
电化学
有机化学
物理化学
戒指(化学)
电极
作者
Shanyong Chen,Tao Luo,Jing Wang,Jiaqi Xiang,Xiaoqing Li,Chao Ma,Cheng‐Wei Kao,Ting‐Shan Chan,You‐Nian Liu,Min Liu
标识
DOI:10.1002/anie.202418713
摘要
In oxygen reduction reaction to H2O2via two‐electron pathway (2e‐ ORR), adsorption strength of oxygen‐containing intermediates determines both catalytic activity and selectivity. However, it also causes activity‐selectivity trade‐off. Herein, we propose a novel strategy through modulating the interaction between protons and *OOH intermediates to break the activity‐selectivity trade‐off for highly active and selective 2e‐ ORR. Taking the typical cobalt‐nitrogen‐carbon single‐atom catalyst as an example, boron heteroatoms doped into second coordination sphere of CoN4 (Co1‐NBC) increase proton affinity on catalyst surface, facilitating proton attack on the former oxygen of *OOH and thereby promoting H2O2 formation. As a result, Co1‐NBC simultaneously achieves prominent 2e‐ ORR activity and selectivity in acid with onset potential of 0.724 V vs. RHE and H2O2 selectivity of 94%, surpassing most reported catalysts. Furthermore, Co1‐NBC exhibits a record‐high H2O2 productivity of 202.7 mg cm‐2 h‐1 and a remarkable stability of 60 h at 200 mA cm‐2 in flow cell. This work provides new insights into resolving activity‐selectivity trade‐off in electrocatalysis.
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