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Natural‐Cellulose‐Nanofibril‐Tailored NiFe Nanoparticles for Efficient Oxygen Evolution Reaction
Author(s) -
Tian Cuihua,
Liu Zhichen,
Wu Yiqiang,
Lu Xihong,
Yang Tianyun,
Tao Xu,
Qing Yan
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900738
Subject(s) - tafel equation , overpotential , catalysis , oxygen evolution , materials science , chemical engineering , cellulose , nanoparticle , electrolyte , wetting , graphene , nanotechnology , electrochemistry , chemistry , electrode , composite material , organic chemistry , engineering
High performance, resource abundance, and environmental friendliness have been raising as major challenges for the next‐generation of affordable and sustainable electrocatalysts. Herein, natural cellulose nanofibrils (CNFs) with abundant carboxyls and hydroxyls were employed to tailor NiFe catalysts (NiFeNSC) for the efficient oxygen evolution reaction (OER). Benefiting from the introduction of CNF, the NiFe metal ions were homogeneously dispersed on the CNF surface and exhibited a smaller particle size. Additionally, the surface area was 3.17 times larger and the surface wettability was significantly improved. By integrating the active NiFe nanoparticles with doped CNF, the overpotential of synthesized NiFeNSC catalyst was decreased from 370 mV to 244 mV to deliver a current density of 10 mA cm −2 , and exhibited a small Tafel slope of 43.3 mV dec −1 in 1.0 M KOH electrolyte. Impressively, the NiFeNSC displayed excellent long‐term stability, which was only 38 mV increased over 24 h chronopotentiometry measurement, outperforming the catalyst without CNF (NiFeNS) and commercial RuO 2 catalyst remarkably. The present results demonstrate a new avenue for designing resource abundant and sustainable electrocatalysts, providing a novel strategy to replace the fossil‐involved nanocarbon.