RSC Advances
·
2018
·Vol. 8
·期 61
·35306-35313
·
IF 2.936
Pengpeng Feng,Yusong Pan,Hui Ye
NaYF4:Yb,Tm upconversion nanocrystals with hexagonal structure possess excellent photoluminescence emission characteristics. Under near infrared (NIR) light irradiation, the Yb3+ ions act as sensitizers to absorb the NIR light and transform NIR light into ultraviolet (UV) and visible (Vis) light continuously. Hybrid NIR-activated photocatalysts can be fabricated by combining upconversion nanocrystals with various semiconductor nanocrystals. In this paper, NaYF4:Yb,Tm micro-rods were hydrothermally synthesized with oleic acid as capping ligand. The NaYF4:Yb,Tm@CdS composite was fabricated by in situ generation of CdS nanoclusters on the surface of NaYF4:Yb,Tm micro-rods. The morphologies and structures of NaY4:Yb,Tm and NaYF4:Yb,Tm@CdS were characterized by XRD, SEM, TEM, XPS, UV-Vis and PL spectroscopy. The results of photocatalytic experiments indicated that the NaYF4:Yb,Tm@CdS composite displayed photocatalytic activity under NIR irradiation. In comparison with pure CdS, the photocatalytic ability of NaYF4:Yb,Tm@CdS composite under Vis-NIR irradiation was obviously enhanced. 82% of RhB was degraded by NaYF4:Yb,Tm@CdS catalyst within 75 min under Vis-NIR irradiation, which was more effective than pure CdS (65% degradation of RhB).
研究领域:
材料科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Ping Wang,Minmin Wang,Jie Zhang,Chuanping Li,Xiaolong Xu,Yongdong Jin
Colloidal semiconductor quantum dots (QDs) have recently emerged as a good candidate for photocatalytic hydrogen (H2) evolution in water. A further understanding of the factors that can affect and boost the catalytic activity of the QD-based H2-generating system is of great importance for the future design of such systems for practical use. Here, we report on the fine shell thickness engineering of colloidal CdS/CdSe core/shell QDs and its effect on the photocatalytic H2 production in water. Our results show that, with the proper shell thickness, the H2 photogeneration quantum yield (ΦH2) of CdS/CdSe core/shell QDs could reach 30.9% under the illumination of 420 nm light, which is 49% larger than that of the CdS core. Furthermore, the underlying mechanism has also been tentatively proposed and discussed.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xing-Liang Yin,Lei-Lei Li,Da-Cheng Li,Zhong-Jia Li,Yuan-Xu Wang,Xiang-Jin Kong,Jin-Sheng Zhao,Jian-Hua Jiang,Jun-Chao Qian,Dong-Hui Pang,Xin-Xin Du,Jian-Min Dou
Photocatalytic water splitting is considered to be a green H 2 generation approach and has potential to be applied in the future. As a photocatalytic active material for H 2 evolution, CdS is a good candidate. However, the pristine CdS still suffers from low efficiency and poor stability. To address those issues, we developed noble-metal-free CdS@MoS 2 core-shell nanoheterostructures which exhibit outstanding photocatalytic H 2 evolution performance thus far with rate of 62.55 mmol g −1 h −1 , which exceeds that of pristine CdS by a factor of 148. Meanwhile, the photocatalytic stability can be well retained with no deterioration of activity in 24 h reaction. The excellent performance can be reasonably attributed to the low crystallinity of MoS 2 with numerous active sites provided, and the band alignment of CdS and MoS 2 as determined by valence band-XPS and Mott-Schottky plots analysis, which significantly promotes charge transportation and separation. The enhanced photocatalytic stability here should be ascribed to the intimate growth of MoS 2 shells which significantly passivate the surface trap states of CdS cores and thus the photocorrosion is remarkably retarded. This novel strategy will inspire the fabrication of other photocatalytic systems, and may high-efficient photocatalysts be obtained.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2012
·
IF 5.625
Xi Li,Jian Zhu,Hexing Li
The photocatalytic performances of the SnS 2 and the CdS under the irradiation of visible light were investigated by using different organic dyes as reactants. The photodegradation of organic dyes containing N N double bond on the SnS 2 followed a reduction mechanism with photoelectrons via the Sn IV /Sn II transition while the photodegradation of organic dyes containing N N double bond on the CdS and the photodegradation of organic dyes without N N double bond on either the SnS 2 or the CdS followed an oxidation mechanism with O 2 − and OH radicals. The SnS 2 exhibited much higher activity than the CdS during the photocatalytic degradation of organic dyes containing N N double bond, since the reduction of reactant molecules on the SnS 2 surface was much faster than the migration of either the O 2 − or the OH radicals. However, the SnS 2 displayed even lower activity than the CdS in the photocatalytic degradation of other organic dyes without N N double bond, since all these reactions followed the oxidation mechanism and the SnS 2 displayed a lower efficiency than the CdS in producing O 2 − or OH radicals due to the presence of the Sn IV /Sn II transition.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Zhenying Jiang,Lingzhi Wang,Juying Lei,Yongdi Liu,Jinlong Zhang
The application of photo-Fenton process is restricted by the acidic pH and additional hydrogen peroxide (H 2 O 2 ). In order to overcome these drawbacks, a photo-Fenton system of CdS/rGO/Fe 2+ which can perform at natural pH with in situ -generated H 2 O 2 has been successfully developed. Highly efficient photo-Fenton degradation of phenol was achieved under the visible light irradiation via the CdS/rGO/Fe 2+ system. Experimental results showed that phenol could be degraded completely in 1 h at natural pH. The plentiful in situ generation of H 2 O 2 was further proved to act as an important role in phenol degradation with the addition of Fe 2+ . The advantages of degradation at natural pH with in situ -generated H 2 O 2 can provide a new prospective to the environmental-friendly Fenton process.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 107
·期 1
·70-82
·
IF 2.326
Wang Kai,Liu Shanchi,Yang Mengxue,Jin Zhiliang
CdS and layered double hydroxides (LDHs) have drawn wide attention for photocatalytic water decomposition due to their abundant structure and excellent properties. The construction of a heterogeneous structure is a widely used method for a single material to overcome their narrow spectral light response and inefficient charge separation. In this work, a CdS/CoAl LDH step-scheme (S-scheme) heterojunction photocatalyst was successfully constructed by coupling CdS and CoAl LDH based on the complementary properties of the two materials. Compared with single CdS and CoAl LDH, the prepared CdS/CoAl LDH composite photocatalyst shows excellent photocatalytic hydrogen production efficiency by efficient use of electrons and holes under visible light irradiation. A significant number of electrons in the S-scheme heterojunction photocatalyst can be efficiently used to participate in water splitting while the holes were consumed by the sacrificial reagent. Therefore, the building of the S-scheme heterojunction eventually improved the efficiency of photocatalyst hydrogen production by efficiently separating electrons and holes. At the same time, our work will provide a new approach for the practical application of such semiconductors.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Wei Zhao,Yuxiang Yang,Yanbin Li,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
The advancement of efficient photocatalysts is essential for tackling global energy and environmental issues. In this work, a unique sheet-on-sheet Cd(OH)2/CdS photocatalyst was synthesized via a facile solution strategy, demonstrating significantly improved photocatalytic performance for H2 generation and Cr(VI) reduction. The optimal 5% Cd(OH)2/CdS obtained an impressive H2 production rate of 3475 μmol·g-1·h-1 under visible light, marking a 6.3 times increase compared to CdS. Additionally, the kinetics of Cr(VI) reduction were markedly accelerated, with a rate constant of 0.2803 min-1, representing a 5.7 times improvement over pure CdS. Moreover, the 2D/2D Cd(OH)2/CdS photocatalyst exhibited exceptional stability, maintaining high photocatalytic activity over multiple reaction cycles. Experimental findings and DFT calculations revealed the charge transfer mechanism between CdS nanosheets and Cd(OH)2 cocatalyst. This work provides insights into designing high-performance CdS-based nanophotocatalysts for water splitting and environmental remediation.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 2
·893-902
·
IF 2.371
Wang Desong,Xu Zexuan,Luo Qingzhi,Li Xueyan,An Jing,Yin Rong,Bao Cai
An efficient visible-light photocatalyst was successfully synthesized by surface-hybridizing graphitic carbon nitride (g-C 3 N 4 ) using a small amount of cadmium sulfide (CdS) nanoparticles. The CdS/g-C 3 N 4 nanocomposites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy, and photocurrent–time measurement. The photocatalytic activity of the CdS/g-C 3 N 4 nanocomposites was investigated by evaluating the degradation of Rhodamine B (RhB) under visible-light irradiation. The effects of the CdS content on the nanocomposites, initial RhB concentration, pH value of the investigated system, and dosage of CdS/g-C 3 N 4 nanocomposites on the visible-light photocatalytic activity were systematically investigated. The results revealed that the visible-light photocatalytic activity of g-C 3 N 4 -based photocatalysts was significantly improved by surface-hybridization of a small amount of CdS nanoparticles, increased as both CdS content on the nanocomposites and dosage of CdS/g-C 3 N 4 nanocomposites increased, while increased at first and then decreased as both initial RhB concentration and pH value of the investigated system increased. The visible-light photocatalytic mechanism of the CdS/g-C 3 N 4 nanocomposites was discussed.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wei Cai,Jincheng Liu,Yijun Luo,Zewei Liao,Bingjie Li,Xiaoyan Xiang,Yanxiong Fang
The persistent hurdles of charge rapid recombination, inefficient use of light and utilization of sacrificial reagents have plagued the field of photocatalytic hydrogen evolution (PHE). In this research, tiny MoO 2 nanoparticles of 10 nm in diameter were prepared through a straightforward solvothermal approach with a specific ratio of oleylamine and oleic acid as stabilizers. The critical factor in the synthesis process was found to be the ratio of oleylamine to oleic acid. Moreover, a two-phase interface assembly method facilitated the uniform deposition of MoO 2 onto CdS nanorods. Due to the localized plasmonic-thermoelectric effect on the surface of MoO 2 along with its abundant oxygen vacancies , the composite catalyst exhibited outstanding photo-utilization efficiency and an abundance of active sites. The CdS-MoO 2 composite displayed a unique photochemical property in transforming lactic acid into pyruvic acid and generating hydrogen simultaneously. After exposure to artificial sunlight for 4 h, significant values of 4.7 and 3.7 mmol⋅g −1 ⋅h −1 were achieved for hydrogen production and pyruvic acid formation, respectively, exceeding CdS alone by 3.29 and 4.02-fold, while the selectivity of pyruvic acid was 95.68 %. Furthermore, the S-Scheme electron transport mechanism in the composites was elucidated using Electron Paramagnetic Resonance (EPR) spectroscopy, radical trapping experiments, energy band structure analysis, and the identification of critical intermediates in the process of selective oxidation. This work sheds light on the design and preparation of high-performance photocatalysts for biorefining coupled with efficient hydrogen evolution.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Maoqing Yu,Xiaojing Zhao,Xiangge Wang,Lichun Chen,Xiangyu Chen,Miaoling Huang,Wen-Jie Chen,Xiaoyang Pan
Piezocatalytic hydrogen evolution represents a promising strategy for generating sustainable energy. The construction of heterojunctions can realize the efficient separation and migration of charges and thus achieve enhanced H2 evolution performance. In this study, we report the fabrication of a CdS-Cd2Nb2O7 (CdS-CNO) heterojunction piezocatalyst with cadmium vacancies aimed at improving hydrogen evolution performance. Cadmium sulfide (CdS) was combined with cadmium niobate (Cd2Nb2O7, CNO) to form a heterojunction through a photodeposition strategy. By regulating the photodeposition time, CdS-CNO nanocomposites with varying CdS contents were successfully obtained. Cadmium vacancies were introduced into the CNO matrix during the photodeposition process, where cadmium ions within the CNO lattice reacted with sulfur ions to form CdS, resulting in the creation of cadmium vacancies. Experimental results demonstrated that the CdS-CNO-4 composite, with an optimized CdS content, exhibited the highest piezoelectric hydrogen production activity of 6.01 mmol·g–1·h–1, which is much higher than those of most previously reported piezocatalysts. The enhanced performance is attributed to the strong internal electric field generated by piezoelectric polarization and efficient charge carrier separation facilitated by the heterojunction and cadmium vacancies. This study aims to provide a strategy for developing highly efficient heterojunction piezocatalysts.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yafeng Xu,Yu Li,Jian Yao,Xiang Liu,Shengbiao Zhang,Shihao Zhang,Shuqin Dong,Yue Yao,Xihong Ding,Meng Wang
Antimony sulfide (Sb2S3) is regarded as a promising candidate for next-generation photovoltaic technology. In recent years, the efficiency of Sb2S3 solar cells has shown significant improvement, however, there still exists a considerable gap from the theoretical efficiency. This is partially due to the relatively high resistivity and parasitic light absorption of the CdS buffer layer, as well as the unsatisfactory crystal orientation of Sb2S3. In this work, a Zn salt additive is added to chemical bath solution of CdS to regulate the growth of CdS film. Elemental analysis indicates that only a small amount of zinc is deposited into the CdS film. The introduction of the Zn salt additive significantly increases the grain size and electrical conductivity of CdS, while also leading to preferential growth of the [hk1] orientation in Sb2S3 film. The low-cost Sb2S3 solar cells with inexpensive carbon electrodes were fabricated. The enhanced quality of the junction, attributed to the Zn salt additive, leads to improved charge transport and suppressed charge recombination in the Sb2S3 solar cells. As a result, the efficiency increases from 4.90% to 5.74%. This work presents a straightforward and efficient approach for the fabrication of superior CdS buffer layers and Sb2S3 solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Photonics Research
·
2025
·
IF 3.9
Xiaodi Luo,Jiahao Li,Zixin He,Xiaofei Ma,Qinggang Qin,Wei Chen,Zhengyu Xu,Zhifan Qiu,Yingjian Wang,Liang Li,Dongfeng Shi
The breakthrough in van der Waals heterojunction diodes composed of 2D and 3D materials for optoelectronic devices has paved the way for advancements in broadband optical imaging. However, fabricating traditional array-based imaging detectors with these materials remains challenging. Cadmium sulfide (CdS), a historically significant semiconductor material, has been extensively used in optoelectronic devices due to its remarkable photoelectric properties and chemical stability. Notably, a unique type-I heterojunction can be formed by combining 2D CdS, prepared through chemical vapor deposition, with the first-generation semiconductor germanium (Ge). His heterojunction photodetector exhibits outstanding photoelectric performance, achieving a responsivity of 54 mA W −1 and a detectivity of 1.4 × 10 9 Jones under zero bias, with a spectral response range spanning from 265 to 1550 nm. Herein, the CdS/Ge heterojunction photodetector with the emerging single-pixel Hadamard algorithm, addressing challenges in nonvisible imaging that conventional imaging systems traditionally encounter, is integrated. This approach facilitates low-sampling-rate image reconstruction across a broad spectral range and under scattering conditions. It is anticipated that this work will significantly contribute to future advancements in broadband imaging applications.
研究领域:
光学工程
·
材料科学
✓ 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）