RSC Advances
·
2018
·Vol. 8
·期 21
·11489-11497
·
IF 2.936
Hui Li,Lihua Liu,Ziqun Wang,Xiuzhen Zheng,Sugang Meng,Shifu Chen,Xianliang Fu
Although the CdS photocatalyst has been extensively investigated, a rational hydrothermal synthesis route is still required to prepare highly active CdS for H2 evolution reaction (HER). To optimize the precursor of the sulfur source, three prevalent organic sulfur sources of thiourea (TA), thioacetamide (TAA) and L-cysteine (L-Cys) were used for hydrothermal synthesis of CdS. Their effects on the crystallographic structure, morphology, optical property, band structure, and photocatalytic HER performance of the products were then investigated systematically. The results indicated that hexagonal branched dendritic structure CdS (S-TA) could be produced in TA solution and showed the highest HER activity due to the branched 1D structure, the smallest interfacial electron transfer resistance and the most negative conduction band bottom (Ecb). Whereas in TAA, spherical CdS (S-TAA) with a mixed phase of hexagonal and cubic was obtained. The mixed phase structure and the more positive Ecb of S-TAA lead to a considerably lower HER activity than that of S-TA. Poorly crystallized hexagonal CdS nanoparticles (S-Cys) were prepared in L-Cys and showed the lowest HER performance as its Ecb is very near to H+ reduction potential. Thus, compared to T-AA and L-Cys, TA is a more suitable sulfur source for hydrothermal preparation of highly active CdS for HER.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Ting Yang,Mengmeng Lu,Xiaoli Mao,Wenhong Liu,Lei Wan,Shiding Miao,Jinzhang Xu
More than 5.0 g luminescent CdS quantum dots (QDs) were synthesized via a hot-bubbling route. The synthetic parameters including temperature, growth time, feeding ratio Cd/S and capping ligands were studied to show great influence on the optical properties . Two types of CdS “magic-sized” clusters (MSCs) emitting at 313 nm and 323 nm were obtained at temperature lower than 80 °C. The PL quantum yields of the CdS QDs reaches 11.6% when trioctyphosphine oxide was used as ligand. The prepared CdS QDs have been transferred into aqueous solution via ligand exchange (LE). To expand the spectral response in photovoltaic devices, two different sizes of CdS QDs were deposited on mesoporous TiO 2 /SiO 2 electrode, and the co-sensitized solar cells (SCs) were prepared. It was found that the co-sensitized SCs show a higher conversion efficiency ( η = 1.55%) than the single sized QDs sensitized SCs ( η = 0.53%). The incident photon-to-current conversion efficiency (IPCE) of co-sensitized SCs showed two peaks at 370 nm and 460 nm which resembles the absorption peaks of the two different sized QDs.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nano Research
·
2022
·
IF 1.78
Shui Tuan Lin,Lian Wei Shan,Cheng Guo Ma,Ming Qi Yuan,Zi Lan Fang,Yan Wei Xiao,Li Min Dong,Dan Li,Ying Kui Guo
Heterojunction semiconductor photocatalysis is an auspicious technique for clear up organic pollutants from water, and have been of valuable strategy in the area of photocatalysis. Herein, electrophoretic deposition procedure was used to prepare α-Bi2O3/CdS type-Ⅱ heterojunction photocatalysts. The results of PL, Raman, and EIS show that there is a heterojunction effect in α-Bi2O3/CdS, which is propitious to improve the separation efficiency of photogenerated electron-hole pairs. The DFT calculation reveals that the work function of CdS (4.57 eV) is higher than that of α-Bi2O3 (3.37 eV), which facilitates the migrating of e- from the CB of α-Bi2O3 to the CB of CdS, and the migrating of h+ from the VB of CdS to the VB of α-Bi2O3, thus the e--h+ pairs with high redox ability are retained. The performances were assessed by degrading methyl orange (MO), acid magenta under simulated visible light irradiation. Under simulated visible light irradiation, BC45 composite exhibited the highest degradation efficiency of 87% (MO) and 81% (acid fuchsin) for 4 h, which was about 2 times higher than that of CdS (MO) and (acid fuchsin). It is believed that the dual characteristics of H2O wettability and dye adsorption performance in α-Bi2O3/CdS composites promote photocatalytic process compared with single CdS and α-Bi2O3. The study could provide new insights to develop efficiently capable photocatalysts of the α-Bi2O3/CdS composites.
研究领域:
材料科学
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环境科学
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理论化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changyan Guo,Cheng Guo,Shuai Yang,Naeem Akram,Yonghong Zhang,Jide Wang
Controlling the excessive oxidation of 1,4-Benzenedimethanol (1,4-BDM) to selectively produce high-value-added 4-hydroxybenzaldehyde (4-HB) under mild conditions while simultaneously generating H 2 is a challenging problem. In this study, it was found that incorporating Ni into cadmium sulfide (CdS) significantly reduces the bandgap of CdS and adjusts its conduction band position, yet still leads to over-oxidation of 1,4-BDM. To enhance selectivity, we designed and synthesized a bifunctional photocatalyst, CdS-Ti/Ni, with a petal-like structure by integrating both Ni and Ti with CdS. This composite exhibits a bandgap of 2.3 eV, and the synergistic effects of Ti and Ni result in more favorable valence and conduction band positions, thereby demonstrating superior photocatalytic efficiency and selectivity. Within the first 30 minutes, the bifunctional CdS-Ti/Ni achieved a 73 % selectivity for 4-HB. The H 2 evolution rate reached 20.2 mmol·g −1 ·h −1 , which is 13 times higher than that of pure CdS. This study demonstrates that bimetal doping can adjust the energy band structure, photocatalytic H 2 production efficiency and oxidation selectivity of semiconductor materials, offering valuable insights for the design of efficient bifunctional photocatalysts.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Huilei Wang,Yilin Le,Jianzhong Sun
Bioconversion of biomass to bioenergy and recycle of cadmium wastewater are widespread and of significant economic importance. The development of an efficient and cost effective bioconversion process remains challenging. Here, recycling cadmium and un-pretreated biomass conversion were combined into a single operation. A modified consolidated bioprocessing (CBP) strategy of biomass and synthetic cadmium wastewater as mixed substrates for hydrogen generation through a couple of whole-cell catalysis with photocatalysis was established by Clostridium thermocellum . The process was accomplished by biotransformation of cadmium ions to cadmium sulfide (CdS) by C. thermocellum . The formed hybrid C. thermocellum -CdS complex converted biomass into hydrogen production through the integration of two reactions together, biocatalysis and photocatalysis. After optimization, the hydrogen production produced by C. thermocellum- CdS was remarkably increased by 36.1% if compared with that by C. thermocellum only . This exploration is expected to provide a novel strategy of collaborative disposal of cadmium wastewater and waste biomass, which would not only bring a great potential in the recycling and reusing of cadmium wastewater and waste biomass, but also provide new approach both for bioenergy recovery and environmental improvement.
研究领域:
生物能
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环境科学
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微生物学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 15
·10703-10713
·
IF 3.9
Jiayu Chen,Chun Ji,Xiao Wang,Yunxia Tian,Han Tao
Chlorpyrifos (CPF) is the most common pesticide entering the food chain and posing a threat to human health. This study presents a new electrochemical biosensor based on molybdenum disulfide nanosheets and nitrogen-doped carbon dot nanocomposite (MoS2@N-CDs) and kidney bean esterase (KdBE), and it is shown to achieve accurate detection of CPF. MoS2@N-CDs were prepared by a facile solvothermal method and characterized by electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical characterization confirmed that MoS2@N-CDs facilitated electron transfer and increased the electroactive surface area of the electrode, thereby improved the sensing performance of the electrode. The oxidation peak current of 1-naphthol, which was produced by the hydrolysis of 1-naphthyl acetate catalyzed by KdBE, was adopted as the signal of the sensor. CPF can suppress KdBE activity and consequently cause a decrease in the sensing signal. The experimental results show that the variation of sensing signal is a reliable index to evaluate the CPF level. Under the optimized conditions, the developed enzyme sensor showed superior CPF assay performance with a linear detection range as wide as 0.01–500 μg L−1 and LOD as low as 3.5 × 10−3 μg L−1 (S/N = 3). The inter- and intra-batch RSDs for electrode testing were 4.02% and 2.69%, respectively. Moreover, the developed biosensor also showed good stability and anti-interference. The spiked recoveries of CPF in oilseed rape and cabbage ranged from 98.09% to 106.01% with low relative standard deviation (RSD) (<5.23%), suggesting that the sensor is a promising tool to enable simple, low-cost but highly sensitive large-scale screening of CPF residues in food.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 10
·7914-7920
·
IF 1.569
Lan Zhang,Liu Lu,Huang Miaoliang,Wu Jihuai,Lin Jianming
Two kinds of hierarchical SnO 2 particles as nano-flower-like SnO 2 particles (NF-SnO 2 ) and mesoporous-sphere-like SnO 2 particles (MS-SnO 2 ) have been synthesized and used in CdS quantum dots (QDs) sensitized solar cells (QDSSC). TEM images show that NF-SnO 2 particles compose well interconnected nanoplates and MS-SnO 2 spheres are consisted with large numbers of SnO 2 nanoparticles with size about 7 nm. Owing to the larger Brunauer–Emmett–Teller surface area of NF-SnO 2 particles, NF-SnO 2 photoelectrode can load higher amounts of CdS QDs and shows enhanced light absorbance, resulting in higher short-circuit current density compared with that of MS-SnO 2 photoelectrode. The electrochemical impedance spectroscopy analysis results show that the QDSSC with NF-SnO 2 photoelectrode has a higher charge recombination resistance and a longer electron lifetime, so its photovoltaic performance is better than that of the QDSSC with MS-SnO 2 photoelectrode. The QDSSC with NF-SnO 2 photoelectrode can attain 3 % power conversion efficiency, which is higher than that of the cell with MS-SnO 2 photoelectrode (1.97 %).
研究领域:
材料科学
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能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Hongquan Fu,Jinhua Wang,Juan Zhang,Dan Liu,Hejun Gao,Yunwen Liao,Hao Yu
Though the different exposed crystal facets of cadmium sulfide (CdS) catalysts have been demonstrated to enhance their photocatalytic activity , the mechanism behind H 2 evolution on these diverse facets remains elusive. Here, we synthesized CdS photocatalysts with co-exposed (101) and (002) crystal facets, incorporating S vacancies via a hydrothermal method within the temperature range from 80 to 240 °C. The resulting CdS nanorods exhibited exposed (002) and (101) crystal facets, demonstrating abundant S vacancies, and showcased a notable photocatalytic hydrogen (H 2 ) evolution activity of 467.67 μmol g −1 ·h −1 —approximately 144 times higher than that of CdS nanoparticles . Both experimental results and density functional theory (DFT) calculations showed the significance of co-exposed (101) and (002) crystal facets as self-constructed crystal homojunctions on CdS, facilitating efficient spatial separation of photogenerated charges. Additionally, co-exposed (101) and (002) crystal facets with S vacancies, stemming from the mismatched lattice, were observed to enhance the adsorption of water (H 2 O) molecules. This, in turn, reduced the energy required for H 2 dissociative adsorption , providing thermodynamic advantages. The understanding of the synergistic effect between self-constructed (101) and (002) facet junctions and S vacancies on CdS for boosting photocatalytic H 2 evolution holds promise for expanding the applications of CdS-based materials in various photocatalytic processes.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chong Chen,Qiuhao Li,Fengqing Wang,Changjiang Hu,Jun Ma
Precise defect engineering of photocatalysts is highly demanding but remains a challenge. Here, we developed a facile and controllable γ-ray radiation strategy to assemble dual-vacancies confined MoS 2 -CdS-γ nanocomposite photocatalyst. We showed the solvated electron induced homogeneous growth of defects-rich CdS nanoparticles, while the symbiotic • OH radicals etched flower-like 1T/2H MoS 2 substrate surfaces. The optimal MoS 2 -CdS-γ exhibited a H 2 evolution rate of up to 37.80 mmol/h/g under visible light irradiation, which was 36.7 times higher than that of bare CdS-γ, and far superior to those synthesized by hydrothermal method. The microscopic characterizations and theoretical calculations revealed the formation of such unprecedented dual-sulfur-vacancies ensured the tight interfacial contact for fast charge separation. Besides, the existence of 1T-MoS 2 phase further improved the conductivity and strengthened the adsorption interaction with H + intermediate. Therefore, the radiolytic radical chemistry offered a facile, ambient and effective synthetic strategy to improve the catalytic performances of photocatalytic materials.
研究领域:
材料科学
·
纳米技术
·
光催化
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 12
·3533-3541
·
IF 2.482
Peng Shengnan,Jiang Yunhong,Wang Zeming,Luo Xudong,Lu Jinlin,Han Lu,Ding Yanhuai
Abstract CdS nano-photocatalysts hold a great promise for the photocatalytic hydrogen evolution; however, their practical application is greatly hampered by poor activity and stability due to the recombination of the photogenerated charge carriers and photocorrosion phenomena. Herein, we report a novel 3-dimensional CdS@UiO-66 nanostructures obtained by a facile solvent-free approach; with a step-by-step procedure, the core/shell configuration provided a suitable unit in size to easily equip defect-rich MoS 2 nanosheets. The UiO-66 Zr-MOFs used as a porous container to promote the dispersion of CdS nanoparticles, resulting to the increasement of active sites for photocatalytic reaction. The further enhanced photocatalytic activity for MoS 2 hybrid CdS@UiO-66 originated from the manufactured defect on the exposed edges of MoS 2 nanosheets, which was produced by adjusting the S/Mo ratio. UiO-66 did not only provide extensive migration routes over photogenerated electrons, more importantly, it created ample time and sites for accelerating consumption of the isolated photogenerated holes with sacrificial agent, resulting in alleviating photocorrosion reaction. The photocatalytic efficiency and photostability were simultaneously promoted. This work highlights the potential application of core/shell configuration in photocatalytic hydrogen evolution. Graphic Abstract
CdS@UiO-66 type composite photocatalyst was obtained in the condition of
solvent-free assembling at room temperature. The defect-rich MoS 2 nanosheets were
felicitously equipped on the core/shell configuration. The obtained defect MoS 2 hybrid CdS@UiO-66 composite material exhibits a high and stable hydrogen production rate
due to their synergistic effect.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Shuang Liang,Guozhe Sui,Jinlong Li,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Chao Wang,Shijie Chen
This study presents a novel approach for synthesizing C–ZnO/CdS graded nanorods derived from metal–organic frameworks (MOFs) that can be applied as a catalyst for photocatalytic hydrogen evolution from pure water. Porous C-doped ZnO was prepared by a self-template method using imidazole-like metal–organic backbone (ZIF-L) as a precursor through a two-step calcination method. CdS nanoparticles were deposited on ZIF-L surface by chemical deposition . The two-step calcination method introduced elemental C, and the unique architecture of ZIF-L played an essential role in forming the hierarchical structure of the porous ZnO nanorods. Compared with other ZnO/CdS catalysts, the C-doped ZnO/CdS graded nanorods exhibited remarkable photocatalytic activity for hydrogen production . The highest hydrogen production rate of 20.25 mmol g −1 h −1 with an apparent quantum yield (AQY) of 24.7% at 365 nm obtained over C–ZnO/CdS with Pt as co-catalyst, which was 24.4 and 65.3 times higher than that over CdS (0.83 mmol g −1 h −1 ) and ZnO (0.31 mmol g −1 h −1 ), respectively. This outcome was attributed to (i) the formation of Z-scheme heterojunction that significantly promoted the separation and migration of photogenerated electron–hole pairs; (ii) C doping that reduced the bandgap of ZnO and broadened its spectral response range; and (iii) the ordered arrangement of porous nanorods that effectively reduced the recombination rate of the electron–hole pairs.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Zhe Yin,Ziwen Wang,Jun Wang,Binglin Tang,Guoping Yu,Qiuyu Wang,Huanyu Chen,Kangzheng Li,Zhichao Zhang,Qingcheng Luo,Fuqin Zhang,Bo Lv
The use of photoreforming to treat plastics and degrade plastics to small molecular organic matter is an emerging approach to solve white pollution in the ocean and produce new energy. Structurally defective g-C 3 N 4 (COCN) is compounded by adding ascorbic acid during the synthesis of graphitic carbon nitride (g-C 3 N 4 ). L-cysteine is added to compose L-CdS. By constructing a heterojunction, we synthesize the ternary composite COCN/L-CdS/Ni 2 P. The hydrogen production rate of COCN/L-CdS/Ni 2 P reaches 29.11 mmol/g/h at 5 h, which is 7.52 times and 727.7 times of L-CdS and COCN, respectively. During the production of hydrogen, polylactic acid (PLA) is degraded to pyruvate. This study demonstrates that COCN/L-CdS/Ni 2 P can not only photoreformate plastics in seawater into small molecular organics, but also efficiently produce H 2 using seawater as a hydrogen source. This has a significant role to treat plastic pollution in seawater and product clean energy.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）