Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202100405
Keywords
charge separation; photoelectrochemical; surface plasmon resonance; surface reactions; transition‐ metal hydroxide
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Funding
- National Natural Science Foundation of China [21575115, 22001193]
- Special fund project for the central government to guide local science and technology development (2020)
- Program for Chang Jiang Scholars and Innovative Research Team, Ministry of Education, China [IRT-16R61]
- Program of Gansu Provincial Higher Education Research Project [2017-D-01]
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Coating photoanodes with transition-metal hydroxides (TMH) is a promising approach for improving photoelectrochemical (PEC) water oxidation. Effective charge separation and enhanced surface catalysis dynamics are achieved through decoration of plasmon metal (Ag) in a semiconductor/TMH coupling system for PEC water splitting. The study provides a guiding design method for solar energy conversion with the semiconductor-TMH system, demonstrating the universality of the approach.
Coating photoanodes with transition-metal hydroxides (TMH) is a promising approach for improving photoelectrochemical (PEC) water oxidation. However, the present system still suffers from high charge recombination and sluggish surface reactions. Herein, effective charge separation is achieved at the same time as boosting the surface catalytic reaction for PEC water splitting through decoration of plasmon metal (Ag) in a semiconductor/TMH coupling system. The kinetic behavior at the semiconductor/TMH and TMH/electrolyte interfaces is systematically evaluated by employing intensity modulated photocurrent spectroscopy, scanning photoelectrochemical microscopy, and oxygen evolution reaction model. It is found that both charge transfer and surface catalysis dynamics are enhanced through local surface plasmon resonance of Ag nanoparticles. The as-prepared BiVO4/Co(OH)(x)-Ag exhibits remarkable activity (approximate to 4.64 times) in PEC water splitting in comparison with pure BiVO4. Notably, this smart approach can be also applied to other TMH (Ni(OH)(2)), reflecting its universality. This work provides a guiding design method for solar energy conversion with the semiconductor-TMH system.
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