Morphology regulation of metal–organic framework-derived nanostructures for efficient oxygen evolution electrocatalysis. Issue 35 (26th August 2020)

• Record Type: Journal Article
• Authors: Li, Yuwen; Lu, Mengting; Wu, Yuhang; Ji, Qinghong; Xu, Hui; Gao, Junkuo; Qian, Guodong; Zhang, Qichun
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 35(2020)
• Page Start: 18215
• Page End: 18219
• Publication Date: 2020-08-26
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta05866a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A series of morphology-regulated oxygen-evolution electrocatalysts including nanosheets, nanoflowers, nanotubes and aggregations derived from Hofmann-type metal–organic frameworks have been developed and demonstrated efficient catalytic properties. Abstract : Understanding the relationship between the morphology of the metal–organic framework-derived nanostructures and their performance as catalysts in the oxygen evolution reaction (OER) is very important and highly desirable, because such a study would provide a new insight into the systematic regulation of the catalyst morphology for performance enhancement in electrocatalysis and photocatalysis. Here, a series of accurately morphology-regulated electrocatalysts (including nanosheets, nanoflowers, nanotubes and aggregations) derived from Hofmann-type metal–organic frameworks (MOFs) are reported for efficient OER. Among all the nanostructures, FeNi nanosheets show the best OER catalytic performance in alkaline media, achieving a low overpotential of 248 mV at 10 mA cm −2, an ultra-small Tafel slope of 31.2 mV dec −1 and a satisfactory stability, greatly outperforming the commercial RuO2 catalyst. The reason is that FeNi nanosheets possess optimized conductivity, oxygen vacancies and N-related active sites. Our research also demonstrates that electron transfer can be achieved through the precise control of the morphology of precursor MOFs.