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Probing the material corrosion chemistry at the semiconductor/electrolyte interface for sustainable solar fuel generation

Yu, Weilai and Lewis, Nathan S. (2019) Probing the material corrosion chemistry at the semiconductor/electrolyte interface for sustainable solar fuel generation. In: 257th ACS National Meeting & Exposition, 31 March-4 April 2019, Orlando, FL.

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Stability is one of the crit. aspects that greatly influence the future pathway of large-scale industrial application of integrated solar fuel generators. While a variety III-V semiconductors (GaAs, InP and GaP, etc.) with suitable band gaps can be employed in a tandem light-absorber device design, their material robustness under solar water-splitting conditions (pH=0 or pH=14) always remains a question. Thus, a fundamental and comprehensive understanding over the corrosion chem. of these technol.-important semiconductor materials is urgently required, which should be evaluated at exact conditions for hydrogen/oxygen evolution reactions. Herein, we systematically investigate this sophisticated material corrosion chem. in both strong acidic and basic electrolyte. Various techniques including inductively coupled plasma mass spectroscopy (ICP-MS), scanning electron microscope (SEM), XPS and at.-force microscopy (AFM) are all employed to reveal the phys. and chem. transformations occurring at the semiconductor/electrolyte interface. Combined with theor. considerations of thermodn. pourbaix diagrams, their diverse corrosion behaviors can be understood under varying conditions (under light/dark, with voltage bias/open-circuit, etc.). Eventually, rational strategies are designed to protect these semiconductors from rapid corrosion and achieve prolonged lifetime suitable for practical and sustained solar fuel generation.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Yu, Weilai0000-0002-9420-0702
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2019 American Chemical Society.
Record Number:CaltechAUTHORS:20190325-093202729
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94107
Deposited By: Tony Diaz
Deposited On:25 Mar 2019 16:46
Last Modified:24 Nov 2020 22:54

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