Nickel-selenide templated binary metal–organic frameworks for efficient water oxidation. Issue 33 (10th August 2020)

• Record Type: Journal Article
• Authors: Xu, Suxian; Du, Jian; Li, Jiayuan; Sun, Licheng; Li, Fei
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 33(2020)
• Page Start: 16908
• Page End: 16912
• Publication Date: 2020-08-10
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta00785d
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Highly conductive NiSe x NSs as a half self-sacrificial template and conductive support for preparation of three-dimensional hierarchical NiFe-MOF/NiSe x /NF. Abstract : The development of highly active and stable non-precious metal electrocatalysts is of great significance for energy conversion with the oxygen evolution reaction (OER) being a rate-determining step. Herein, we report a hybrid material bearing a three-dimensional (3D) core–shell hierarchical structure, in which binary metal–organic framework nanosheets (NiFe-MOF NSs) are rationally decorated on NiSe x nanosheet (NS) arrays supported on Ni foam (NF). With this approach, the highly conductive NiSe x NSs ensure rapid charge transfer, the NiFe-MOF NSs provide a large number of exposed active sites, and the 3D hierarchical structure benefits gas release and electrolyte diffusion. As a result the NiFe-MOF/NiSe x /NF electrode delivers current densities of 10 and 100 mA cm −2 at overpotentials of 198 and 230 mV and reveals a low Tafel slope of 30.6 mV dec −1 toward the OER. When NiFe-MOF/NiSe x /NF was used as both the anode and cathode for overall water splitting, the potential to deliver a current density of 10 mA cm −2 was 1.59 V, lower than that for the benchmark IrO2 /NF(+)‖Pt/C/NF(−) system (1.66 V at 10 mA cm −2 ).