Photoelectrolchemical performance of PbS/CdS quantum dots co-sensitized TiO2 nanosheets array film photoelectrodes

Yao, Huizhen; Li, Xue; Liu, Li; Niu, Jiasheng; Ding, Dong; Mu, Yannan; Su, Pei-Fang; Wang, Guangxia; Yang, Haibin

doi:10.1016/j.jallcom.2015.06.132

Cited by 13 publications

(11 citation statements)

References 40 publications

(29 reference statements)

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“…By further loading CdS as a sensitizer, the photocatalytic activity can be significantly improved, which is attributed to the enhanced light absorption and efficient electron transport through the 3D hierarchical structure. Moreover, PbS/CdS QDs cosensitized TiO 2 nanosheet arrays with exposed {001} facets showed an impressive photocurrent density of 6.12 mA cm –2 under AM 1.5 G illumination (Figure A) . Likewise, CdS/CdSe cosensitized [110]-oriented ZnO nanosheet array films with exposed {0001} facets also show significantly enhanced photocurrent densities …”

Section: Modification Of Faceted Photoelectrodes With Enhanced Pec Pe...mentioning

confidence: 93%

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Crystal Facet Engineering of Photoelectrodes for Photoelectrochemical Water Splitting

2019

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Photoelectrochemical (PEC) water splitting is a promising approach for solar-driven hydrogen production with zero emissions, and it has been intensively studied over the past decades. However, the solar-to-hydrogen (STH) efficiencies of the current PEC systems are still far from the 10% target needed for practical application. The development of efficient photoelectrodes in PEC systems holds the key to achieving high STH efficiencies. In recent years, crystal facet engineering has emerged as an important strategy in designing efficient photoelectrodes for PEC water splitting, which has yet to be comprehensively reviewed and is the main focus of this article. After the Introduction, the second section of this review concisely introduces the mechanisms of crystal facet engineering. The subsequent section provides a snapshot of the unique facet-dependent properties of some semiconductor crystals including surface electronic structures, redox reaction sites, surface built-in electric fields, molecular adsorption, photoreaction activity, photocorrosion resistance, and electrical conductivity. Then, the methods for fabricating photoelectrodes with faceted semiconductor crystals are reviewed, with a focus on the preparation processes. In addition, the notable advantages of the crystal facet engineering of photoelectrodes in terms of light harvesting, charge separation and transfer, and surface reactions are critically discussed. This is followed by a systematic overview of the modification strategies of faceted photoelectrodes to further enhance the PEC performance. The last section summarizes the major challenges and some invigorating perspectives for future research on crystal facet engineered photoelectrodes, which are believed to play a vital role in promoting the development of this important research field.

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Section: Modification Of Faceted Photoelectrodes With Enhanced Pec Pe...mentioning

confidence: 93%

Section: Modification Of Faceted Photoelectrodes With Enhanced Pec Pe...mentioning

confidence: 99%

Crystal Facet Engineering of Photoelectrodes for Photoelectrochemical Water Splitting

2019

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“…Moreover, the narrow bandgap of PbS can give rise to a wider light absorption range than TiO 2 . Thus, TiO 2 nanoparticles combined with PbS QDs are equipped with an enhanced light harvesting ability . In addition, compared with pure TiO 2 nanoparticles, TiO 2 sensitized with PbS exhibits lower electron–hole recombination, which is beneficial for electron and hole transport …”

Section: Introductionmentioning

confidence: 99%

“…[5] Thus, TiO 2 nanoparticles combinedw ith PbS QDs are equipped with an enhanced light harvesting ability. [6] In addition, compared with pure TiO 2 nanoparticles, TiO 2 sensitized with PbS exhibits lower electron-hole recombination,which is beneficial for electron and hole transport. [7] To date, severala pproaches have been developed to obtain TiO 2 -supported semiconductor QDs.…”

Section: Introductionmentioning

confidence: 99%

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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“…Similarly, Ke et al reported (002)‐faceted 2D WO 3 nanoplates coupling with 2D ultrathin graphene nanosheets (Figure 3b). [ 74 ] Apart from (002) facet exposed WO 3 , many other semiconductors with high‐energy facets exposed have been applied in PEC water splitting, such as a {001} facet exposed TiO 2 photoanode, [ 75 ] {0001} facet exposed ZnO photoanode, [ 76 ] and {001} facet exposed Bi 2 MoO 6 photoanode. [ 77 ]…”

Section: Strategies For Improving Pec Performance Of 2d Photoanodesmentioning

confidence: 99%

Two‐Dimentional Nanostructured Metal Oxide/Sulfide–Based Photoanode for Photoelectrochemical Water Splitting

Tian

2020

Solar RRL

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The utilization of solar energy plays a vital role in relieving energy crisis and associated environmental problems. Photoelectrochemical (PEC) water splitting, which can directly transform solar energy into clean hydrogen energy, is one of the most promising strategies to utilize solar energy. 2D nanostructured metal oxides/sulfides have been widely applied as photoanodes in PEC cells due to their unique configuration and features, which can efficiently improve light absorption, enlarge electrode/electrolyte contacting interfaces, and promote carrier transfer and injection. This article begins with the introduction of performance parameters, carrier dynamics measurement, and mechanism exploration techniques for photoanodes, which is followed by an overview of research progress in using 2D nanostructure metal oxides/sulfides to fabricate efficient photoanodes for PEC water splitting. Subsequently, the recent representative strategies to optimize the PEC performance of 2D metal oxides/sulfides photoanodes, including structure engineering, defect engineering, element doping, heterojunction construction, and surface modification, are summarized. Finally, the exciting advances and future research directions for designing highly efficient 2D photoanodes are provided.

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Photoelectrolchemical performance of PbS/CdS quantum dots co-sensitized TiO2 nanosheets array film photoelectrodes

Cited by 13 publications

References 40 publications

Crystal Facet Engineering of Photoelectrodes for Photoelectrochemical Water Splitting

Crystal Facet Engineering of Photoelectrodes for Photoelectrochemical Water Splitting

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

Two‐Dimentional Nanostructured Metal Oxide/Sulfide–Based Photoanode for Photoelectrochemical Water Splitting

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Photoelectrolchemical performance of PbS/CdS quantum dots co-sensitized TiO2 nanosheets array film photoelectrodes

Cited by 13 publications

References 40 publications

Crystal Facet Engineering of Photoelectrodes for Photoelectrochemical Water Splitting

Crystal Facet Engineering of Photoelectrodes for Photoelectrochemical Water Splitting

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

Two‐Dimentional Nanostructured Metal Oxide/Sulfide–Based Photoanode for Photoelectrochemical Water Splitting

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