Frontiers in Chemistry
·
2022
·
IF 5.545
Yang Shuhui,Ke Xi,Zhang Menglong,Luo Dongxiang
Metal nanoparticles have been extensively used as co-catalysts in photocatalytic systems in order to pursue improvements in both reaction kinetics and selectivity. In this work, PdAg dual-metallic nanoparticles synthesized by the co-reduction method were decorated on a well-established α-Fe2O3/CdS Z-scheme photoactive material as a co-catalyst to study their performance for promoting the photoreduction of CO2. Herein, α-Fe2O3 and CdS were in situ synthesized on fluorine-doped tin oxide (FTO) glass by hydrothermal and SILAR (successive ionic layer adsorption and reaction) methods, respectively. The direct Z-scheme charge transfer path between Fe2O3 and CdS and the effective electron migration toward the PdAg mainly contributed to the excellent photocatalytic CO2 reduction performance. The controllable work function based on Pd (5.12) and Ag (4.26) constructed an appropriate band alignment with α-Fe2O3/CdS and displayed favorable production for CH4 rather than CO. The optimum ratio of PdAg 1:2 performed a 48% enhancement than pure Pd for photoreduction of CO2. Meanwhile, the enhanced charge separation improved the photoelectrochemical performance and photocurrent generation, and reduced the electrical resistance between components. This work provided insights into the dual-metallic co-catalyst for boosting the activity and selectivity of photocatalytic CO2 reduction.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Jiayong Zhang,Ting Wang,Bin Yao,Zhanhui Ding,Yongfeng Li,Chunkai Wang,Jia Liu
High carrier recombination at the Cu2ZnSn (S, Se)4(CZTSSe)/CdS interface is the critical issue that results in the low power conversion efficiency (PCE) of CZTSSe solar cells. To reduce the recombination by optimizing the CZTSSe/CdS interfacial structure, we fabricated a Zn doped CdS (ZnxCd1 – xS) thin film with x of 0–0.32 and a CZTSSe solar cell with the ZnxCd1 – xS as the buffer layer. It is found that Zn substitutes for Cd in the x range of 0–0.26 and that some of the Zn substitutes for Cd and another Zn locates in the interstitial site of the CdS lattice in the x range of 0.26–0.32, which make the lattice mismatch between CZTSSe and ZnxCd1 – xS decrease in x of 0–0.26 and increase in x of 0.26–0.32. The conduction band offset at the CZTSSe/ZnxCd1 – xS interface is demonstrated by XPS to be a positive ″spike″-like type and increases from 0.11 to 0.43 eV as x increases from 0 to 0.32. PCE is increased from 5.00 to 7.73% by optimizing x. The increased PCE is attributed to increased open-circuit voltage (VOC) and filling factor (FF), while the decreased PCE is due to decreased VOC, FF, and JSC. By using quantitative analysis methods, the increased VOC and FF are mainly attributed to the increased shunt resistance (Rsh) and decreased reverse saturation current density (J0), and the decreased short-circuit current density (JSC) is attributed to the increased conduction band offset (CBO). The influence mechanism of Zn doping on Rsh, J0, and CBO is discussed.
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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.
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PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2020
·Vol. 16
·期 6
·996-1002
·
IF 2.831
Zhang Rui,Li Gang,Zhang Yue
In this study, we decorated CdS on the surface of MIL-125(Ti) using a photochemical method to prepare the CdS-MIL-125(Ti) nanocomposites. The obtained samples were characterized by a series of techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) spectra, electrochemical measurements and UV-Vis diffuse reflectance spectra (DRS). The results show that the CdS nanoparticles were highly dispersed on surface of MIL-125(Ti). The combination will promote the separation of electron–hole pairs and increase the dispersity of CdS. The nanocomposites were subsequently used as photocatalysts in the selective oxidation of benzyl alcohol to benzaldehyde using the molecular oxygen as the oxidant. The nanocomposites show excellent performance in the photocatalytic reaction under visible light irradiation. The conversion of benzyl alcohol to benzaldehyde was about 20.1% with no by-products observed.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Danyun Xu,Pengtao Xu,Yuanzhi Zhu,Wenchao Peng,Yang Li,Guoliang Zhang,Fengbao Zhang,Thomas E. Mallouk,Xiaobin Fan
Monolayer WS2 has interesting properties as a direct bandgap semiconductor, photocatalyst, and electrocatalyst, but it is still a significant challenge to prepare this material in colloidal form by liquid-phase exfoliation (LPE). Here, we report the preparation of 1–2 layer semiconducting WS2 nanosheets in a yield of 18–22 wt % by a modified LPE method that involves preintercalation with substoichometric quantities of n-butyllithium. The exfoliated WS2 nanosheeets are n-type, have a bandgap of ∼1.78 eV, and act as a cocatalyst with CdS nanorods in photocatalytic hydrogen evolution using lactate as a sacrificial electron donor. Up to a 26-fold increase in H2 evolution rate was observed with WS2/CdS hybrids compared with their pure CdS counterpart, and an absorbed photon quantum yield (AQE) of >60% was measured with the optimized photocatalyst.
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 42
·6842-6847
·
IF 4.776
Panpan Gai,Shuxia Zhang,Wen Yu,Haiyin Li,Feng Li
Herein, a light-driven self-powered biosensor based on a photoelectrochemical enzymatic fuel cell (PEFC) was proposed for ultrasensitive organophosphate pesticide (OP) detection. To construct this fuel cell, poly(3,4-ethylenedioxythiophene)-sensitized CdS quantum dot (PEDOT/CdS) photoanode and multiwalled carbon nanotubes/gold nanoparticals/bilirubin oxidase (CNTs/AuNPs/BOD) biocathode were elaborately designed. Initially, the enzyme acetylcholinesterase (AChE) immobilized on the CdS/PEDOT photoanode could hydrolyze acetylthiocholine iodide (ATCh) into thiocholine as the electron donor to enhance the charge separation efficiency; thus, PEFC produced relatively high open circuit voltage (EOCV) upon illumination. OPs could inhibit the AChE enzymatic catalytic activity on hydrolysis, and in this case, a smaller EOCV obtained. Thus, based on the constructed PEFC, self-powered biosensing of OPs was realized, and the detection limit was as low as 0.012 ng mL−1 (S/N = 3), which was comparable or superior to those of the reported methods. In this study, we not only constructed a facile, ultrasensitive and low-cost sensing platform for OP detection, but also provided an ingenious idea for designing light-driven self-powered biosensing based on PEFC.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yuyuan Zhang,Huawen Hu,Wanwen Kang,Guojian Qiu,Ruiyin Liang,Lifang Deng,Haoran Yuan
This study is devoted to the scalable fabrication of a high-performance composite photocatalyst by incorporation of the visible-light-active CdS flowers (with sharp edges exposed) onto a TiO 2 nanotube array (TNA) film on the Ti foil substrate. To evaluate the visible-light-harvesting performance of the prepared hierarchical architecture consisting of the CdS flowers, TNAs, and Ti foil, we subsequently assembled a photoelectrochemical (PEC) cell with membrane electrode assemblies fabricated innovatively by thermocompression. The CdS flowers can efficiently harvest the visible light energy , while TiO 2 collects photoelectrons, effectively separating of the photoexcited electron-hole pairs and hence enhancing the photocatalysis efficiency in the photoelectrochemical conversion and yield of hydrogen production from water splitting. An impressive hydrogen production rate of 22.44 μmol▪h −1 ▪cm −2 was obtained in the PEC cell with the CdS flowers-sensitized TNA film under simulated solar light with an active irradiation area of around 42 cm 2 , thus showing great potential for practical applications.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yiran Cao,Jialin Li,Mengting Chen,Linyuan Zhou,Qiyue Zhang,Weipeng Liu,Yingju Liu
Hydrogels, as an extremely hydrophilic polymer with a network-like cross-linked structure, are considered as a promising material in the field of sensing and detection. In this work, a new ratiometric fluorescence sensor on the basis of the dual-emission of gold nanoclusters (AuNCs) and carbon dots (CDs) was developed to recognize copper ions (Cu 2+ ) and glutathione (GSH). AuNCs with excellent photostability and biocompatibility could electrostatically interact with aminated-CDs@SiO 2 . After adding Cu 2+ , the fluorescence of AuNCs gradually weakened, while the fluorescence of CDs in silicon spheres was basically not affected, thus a fluorescence ratio signal was generated to realize the recognition of Cu 2+ . Subsequently, the strong combination of GSH with Cu 2+ could recover the fluorescence of AuNCs, and a new fluorescence ratio signal was generated to further recognize GSH. The developed ratiometric fluorescence sensor could detect Cu 2+ over a range from 0.5 to 16 μM with a detection limit of 0.25 μM and GSH over a range from 0.05 to 48 μM with a detection limit of 0.035 μM. Such dual-emission CDs@SiO 2 /AuNCs fluorescent probe was located in the visible region, thus a multi-color fluorescent platform for the alternative visual recognition of Cu 2+ and GSH was realized by implanting CDs@SiO 2 /AuNCs in agar gel. The construction of multicolor fluorescent hydrogels can be not only applied to fast and visual on-site sensing, but also used in the bioimaging, information encoding, and other fields.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Hongmin Gao,Ze Zhang,Yingcong Zhang,Hongwei Yu,Shengzhong Rong,Lingqiang Meng,Shizhen Song,Yong Mei,Hongzhi Pan,Dong Chang
Resonance energy transfer (RET), as an efficient strategy, has been widely used for exploring a variety of biological processes and achieving sensitive bioanalysis. In this work, fluorescence and electrochemiluminescence (ECL) RET between graphitic carbon nitride (g-C 3 N 4 ) and NIR CdTe/CdS QDs was reported firstly. Based on this novel RET system, a sensitive sandwich-type ECL immunosensor was constructed to detect cancer antigen 125 (CA125). In this strategy, the ECL of Au NPs-functionalized graphitic carbon nitride nanohybrids (Au-g-C 3 N 4 NHs) was efficiently quenched by near-infrared CdTe/CdS quantum dots (NIR CdTe/CdS QDs), where NIR CdTe/CdS QDs acts as acceptors, and Au-g-C 3 N 4 NHs acts as donors. Au NPs improved the intensity and stability of ECL and provided sites to immobilize the antibody. Silica nanospheres carried abundant NIR CdTe/CdS QDs (QDs-SiO 2 ) labeling secondary antibodies, further enhancing the quenching effect. Under the optimum conditions, the constructed immunosensor showed excellent analytical performance with a linear concentration of CA125 from 0.0001 U mL −1 to 10 U mL −1 and the limit of detection reached 0.034 mU mL −1 (S/N = 3). Meanwhile, the immunosensor also revealed great stability, reproducibility, and selectivity and it could be applied in human serum samples successfully. This strategy provided a useful analytical method for the sensitive detection of biomarkers in the early stages of the disease and an innovative reference for developing more efficient and sensitive RET bioanalysis.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qixiao Gai,Shoutian Ren,Xiaochun Zheng,Wenjun Liu,Quanli Dong
Surface plasmonic resonance effect of Ag nanoparticles (NPs) can enhance the photocatalytic performance of CdS by the injection rate of hot electrons, but their low injection rate and serious carrier recombination of CdS need special attention. In this article, CdS nanosheets are pre-functionalized by L-cysteine (L-Cys) to graft –COO - and –NH 2 groups, followed by the photo-deposition of Ag NPs, and strong chemical bonds are formed between CdS and Ag NPs with L-Cys as bridging ligands. Their optimal hydrogen evolution rate of 29.71 mmol/g/h is 4.13 and 2.30 times that of CdS and CdS-Ag without L-Cys, respectively, and its monochromatic apparent quantum efficiency at 450 nm reaches 27.87%. According to the enhancement factors of L-Cys functionalization, L-Cys acts as bridging ligands to enhance the interfacial injection rate of hot electrons. Meanwhile, the dangling –COO - and –NH 2 groups on CdS can act as efficient co-catalytic centers.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-11
·
IF 5.3
Chen Chao,Zhang Yihao,Gao Sineng,Wang Linfan,Zhang Ting,Li Tingting,Qian Xiaoqing,Chen Da
Fluorine-doped carbon dots (F-CDs) are prepared through a one-pot hydrothermal method starting from ciprofloxacin, exhibiting a bright blue emission at 453 nm under the optical wavelength of 358 nm. The sensitive sensor for detecting Cu 2+ is established based on the fluorescence quenching of F-CDs, which is attributed to the static quenching caused by the formation of non-luminescent complexes between them. The limit of detection (LOD) is 46.2 nM. Meanwhile, a portable fluorescence sensor based on a lateral flow test strip (LFTS) has been developed for practical applications, which allows real-time monitoring of Cu 2+ with a satisfactory limit of detection (LOD) of 69.7 nM in a good linear range of 0.0697–50 μM. In addition, the identification of latent fingerprints (LFPs) based on F-CDs has been developed with the assistance of MATLAB, realizing high-performance fingerprint visualization and recognition. The results serve to underscore that the synthesized F-CDs not only provide a new tool for Cu 2+ detection in real samples, but also show great potential for LFPs visualization and information identification. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zongbo Zhang,Shiliang Song,Yan Ding,Jianhai Yu,Wenting Wu,Jin Li,Xin Wang,Yong Guo,Liang Gong
The precise and controllable preparation of carbon nanomaterials under mild conditions poses a great challenge, especially for metal-catalysed multiphase preparation. This work proposes an efficient method that utilizing high-density ultrasound to enhance the liquid-liquid interfacial reaction system. Iron-doped carbon dots (Fe-CDs) are successfully synthesized in such a normal temperature and atmospheric-pressure reaction condition. It is shown that transient cavitation provides a high-temperature and high-pressure microenvironment for the preparation of Fe-CDs. Moreover, the size of the reactant droplets is reduced from 200.0 ± 17.3 μm to 8.1 ± 2.9 μm owing to the acoustic flow and cavitation effects, which increases the specific surface area of the two reacting phases and improves the mass transfer coefficient by more than 252.0 %. As a result, the yield increases by more than an order of magnitude (from 0.7 ± 0.1 % to 11.9 ± 0.2 %) and the Fe doping rate reaches 20.9 %. The photocatalytic oxidation conversion of 1,4-Dihydropyridine (1,4-DHP) using the obtained Fe-CDs is as high as 98.2 %. This research gives a new approach for the efficient and safe production of Fe-CDs, which is promising for industrial applications.
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