JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2015
·Vol. 20
·期 1
·29-36
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IF 2.446
Meng Ling,Liu Yingru,Zhang Jingbo,Bai Shouli,Luo Ruixian,Chen Aifan,Lin Yuan
A novel two-phase method was employed to directly deposit PbS quantum dots (QDs) on nanocrystalline SnO 2 thin films. In the two-phase method, the nanocrystalline SnO 2 thin film with adsorption of Pb 2+ ions was placed in an aqueous solution, and S 2− ions were dissolved in an oil solution. As two solutions were contacted, S 2− ions prefer to transfer to the aqueous solution and diffuse to the thin film surface with the adsorbed Pb 2+ ions to homogeneously form monodispersed PbS QDs on the nanocrystalline thin film. The homogeneous monodispersed QDs-sensitized thin film was used as a photoelectrode to fabricate QDs-sensitized solar cell. The loaded amount of PbS QDs and the thickness of ZnS passivation layer were optimized to obtain the highest light-to-electric conversion efficiency of 1.01 % under the simulated AM 1.5 illumination, which is increased by 61 % compared with that of the PbS QDs-sensitized solar cell employing the successive ionic layer adsorption and reaction (SILAR). The solar cell with homogeneous sensitization of QDs generates a photocurrent density of 11.09 mA·cm −2 , which is 2.4 times higher than that of the unhomogeneous one prepared by SILAR. The conversion efficiency enhancement mechanism due to the two-phase method was discussed in detail through the measurements of intensity-modulated photovoltage spectrum and electrochemical impedance spectroscopy.
研究领域:
材料科学
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光电化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 34
·6598-6606
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IF 4.034
Miao Wang,Aiwei Tang,Dongxu Zhu,Chunhe Yang,Feng Teng
We present a two-phase approach for controllable synthesis of metal sulfide nanocrystals, such as Cu2−xS, Ag2S and Ni9S8, in which the reaction takes place at the water/oil interface. This method is environmental-friendly and economical due to the use of low-toxicity and low-cost reagents. The crystal phase and composition can be manipulated by varying the amount of n-dodecanethiol (DDT) in the organic phase and the type of metal salt in the aqueous phase. For example, CuO nanocrystals can be obtained in the presence of low DDT concentration and hydroxyl ions, and Cu2−xS nanocrystals are successfully synthesized in the presence of relatively high DDT concentration. The XPS spectra and near-infrared (NIR) absorption spectra have been collected to confirm the formation of CuO and Cu2−xS nanocrystals. Moreover, the Cu2−xS nanocrystals often exhibit an obvious localized surface plasmon resonance band due to their excess free holes in the valence band. A plausible formation mechanism has been proposed to study the synthesis of Cu2−xS and CuO nanocrystals. This two-phase approach has also been extended to prepare Ag2S and Ni9S8 nanocrystals, and the Ag and Ag2S nanocrystals often coexist in the products which are closely associated with cleavage of S–C bonds or the Ag–S bond, which relies on the DDT dosage and the reactivity of the metal sources. This two-phase approach may open up a simple and environmental-friendly strategy for synthesis of metal sulfide nanocrystals with controllable crystal phase and morphology.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 37
·19699-19709
·
IF 14.511
Min Lv,Fengxia Tong,Zeyan Wang,Yuanyuan Liu,Peng Wang,Hefeng Cheng,Ying Dai,Zhaoke Zheng,Baibiao Huang
Photocatalytic oxidation of amines to high value-added imines is crucial but challenging. The adsorption ability to reactant molecules and the charge separation ability are important factors affecting the reactivity. Different facets of monoclinic BiVO4 (m-BiVO4) have varied electronic structures, leading to differences in the adsorption ability and charge separation ability. Thus, tailoring the exposed facets is a promising strategy to optimize the reactivity. Herein, the density functional theory (DFT) calculations demonstrate that for m-BiVO4, both the benzylamine (BnNH2) adsorption ability and charge separation ability of {101} facets were stronger than those of {110} facets. These results motivate us to synthesize m-BiVO4 quadrangular nanoprisms (Q-BiVO4) with highly exposed {101} facets through a colloidal two-phase method. Q-BiVO4 exhibits highly enhanced charge separation efficiency and excellent photocatalytic performance for oxidizing BnNH2 to N-benzylidenebenzylamine (N-BB). More impressively, the efficient charge transfer between Q-BiVO4 and BnNH2 was directly confirmed via single-particle spectroscopy in situ. This work provides direct evidence to deeply understand the interaction between Q-BiVO4 and the reactant molecules and provides insights for rational design of photocatalysts with specific exposed facets for selective oxidation of amines.
研究领域:
材料科学
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化学
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催化
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纳米技术
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产品关联
DOI
高影响因子
Nature Protocols
·
2025
·
IF 16
Zhang Fenghua,Shi Wenxiong,Liu Qingda,Wang Xun
Atomic-level manufacturing enables the bottom-up fabrication of nanomaterials with tailored structures and properties. Clusters with atomic precise structures can be used as superatom building blocks to construct superstructures with exceptional properties beyond their individual properties. However, the programmable and large-scale synthesis of cluster assemblies remains challenging. This protocol describes the detailed experimental procedures for the modular assembly of polyoxometalate (POM) clusters into subnanomaterials by programmable interactions under simple and mild conditions. In this approach different types of POM clusters (0.7–1.8 nm in size) are coated with quaternary ammonium or oleylamine ligands using either two-phase or solvothermal methods. The assembly process depends on the interactions between atom clusters, ligands and the reaction matrix, all of which can be modified to generate a library of subnanometer superstructures. The four intercluster connection modes are metal cation-induced coordinative connection, anion bridged covalent connection, synergistic noncovalent interaction and cluster–nucleus co-assembly. A library that includes single-cluster nanowires, clusterphenes and nanosheets with single-cluster thicknesses, can be prepared within 3–12 h. Owing to their ultrahigh surface atom ratio and electron delocalization, the resulting subnanometer POM assemblies with rich structural and compositional diversity exhibit excellent properties and application potential in terms of mechanics, catalysis and chirality. This procedure is suitable for users with prior expertise in the synthesis of inorganic and cluster-based nanomaterials.
研究领域:
纳米科技
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无机化学
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团簇科学
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材料科学
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超分子化学
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合成化学
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物理化学
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表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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