Iron-modulated nickel cobalt phosphide embedded in carbon to boost power density of hybrid sodium-air battery

被引：53

作者：

Kang, Yao ^{[1
]}

Wang, Shuo ^{[1
]}

Zhu, Siqi ^{[1
]}

Gao, Haixing ^{[1
]}

Hui, Kwan San ^{[2
]}

Yuan, Cheng-Zong ^{[1
]}

Yin, Hong ^{[1
]}

Bin, Feng ^{[3
]}

Wu, Xi-Lin ^{[4
]}

Mai, Wenjie ^{[5
]}

Zhu, Ling ^{[6
]}

Hu, Maocong ^{[7
]}

Liang, Feng ^{[8
]}

Chen, Fuming ^{[9
]}

Hui, Kwun Nam ^{[1
]}

机构：

[1] Univ Macau, Joint Key Lab Minist Educ, Inst Appl Phys & Mat Engn, Ave Univ, Taipa 999078, Macau, Peoples R China

[2] Univ East Anglia, Engn, Fac Sci, Norwich NR4 7TJ, Norfolk, England

[3] Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China

[4] Zhejiang Normal Univ, Coll Geog & Environm Sci, Jinhua 321004, Zhejiang, Peoples R China

[5] Jinan Univ, Dept Phys, Guangdong Prov Engn Technol Res Ctr Vacuum Coatin, Siyuan Lab, Guangzhou 510632, Peoples R China

[6] Shenzhen Univ, Coll Phys & Optoelect Engn, Nanhai Ave 3688, Shenzhen 518060, Guangdong, Peoples R China

[7] Jianghan Univ, Sch Chem & Environm Engn, Key Lab Optoelect Chem Mat & Devices, Minist Educ, Wuhan 430056, Peoples R China

[8] Kunming Univ Sci & Technol, State Key Lab Complex Nonferrous Met Resources Cl, Kunming 650093, Yunnan, Peoples R China

[9] South China Normal Univ, Sch Phys & Telecommun Engn, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, Guangzhou 510006, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 285卷

关键词：

Iron doping; Nickel cobalt phosphide; Electronic structure reformation; DFT calculation; Hybrid sodium-air battery;

D O I：

10.1016/j.apcatb.2020.119786

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：

Nickel cobalt phosphide (NiCoP) is emerging as a potential electrocatalyst towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, its ORR/OER activities are sluggish. Here, we investigated the roles of iron dopants in the Fe-doped NiCoP (Fe-NiCoP) in order to boost its ORR/OER kinetics. The density functional theory (DFT) calculations reveal that the Fe dopant effectively modulates the electron conductivity of NiCoP and reduces binding energies of the reaction intermediates towards rate-determining steps of ORR and OER. A binder-free 3D microflowers morphology of the Fe-NiCoP embedded in the amorphous carbon layer (Fe-NiCoP@C) catalyst on the nickel foam was prepared as the air cathode for the hybrid sodium-air battery (HSAB). The HSAB displays a discharge voltage of 2.74 V at 0.01 mA cm(-2) with excellent round trip efficiency of 93.26 % at the 500th cycle and state-of-the-art power density of 621 mW g(-1).

引用

页数：11

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