Pt-free NiCo electrocatalysts for oxygen evolution by seawater splitting

•NiCo alloys are synthesized by using organic solvents as reducing agents.•Organic solvents such as DEA, PG, ETA and MEG are optimized for NiCo preparation.•NiCo alloy electrocatalysts are prepared for OER from seawater splitting.•The resultant NiCo electrodes are robust and stable for seawater spli...

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Bibliographic Details
Published in:Electrochimica acta 2017-09, Vol.247, p.381-391
Main Author: Zheng, Jingjing
Format: Article
Language:English
Subjects:
Alloy electrocatalyst
Alloys
Catalysis
Electrocatalysis
Electrocatalysts
Electron transfer
Optimization
Oxygen
Oxygen evolution reaction
Oxygen evolution reactions
Pt-free electrode
Seawater
Seawater splitting
Studies
Water splitting
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Summary:•NiCo alloys are synthesized by using organic solvents as reducing agents.•Organic solvents such as DEA, PG, ETA and MEG are optimized for NiCo preparation.•NiCo alloy electrocatalysts are prepared for OER from seawater splitting.•The resultant NiCo electrodes are robust and stable for seawater splitting. Creation of robust and cost-effective electrocatalysts is a persistent objective for high-efficiency oxygen evolution from water splitting. I present here the one-step hydrothermal synthesis of a category of Pt-free NiCo alloy electrocatalysts assisted by a reduction process with diethanolamine, propanediol, ethanolamine or mono-ethylene gloycol. By optimizing assistant solvent species, the catalytic performances toward oxygen evolution reaction (OER) in seawater are maximized. The resultant NiCo electrocatalysts are featured with low onset overpotentials and large current densities for OER from seawater splitting. The large heterogeneous electron transfer rate constant (Koeff) and turnover frequency (TOF) suggest robust catalytic behaviors toward OER in real seawater. Additionally, the reasonable long-term stability of the optimal NiCo alloy electrode over 40h in seawater further demonstrates that it is promising for oxygen evolution from splitting seawater.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.07.024