Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 3
·1124-1137
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IF 9.931
Liangxin Zhu,Chong Chen,Fumin Li,Zhitao Shen,Yujuan Weng,Qingsong Huang,Mingtai Wang
To improve the charge separation and transport efficiency in perovskite solar cells (PSCs) with a TiO2-based hybrid mesoscopic/planar architecture, CdS and Cd(SCN2H4)2Cl2 are incorporated into the CH3NH3PbI3 active layer through in situ synthesis to prepare CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction films for PSCs. The incorporated CdS and Cd(SCN2H4)2Cl2 improve the quality of perovskite films. Moreover, Cd(SCN2H4)2Cl2 can effectively reduce the defect state density on the CH3NH3PbI3 crystal surface, which decreases charge recombination and facilitates charge transport in PSCs. Furthermore, first-principles calculations show that the I atom of CH3NH3PbI3 has a strong interaction with the Cd atom of CdS, which induces interfacial charge redistribution and charge transfer at the CH3NH3PbI3/CdS interface and therefore decreases the energy of the CH3NH3PbI3:CdS composite system, leading to more efficient electron–hole separation and improved structural stability of the perovskite bulk-heterojunction film. For the above reasons, the CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction cell shows much higher efficiency and better stability than the PSCs with pure CH3NH3PbI3. The highest efficiency reaches 20.1%, which is 1.16 times that (17.3%) of the PSCs with pure CH3NH3PbI3 and is also much higher than those of previously reported CH3NH3PbI3 PSCs with a compact/mesoporous TiO2 film. Our research results may provide a new understanding for improving the structural stability and performance of PSCs.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 47
·23732-23742
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IF 7.443
Li Zhang,Xianliang Fu,Sugang Meng,Xiaoliang Jiang,Jinghui Wang,Shifu Chen
Noble metal-modified CdS is one of the most promising photocatalysts for solar H2 production due to its intrinsic band structure merits. It is highly desirable to develop an effective preparation route to pursue a high photocatalytic performance and to minimize the use of costly noble metals. For the first time, a simple and convenient one-pot solvothermal (OPS) method was developed to prepare platinized CdS nanorods (Pt/CdS-N) in this work. The formation of a hexagonal 1D structure CdS and the deposition of Pt(0) can be achieved simultaneously by the method, which is more efficient than the conventional post-deposition routes, such as photochemical reduction and impregnation–reduction methods, to enhance the photocatalytic activity of CdS-N for the H2 evolution reaction (HER). The H2 evolution rate (rH2) of CdS-N could be remarkably improved from 2.10 to 10.29 mmol h−1 g−1 by loading with only 0.06% Pt (wt%) under visible light irradiation (λ > 400 nm, 300 W Xe lamp). No deactivation of the sample was observed in cyclic experiments for 20 h reaction. This loading amount of Pt is substantially lower than the reported optimal values (commonly in the range of 0.5–2%) by more than one order of magnitude. A criterion of enhancement coefficient was proposed to identify the ideal loading amount of Pt. The result indicates that, considering the improvement efficiency of rH2 and the loading amount of Pt, this ultra-low amount of Pt is more practical than the optimal amount (determined to be 0.5%). The high and stable activity of Pt/CdS-N can be attributed to the hexagonal 1D structure of CdS and the high dispersion of Pt in the Pt(0) state. Besides Pt, the OPS method is also valid for the deposition of Pd or Ru on CdS and rH2 decreases in the order Ru/CdS-N (12.89) > Pt/CdS-N (10.29) > Pd/CdS-N (6.72 mmol h−1 g−1) with a loading amount of 0.06%. It reveals that the use of noble metal co-catalysts can be significantly reduced without unduly sacrificing the HRE efficiency. The developed OPS route provides a new insight into the preparation of highly efficient and stable chalcogenide photocatalysts for the HER.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Sheng Zhang,Zhang Lan,Jihuai Wu,Xin Chen,Caiyan Zhang
TiO 2 quantum dots (QDs) are synthesized and used to prepare thin films as novel blocking layers (TiO 2 -QD-BLs) at conductive glass/TiO 2 interfaces by spin coating method. The electron recombination at conductive glass/polysulfide electrolyte interfaces can be reduced significantly after the insertion of TiO 2 -QD-BLs in the photoelectrodes. The effects of different thickness of TiO 2 -QD-BLs on photovoltaic performance of CdS QDs sensitized solar cells are investigated. It is found that the cells with 641 nm thick TiO 2 -QD-BLs show the highest power conversion efficiency of about 3.66% under full sunlight illumination (100 mW cm −2 , AM 1.5 G), which is obviously higher than that of the cells without TiO 2 -QD-BLs in the photoelectrodes (1.99%).
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Science China-Materials
·
2015
·Vol. 58
·期 9
·693-703
·
IF 0
Liu Jian,Zhao Yuheng,Liu Jialong,Wang Shouguo,Cheng Yan,Ji Muwei,Zhou Yuanmin,Xu Meng,Hao Weichang,Zhang Jiatao
Heterovalent doping represents an effective method to control the optical and electronic properties of semiconductor nanocrystals (NCs), such as the luminescence and electronic impurities (p-, n-type doping). Considering the phase structure diversity, coordination varieties of Cu atoms in Cu 2 S NCs, and complexity of Cu doping in II-VI NCs, monodisperse Cu 2 S NCs with pure hexagonal phase were synthesized firstly. Then through cation exchange reaction between Cd ions and well-defined Cu 2 S NCs, dominant Cu(I) doped CdS NCs were produced successfully. The substitutional Cu(I) dopants with controllable concentrations were confirmed by local atom-specific fine structure from X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) spectroscopy, elemental analysis characterizations from X-ray photoelectron spectroscopy (XPS) and the electron spin resonance (ESR) measurement. The dominant and strong Cu(I) dopant fluorescence was verified by their absorption and photoluminescence (PL) spectra, and PL lifetime. Finally, the band positions and the p-type conductivities of the as-prepared Cu 2 S and Cu(I) doped CdS NCs were identified by ultraviolet photoelectron spectroscopy (UPS) measurements. The high monodispersity of NCs enables their strong film-scale self-assembly and will hasten their subsequent applications in devices.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xin-He Duan,Hong-Wei Li,Yi Li,Zhijiu Huang,Sha Liu,Yuqing Wu
Acetaldehyde (AH) is defined as a carcinogen, the widely existence in alcoholic beverages has led its determination an essential aspect related to human health. Fluorine doped carbon dots (dF-CDs) is developed, which process light-activated oxidase-mimic property and high stability at acidic condition. Under the UV irradiation, dF-CDs generate reactive oxygen species (ROS) to oxidize o -phenylenediamine (OPD) into 2,3-diaminophenazine (DAP), showing absorption peak at 450 nm and strong emission at 577 nm, meanwhile, the produced DAP quenches the original emission of dF-CDs at 455 nm via an inner filter effect (IFE). However, the introduction of AH inhibits such processes efficiently, thereby establishing a colorimetry and ratiometric fluorescence method for AH determination. Of note, this dual-responsive method has been used for the accurate AH determination in Chinese Baijiu . Therefore, the developed method not only provide a dual-sensing platform to determine AH, but also extends the applications of CDs in food analysis.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hongli Yang,Rui Wang,Huilin Hou,Yang Li,Zhuodong Li,Haiyan Wang,Xiaoqiang Zhan,Dongdong Zhang,Zhao Liang,Yong Luo,Weiyou Yang
The integration of S-scheme heterojunctions and solid solutions presents a dual-driven strategy for efficient charge transport, thus facilitating superior spatial separation and mobility of photogenerated carriers for overall enhanced photocatalytic behaviors. In this work, the photocatalysts of CdS@N-NiCoO (CdS@NCO) were rationally designed, by combining the ultrafine CdS nanoparticles with N-doped NiCoO (NCO) porous microrods derived from a metal organic framework (MOF) precursor. It is verified that the incorporated N dopants and Co-induced impurities could optimize the electronic structure of solid solution, thereby enhancing the charge separation and mobility of photogenerated carriers. Moreover, according to the UPS and in-situ XPS analyses, the formed S-scheme heterojunction based on n -type CdS ensures the efficient electron-hole separation with improved redox potentials. The resultant photocatalysts achieve an outstanding hydrogen (H 2 ) evolution rate of 4632 μmol·g −1 ·h −1 , which is ∼ 26 times to that of pristine NCO, and outperforms those of most NiO- and Co 3 O 4 -based photocatalysts ever reported. Current work might provide some insights on exploring advanced photocatalyst for efficient and sustainable H 2 production, enabled by the synergistic effect between heterojunctions and solid solutions.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Sijia Xie,Qiyu Lei,Linyu Zeng,Hai Xiong
An efficient mimic peroxidase platform of Fe-CDs/GOx based on the hybrid cascade system to produce in-situ H 2 O 2 for the visualized detection of glucose has been also developed in our group. Herein, the [Fe-CDs + H 2 O 2 + TMB] system was further performed to detect the biothiols (GSH, Cys, and Hcy) as representatives of the –SH group. The result exhibits that the higher concentration of biothiols can cause the absorbance signal at 652 nm to decrease, and the deep-blue color of oxTMB turns green until it is faded in 20 min by the naked eye. The colorimetric method showed the LOD are 0.54, 0.29, and 1.41 μM for GSH, Cys, and Hcy respectively, without interference in the presence of other amino acids. The smartphone-based and paper-based determination display good respect for biothiols in human serum or GSH in red wine. These simple and convenient strategies provide potential applications in the fields of clinical diagnosis and foods.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Luping Feng,Enjun Chen,Xinfeng Li,Jianghong Wang,Yujie Fan,Leyao Jin,Peisong Tang,Lixiang Zhang
A bifunctional 0D-2D nanostructured S-scheme CdS-Bi 2 WO 6 heterojunction for highly efficient photoelectrochemical (PEC) detection coupled with the degradation of chlorpyrifos (CP) was prepared by hydrothermal growth of CdS quantum dots onto Bi 2 WO 6 nanosheets. It was uncovered that the so-obtained heterojunction composites notably minimized the recombination of photoinduced electron-hole pairs and exhibited much improved PEC responses compared to pristine Bi 2 WO 6 because of the in-situ formed internal electrostatic field between CdS and Bi 2 WO 6 components induced by the S-scheme heterostructure. After the addition of CP, the interactions between Bi sites and the P=S/C=N groups of CP specifically inhibited the photocurrent signals of obtained CdS-Bi 2 WO 6 sample, impeding the separation and transfer of photoinduced carriers. Significantly, it was found that the photo-generated holes in Bi 2 WO 6 and • OH radicals produced within the PEC system could effectively interact with CP molecule, enabling simultaneous catalytic degradation during detection process and the possible intermediates and degradation pathways of CP were explored and speculated. As a result, a bifunctional PEC platform was introduced for the sensitive and efficient detection and degradation of CP. This platform holds potential to offer theoretical support for the monitoring and remediation of other organophosphate pesticides like CP.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Yining Bao,Qingru Zeng,Shunyan Ning,Wei Zhao,Longfei Wang,Xinpeng Wang,Yuezhou Wei,Deqian Zeng
Developing effective heterojunction photocatalysts that efficiently separate charge carriers and improve light-harvesting capabilities is crucial in addressing energy and environmental issues. Herein, a unique nanocomposite photocatalyst is constructed by attaching CoMn 2 O 4 nanoparticles onto 2D CdS nanosheets for H 2 production and U(VI) reduction. The optimized 2% CoMn 2 O 4 /CdS nanocomposite showcases the highest photocatalytic H 2 production efficiency, 5.8 times higher than CdS nanosheets . Additionally, the U(VI) reduction rate constant of 2% CoMn 2 O 4 /CdS is 0.0192 min −1 , approximately 1.9 folds over the pristine CdS (0.0101 min −1 ). The exceptional photocatalytic performance toward photocatalytic H 2 evolution and U(VI) reduction reactions directly result from the electronic integration between CoMn 2 O 4 /CdS p-n heterojunction, facilitated by the efficient photoexcited charge separation. Feasible photocatalytic mechanisms are proposed through experimental analyses and theoretical calculations. This study provides a straightforward method for designing effective CdS-based heterostructured photocatalysts, contributing to the advancement of solar-to-H 2 conversion and environmental abetment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lan Wang,Feng Yue,Shuo Zhang,Cong Li,Bang Tan,Jingjing Du,Baodan Jin,Xiaojing Zhang,Yongpeng Ma,Hongzhong Zhang
A novel photoelectrochemical (PEC) sensor was developed for the ultra-sensitive and highly selective detection of hydroquinone (HQ), featuring a composite structure that combines 0D CdS nanoparticles with a 3D flower-like ZnIn 2 S 4 microsphere . The sensor, termed rMIP/CdS/ZnIn 2 S 4 , employed molecularly imprinted polymers (MIPs) to achieve specific recognition of HQ. An p-phenylenediamine (pPD) polymer film was electrochemically polymerized onto the surface of the CdS/ZnIn 2 S 4 composite-coated glassy carbon electrode (GCE). Through hydrogen bonding, HQ molecules were imprinted onto the polymer film. Subsequent elution removed these molecules, leaving behind specific recognition sites, enabling selective detection of HQ. The unique spatial structure and heterojunction properties of the 0D CdS nanoparticle/3D flower-like ZnIn 2 S 4 composite, combined with molecular imprinting, significantly enhanced the photocurrent response and increased the selectivity and sensitivity for HQ detection. Under optimal conditions, the rMIP/CdS/ZnIn 2 S 4 sensor demonstrated a low detection limit (0.7 nmol·L −1 , S/N=3) over a wide linear range of 1–1200 nmol·L −1 . The sensor was successfully applied to detect HQ in real water samples, showing promise for environmental pollution control applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shasha Zhang,Pengfei Zhu,Ming Duan,Bing He,Xinglin Li,Xiya Xin
In this paper, a novel direct Z-scheme heterojunction La-Bi 2 WO 6 /CdS composed of 3-dimensional flower-like Bi 2 WO 6 and hexagonally stacked succulent CdS was successfully designed and synthesized. The morphology, optical properties, element valence and crystal structure of the catalysts were systematically characterized. When the dosage of LBC-40 was 1.0 g/L, the degradation rate of oxytetracycline (OTC, 20 mg/L, pH = 6) was 85.28 %, under low visible light illumination (65 W energy saving lamp) for 120 min and the reaction kinetic constant (0.01336 min −1 ) was 2.50 and 1.56 times that of pure Bi 2 WO 6 and La-Bi 2 WO 6 , respectively. Moreover, La-Bi 2 WO 6 /CdS showed good photocatalytic activity for other single antibiotics, mixed antibiotics and antibiotics from different water sources. The photocatalytic activity only decreased by 7.69 % after 3 cycles. Furthermore, the possible photocatalytic degradation pathway and photocatalytic mechanism of OTC were proposed. The excellent photocatalytic performance of La-Bi 2 WO 6 /CdS is for that the doping of La 3+ and the construction of direct Z-scheme heterojunction enhances the visible light absorption capacity and separation efficiency of photogenerated electron-hole pairs. This paper reports a new method, which can provide a reference for the design and development of visible light responsive photocatalysts with excellent photocatalytic properties.
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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.
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