Initiating an efficient electrocatalyst for water splitting via valence configuration of cobalt-iron oxide

被引：78

作者：

Guo, Peng ^{[1
]}

Wang, Zhaojie ^{[1
]}

Zhang, Tian ^{[1
]}

Chen, Chen ^{[2
]}

Chen, Yalan ^{[2
]}

Li, Haijun ^{[3
]}

Hua, Minglei ^{[1
]}

Wei, Shuxian ^{[3
]}

Lu, Xiaoqing ^{[1
]}

机构：

[1] China Univ Petr, Sch Mat Sci & Engn, Qingdao 266580, Shandong, Peoples R China

[2] China Univ Petr, Coll Chem Engn, Qingdao 266580, Shandong, Peoples R China

[3] China Univ Petr, Coll Sci, Qingdao 266580, Shandong, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2019年 / 258卷

关键词：

Cobalt-iron oxide; Chemical tailoring; Valance configuration; Water splitting; DFT calculations; OXYGEN EVOLUTION REACTION; PRUSSIAN-BLUE-ANALOG; HYDROGEN EVOLUTION; BIFUNCTIONAL ELECTROCATALYSTS; ALKALINE; NANOSHEETS; OXIDATION; CATALYSTS; NANOCAGES; ARRAY;

D O I：

10.1016/j.apcatb.2019.117968

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Engineering valence state of active center in non-noble metal-based electrocatalysts is of prime importance to enhance the performance for different catalytic reactions. However, studies on optimized valence configuration with extremely high activity remains a great challenge because of scanty chemical approaches. Herein, a kind of CoFe-oxide nanocubes with tunable valence composition was rationally designed for boosting water splitting electrocatalysis by partially chemical tailoring Prussian blue analogue. The resulting Co2+-rich CoFe-oxide nanocube ((CoFe)-Fe-II-ONC) exhibited higher OER and HER catalytic performance than the well-balanced CoFe-oxide. It demanded overpotentials of only 289 mV and 284 mV to drive a current density of 50 mA cm(-2) for OER and HER in 1.0 M KOH, respectively. The DFT calculations revealed that Co Fe-ONC is more favorable for OER and HER since the higher capacity of water adsorption, optimized route for electrons transferring, and lower energy barrier for water dissociation by the active valance configuration.

引用

页数：8