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Tungsten disulfide thin film/p-type Si heterojunction photocathode for efficient photochemical hydrogen production

  • Ki Chang Kwon (a1) (a2), Seokhoon Choi (a1), Kootak Hong (a1), Dinsefa Mensur Andoshe (a1), Jun Min Suh (a1), Changyeon Kim (a1), Kyoung Soon Choi (a3), Jeong Hyeon Oh (a2), Soo Young Kim (a2) and Ho Won Jang (a1)...

We demonstrate the tungsten disulfide (WS2) thin film catalysts prepared by the sulfurization of vacuum deposited WO3 thin films for efficient hydrogen production with over 90% Faradaic efficiency. The 23-nm-thick WS2 thin film catalyst heterojunction with p-type silicon photocathode could exhibit a photocurrent density of 8.3 mA/cm2 at 0 V versus a reversible hydrogen electrode (RHE), a low onset potential of 0.2 V versus RHE when photocurrent density reaches −1 mA/cm2 and long-term stability over 10 h. The enhanced catalytic activities of WS2/p-Si photocathodes compared with the bare p-Si photocathode originate from a number of edge sites in the synthesized polycrystalline thin films, which could act as hydrogen evolution catalyst.

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Address all correspondence to Soo Young Kim, Ho Won Jang at,
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These authors contributed equally to this work.

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MRS Communications
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