File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1016/j.apcatb.2020.119151
- Scopus: eid_2-s2.0-85085284927
- WOS: WOS:000539373300021
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Interpreting the enhanced photoactivities of 0D/1D heterojunctions of CdS quantum dots /TiO2 nanotube arrays using femtosecond transient absorption spectroscopy
Title | Interpreting the enhanced photoactivities of 0D/1D heterojunctions of CdS quantum dots /TiO2 nanotube arrays using femtosecond transient absorption spectroscopy |
---|---|
Authors | |
Keywords | Photoelectrocatalytic hydrogen evolution Z-scheme heterojunction Transient absorption spectroscopy |
Issue Date | 2020 |
Publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apcatb |
Citation | Applied Catalysis B: Environmental, 2020, v. 275, p. article no. 119151 How to Cite? |
Abstract | Heterojunctions of CdS quantum dots (QDs)/TiO2 nanotube arrays (NTAs) were synthesized via a simple vapor transport approach. The 0D/1D QDs/NTAs electrodes exhibited 5-fold improvement efficiency for photocatalytic dye degradation and hydrogen evolution compared to pure TiO2 NTAs in a photoelectrochemistry cell, which was attributed to the faster transportation and retarded recombination of electron-hole pairs in the 0D/1D heterostructures. Femtosecond transient absorption offers deep insights into the dynamics of the charge carriers, showing that surface-trapped electrons were generated within 1.2 ps. The lifetimes for recombination of electrons at shallow trap sites with holes and deep trapped electrons with holes are prolonged to 73.2 ps and 622.6 ps, respectively. The reduced charge transfer resistance is verified by electrochemical impedance spectroscopy. Mott-Schottky plots indicated downward shifts for both the conduction band and valence band in the heterostructure. Finally, a Z-scheme photoreactive mechanism is proposed to explain the enhanced catalytic activities. |
Persistent Identifier | http://hdl.handle.net/10722/300774 |
ISSN | 2023 Impact Factor: 20.2 2023 SCImago Journal Rankings: 5.112 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | YAN, Z | - |
dc.contributor.author | Wang, W | - |
dc.contributor.author | Du, L | - |
dc.contributor.author | Zhu, J | - |
dc.contributor.author | Phillips, DL | - |
dc.contributor.author | Xu, J | - |
dc.date.accessioned | 2021-07-06T03:10:03Z | - |
dc.date.available | 2021-07-06T03:10:03Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Applied Catalysis B: Environmental, 2020, v. 275, p. article no. 119151 | - |
dc.identifier.issn | 0926-3373 | - |
dc.identifier.uri | http://hdl.handle.net/10722/300774 | - |
dc.description.abstract | Heterojunctions of CdS quantum dots (QDs)/TiO2 nanotube arrays (NTAs) were synthesized via a simple vapor transport approach. The 0D/1D QDs/NTAs electrodes exhibited 5-fold improvement efficiency for photocatalytic dye degradation and hydrogen evolution compared to pure TiO2 NTAs in a photoelectrochemistry cell, which was attributed to the faster transportation and retarded recombination of electron-hole pairs in the 0D/1D heterostructures. Femtosecond transient absorption offers deep insights into the dynamics of the charge carriers, showing that surface-trapped electrons were generated within 1.2 ps. The lifetimes for recombination of electrons at shallow trap sites with holes and deep trapped electrons with holes are prolonged to 73.2 ps and 622.6 ps, respectively. The reduced charge transfer resistance is verified by electrochemical impedance spectroscopy. Mott-Schottky plots indicated downward shifts for both the conduction band and valence band in the heterostructure. Finally, a Z-scheme photoreactive mechanism is proposed to explain the enhanced catalytic activities. | - |
dc.language | eng | - |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apcatb | - |
dc.relation.ispartof | Applied Catalysis B: Environmental | - |
dc.subject | Photoelectrocatalytic hydrogen evolution | - |
dc.subject | Z-scheme heterojunction | - |
dc.subject | Transient absorption spectroscopy | - |
dc.title | Interpreting the enhanced photoactivities of 0D/1D heterojunctions of CdS quantum dots /TiO2 nanotube arrays using femtosecond transient absorption spectroscopy | - |
dc.type | Article | - |
dc.identifier.email | Wang, W: wenchao9@hku.hk | - |
dc.identifier.email | Du, L: ailleen@hku.hk | - |
dc.identifier.email | Phillips, DL: phillips@hku.hk | - |
dc.identifier.authority | Phillips, DL=rp00770 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.apcatb.2020.119151 | - |
dc.identifier.scopus | eid_2-s2.0-85085284927 | - |
dc.identifier.hkuros | 323198 | - |
dc.identifier.volume | 275 | - |
dc.identifier.spage | article no. 119151 | - |
dc.identifier.epage | article no. 119151 | - |
dc.identifier.isi | WOS:000539373300021 | - |
dc.publisher.place | Netherlands | - |