Journal
ADVANCED MATERIALS TECHNOLOGIES
Volume 1, Issue 8, Pages -Publisher
WILEY
DOI: 10.1002/admt.201600119
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Funding
- NTU, MOE Singapore [M401992]
- MOE Singapore [50701006]
- National Basic Research Program [2014CB6433000]
- Chinese Natural Science Foundation [50701006, 51271031]
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Micrometer-sized light-absorbing semiconductor particles (usually prepared by high temperature synthetic techniques) hold the desirable merits of high crystallinity, low concentrations of bulk defects, and a decreased grain boundary density to reduce bulk recombination of photocarriers. However, solar-water-splitting electrodes assembled using them as precursors always produce very low photocurrents. This could be due to the lack of an effective fabrication and/or modification protocol applicable to assemble these micrometer-sized semiconductor particles into suitable electrode configurations. A fast and simple fabrication scheme of drop-casting followed by the necking treatment is developed to enable the micrometer-sized precursor particles derived photoelectrodes to deliver appreciable photocurrent densities (>1 mA cm(-2)). By applying this fabrication scheme, photoelectrodes of solid-state reaction derived Mo doped BiVO4 (approximate to 4 mu m, modified with oxygen evolution catalysts) and commercial WO3 (size ranging from 100 nm to >10 mu m) have yielded photocurrent densities higher than 1 mA cm(-2), while the photoelectrode composed of commercial CdSe (approximate to 10 mu m) is able to produce a photocurrent density higher than 5 mA cm(-2) (in a Na2S aqueous solution). This strategy provides a new possible way, in addition to the predominant route of nanostructuring, to construct efficient solar-water-splitting electrodes.
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