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Laser‐Assisted Doping and Architecture Engineering of Fe 3 O 4 Nanoparticles for Highly Enhanced Oxygen Evolution Reaction
Author(s) -
Cai Mingyong,
Pan Rui,
Liu Weijian,
Luo Xiao,
Chen Changhao,
Zhang Hongjun,
Zhong Minlin
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201901020
Subject(s) - oxygen evolution , tafel equation , overpotential , materials science , nanoparticle , dopant , water splitting , catalysis , chemical engineering , nanotechnology , oxide , doping , inorganic chemistry , photocatalysis , electrochemistry , chemistry , optoelectronics , organic chemistry , electrode , engineering , metallurgy
The design and synthesis of cost‐effective and highperformance oxygen evolution reaction (OER) electrocatalysts for water splitting based on earth‐abundant elements is urgent but challenging. A synergistic doping and architecture engineering strategy by nanosecond laser ablation is used to generate a unique kind of highly disordered Ni‐doped Fe 3 O 4 nanoparticle clusters. Ni dopant and increased oxygen vacancies are simultaneously incorporated into Fe 3 O 4 frameworks and thereby modulate the electronic configuration for an optimal binding affinity towards OER intermediates. Nanoparticles with average size of around 5 nm assemble randomly during laser ablation and construct a fluffy and porous architecture, which not only optimizes the number of exposed active sites but also accelerates mass transfer. Consequently, Ni‐doped Fe 3 O 4 clusters are revealed as a superior OER catalyst with a small overpotential of 272 mV at 10 mA cm −2 and a small Tafel slope of 39.4 mV dec −1 , surpassing almost all spinel Fe‐based OER catalysts. This work provides a new strategy to fabricate advanced cation‐doped metal oxide nanostructures for related energy applications.