Nanoscale
·
2016
·Vol. 8
·期 45
·19161-19173
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IF 7.76
Qingchi Xu,Jiaxin Zeng,Haiqing Wang,Xingyun Li,Jun Xu,Jianyang Wu,Guangcan Xiao,Fang-Xing Xiao,Xiangyang Liu
A facile and efficient ligand-triggered electrostatic self-assembly strategy has been developed to fabricate a series of Au/CdS nanosheet (Ns) (Au–CdS Ns) nanocomposites with varied weight addition ratios of Au nanoparticles (NPs) by judiciously utilizing the intrinsic surface charge properties of assembly units, through which uniform dispersion and controllable deposition of Au NPs on the CdS Ns were achieved. Versatile probe reactions including photocatalytic oxidation of an organic dye pollutant, selective photocatalytic reduction of aromatic nitro compounds and photocatalytic hydrogen production reactions under visible light irradiation and ambient conditions were used to systematically evaluate the photoredox performances of the as-assembled well-defined Au–CdS Ns nanocomposites. It was unveiled that the photoactivities of Au–CdS Ns nanocomposites strongly depend on the weight addition ratio of Au NPs and the addition of an excess amount of Au NPs is detrimental to the separation of photogenerated charge carriers from CdS Ns. With the optimum addition amount of Au NPs (1 wt%), it was found that spontaneous assembly of Au NPs on the CdS Ns remarkably prolonged the lifetime of the photogenerated charge carriers from CdS Ns under visible light irradiation, thus resulting in significantly enhanced photocatalytic redox activities of Au–CdS Ns nanocomposites compared with those of CdS Ns. The crucial role of Au NPs in the photoredox reactions as efficient electron traps rather than plasmonic sensitizers was determined. Moreover, predominant active species responsible for the photocatalytic process were unambiguously determined and a possible photocatalytic mechanism was elucidated. It is anticipated that our work could open up a new avenue to rationally prepare various 2D semiconductors–metal nanocomposites by utilizing such a simple and efficient self-assembly strategy for extensive photocatalytic applications in a myriad of fields.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11619-11626
·
IF 2.195
Zeng Bin,Xia Qiuying,Zeng Wujun
A photocatalyst consisting of graphene/iodine doped CdS nanoplates (G/I-CdS NP) was fabricated using a microwave method. The phase structure, surface morphology, and optical bandgap were analyzed using X-ray diffractometry, photoluminescence spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, emission scanning electron microscopy, and transmission electron microscopy. Excellent photocatalytic performance was demonstrated based on the degradation of methylene orange (MO) under visible light irradiation. Therefore, doping of iodine in CdS nanoplates resulted in a bandgap reduction. The coupling of CdS with graphene could effectively suppress the recombination of light-induced electron–hole pairs. As a result, an excellent synergetic effect could be achieved for improved photocatalytic performance. These findings will have a positive impact on the use of metal sulfides for future environment-related applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 10
·14985-14994
·
IF 5.164
Siqi Qiu,Renbo Guo,Qingyu Wang,Feng Yang,Yibo Han,Xiaoniu Peng,Hui Yuan,Xina Wang
Summary P-type Ni(OH) 2 has been combined with n-type CdS nanorods and nanocrystals for enhanced photocatalytic property due to the p-n junction. Though CdS nanosheets exhibit fast charge transfer and large superficial area, the decoration of Ni(OH) 2 was rarely reported up to now. In this work, the photo-deposition of Ni(OH) 2 nanoparticles on CdS ultrathin nanoflakes was established for efficient photocatalytic H 2 generation. By changing the irradiation time of CdS, the reaction between Ni 2+ and OH − can be controlled for different loading density of Ni(OH) 2 . As the loading density-dependent morphology, light absorption, carrier separation and transfer were systematically studied for the composites, an obvious band gap narrowing from 2.28 to 2.08 eV was revealed, and the carrier separation and transfer between the CdS nanoflakes and Ni(OH) 2 nanoparticles have been enhanced for the composites with deposition time of 3 minutes. These together with the alignment of type “II” bands and the high specific surface area of the flakes and nanoparticles, lead to an optimum H 2 generation of 20.14 mmol/g/h, nearly three times of pure CdS (7.97 mmol/g/h). Such a study not only provides a deposition method of Ni(OH) 2 , but also sheds light on the enhancement strategy for photocatalytic property by controlling the microstructure and aligning the hetero-structured bands.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Shujun Qiu,Yongli Shen,Guijuan Wei,Shuang Yao,Wei Xi,Miao Shu,Rui Si,Min Zhang,Junfa Zhu,Changhua An
Maximizing the usage of cocatalyst to provide fruitful proton reduction sites and suppress charge carrier recombination is an effective stratagy to dramatically improve the photocatalytic performance. Herein, anchoring single atoms (SAs) of Pt onto the ultrathin porous CdS@carbon dots (CDs) nanosheets has been achieved through in-situ reduction of Pt precursor. X-ray absorption fine structure spectra identify that the single Pt atoms are bonded as Pt-S with a coordination number 4, due to the scattering between platinum center and the sulfur atoms. The Pt single atoms exhibit strong capacity to trap photo-generated electrons, rendering CdS@CDs/Pt-SAs as a class of efficient solar-driven photocatalyst. It shows an outstanding activity towards H 2 generation at rate of 45.5 mmol h −1 g −1 , which is 133 times of that for bare CdS@CDs. The novel method can be extended to the preparation of various functional nanocatalysts owing to its versatility and facileness.
研究领域:
材料科学
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纳米技术
·
催化
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 47
·21667-21679
·
IF 4.682
Jiang Jingjing,Ye Kun,Zhang Wenya,Ren Huajuan,Chen Haoyu,Hu Yuting,Wang Feiyu,Hou Jianhua,Diao Guowang,Chen Ming
Semiconductor photolysis of aquatic hydrogen has become a research hotspot in recent years. Cadmium sulfide (CdS) photocatalyst has been drawn widespread interest due to good visible light absorption, proper energy band potential, and excellent electron-hole pair production rate and mobility. In this work, three morphologies of CdS were synthesized successfully using different cadmium salts and sulfur sources by solvothermal methods. Compared with CdS nanospheres and nanorods, CdS nanosheets photocatalyst could suppressed the photoogenic electron holes better, resulting its high photocatalytic hydrogen generation activity. CdS nanosheets with good photostability showed the fastest photocatalytic hydrogen production rate (12.37 mmol h −1 g −1 ) with the support of simulated solar-light irradiation. These results indicated that the excellent photocatalytic performance of CdS nanosheets may be related to its exposed high index (002) lattice plane, which was main photocatalytic active lattice plane. This work optimized the catalytic properties of materials by regulating the morphology and the exposure of different lattice planes, which were of great significance for solar energy capture and conversion. Graphical Abstract
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 10
·6397-6405
·
IF 1.676
Yang Mengru,Shi Yonghong,Li Yuangang,Li Huajing,Luo Ningdan,Li Jin,Fan Jing,Zhou Anning
Abstract 2D Bi 2 S 3 /CdS nanosheet arrays have been constructed by a simple three-step method. Firstly, BiOI nanosheet arrays have been electrochemically grown on the surface of conductive FTO substrate and then converted into Bi 2 S 3 nanosheet arrays by ion exchange. Finally, CdS was hydrothermally deposited onto the surface of Bi 2 S 3 nanosheet arrays to form hybrid Bi 2 S 3 /CdS nanosheet arrays. The obtained hybrid heterojunction arrays have been used as photoanodes for photoelectrochemical hydrogen evolution and showed enhanced performance and prolonged stability. The photocurrent density of the elegant Bi 2 S 3 /CdS nanosheet arrays reaches 9.48 mA/cm 2 at 1.23 V RHE under an illumination of 100 mW/cm 2 from AM 1.5G sun simulator, which is more than ten times higher than that of the pure Bi 2 S 3 nanosheet arrays and the photocurrent density does not decline obviously after 4 h of continuous operation. Ultimately, a rational mechanism is proposed to elucidate the high performance and excellent stability of Bi 2 S 3 /CdS nanosheet arrays for photoelectrochemical cells. Graphic Abstract To obtain nanosheet arrays : Arrays of Bi 2 S 3 /CdS nanosheets on a FTO substrate are synthesized by electrodeposition, ion exchange and hydrothermal process. The Bi 2 S 3 /CdS nanosheet photoanodes show better photoactive and photostability compared to bare Bi 2 S 3 (CdS) nanosheets for photoelectrochemical splitting of water.
研究领域:
材料科学
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纳米技术
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
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