JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 23
·19614-19619
·
IF 2.324
Hu Yiwei,Chen Xinhang,Ren Xiaohui,Huang Zongyu,Qi Xiang,Zhong Jianxin
Tin disulfide (SnS 2 ) has been attracted intensive attention in the field of photoelectric conversion due to its appropriate band gap and glorious electronic mobility. The hexagon SnS 2 nanosheets has been successfully integrated through a facile one-pot hydrothermal method. SEM images, Raman spectra, atomic force microscope and X-ray diffraction patterns are measured to carry out to investigate the morphologies and microstructures of SnS 2 nanosheetsm, confirming a good crystallized SnS 2 . Then, the photochemical activity of as-prepared SnS 2 nanosheets were tested in the electrolyte of Na 2 SO 4 . Photoelectrochemical tests demonstrate that the photocurrent density of as-prepared hexagon SnS 2 nanosheets (1.66 µA/cm 2 at a light intensity of 140 mW/cm 2 ) is hugely increased with increasing light intensity. Furthermore, after 50 cycles, the photocurrent density does not change significantly, indicating that the as-prepared SnS 2 nanosheets possesses superior stabilities. The outstanding photocatalytic performances of SnS 2 nanosheets are not only resulted from its huge specific surface area, which can harvest more light and provide more active sites, but also attributed to its superior charge mobility, which can facilitate the separation photogenerated electron–hole pairs and the charge transfer between SnS 2 nanosheets and the electrode. The most important is that our work reveals the hexagonal SnS 2 nanosheets not only possess superior photoelectrochemical properties, but also have great potential applications in energy conversion and photodetector fields.
研究领域:
材料科学
·
光催化
·
能源转换
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纳米材料
·
光电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 24
·11370-11376
·
IF 9.931
Qinglong Fu,Pan Yang,Jingchuan Wang,Hefang Wang,Lijun Yang,Xiaochong Zhao
Simple, safe and economic methods to prepare Ni nanofibers are required for their practical application. Herein, an in situ vacuum thermal reduction strategy is proposed to synthesize Ni nanofibers on a large scale, which involves electrospinning of a nickel acetate/polyvinylpolypyrrolidone/ethyl cellulose (NiAc/PVP/EC) precursor solution, followed by vacuum thermal treatment. Characterization of the morphology and microstructure reveals that the as-prepared Ni nanofibers are composed of nano-size Ni grains and possess a large surface area. Moreover, it has been demonstrated that the content of EC is closely related to the size of Ni grains and thus the surface area of Ni nanofibers. On account of their high specific surface area, the as-prepared Ni nanofibers exhibit efficient catalytic properties for H2 generation from hydrous hydrazine in an alkaline solution.
研究领域:
材料科学
·
纳米技术
·
催化化学
·
能源材料
·
物理化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jishu Han,Fangxu Dai,Ying Liu,Ruiyang Zhao,Lei Wang,Shouhua Feng
The photocatalytic hydrogen production has become one of the most promising strategies to solve the energy crisis and environmental pollution. Novel CdSe/SrTiO 3 nanocomposites (average diameter ≈ 114.6 nm) with high photocatalytic activity are synthesized and used for visible light photocatalytic water splitting for hydrogen production . Through optimizing the concentration of CdSe QDs, CdSe/SrTiO 3 nanocomposites exhibit increased visible light absorption and enhanced photocatalytic hydrogen evolution efficiency compared to SrTiO 3 nanoparticles. The maximum H 2 evolution amount reaches to 3350.53 μmol in 8 h by using CdSe/SrTiO 3 -3 as catalyst. Owing to the formation of heterojunction at the interface between CdSe and SrTiO 3 , the electrochemical impedance spectrum of CdSe/SrTiO 3 -3 exhibits the smallest arc radius and the photocurrent density of CdSe/SrTiO 3 -3 reaches to 0.26 μA cm −2 . The photogenerated electrons are effectively separated and transferred and the recombination of electron-hole pairs is avoided, thus significantly improving the photocatalytic hydrogen production performance of CdSe/SrTiO 3 nanocomposites.
研究领域:
材料科学
·
物理化学
·
纳米催化
·
能源材料
·
光催化
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Lingwei Lu,Meilin Lv,Gang Liu,Xiaoxiang Xu
Constituting solid solutions has been an appealing means to gain control over various physicochemical properties. In this work, we synthesized a series of SrTiO 3 -BiFeO 3 solid solutions and systematically explored their structural, optical and photocatalytic properties. Our results show that all solid solutions crystallize in a primitive cubic structure and their band gap values can be easily tuned by adjusting molar ratios between SrTiO 3 and BiFeO 3 . Photocatalytic hydrogen production under both full range and visible light irradiation is greatly improved after forming solid solutions. The highest hydrogen production rate obtained is ∼180 μmol/h under full range irradiation (λ ≥ 250 nm) and ∼4.2 μmol/h under visible light irradiation (λ ≥ 400 nm), corresponding to apparent quantum efficiency ∼2.28% and ∼0.10%, respectively. The activity is found to be strongly influenced by surface area and light absorption. Theoretical calculation suggests that Fe contributes to the formation of spin-polarized bands in the middle of original band gap and is responsible for the band gap reduction and visible light photocatalytic activity .
研究领域:
材料化学
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光催化
·
能源材料
·
无机固体化学
·
半导体物理
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太阳能转化
·
表面科学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xingyan Liu,Tianrong Xiong,Yonggang Xu,Kunhe Yang,Youzhou He,Haifeng Yang,Hong Wu,Jiajia Jing,Siqi Li,Siping Wei
Defect engineering for MOFs is a promising approach to accelerate the charge transfer to further enhance the photocatalytic performance. Up to now, the current defect engineering strategy for MOFs mainly focuses on a single adjustment mode with the apparent ceiling effect, whether the further break out of the ceiling effect could be achieved through the combination of two or more adjustment modes is still in its infancy. In this work, the original NH 2 -MIL-125 was firstly adjusted by a single adjustment mode in ethanol solvothermal method to obtain partially linker defective NM-125-X (where X signifies the distinct temperatures used in the solvothermal treatment, with optimal results observed at X = 120). Subsequently, the NM-125-120 was further re-regulated by adjusting the ligand defects through another adjustment mode in water heating agitation, resulting in the ultimate defective NM-125-120-65. The NM-125-120-65 obtained through double defect engineering avenue showed superior photocatalytic performance with the hydrogen production rate of 11585.23 μmol·g −1 , which was 1.23 and 14.05 times as those of partially defective NM-125-120 (9427.65 μmol·g −1 ) and original NH 2 -MIL-125 (824.85 μmol·g −1 ), respectively. In addition, the NO removal rate of NM-125-120-65 was 64.8 % also higher than that of NM-125-120 (37.8 %) and NH 2 -MIL-125 (23.6 %). Through a series of comparative experiments, especially TGA and XPS, it was noted that the ligand defective NH 2 -MIL-125 can be formed by ethanol solvothermal method, and it was also confirmed that through further re-regulating the ligand defects in water heating agitation, the linker defects could also be further expanded. The PL emission spectra, IT diagrams, and EIS measurements displayed that the NM-125-120-65 had outstanding conductivity and excellent electron mobility compared to NM-125-120 and NH 2 -MIL-125. This work provided a novel approach for the subsequent defect engineering by another adjustment mode based on the existing defective MOFs via double linker defect engineering adjustment modes, so as to further obtain better photocatalytic performance for solving the environmental and energy crisis.
研究领域:
材料科学
·
环境化学
·
能源化学
·
光催化
·
纳米材料
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jinxing Yu,Xiaoxiang Xu
Cr doped Ruddlesden-Popper compound Sr 2 TiO 4 has been successfully modified by fluorine to form a new compound Sr 2 Ti 0.95 Cr 0.05 O 3 F 2 . Structure analysis suggests two types of fluorine in the structure of this new compound, i.e. intralayer and interlayer F, which induce strong built-in electric field within this layered compound. The electric field stems from uneven distribution of F atoms on the two sides of perovskite layers therefore leads to charge disproportionation . DFT calculations suggest that this unique structural feature is highly beneficial for charge dissociations as it breaks the coplanar settlement of conduction band minimum and valence band maximum whilst maintains the 2D charge transportation properties. This is clearly demonstrated by the superior photocatalytic activities of Sr 2 Ti 0.95 Cr 0.05 O 3 F 2 for hydrogen production from water. Apparent quantum efficiency (AQE) as high as 1.16% at 420 ± 20 nm has been achieved which stands as the highest AQE reported on Sr 2 TiO 4 to date. Photoelectrochemical (PEC) analysis confirms improved charge separation conditions and prolonged charge lifetime.
研究领域:
材料化学
·
光催化
·
能源化学
·
物理化学
·
无机功能材料
·
太阳能转化
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）