Achieving visible light-driven hydrogen evolution at positive bias with a hybrid copper-iron oxide|TiO2-cobaloxime photocathode

H-2 is an environmentally-friendly fuel that would allow for a circular economy but its sustainable production, e.g. from solar energy and water, remains a challenge. A hybrid CuFexOy|TiO2-CoHEC (CoHEC = chloro([4,4 '-bipyridine]-2,6-dicarboxylic acid)bis(dimethylglyoximato)cobalt(iii)) photocathode for hydrogen evolution reaction (HER), with faradaic efficiencies of 54-88%, is described, the preparation of which uses only non-toxic and Earth-abundant elements, avoids etching treatments and limits the use of organic solvents. The semi-conducting CuFexOy light absorber is obtained by sol-gel synthesis followed by calcination at moderate temperature. Grafting the CoHEC cobaloxime catalyst at its surface results in H-2 evolution with an onset photocurrent potential of +860 mV; this process being stabilized by the presence of a thin layer of amorphous TiO2 deposited onto CuFexOy.


Published in:
Green Chemistry, 22, 10, 3141-3149
Year:
May 21 2020
Publisher:
Cambridge, ROYAL SOC CHEMISTRY
ISSN:
1463-9262
1463-9270
Keywords:
Laboratories:




 Record created 2020-06-20, last modified 2020-06-22


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