Atomically Dispersed CoN3C1-TeN1C3 Diatomic Sites Anchored in N-Doped Carbon as Efficient Bifunctional Catalyst for Synergistic Electrocatalytic Hydrogen Evolution and Oxygen Reduction

被引：0

作者：

Wang, Minmin ^{[1
]}

Zheng, Xiuhui ^{[1
]}

Li, Min ^{[1
]}

Sun, Kaian ^{[2
]}

Liu, Chuhao ^{[2
]}

Cheong, Weng-Chon ^{[2
]}

Liu, Zhi ^{[1
]}

Chen, Yanju ^{[1
]}

Liu, Shoujie ^{[2
]}

Wang, Bin ^{[3
]}

Li, Yanpeng ^{[1
]}

Liu, Yunqi ^{[1
]}

Liu, Chenguang ^{[1
]}

Feng, Xiang ^{[1
]}

Yang, Chaohe ^{[1
]}

Pan, Yuan ^{[1
]}

Chen, Chen ^{[2
]}

机构：

[1] China Univ Petr East China, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China

[2] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

[3] Shaanxi Normal Univ, Sch Chem & Chem Engn, Xian 710119, Peoples R China

来源：

APPLIED GEOGRAPHY | 2022年 / 138卷

关键词：

bifunctional catalysts; diatomic active sites; electrochemistry; encapsulation-adsorption-pyrolysis strategy; extended X-ray absorption fine structure (EXAFS);

D O I：

暂无

中图分类号：

P9 [自然地理学]; K9 [地理];

学科分类号：

0705 ; 070501 ;

摘要：

A encapsulation-adsorption-pyrolysis strategy for the construction of atomically dispersed Co-Te diatomic sites (DASs) that are anchored in N-doped carbon is reported as an efficient bifunctional catalyst for electrocatalytic hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). The as-constructed catalyst shows the stable CoN3C1-TeN1C3 coordination structure before and after HER and ORR. The *OOH/*H intermediate species are captured by in situ Raman and in situ attenuated total reflectance-surface enhanced infrared absorption spectroscopy, indicating that the reactant O-2/H2O molecule has a strong interaction with the Co site, revealing that Co delta+ is an effective active site. Theoretical calculations show that the Co delta+ has adsorption-activation function and the neighboring Te delta+ acts as an electron donor adjusting the electronic structure of Co delta+, promoting the dissociation of H2O molecules and the adsorption of H and oxygen-containing intermediates in HER and ORR. In the meanwhile, the nearest C atom around Co also profoundly affects the adsorption of H atoms. This results in the weakening of the OH adsorption and enhancement of H adsorption, as well as the more stable water molecule dissociation transition state, thus significantly boosting ORR and HER performance.

引用

页数：12