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Article: Copper Phosphide-Enhanced Lower Charge Trapping Occurrence in Graphitic-C3 N4 for Efficient Noble-Metal-Free Photocatalytic H2 Evolution

TitleCopper Phosphide-Enhanced Lower Charge Trapping Occurrence in Graphitic-C3 N4 for Efficient Noble-Metal-Free Photocatalytic H2 Evolution
Authors
Keywordsg-C3N4
Cu3P
photocatalysis
H2 evolution
charge trapping
Issue Date2019
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/aamick
Citation
ACS Applied Materials & Interfaces, 2019, v. 11 n. 18, p. 16527-16537 How to Cite?
AbstractGraphitic carbon nitride (g-C3N4) fundamental photophysical processes exhibit a high frequency of charge trapping due to physicochemical defects. In this study, a copper phosphide (Cu3P) and g-C3N4 hybrid was synthesized via a facile phosphorization method. Cu3P, as an electron acceptor, efficiently captures the photogenerated electrons and drastically improved the charge separation rate to cause a significantly enhanced photocatalytic performance. Moreover, the robust and intimate chemical interactions between Cu3P and g-C3N4 offers a rectified charge-transfer channel that can lead to a higher H2 evolution rate (HRE, 277.2 μmol h–1 g–1) for this hybrid that is up to 370 times greater than that achieved from using bare g-C3N4 (HRE, 0.75 μmol h–1 g–1) with a quantum efficiency of 3.74% under visible light irradiation (λ = 420 nm). To better determine the photophysical characteristics of the Cu3P-induced charge antitrapping behavior, ultrafast time-resolved spectroscopy measurements were used to investigate the charge carriers’ dynamics from femtosecond to nanosecond time domains. The experimental results clearly revealed that Cu3P can effectively enhance charge transfer and suppress photoelectron–hole recombination.
Persistent Identifierhttp://hdl.handle.net/10722/279296
ISSN
2019 Impact Factor: 8.758
2015 SCImago Journal Rankings: 2.381

 

DC FieldValueLanguage
dc.contributor.authorWang, W-
dc.contributor.authorZhao, X-
dc.contributor.authorCao, Y-
dc.contributor.authorYan, Z-
dc.contributor.authorZhu, R-
dc.contributor.authorTao, Y-
dc.contributor.authorChen, X-
dc.contributor.authorZhang, D-
dc.contributor.authorLi, G-
dc.contributor.authorPhillips, DL-
dc.date.accessioned2019-10-25T13:52:58Z-
dc.date.available2019-10-25T13:52:58Z-
dc.date.issued2019-
dc.identifier.citationACS Applied Materials & Interfaces, 2019, v. 11 n. 18, p. 16527-16537-
dc.identifier.issn1944-8244-
dc.identifier.urihttp://hdl.handle.net/10722/279296-
dc.description.abstractGraphitic carbon nitride (g-C3N4) fundamental photophysical processes exhibit a high frequency of charge trapping due to physicochemical defects. In this study, a copper phosphide (Cu3P) and g-C3N4 hybrid was synthesized via a facile phosphorization method. Cu3P, as an electron acceptor, efficiently captures the photogenerated electrons and drastically improved the charge separation rate to cause a significantly enhanced photocatalytic performance. Moreover, the robust and intimate chemical interactions between Cu3P and g-C3N4 offers a rectified charge-transfer channel that can lead to a higher H2 evolution rate (HRE, 277.2 μmol h–1 g–1) for this hybrid that is up to 370 times greater than that achieved from using bare g-C3N4 (HRE, 0.75 μmol h–1 g–1) with a quantum efficiency of 3.74% under visible light irradiation (λ = 420 nm). To better determine the photophysical characteristics of the Cu3P-induced charge antitrapping behavior, ultrafast time-resolved spectroscopy measurements were used to investigate the charge carriers’ dynamics from femtosecond to nanosecond time domains. The experimental results clearly revealed that Cu3P can effectively enhance charge transfer and suppress photoelectron–hole recombination.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/aamick-
dc.relation.ispartofACS Applied Materials & Interfaces-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].-
dc.subjectg-C3N4-
dc.subjectCu3P-
dc.subjectphotocatalysis-
dc.subjectH2 evolution-
dc.subjectcharge trapping-
dc.titleCopper Phosphide-Enhanced Lower Charge Trapping Occurrence in Graphitic-C3 N4 for Efficient Noble-Metal-Free Photocatalytic H2 Evolution-
dc.typeArticle-
dc.identifier.emailPhillips, DL: phillips@hku.hk-
dc.identifier.authorityPhillips, DL=rp00770-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acsami.9b01421-
dc.identifier.hkuros308139-
dc.identifier.volume11-
dc.identifier.issue18-
dc.identifier.spage16527-
dc.identifier.epage16537-
dc.publisher.placeUnited States-

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