New strategy to synthesize oxygen vacancy-rich CoFe nanoneedles for overall water splitting and urea electrolysis

被引：71

作者：

Zhang, Qian ^{[1
]}

Sun, Maosong ^{[2
]}

Zhu, Jie ^{[1
]}

Yang, Sudong ^{[1
]}

Chen, Lin ^{[1
]}

Yang, Xulin ^{[3
]}

Wang, Pan ^{[3
]}

Li, Kui ^{[3
]}

Xue, Fengning ^{[4
]}

Lu, Yong ^{[4
]}

Zhang, Jicai ^{[2
,4
]}

Zhao, Peng ^{[1
]}

机构：

[1] Chengdu Univ, Inst Adv Study, 2025,Chengluo 12 Ave, Chengdu 610106, Peoples R China

[2] Guangxi Univ, Res Ctr Optoelect Mat & Devices, Sch Phys Sci Technol, Nanning 530004, Peoples R China

[3] Chengdu Univ, Sch Mech Engn, Chengdu 610106, Peoples R China

[4] Beijing Univ Chem Technol, Coll Math & Phys, Beijing 100029, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 432卷

基金：

中国国家自然科学基金;

关键词：

Oxygen vacancies; Nanoneedle structure; Overall water splitting; Urea oxidation reaction; EFFICIENT; ELECTROCATALYSTS; NANOARRAYS; OXYHYDRIDE; NANOSHEETS; BATIO3; GROWTH;

D O I：

10.1016/j.cej.2021.134275

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Developing highly efficient electrocatalysts for overall water splitting and urea oxidation reaction (UOR) is of significant importance to achieve hydrogen production. Herein, CoFe nanoneedles with abundant oxygen vacancies were prepared on Ni foam by hydrothermal method and CaH2 reduction method at different temperature in an evacuated (approximate to 10(-2) Pa) pyrex tube. The CoFe-250 exhibits an excellent OER activity with an overpotential of 230 mV at 10 mA cm(-2) in 1 M KOH and the symmetrical overall splitting electrolyzer using CoFe-250 as both anode and cathode dilivers 10 mA cm(-2) at the voltage of 1.47 V in 1 M KOH. More impressively, the overall water-urea electrolysis only requires 1.6 V to deliver 100 mA cm(-2) and reduces the overall energy consumption by 12.2 % in 1 M KOH with a 0.33 M urea. This work provides a highly active overall water splitting and UOR electrocatalysts for hydrogen production in an economic way.

引用

页数：9

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