Journal
APPLIED SURFACE SCIENCE
Volume 510, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145484
Keywords
Cellulose nanofibrils; CoFe nanoparticles; Well-aligned arrangement; Exposing active sites; High performance
Categories
Funding
- National Natural Science Foundation of China [31890771]
- Young Elite Scientists Sponsorship Program from National Forestry and Grassland Administration of China [2019132614]
- Hunan Provincial Technical Innovation Platform and Talent Program in Science and Technology [2018RS3092, 2018WK4028, 2016TP1013]
- Outstanding Innovative Youth Training Program of Changsha [KQ1905060]
- Hunan Provincial Research Learning and Innovative Plan for College Students [201810538009]
- National Innovation and Entrepreneurship Program for College Students [201810538008]
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Searching for specific methods to make better use of the existing catalysts plays a significant role in achieving superior electrocatalytic performance. Herein, cellulose nanofibrils (CNF), featuring abundant carboxyls and hydroxyls, was employed to deposit cobalt (Co2+) and iron (Fe3+) ions. The Co2+ and Fe3+ ions were dispersed homogeneously and avoided idiopathic aggregation. The generated CoFe nanoparticles were in a well-aligned arrangement on the CNF nanocarbon. Benefiting from this unique structure, active sites were exposed and their catalytic ability was released fully. As a result, the overpotential of the as-synthesized CoFe nanoparticles catalyst (Fe-CoS/NC) was 257 mV to deliver a current density of 10 mA cm(-2) with a Tafel slope of 46.7 mV dec(-1) in 1.0 M KOH electrolyte, outperforming the commercial RuO2 remarkably. The Fe-CoS/NC catalyst exhibited excellent stability, which the overpotential to deliver a current density of 10 mA cm(-2) was only increased by 2.82% after 50 h chronopotentiometry measurement. The nanocarbon framework derived from CNF can not only induce the CoFe nanoparticels into a well-aligned arrangement to fully expose active sites, but also promote the transfer of electrons remarkably, providing a versatile platform for the structural design and a novel strategy to boost OER activity.
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