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dc.contributor.authorChen, Chih-Jungen_US
dc.contributor.authorYang, Kai-Chihen_US
dc.contributor.authorLiu, Chi-Weien_US
dc.contributor.authorLu, Ying-Ruien_US
dc.contributor.authorDong, Chung-Lien_US
dc.contributor.authorWei, Da-Huaen_US
dc.contributor.authorHu, Shu-Fenen_US
dc.contributor.authorLiu, Ru-Shien_US
dc.date.accessioned2018-08-21T05:53:26Z-
dc.date.available2018-08-21T05:53:26Z-
dc.date.issued2017-02-01en_US
dc.identifier.issn2211-2855en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.nanoen.2016.12.045en_US
dc.identifier.urihttp://hdl.handle.net/11536/144697-
dc.description.abstractSilicon is a promising photocathode material for solar hydrogen evolution because of its small band gap, negative conduction band position, and ideal theoretical current density. In this study, p-type Si microwire (p-Si MW) arrays were prepared as photocathodes because of the large surface area and high light-harvesting capability. However, Si MWs suffered from low photocatalytic activity because of slow photo-induced carriers during driving of water-splitting reaction. Therefore, molybdenum sulfide (MoS2) with appropriate band alignment with p-Si material was employed for surface modification to function as a co-catalyst for collecting photo-generated minority carriers and reducing recombination possibility. The onset potential and current density at 0 V versus reversible hydrogen electrode (RHE) of Si@MoS2 MWs were + 0.122 V and -8.41 mA cm(-2). Heterometal atoms were employed to dope MoS2 co-catalyst and expose more sulfurterminated active sites to further boost photoelectrochemical performance. Optimal activity of Si@MMoSx (M = Fe, Co, Ni) was achieved by doping Co heteroatoms, and its turn-on voltage and photocurrent density at 0 V (vs. RHE) were respectively increased to + 0.192 V and -17.2 mA cm(-2). X-ray absorption spectroscopy was applied to demonstrate that Fe ions of FeMoSx were dichalcogenide materials, forming a composite with MoS2 and contributing better photoelectrolytic efficiency. By contrast, two-valent heteroatoms of CoMoSx and NiMoSx substituted the Mo4+ ions in MoS2. For charge compensation, more defects and edges were revealed as active sites of solar hydrogen production by adding Co or Ni dopants in MoS2 co-catalyst, which led to lower overpotential.en_US
dc.language.isoen_USen_US
dc.subjectWater splittingen_US
dc.subjectCo-catalysten_US
dc.subjectMolybdenum sulfideen_US
dc.subjectSilicon microwire arrayen_US
dc.subjectSolar hydrogen evolutionen_US
dc.titleSilicon microwire arrays decorated with amorphous heterometal-doped molybdenum sulfide for water photoelectrolysisen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.nanoen.2016.12.045en_US
dc.identifier.journalNANO ENERGYen_US
dc.citation.volume32en_US
dc.citation.spage422en_US
dc.citation.epage432en_US
dc.contributor.department加速器光源科技與應用學位學程zh_TW
dc.contributor.departmentMaster and Ph.D. Program for Science and Technology of Accelrrator Light Sourceen_US
dc.identifier.wosnumberWOS:000397003700052en_US
Appears in Collections:Articles