https://scholars.lib.ntu.edu.tw/handle/123456789/575827
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.author | CHIH-JUNG CHEN | en_US |
dc.contributor.author | Yang K.-C | en_US |
dc.contributor.author | Liu C.-W | en_US |
dc.contributor.author | Lu Y.-R | en_US |
dc.contributor.author | Dong C.-L | en_US |
dc.contributor.author | Wei D.-H | en_US |
dc.contributor.author | Hu S.-F | en_US |
dc.contributor.author | Liu R.-S. | en_US |
dc.contributor.author | RU-SHI LIU | zz |
dc.creator | Chen C.-J;Yang K.-C;Liu C.-W;Lu Y.-R;Dong C.-L;Wei D.-H;Hu S.-F;Liu R.-S. | - |
dc.date.accessioned | 2021-08-03T01:43:23Z | - |
dc.date.available | 2021-08-03T01:43:23Z | - |
dc.date.issued | 2017 | - |
dc.identifier.issn | 22112855 | - |
dc.identifier.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008600512&doi=10.1016%2fj.nanoen.2016.12.045&partnerID=40&md5=f0c8f09f290abbffc70045a10e58a96b | - |
dc.identifier.uri | https://scholars.lib.ntu.edu.tw/handle/123456789/575827 | - |
dc.description.abstract | Silicon 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 sulfur-terminated 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. ? 2017 Elsevier Ltd | - |
dc.relation.ispartof | Nano Energy | - |
dc.subject | Catalyst activity; Catalysts; Doping (additives); Energy gap; Field emission cathodes; Hydrogen production; Molybdenum; Molybdenum compounds; Nickel; Photocathodes; Silicon; Solar power generation; Sulfur compounds; Surface treatment; X ray absorption spectroscopy; Co catalysts; Molybdenum sulfide; Silicon microwire; Solar hydrogen; Water splitting; Amorphous silicon | - |
dc.subject.classification | [SDGs]SDG7 | - |
dc.subject.other | Catalyst activity; Catalysts; Doping (additives); Energy gap; Field emission cathodes; Hydrogen production; Molybdenum; Molybdenum compounds; Nickel; Photocathodes; Silicon; Solar power generation; Sulfur compounds; Surface treatment; X ray absorption spectroscopy; Co catalysts; Molybdenum sulfide; Silicon microwire; Solar hydrogen; Water splitting; Amorphous silicon | - |
dc.title | Silicon microwire arrays decorated with amorphous heterometal-doped molybdenum sulfide for water photoelectrolysis | en_US |
dc.type | journal article | en |
dc.identifier.doi | 10.1016/j.nanoen.2016.12.045 | - |
dc.identifier.scopus | 2-s2.0-85008600512 | - |
dc.relation.pages | 422-432 | - |
dc.relation.journalvolume | 32 | - |
item.cerifentitytype | Publications | - |
item.fulltext | no fulltext | - |
item.openairecristype | http://purl.org/coar/resource_type/c_6501 | - |
item.openairetype | journal article | - |
item.grantfulltext | none | - |
crisitem.author.dept | Program in Nanoengineering and Nanoscience | - |
crisitem.author.dept | Chemistry | - |
crisitem.author.orcid | 0000-0002-3309-7908 | - |
crisitem.author.orcid | 0000-0002-1291-9052 | - |
crisitem.author.parentorg | Graduate School of Advanced Technology | - |
crisitem.author.parentorg | College of Science | - |
顯示於: | 化學系 |
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