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Ti/Co-S Catalysts Covered Amorphous Silicon Based Photocathodes with High Photovoltage for Hydrogen Evolution Reaction in Non-Acid Environment

Abstract

Making highly efficient photoelectrode for a photoelectrochemical (PEC) water splitting reaction is vitally important to bring solar/electrical-to-hydrogen energy conversion processes into reality. Meanwhile, the active and stable catalysts in the photoelectrode are the key component in PEC devices. Although most of hydrogen evolution catalysts exhibit excellent performance in acid solution, the earth abundant oxygen evolution catalysts are generally unstable. Therefore, elaborate design of highly active and stable photocathodes possessing great onset potential in non-acid environment are imperative. Here, we report that the magnetron sputtering and electrochemical-deposition preparation methods are compatible with photoabsorbers for depositing titanium(Ti)/cobalt-sulfide(Co-S) catalyst on amorphous silicon/amorphous silicon (a-Si/a-Si) tandem solar cell,realizing a stable, low-cost, and efficient photocathode for water splitting in non-acid solutions. This photocathode exhibits high photocurrent onset potential of 1.78 V vs. reversible hydrogen electrode (RHE) in alkaline and neutral electrolyte, the photocurrent of 6.34 mA/cm2 at 0 V vs. RHE. The facile preparation of highly active a-Si/a-Si/Ti/Co-S photocathode paves the way to integrating them into various oxygen evolution catalyst for developing highly efficient, low-cost, and monolithic PEC solar-water-splitting devices.

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Publication details

The article was received on 30 Oct 2017, accepted on 06 Dec 2017 and first published on 07 Dec 2017


Article type: Communication
DOI: 10.1039/C7TA09569D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Ti/Co-S Catalysts Covered Amorphous Silicon Based Photocathodes with High Photovoltage for Hydrogen Evolution Reaction in Non-Acid Environment

    Q. Zhang, T. Li, J. Luo, B. Liu, J. Liang, N. Wang, X. Kong, B. Li, C. Wei, Y. Zhao and X. Zhang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA09569D

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