Journal
APPLIED SURFACE SCIENCE
Volume 529, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147030
Keywords
Fishnet-like superstructures; Rough and conductive scaffolds; Ultrafine and ultalong; Electrocatalytic water oxidation
Categories
Funding
- Doctoral Scientific Research Foundation of East China University of Technology [DHBK2018039]
- Project of Educational Commission of Jiangxi Province of China [GJJ180408]
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The water oxidation efficiency driven by electrocatalysts is related to the energy conversion efficiency of water electrolysis and other systems. It is the key to expose active sites as possible, to fully and firmly contact with other components, and to deliver superior conductivity for the development of high-performance electrocatalysts. Herein, we have fabricated self-supporting Ni-MOF electrode containing three-dimensional (3D) fishnet-like superstructures, which are constructed from in-situ growth of amorphous or poor crystalline Ni-MOF nanowire arrays on highly rough and conductive scaffolds of metallic Ni/carbon cloth (Ni-MOF/Ni/CC). The Ni-MOF/Ni/CC electrode delivers an overpotential of 250 mV at the current density of 10 mA cm(-2) (eta(10)). The eta(10) is maintained at 240 mV after a constant current electrolysis for 32 h, which is much smaller than those of Ni-MOF/CC (423 mV) and Ni/CC (281 mV). The superior activity and robust durability can be attributed to the synergistic activating effect of each component in the superstructures with high density of coordination unsaturated active sites, intimate connection and excellent conductivity. This work can provide a new strategy to develop high-efficiency MOFs-based electrocatalysts for electrocatalytic water oxidation.
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