Hierarchical iron nickel oxide architectures derived from metal-organic frameworks as efficient electrocatalysts for oxygen evolution reaction. (1st August 2016)

• Record Type: Journal Article
• Authors: Jiang, Jing; Zhang, Caihong; Ai, Lunhong
• Is Part Of: Electrochimica acta. Volume 208(2016)
• Page Start: 17
• Page End: 24
• Publication Date: 2016-08-01
• Subjects: Oxygen evolution reaction -- Water oxidation -- Nickel -- Iron -- Electrocatalyst; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.05.008
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Hierarchical iron nickel oxide architectureswere prepared using MOFs as sacrificial template. Iron nickel oxide were explored as a novel electrocatalyst for catalyzing OERin alkaline media. Electrocatalytic activity toward OER of iron nickel oxides is dependent on the Fe/Ni ratio. Spinel structured NiFe2 O4 plays a dominating role in OER activity of iron nickel oxides. Abstract: In this study, a series of iron nickel oxide (Fe-Ni-Ox ) architectures with different Fe/Ni ratios are synthesized by using corresponding Fe-Ni-based metal-organic frameworks (MOFs) as self-templates for the first time. The characterization on microstructures suggest that Fe/Ni ratio significantly affects the morphology and phase composition of Fe-Ni-Ox architectures. The Fe-rich samples exhibit spindle-like structures while the Ni-rich samples consist of irregular nanoparticle aggregates, and the higher Ni ratio is favorable for the formation of Fe-Ni-spinel strucutre in product. Serving as nonprecious electrocatalysts, the Fe-Ni-Ox architectures exhibit the remarkable electrocatalytic activity toward oxygen evolution reaction (OER) in alkaline medium, which is found to be closely dependent on composition of Fe-Ni-Ox catalysts. The active phase of spinel-structured NiFe2 O4 plays a dominating role in enhancing the electrocatalytic OER activity of the Fe-Ni-Ox architectures. Based on the X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy analysis, the possible OER mechanism of the Fe-Ni-Ox architectures is unraveled as well.