0D (MoS₂)/2D (g-C₃N₄) heterojunctions in Z-scheme for enhancedphotocatalytic and electrochemical hydrogen evolution

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dc.contributor.authorLiu, Y.
dc.contributor.authorZhang, H.
dc.contributor.authorKe, J.
dc.contributor.authorZhang, J.
dc.contributor.authorTian, W.
dc.contributor.authorXu, X.
dc.contributor.authorDuan, X.
dc.contributor.authorSun, H.
dc.contributor.authorO Tade, M.
dc.contributor.authorWang, S.
dc.date.issued2018
dc.description.abstractMoS2 quantum dots (MSQDs) with high and stable dispersion in water were prepared via a facile one-pot hydrothermal process. The MSQDs were then applied to decorate graphitic carbon nitride (g-C3N4, CN) nanosheets to obtain modified g-C3N4 photocatalysts (MSQD-CN). Compared to pristine g-C3N4, the hybrid photocatalysts showed a slight red shift and stronger light absorption with remarkably improved photocatalytic activity in water splitting to generate hydrogen. The hydrogen-evolution rate over 0.2 wt% MSQD-CN increased by 1.3 and 8.1 times as high as that of 0.2 wt% Pt-CN and g-C3N4, respectively. With deposition of 2 wt% Pt as a cocatalyst, 5 wt% MSQD-CN exhibited the highest photocatalytic efficiency with an average hydrogen evolution reaction (HER) rate of 577 μmol h−1 g−1. Photoluminescence spectra (PL) and photoelectrochemical measurements inferred that MSQDs introduction drastically promoted the electron transfer for more efficient separation of charge carriers, which could lower HER overpotential barriers and enhance the electrical conductivity. In addition, the well-matched band potentials of the MSQD-CN hybrid with an intimate contact interface of p-n heterojunction also inhibited the recombination of photo-generated carriers, leading to enhanced photocatalytic HER performance. A direct Z-scheme charge transfer mechanism of the MSQD-CN hybrid was proposed to further elaborate the synergistic effect between MSQDs, Pt and g-C3N4. This work underlines the importance of heterojunction interface and presents a feasible protocol for rational construction of g-C3N4 based photocatalysts for various photocatalytic applications.
dc.description.statementofresponsibilityYazi Liua, Huayang Zhang, Jun Ke, Jinqiang Zhang, Wenji Tian, Xinyuan Xu, Xiaoguang Duan, Hongqi Sun, Moses O Tadea, Shaobin Wang
dc.identifier.citationApplied Catalysis B: Environmental, 2018; 228:64-74
dc.identifier.doi10.1016/j.apcatb.2018.01.067
dc.identifier.issn0926-3373
dc.identifier.issn1873-3883
dc.identifier.orcidTian, W. [0000-0002-7503-5481] [0000-0002-9896-1154]
dc.identifier.orcidDuan, X. [0000-0001-9635-5807]
dc.identifier.orcidWang, S. [0000-0002-1751-9162]
dc.identifier.urihttp://hdl.handle.net/2440/113685
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/DP150103026
dc.relation.granthttp://purl.org/au-research/grants/arc/LE120100026
dc.rights© 2018 Elsevier B.V. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.apcatb.2018.01.067
dc.subjectMoS₂ QDs; Z-scheme; photocatalysis; hydrogen evolution reaction (HER); g-C₃N₄
dc.title0D (MoS₂)/2D (g-C₃N₄) heterojunctions in Z-scheme for enhancedphotocatalytic and electrochemical hydrogen evolution
dc.title.alternative0D (MoS(2))/2D (g-C(3)N(4)) heterojunctions in Z-scheme for enhancedphotocatalytic and electrochemical hydrogen evolution
dc.typeJournal article
pubs.publication-statusPublished

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