Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 10, Pages 9523-9527Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c01904
Keywords
Photoelectrochemical water splitting; bismuth vanadate; photocorrosion; illuminated scanning flow cell; aberration-corrected electron microscopy; atom probe tomography
Funding
- German Research Foundation (DFG)
- Alexander von Humboldt Foundation [ERC-CoG-SHINE-771602]
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Photoelectrochemical water splitting is a promising route to produce hydrogen from solar energy. However, corrosion of photoelectrodes remains a fundamental challenge for their implementation. Here, we reveal different dissolution behaviors of BiVO4 photoanode in pH-buffered borate, phosphate, and citrate (hole-scavenger) electrolytes, studied in operando employing an illuminated scanning flow cell. We demonstrate that decrease in photocurrents alone does not reflect the degradation of photoelectrodes. Changes in dissolution rates correlate to the evolution of surface chemistry and morphology. The correlative measurements on both sides of the liquid- semiconductor junction provide quantitative comparison and mechanistic insights into the degradation processes.
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