气候变化领域集成服务门户(CCPortal): Optical and electrochemical effects of H2and O2bubbles at upward-facing Si photoelectrodes

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DOI	10.1039/d0ee02796k
	Optical and electrochemical effects of H2and O2bubbles at upward-facing Si photoelectrodes
	Kempler P.A.; Ifkovits Z.P.; Yu W.; Carim A.I.; Lewis N.S.
发表日期	2021
ISSN	17545692
起始页码	414
结束页码	423
卷号	14 期号:1
英文摘要	The effects of the size, contact-angle, and coverage of gas bubbles on solar fuels devices were characterized at cm-scale, upward-facing planar and microwire-array Si photoelectrodes in stagnant electrolytes. Experimental measurements were supported by ray-tracing simulations of surface attached gas bubble films. A dilute, redox-active tracer allowed for the quantification of the mass-transport effects of bubble coverage during photoanodic O2(g) evolution at upward-facing photoanodes in 1.0 M KOH(aq.). Measurements of the gas coverage at upward-facing p-Si photocathodes in 0.50 M H2SO4(aq.) allowed for the nucleation rate and contact angle of H2(g) bubbles to be evaluated for systems having various surface free energies. Under simulated solar illumination, the rapid departure of small O2(g) bubbles produced stable photocurrents at upward-facing oxygen-evolving Si photoanodes and yielded increased mass-transport velocities relative to a stagnant electrolyte, indicating that bubbles can provide a net benefit to the photoelectrochemical performance of an upward-facing photoanode in solar fuels devices. © The Royal Society of Chemistry.
英文关键词	Bubbles (in fluids); Contact angle; Electrolytes; Field emission cathodes; Photocurrents; Potassium hydroxide; Redox reactions; Silicon; Sulfuric acid; Electrochemical effects; Photo-electrodes; Photoelectrochemical performance; Ray tracing simulation; Solar illumination; Surface free energy; Transport effects; Transport velocity; Facings; electrochemical method; electrode; experimental study; hydrogen; nucleation; optical method; oxygen; silicon
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/190824
作者单位	Division of Chemistry and Chemical Engineering, 127-72, 210 Noyes Laboratory, California Institute of Technology, Pasadena, CA 91125, United States; Beckman Institute, California Institute of Technology, Pasadena, CA 91125, United States
推荐引用方式 GB/T 7714	Kempler P.A.,Ifkovits Z.P.,Yu W.,et al. Optical and electrochemical effects of H2and O2bubbles at upward-facing Si photoelectrodes[J],2021,14(1).
APA	Kempler P.A.,Ifkovits Z.P.,Yu W.,Carim A.I.,&Lewis N.S..(2021).Optical and electrochemical effects of H2and O2bubbles at upward-facing Si photoelectrodes.Energy & Environmental Science,14(1).
MLA	Kempler P.A.,et al."Optical and electrochemical effects of H2and O2bubbles at upward-facing Si photoelectrodes".Energy & Environmental Science 14.1(2021).