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Article: Femtosecond time-resolved spectroscopic observation of long-lived charge separation in bimetallic sulfide/g-C3N4 for boosting photocatalytic H2 evolution

TitleFemtosecond time-resolved spectroscopic observation of long-lived charge separation in bimetallic sulfide/g-C3N4 for boosting photocatalytic H2 evolution
Authors
Keywordsg-C3N4 long-lived charge separation
Visible-NIR photocatalysis
Transient absorption spectroscopy
Issue Date2021
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apcatb
Citation
Applied Catalysis B: Environmental, 2021, v. 282, p. article no. 119568 How to Cite?
AbstractCopper-nickel sulfides could effectively suppress deep trapping states of active charge in carbon nitride. It also improves the efficiency of the shallow trapped electron transfer through Csingle bondS bond for enhancing visible-light-driven photocatalytic hydrogen production with rates up to 752.8 μmol h−1 g−1, that is 470 times higher than that of pristine g-C3N4 (1.6 μmol h−1 g−1) so far. The kinetic coupling of electron transfer and long-lived charge separation (∼ 4896 ps) are systematically investigated by femtosecond time-resolved absorption spectroscopy (fs-TA). The TA signal of the composite is quenched by hole sacrificial agent, assigning to the effective hole extraction for high photocatalytic activity. Furthermore, a remarkable near-infrared-driven photocatalytic H2 evolution (0.32 μmol h−1 g−1, λ > 800 nm) was achieved due to the hole transfer from copper-nickel sulfide to the trap state of g-C3N4, indicating that the strong interaction between copper-nickel sulfide and g-C3N4 is favorable to charge transfer and long-lived charge separation states.
Persistent Identifierhttp://hdl.handle.net/10722/300886
ISSN
2023 Impact Factor: 20.2
2023 SCImago Journal Rankings: 5.112
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, W-
dc.contributor.authorTao, Y-
dc.contributor.authorDu, L-
dc.contributor.authorWei, W-
dc.contributor.authorYAN, Z-
dc.contributor.authorChan, WK-
dc.contributor.authorLian, Z-
dc.contributor.authorZhu, R-
dc.contributor.authorPhillips, DL-
dc.contributor.authorLi, G-
dc.date.accessioned2021-07-06T03:11:34Z-
dc.date.available2021-07-06T03:11:34Z-
dc.date.issued2021-
dc.identifier.citationApplied Catalysis B: Environmental, 2021, v. 282, p. article no. 119568-
dc.identifier.issn0926-3373-
dc.identifier.urihttp://hdl.handle.net/10722/300886-
dc.description.abstractCopper-nickel sulfides could effectively suppress deep trapping states of active charge in carbon nitride. It also improves the efficiency of the shallow trapped electron transfer through Csingle bondS bond for enhancing visible-light-driven photocatalytic hydrogen production with rates up to 752.8 μmol h−1 g−1, that is 470 times higher than that of pristine g-C3N4 (1.6 μmol h−1 g−1) so far. The kinetic coupling of electron transfer and long-lived charge separation (∼ 4896 ps) are systematically investigated by femtosecond time-resolved absorption spectroscopy (fs-TA). The TA signal of the composite is quenched by hole sacrificial agent, assigning to the effective hole extraction for high photocatalytic activity. Furthermore, a remarkable near-infrared-driven photocatalytic H2 evolution (0.32 μmol h−1 g−1, λ > 800 nm) was achieved due to the hole transfer from copper-nickel sulfide to the trap state of g-C3N4, indicating that the strong interaction between copper-nickel sulfide and g-C3N4 is favorable to charge transfer and long-lived charge separation states.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apcatb-
dc.relation.ispartofApplied Catalysis B: Environmental-
dc.subjectg-C3N4 long-lived charge separation-
dc.subjectVisible-NIR photocatalysis-
dc.subjectTransient absorption spectroscopy-
dc.titleFemtosecond time-resolved spectroscopic observation of long-lived charge separation in bimetallic sulfide/g-C3N4 for boosting photocatalytic H2 evolution-
dc.typeArticle-
dc.identifier.emailWang, W: wenchao9@hku.hk-
dc.identifier.emailDu, L: ailleen@hku.hk-
dc.identifier.emailWei, W: weiz19@hku.hk-
dc.identifier.emailChan, WK: waichan@hku.hk-
dc.identifier.emailPhillips, DL: phillips@hku.hk-
dc.identifier.authorityChan, WK=rp00667-
dc.identifier.authorityPhillips, DL=rp00770-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.apcatb.2020.119568-
dc.identifier.scopuseid_2-s2.0-85091966152-
dc.identifier.hkuros323184-
dc.identifier.volume282-
dc.identifier.spagearticle no. 119568-
dc.identifier.epagearticle no. 119568-
dc.identifier.isiWOS:000591696100007-
dc.publisher.placeNetherlands-

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