F, P double-doped Fe3O4 with abundant defect sites for efficient hydrogen evolution at high current density. Issue 28 (6th July 2021)

• Record Type: Journal Article
• Authors: Zhang, Xin-Yu; Li, Feng-Ting; Fan, Ruo-Yao; Zhao, Jie; Dong, Bin; Wang, Fu-Li; Liu, Hai-Jun; Yu, Jian-Feng; Liu, Chen-Guang; Chai, Yong-Ming
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 28(2021)
• Page Start: 15836
• Page End: 15845
• Publication Date: 2021-07-06
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta03686f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The development of high activity electrocatalysts that can operate stably at high current density for the large-scale production of hydrogen is an important but challenging task. Abstract : The development of high activity electrocatalysts that can operate stably at high current density for the large-scale production of hydrogen is an important but challenging task. Herein, we report a simple method for constructing F, P double-doped Fe3 O4 with abundant defect sites for hydrogen evolution reaction (HER) on iron foam (F, P-Fe3 O4 /IF). Significantly, the obtained F, P-Fe3 O4 /IF showed great HER catalytic activity in high- and low-concentration alkaline electrolyte solutions. To drive 100 mA cm −2, it only required the overpotentials of 179.5 and 149.4 mV in 1 M and 6 M KOH solutions, respectively. Furthermore, the long-time stability test indicated that F, P-Fe3 O4 /IF lasted for more than 12 h at various high current densities (500, 1000 and 2000 mA cm −2 ), which revealed its great potential in the water electrolysis industry. Density functional theory (DFT) calculations revealed that doping with F and P could effectively optimize the electronic structure of Fe3 O4, thus lowering the hydrogen adsorption energy. This work provides a unique strategy of utilizing elements with different electronegativities for doping to improve the HER performance of iron oxides.