Full metadata record
DC Field | Value | Language |
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dc.contributor.author | Kim, Seonghun | - |
dc.contributor.author | Park, Yiseul | - |
dc.contributor.author | Kim, Wooyul | - |
dc.contributor.author | Park, Hyunwoong | - |
dc.date.available | 2017-07-11T05:41:39Z | - |
dc.date.created | 2017-04-10 | - |
dc.date.issued | 2016 | - |
dc.identifier.issn | 1474-905X | - |
dc.identifier.uri | http://hdl.handle.net/20.500.11750/2786 | - |
dc.description.abstract | CdS and WO3 (CdS/WO3) bilayer film electrodes are fabricated to harness solar visible light (λ > 420 nm) and store photogenerated electrons for possible use during periods of unavailable sunlight. The overall film thickness is approximately 50-60 μm, while the CdS underlayer is slightly thinner than WO3 owing to a packing effect. The energetics of CdS and WO3 determined by optical and electrochemical analyses enables cascaded electron transfer from CdS to WO3. The open circuit potential (EOCP) of CdS/WO3 under visible light (approximately -0.35 V vs. SCE) is nearly maintained even in the absence of light, with a marginal decrease (∼0.15 V) in ∼20 h of darkness. Neither CdS nor WO3 alone exhibits such behavior. The electron lifetimes (τ) of CdS and WO3 are each less than 100 s, whereas coupling of the two increases τ to ∼2500 s at the EOCP. In the absence of dissolved O2, τ further increases, suggesting that O2 is the primary electron acceptor. In spite of oxic conditions, CdS/WO3 is capable of continuously reducing Cr6+ to Cr3+ and Ag+ to Ag0 after removal of visible light. The number of utilized (i.e., stored) electrons in the reductions of Cr6+ and Ag+ are estimated to be ∼1.08 × 1017 and ∼0.87 × 1017, respectively. The primary role of CdS is to be a visible-light absorber in the 420-565 nm wavelength range, transferring the photogenerated electrons to WO3. The electrons stored in WO3 are gradually released to electron acceptors with suitable redox potentials. © The Royal Society of Chemistry and Owner Societies 2016. | - |
dc.publisher | Royal Society of Chemistry | - |
dc.title | Harnessing and storing visible light using a heterojunction of WO3 and CdS for sunlight-free catalysis | - |
dc.type | Article | - |
dc.identifier.doi | 10.1039/c6pp00091f | - |
dc.identifier.scopusid | 2-s2.0-84982747255 | - |
dc.identifier.bibliographicCitation | Photochemical and Photobiological Sciences, v.15, no.8, pp.1006 - 1011 | - |
dc.subject.keywordPlus | BiVO4 | - |
dc.subject.keywordPlus | CO2 | - |
dc.subject.keywordPlus | COPPER | - |
dc.subject.keywordPlus | ENERGY-STORAGE | - |
dc.subject.keywordPlus | NANOPARTICLES | - |
dc.subject.keywordPlus | Photosynthesis | - |
dc.subject.keywordPlus | SYSTemS | - |
dc.subject.keywordPlus | WATER | - |
dc.citation.endPage | 1011 | - |
dc.citation.number | 8 | - |
dc.citation.startPage | 1006 | - |
dc.citation.title | Photochemical and Photobiological Sciences | - |
dc.citation.volume | 15 | - |
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