期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 20, 页码 18342-18348出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b01431
关键词
three-dimensional network; NiFe nanofiber; fast surface modification; self-supporting electrode; overall water splitting
资金
- Fundamental Research Funds for the Central Universities (CHD)
- National Natural Science Foundation of China [21776197, 21802103]
- Innovation Program of Shanghai Municipal Education Commission [16SG17]
Developing facile approaches to synthesize highly active and stable oxygen and hydrogen evolution electrocatalysts under mild conditions is crucial in water-splitting technology. Herein, Ni-nanofiber-based three-dimensional (3D) network is prepared by a magnetic-field-assisted reduction reaction and then a fast surface modification within only 3 s at room temperature is developed to prepare Fe@Ni-nanofiber-based 3D porous electrode. The unique structure of the nanofiber-based 3D electrode ensures large electrochemical active surface area, short electron diffusion pathway, and fast mass transportation, while the introduction of Fe enhances the activity of each active site with abundant Ni(Fe) (oxy)hydroxide on the surface. Hence, the obtained Fe@Ni nanofiber electrode exhibits excellent activity and stability toward oxygen evolution reaction and hydrogen evolution reaction, with overpotentials as low as 230 and 55 mV to achieve a current density of 10 mA cm(-2) in alkaline electrolyte, respectively. Moreover, when assembled into a two-electrode configuration, the cell voltage of only 1.53 V is needed to drive the water-splitting cell at 10 mA cm(-2).
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