气候变化领域集成服务门户(CCPortal): Near-complete suppression of surface losses and total internal quantum efficiency in BiVO4 photoanodes

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DOI	10.1039/c6ee03677e
	Near-complete suppression of surface losses and total internal quantum efficiency in BiVO4 photoanodes
	Trześniewski B.J.; Digdaya I.A.; Nagaki T.; Ravishankar S.; Herraiz-Cardona I.; Vermaas D.A.; Longo A.; Gimenez S.; Smith W.A.
发表日期	2017
ISSN	17545692
起始页码	1517
结束页码	1529
卷号	10 期号:6
英文摘要	Bismuth vanadate (BiVO4) is one of the most efficient light absorbing metal oxides for solar water splitting. BiVO4 photoanodes immersed in an electrolyte in an open circuit configuration and exposed to simulated solar illumination for prolonged time achieve superior photoelectrochemical (PEC) activity. This photocharging (PC) effect is capable of almost completely overcoming the surface and bulk limitations of BiVO4. Herein we show that alkaline conditions favor the PC effect; specifically BiVO4 photoanodes subjected to PC treatment at pH 10 achieve a record high photocurrent for undoped and uncatalyzed BiVO4 of 4.3 mA cm-2 @ 1.23 VRHE, an outstandingly low onset potential of 0.25 VRHE, and a very steep photocurrent onset. Alkaline conditions also facilitate excellent external and internal quantum efficiencies of 75 and 95% respectively (average in the 440 nm > λ > 330 nm range). Moreover, impedance spectroscopy and in situ XAS study suggest that electronic, structural and chemical properties of the bulk of these films remain unchanged during the PC treatment. However, appreciable changes in the surface-related properties take place. Ultimately, our results indicate that the improved activity of PC-BiVO4 is enhanced by surface reaction pathways of the semiconductor-liquid junction, which is directly correlated with the electrochemical environment in which it is modified. © The Royal Society of Chemistry 2017.
英文关键词	Alkalinity; Efficiency; Electrolytes; Photoelectrochemical cells; Semiconductor junctions; Surface reactions; Alkaline conditions; Electrochemical environments; Impedance spectroscopy; Improved activities; Internal quantum efficiency; Photoelectrochemicals; Solar water splitting; Surface-related properties; Quantum efficiency; bismuth; electrochemical method; electrode; electrolyte; pH; photochemistry; quantum mechanics
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190464
作者单位	Delft University of Technology, Faculty of Applied Sciences, Department of Chemical Engineering, Materials for Energy Conversion and Storage (MECS), Van der Maasweg 9, Delft, 2629 HZ, Netherlands; Universitat Jaume I, Institute of Advanced Materials (INAM), Av. de Vicent Sos Baynat, s/n, Castelló de la Plana, 12071, Spain; Netherlands Organization for Scientific Research (NWO), European Synchrotron Radiation Facility (ESRF), CS40220, Grenoble Cedex 9, 38043, France; ISMN-CNR, UOS Palermo, Via Ugo La Malfa, 153, Palermo, 90146, Italy
推荐引用方式 GB/T 7714	Trześniewski B.J.,Digdaya I.A.,Nagaki T.,et al. Near-complete suppression of surface losses and total internal quantum efficiency in BiVO4 photoanodes[J],2017,10(6).
APA	Trześniewski B.J..,Digdaya I.A..,Nagaki T..,Ravishankar S..,Herraiz-Cardona I..,...&Smith W.A..(2017).Near-complete suppression of surface losses and total internal quantum efficiency in BiVO4 photoanodes.Energy & Environmental Science,10(6).
MLA	Trześniewski B.J.,et al."Near-complete suppression of surface losses and total internal quantum efficiency in BiVO4 photoanodes".Energy & Environmental Science 10.6(2017).