Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 45, Issue 10, Pages 15544-15556Publisher
WILEY
DOI: 10.1002/er.6799
Keywords
cellulose; nickel; nickel oxide; oxygen evolution reaction
Categories
Funding
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University [ACGM2016-06-02, ACGM2016-06-03]
- Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education [ARES-2018-09]
- National Natural Science Foundation of China [21706010, 22078027]
- Natural Science Foundation of Jiangsu Province of China [BK20161200]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Reduction of NiO to obtain highly active OER catalyst CL-prNiO through hydrothermal method is able to significantly enhance the OER activity due to its hybrid and disordered structure.
Water splitting driven by renewable energy represents a sustainable way to store clean energy. However, its efficiency is limited by the kinetically sluggish oxygen evolution reaction (OER), calling for highly active catalysts to accelerate the reaction rate. Herein, NiO is reduced by cellulose through a hydrothermal method to obtain the highly active OER catalysts. The obtained cellulose-partially-reduced-NiO (CL-prNiO) shows a hybrid structure, composed of 3.6 wt.% face-centered cubic (fcc) Ni and 96.4 wt.% rock salt structured NiO with highly disordered interface. The CL-prNiO delivers a current density of 10 mA cm(-2) with an overpotential of 288 mV, which is comparable to the commercial RuO2 and outperforms many of the recently reported Ni-NiO based OER catalysts. As benefited from the hybrid and disordered structure, CL-prNiO shows great ability of converting Ni2+ to Ni3+ at a potential prior to the OER onset. The in situ generated Ni3+ species can activate the lattice oxygen in the unreduced NiO of CL-prNiO, significantly boosting the OER activity.
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