Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 13, Pages 10089-10098Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am500988p
Keywords
metal-carbon nanotubes hybrids; one-pot synthesis; arc-discharge; chemical vapor deposition; oxygen evolution reaction; alkaline water electrolysis
Funding
- Australian Research Council [DP120104932]
- University Government
- State Government
- Commonwealth Government
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Oxygen evaluation reaction (OER) is the most important reaction in hydrogen production from water splitting. Here we developed metal-carbon nanotubes (M-CNTs) hybrids with high metal oxide catalyst loading synthesized by arc-discharge and chemical vapor deposition (CVD) methods as electrocatalysts for OER in alkaline solutions. The M-CNTs hybrids produced by arc-discharge (M-CNTs-Arc) and CVD (M-CNTs-CVD) exhibit a core-shell-like structure, in which metal nanoparticles (NPs) encapsulated by graphite shells are connected by carbon nanotubes (CNTs), forming M-CNTs network hybrids. M-CNTs-Arc has NiCo0.16Fe0.34 metal core and shows very high activity and superior stability for OER, achieving 100 A g(-1) at an overpotential (eta) of 0.29 V and 500 A g(-1) at eta = 0.37 V in 1 M KOH solution. This is probably the highest activity reported for OER in alkaline solutions. The reaction follows the first-order kinetics with respect to OH- concentration and Tafel slope of 34 mV dec(-1). The results demonstrate a highly efficient, scalable, and lowcost one-step synthesis method for developing highly active and stable catalysts for electrochemical water splitting in alkaline solutions.
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