Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 296, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120313
Keywords
Energy conversion; Interfacial modulation; Hole transfer; Photoelectrochemistry; Water splitting
Funding
- National Natural Science Foundation of China [21575115, 22001193]
- Program for Chang Jiang Scholars and Innovative Research Team, Ministry of Education, China [IRT16R61]
- Program of Gansu Provincial Higher Education Research Project [2017D01]
- Special Fund Project for the Central Government to Guide Local Science and Technology Development
- Program of Tianjin Science and Technology Major Project and Engineering [19ZXYXSY00090]
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This study presents a novel multi-step hole transfer strategy to accelerate hole transport and suppress surface recombination, by constructing an effective hole transfer channel to enhance the performance of photoanodes.
Serious surface recombination and sluggish reaction kinetics hamper the photoelectrochemical (PEC) performance from being efficient. Although coupling oxygen evolution catalysts on photoanodes to accelerate electrode reactions has been demonstrated an effective strategy to enhance photocurrent, the surface recombination still limits the performance to an ideal level. Herein, a novel multi-step hole transfer strategy is developed for accelerating hole transport and thus suppressing the surface recombination. In this system, porphyrin and polyaniline both act as hole transfer layers, which construct an effective stair-stepping hole transfer channel to ensure much more holes take part in water oxidation process. This simple interface modulation system exhibits a remarkable photocurrent of 4.5 mA cm-2 at 1.23 V (vs. reversible hydrogen electrode (RHE), AM 1.5 G illumination) accompanied with good stability and provides a promising strategy for the design of efficient photoanodes for solar conversion.
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