期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 43, 页码 37671-37681出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09449
关键词
photoelectrocatalysis; water splitting; oxygen evolution; electrochemistry; computational chemistry; Prussian blue
资金
- University Jaume I [P11B2014-51]
- Generalitat Valenciana through the Santiago Grisolia Program [2015-031]
- European Union (project ERC StG grant CHEMCOMP) [279313]
- Spanish Ministerio de Economia y Competitividad (MINECO) [CTQ2015-71287-R, CTQ2015-68770-R]
- Severo Ochoa Excellence Accreditation [SEV-2013-0319]
- Generalitat de Catalunya [2014SGR-797, 2014SGR-199]
- CERCA Programme/Generalitat de Catalunya
- LaCaixa-Severo Ochoa International Programme of Ph.D. Scholarships (Programa internacional de Becas LaCaixa-Severo Ochoa)
- European Research Council (ERC) [279313] Funding Source: European Research Council (ERC)
The efficient integration of photoactive and catalytic materials is key to promoting photoelectrochemical water splitting as a sustainable energy technology built on solar power. Here, we report highly stable water splitting photoanodes from BiVO4 photoactive cores decorated with CoFe Prussian blue-type electrocatalysts (CoFe-PB). This combination decreases the onset potential of BiVO4 by,similar to 0.8 V (down to 0.3 V vs reversible hydrogen electrode (RHE)) and increases the photovoltage by 0.45 V. The presence of the catalyst also leads to a remarkable 6-fold enhancement of the photocurrent at 1.23 V versus RHE, while keeping the light-harvesting ability of BiVO4. Structural and mechanistic studies indicate that CoFe-PB effectively acts as a true catalyst on BiVO4. This mechanism, stemming from the adequate alignment of the energy levels, as showed by density functional theory calculations, allows CoFe-PB to outperform all previous catalyst/BiVO4 junctions and, in addition, leads to noteworthy long-term stability. A bare 10-15% decrease in photocurrent was observed after more than 50 h of operation under light irradiation.
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