Enhanced charge collection and photocatalysis performance of CdS and PbS nanoclusters co-sensitized TiO2 porous film

Zhang, Miao; Xu, Yanyan; Gong, Zezhou; Tao, Jiajia; Sun, Zhaoqi; Lv, Jianguo; Chen, Xiaoshuang; Jiang, Xishun; He, Gang; Wang, Peihong; Meng, Fanning

doi:10.1016/j.jallcom.2015.07.145

Cited by 32 publications

(12 citation statements)

References 32 publications

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“…The variation in the sensitized TiO 2 bandgap is caused by the combined effects of PbS and TiO 2 . In addition, the bandgaps of PbS‐TiO 2 (1 h) and PbS‐TiO 2 (2 h) were higher than that of bulk PbS (0.41 eV), which indicated that the size of PbS QDs on TiO 2 are within the scale of nanostructures, consistent with the HR‐TEM results. The catalytic performance of PbS‐TiO 2 (1 h) and PbS‐TiO 2 (2 h) hybrid particles were tested in the catalytic reduction of Cr 6+ .…”

Section: Resultssupporting

confidence: 80%

“…[21] The bandgapcan be calculated from the intersection point of the horizontal ordinate and the straight green line. As shown in Figure 6B, the energy bandgap of PbS-TiO 2 (1 h) changed from 3eVf or pure TiO 2 to 1.8 eV.F urthermore, the bandgapo fP bS-TiO 2 (2 h) decreased to 1.5 eV.T he variation in the sensitized TiO 2 bandgap is caused by the combined effects of PbS and TiO 2 .I na ddition, the bandgapso fP bS-TiO 2 (1 h) and PbS-TiO 2 (2 h) were highert han that of bulk PbS (0.41 eV), which indicated that the size of PbS QDs on TiO 2 are within the scale of nanostructures, [22] consistent with the HR-TEM results. The catalytic performanceo fP bS-TiO 2 (1 h) and PbS-TiO 2 (2 h) hybrid particles were tested in the catalytic reduction of Cr 6 + .P henol was added to reactions ystem as at rapping agent for holes (h + )d uring the photocatalytic process before light irradiation.…”

Section: Resultsmentioning

confidence: 88%

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Controlled Synthesis of Hollow PbS‐TiO₂ Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Xia

Zhang

2017

Chemistry An Asian Journal

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Hollow hybrid nanostructures have received significant attention because of their unique structural features. This study reports a facile ion adsorption-heating method to fabricate hollow PbS-TiO hybrid particles. In this method, the TiO spheres used as a substrate material to grow PbS are aggregates of many small amorphous TiO particles, and each small particle is covered with thioglycolic acid ligands through Ti -carboxyl coordination. When Pb ions are added to a colloidal solution of these TiO spheres, these ions are adsorbed by sulfhydryl (-SH) groups to form metal thiolates, and the C-S bond is dissociated by heating to release S . The S ions react with Pb ions to form PbS without additive sulfur sources. Additionally, the amorphous TiO spheres are transformed into the anatase phase during the heating process. As a result, the crystallization of TiO spheres along with the formation of PbS is simultaneously carried out by heating. During the heating process, owing to the Kirkendall effect of S diffusion and the Ostwald ripening effect of the crystallization of amorphous TiO spheres, PbS-TiO hollow hybrid structures can be obtained. The XRD and XPS characterizations proved the formation of anatase TiO and PbS. The TEM characterization confirmed the formation of hollow structures in the PbS-TiO hybrid sample. The photocatalytic activity of the hollow PbS-TiO hybrid spheres have been investigated for the degradation of Cr under visible light. The results show that hollow PbS-TiO hybrid spheres exhibited the highest photocatalytic activity, in which almost all the Cr was degraded after 140 min.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 88%

Controlled Synthesis of Hollow PbS‐TiO₂ Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Xia

Zhang

2017

Chemistry An Asian Journal

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“…With increasing BiOI concentration from 0.008 mol/L to 0.012 mol/L, the band gap of the BiOI/TiO 2 heterostructure decreases from 3.0 to 1.95 eV. However, the band gap of the TBA‐3 heterostructure (2.1 eV) is greater than that of the TNA‐2 sample (1.95 eV) . These results indicate that TBA‐2 has a minimum band gap of 1.95 eV.…”

Section: Resultsmentioning

confidence: 85%

“…Conduction band and valence band potentials were calculated by the empirical equation :

E_{CB} = E_{VB} - E_{normalg} and E_{normalg} = X - E^{e} + 0.5 E_{normalg} .

…”

Section: Resultsmentioning

confidence: 99%

“…However, the band gap of the TBA-3 heterostructure (2.1 eV) is greater than that of the TNA-2 sample (1.95 eV). 37 These results indicate that TBA-2 has a minimum band gap of 1.95 eV. Experiments have shown that heterostructures with smaller band gaps have higher valence bands and lower conduction bands (CBs), indicating that it is easier to generate more photoelectrons and holes.…”

Section: Uv-visible Spectramentioning

confidence: 89%

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Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

et al. 2019

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In this study, TiO2 nanorod arrays (TNR), Ag quantum dots (QDs) sensitized with TNR TiO2/Ag, bismuth oxyhalide (BiOI) nanosheets, and Ag QDs co‐modified with TNR and TiO2/BiOI/Ag (TBA) were prepared by a stepwise process. The morphological, structural, compositional, optical, photocatalytic (PC), and photoelectrochemical (PEC) properties of the samples were investigated. The TBA‐2 sample exhibited the highest photocurrent density (281.8 μA/cm2) and photodegradation efficiency (93.3%), with values 9.7 times and 2.25 times higher than those for TNR, respectively. The improvement in sample performance can be attributed to the formation of a heterojunction between BiOI and TiO2, thereby enhancing the absorption of visible light and improving the charge separation efficiency; Ag QDs limit interfacial electron‐hole pair recombination. The experimental results show that TBA can effectively promote light‐induced carrier transport and visible light absorption, while inhibiting the recombination rate of the electron‐hole pairs, PEC, and PC.

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Efficient Hydrogen Evolution under Visible Light by Bimetallic Phosphide NiCoP Combined with g‐C₃N₄/CdS S‐Scheme Heterojunction

Zheng

Xian

et al. 2021

ChemCatChem

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Photocatalytic hydrogen evolution is a promising method to convert solar energy. Here, the heterojunction structure of g-C 3 N 4 /CdS was modified by NiCoP prepared by one-step method for the first time, and the photocatalyst NiCoP-g-C 3 N 4 /CdS was successfully designed and prepared, which can effectively separate and transfer photogenerated electrons and efficient hydrogen evolution under visible light. Moreover, NiCoP-g-C 3 N 4 /CdS photocatalyst has abundant surface-active sites, and its photocatalytic hydrogen evolution performance has been greatly improved. When NiCoP content was 5 % in NiCoP-g-C 3 N 4 /CdS, the catalytic activity was the highest, and the hydrogen production rate reached an astonishing 55.63 mmol h À 1 g À 1 , which was 23.35 times that of CdS (2.38 mmol h À 1 g À 1 ) and 11.51 times that of g-C 3 N 4 /CdS (4.84 mmol h À 1 g À 1 ). In addition, NiCoP-g-C 3 N 4 /CdS photocatalyst has excellent stability for hydrogen production. The materials were characterized and analyzed by XRD, SEM, TEM, XPS, UV-Vis DRS, FTIR, UPS, N 2 adsorption-desorption process and electrochemical test etc. At the same time, the possible mechanism of NiCoP-g-C 3 N 4 /CdS photocatalytic hydrogen production reaction is proposed. This study provides a new idea for the rational design of heterojunction photocatalyst and transition metal phosphide cocatalyst.

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Enhanced charge collection and photocatalysis performance of CdS and PbS nanoclusters co-sensitized TiO2 porous film

Cited by 32 publications

References 32 publications

Controlled Synthesis of Hollow PbS‐TiO₂ Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Controlled Synthesis of Hollow PbS‐TiO₂ Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

Efficient Hydrogen Evolution under Visible Light by Bimetallic Phosphide NiCoP Combined with g‐C₃N₄/CdS S‐Scheme Heterojunction

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Enhanced charge collection and photocatalysis performance of CdS and PbS nanoclusters co-sensitized TiO2 porous film

Cited by 32 publications

References 32 publications

Controlled Synthesis of Hollow PbS‐TiO2 Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Controlled Synthesis of Hollow PbS‐TiO2 Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO2 nanorod arrays

Efficient Hydrogen Evolution under Visible Light by Bimetallic Phosphide NiCoP Combined with g‐C3N4/CdS S‐Scheme Heterojunction

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Controlled Synthesis of Hollow PbS‐TiO₂ Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Controlled Synthesis of Hollow PbS‐TiO₂ Hybrid Structures through an Ion Adsorption–Heating Process and their Photocatalytic Activity

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

Efficient Hydrogen Evolution under Visible Light by Bimetallic Phosphide NiCoP Combined with g‐C₃N₄/CdS S‐Scheme Heterojunction