Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 33, Pages 15068-15072Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp904022e
Keywords
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Funding
- XRD
- TEM
- Helios Solar Energy Research Center
- Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC0205CH11231]
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Cubic Co3O4 nanoparticles with average diameters of 5.9, 21.1, and 46.9 nm (hereafter small, medium, and large) have been synthesized and characterized by pXRD, TEM, and BET. The nanoparticles were loaded onto Ni foam supports for evaluation as anodes for water electrolysis in 1.0 M KOH. Current densities of 10 mA/cm(2) were achieved at overpotentials of 328, 363, and 382 mV for anodes loaded with 1 mg/cm(2) of small, medium, and large sized Co3O4 nanoparticles, respectively. The activity correlates with the BET surface area of the isolated particles. A plot of the electrochemical overpotential at 10 mA/cm(2) against the log of the BET surface area gives a linear relation with a slope of -47 +/- 7 mV/dec, showing unequivocally that the activity increase is a function of accessible catalyst surface area.
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