Phosphorus-doped cobalt oxide constructs high and low valence Cobalt: Efficient synergistic catalytic electrooxidation of sodium borohydride

Sun，Tong1; Li，Yiju2; Liu，Youzhi1; Jiao，Weizhou1; Zhang，Dongming1

2023-09-15

10.1016/j.cej.2023.145133

Chemical Engineering Journal   Impact Factor & Quartile

1385-8947

1873-3212

Low-cost, high-performance electrode materials for mitigating hydrogen release are urgently needed for anodes of direct borohydride fuel cells (DBFC). Herein, CoP-CoO with both high (Co) and low (Co) valence cobalt is successfully constructed by regulating the Co valence state by P and O and achieves efficient catalysis of NaBH electrooxidation. Co has an extremely strong ability to break B-H bonds, and Co is near the grain boundaries to provide strong adsorption of electronegative reactants and uneven stress on B-H bonds. Benefiting from the synergistic effect of high and low valence cobalt, and the unique inner hole structure of material induced by the phosphorylation process, the direct sodium borohydride-hydrogen peroxide fuel cells (DBHPFC) assembled with CoP-CoO as anodes can reach a maximum power density of 280 mW cm at room temperature. Meanwhile, high phosphorus doping is effective in improving fuel utilization. This work provides a cost-effective, highly-active anode engineering strategy for DBFC and attracts attention to the valence state of cobalt-based materials in the field of catalytic NaBH electrooxidation.

Cobalt Oxide Cobalt Phosphorus Direct Borohydride Fuel Cell Fuel Utilization Valence Engineering

SCI

English

Corresponding

Booz Allen Foundation[201701D221047];Booz Allen Foundation[21703208];

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:001051594500001

ELSEVIER SCIENCE SA

ENGINEERING

2-s2.0-85166574032

Scopus

1.Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering,North University of China,Taiyuan,030051,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Sun，Tong,Li，Yiju,Liu，Youzhi,et al. Phosphorus-doped cobalt oxide constructs high and low valence Cobalt: Efficient synergistic catalytic electrooxidation of sodium borohydride[J]. Chemical Engineering Journal,2023,472.

Sun，Tong,Li，Yiju,Liu，Youzhi,Jiao，Weizhou,&Zhang，Dongming.(2023).Phosphorus-doped cobalt oxide constructs high and low valence Cobalt: Efficient synergistic catalytic electrooxidation of sodium borohydride.Chemical Engineering Journal,472.

Sun，Tong,et al."Phosphorus-doped cobalt oxide constructs high and low valence Cobalt: Efficient synergistic catalytic electrooxidation of sodium borohydride".Chemical Engineering Journal 472(2023).