JOURNAL OF ALLOYS AND COMPOUNDS
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2014
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IF 2.726
Pin Lv,Wuyou Fu,Yannan Mu,Hairui Sun,Shi Su,Yanli Chen,Huizhen Yao,Dong Ding,Tie Liu,Jun Wang,Haibin Yang
TiO 2 film materials have very wide applications in photovoltaic conversion techniques. And, TiO 2 nanotubes array film with nanowires directly formed on top (denoted as TiO 2 NTWs) was prepared by the anodization method. CdS and PbS quantum dots (QDs) were firstly cosensitized on the TiO 2 NTWs array (denoted as (CdS + PbS)/TiO 2 NTWs) by novel successive ionic layer adsorption and reaction (N-SILAR), which only needed a cation mixed solution containing Cd 2+ and Pb 2+ and an anionic solution containing S 2− . This N-SILAR method can not only effectively shorten the experimental time, simplify the experiment procedure and reduce the experiment cost, but also make the material of (CdS + PbS)/TiO 2 NTWs possess the advantages of improving electron transport and reducing chemical erosion. Moreover, the photocurrent of (CdS + PbS)/TiO 2 NTWs was 4.1 mA/cm 2 under an illumination of 100 mW/cm 2 . The most eye-popping part was that the result was 8 times higher than that of the bare TiO 2 NTWs array. The result of photoelectrochemical measurements indicated that this novel material had a potential application in photovoltaic devices.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2024
·Vol. 26
·期 19
·14194-14204
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IF 2.9
Jianhua Zheng,Yiming Gao,Bingbing Wang,Zhenping Guan,Guangming Yin,Heshan Zheng,Yong Li,Xiangyu Cao,Shunji Zheng
Constructing Z-scheme heterojunctions incorporating an exquisite hollow structure is an effective performance regulation strategy for the realization of high quantum efficiency and a strong redox ability over photocatalysts. Herein, we report the delicate design and preparation of a core–shell hollow CdS@CoTiO3 Z-scheme heterojunction with a CdS nanoparticle (NP)-constructed outer shell supported on a CoTiO3 nanorod (NR) inner shell. The in situ growth synthetic method led to a tightly connected interface for the heterojunction between CdS and CoTiO3, which shortened the transport distance of photoinduced charges from the interface to the surface. The promoted charge carrier separation efficiency and the retained strong redox capacity caused by the Z-scheme photoinduced charge-transfer mechanism were mainly responsible for the boosted photocatalytic performance. Additionally, the well-designed core–shell structure afforded a larger interfacial area by the multiple direction contact between CdS and CoTiO3, ensuring sufficient channels for efficient charge transfer, and thus further boosting the photocatalytic activity. As an efficient photocatalyst, the optimized CdS@CoTiO3 nanohybrids displayed excellent 2,4-dichlorophenol (2,4-DCP) and tetracycline (TC) degradation efficiencies of 91.3% and 91.8%, respectively. This study presents a Z-scheme heterojunction based on ecofriendly CoTiO3, which could be valuable for the development of metal perovskite photocatalysts for application in environmental remediation, and also demonstrated the tremendous potential of integrating a Z-scheme heterojunction with the morphology design of photocatalyts.
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APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Qiuhao Li,Xiu-Qing Qiao,Yanlin Jia,Dongfang Hou,Dong-Sheng Li
Design and construction of highly efficient and stable co-catalysts are critical for the photocatalytic H 2 generation from water. In this work, we report the novel CdS/CoMoS x core-shell nanowires (CCMS NWs) prepared by a facile in situ synthesis method. The in situ growth of amorphous CoMoS x shell on the surface of CdS NWs core efficiently promoted the photocatalytic H 2 evolution under visible light irradiation . The optimized CCMS sample containing 15 mol% CoMoS x (CCMS-15) achieves a H 2 evolution rate as high as 477.96 μmol·h − 1 under visible light irradiation, up to 26.3 times over bare CdS (18.2 μmol·h − 1 ). Moreover, the constructed core-shell CdS/CoMoS x photocatalyst shows a long-term stability without noticeable activity degradation. Based on the detailed analyses of PL , UV–vis DRS , transient photocurrent responses, EIS, Mott-Schottky plots and ESR , the significantly enhanced activity is ascribed to the synergistic effect of increased visible light absorption , suppressed photo-generated charge carries recombination and the amorphous defective structure of CoMoS x co-catalyst. In consideration of its facile synthesis, low cost, and superior performance, the amorphous CoMoS x appears to be promising co-catalyst for photocatalytic water splitting.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 29
·9634-9642
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IF 4.099
Shuqi Lu,Shanglong Peng,Zhiya Zhang,Yunlong Deng,Tianfeng Qin,Juanjuan Huang,Fei Ma,Juan Hou,Guozhong Cao
Surface passivation in quantum dot-sensitized solar cells (QDSSCs) plays a very important role in preventing surface charge recombination and thus enhancing the power conversion efficiency (PCE). ZnSe passivation with dopant in CdS/CdSe co-sensitized QDSSCs has been demonstrated as an effective way to improve the PCE. In the present study, a series of characterizations revealed that a Mn-doped ZnSe passivation layer can not only reduce surface charge recombination, but also enhance light harvesting. By means of density functional theory calculation along with a systematic study of electronic band structure, it has been found that the valence band of ZnSe moves upward on Mn-ion doping which leads to acceleration of charge separation and broader light absorption range. The impact of the Mn ion on charge recombination and light harvesting has been interpreted reasonably and the PCE of CdS/CdSe co-sensitized QDSSCs with Mn-doped ZnSe passivation layer is as high as 6.46%, which is 1.5 times that of the solar cell without the passivation layer.
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高影响因子
Nano Energy
·
2017
·
IF 12.343
Yu Yu,Yi Huang,Yifu Yu,Yanmei Shi,Bin Zhang
The ever-increasing desire for clean and renewable energy has triggered the development of novel materials for photoelectrochemical (PEC) water splitting. However, elaborate design of photoanode materials with high light-harvesting capability, high charge-separation efficiency and long-term stability for converting solar energy into hydrogen fuel is highly challenged. Herein, we fabricated the self-supported gradient oxygen-doped three-dimensional (3D) CdS branched nanorod array (Grad-O CdS), in which a continuous built-in band bending structure was constructed by gradually oxygen doping. The kinetically-confined anion exchange under non-equilibrium condition was confirmed to be critical to achieve the gradient doping. The obtained Grad-O CdS exhibited a large photocurrent density of 6.0 ± 0.1 mA cm −2 at 0.4 V vs. RHE , which could be maintained for over 42 h. Such excellent performance and stability can be attributed to the efficient separation of charge carriers, which benefits from its continuous built-in band bending caused by oxygen doping, and enhanced light-harvesting capability derived from the narrowing band gap and 3D hierarchical structure. This gradient doping strategy provides a valuable guideline for the design of efficient photoelectrode materials for the conversion of solar energy.
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CHINESE JOURNAL OF CATALYSIS
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2026
·
IF 17.2
Qinghua Liu,Peiqing Cai,Hengshuai Li,Xue-Yang Ji,Dafeng Zhang,Xipeng Pu
S-scheme heterojunctions can offer an effective strategy for spatially separating photogenerated charge carriers, thereby sig F nificantly enhancing photocatalytic performance. In this study, cadmium sulfide (CdS)/copper tungstate (C F uWO 4 ) (CdS/CW) S-scheme heterojunction photocatalysts with adjustable components were fabricated by decorating CdS nanorods with CuWO 4 nanoparticles. The optimal hydrogen evolution rate (2725.91 μmol g –1 h –1 ) of CdS/CW-10% with excellent cycling stability under visible light is 10.1-fold higher than pure CdS. Density functional theory calculations and photoelectrochemical analyses confirmed that the S-scheme charge-transfer mechanism from CdS to CuWO 4 is responsible for the enhanced photocatalytic performance by promoting charge separation. Additionally, the photothermal effect of CuWO 4 increased the local temperature of the photocatalyst, further accelerating the reaction kinetics. This study highlights a dual-enhancement approach based on interfacial charge modulation by constructing an S-scheme heterojunction and photothermal activation, providing valuable insights into the design of high-efficiency S-scheme photocatalysts for solar-driven hydrogen production.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
·
IF 5.4
N.N. Zhen,K.H. Chen,M.T. Li,F. Wen,Q.Y. Deng
Ultra-high-molecular weight polyethylene (UHMWPE) is the most widely used friction material for artificial joints. Polyethylene debris generated during its use is the main reason behind the aseptic loosening of artificial joints. Improving the wear resistance of UHMWPE and reducing debris generation have been the focus of research in this field. Inspired by the structure of natural cartilage and based on our previous research, we developed a new type of porous UHMWPE-based artificial joint material doped with copper-containing carbon dots (Cu-CDs). In a protein-containing lubricating medium, this material exhibited auto-antifriction properties by absorbing/releasing the lubricating medium and forming a protein film on the tribo-interface. These effects can significantly enhance the wear resistance of UHMWPE. The results showed that spherical Cu-CDs with an average size of 5–6 nm were successfully prepared. The tensile strength of the porous UHMWPE doped with Cu-CDs (Cu-CDs@UHMWPE) (approximately 9.93 MPa) was close to that of natural joint cartilage. Cu-CDs@UHMWPE promoted the adsorption of proteins by the friction interface and formed a protein film that reduced wear. Under the same friction conditions, the wear index of Cu-CDs@UHMWPE was approximately three times lower than that of pure UHMWPE. This study showed that UHMWPE can be imbued with the ability to form protein films to enhance wear resistance, and these findings provide experimental and theoretical evidence for the development of novel biomimetic artificial joint materials.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Jiarun Liu,Xinyi Lu,Zhe Liu,Jinying Li,Chunwei Yang
S vacancies and Z-scheme heterojunction synergize in CdS/MoS 2 for visible-light H 2 evolution at 4464.5 μmol·g -1 ·h -1 . • S vacancies as e - traps and active sites synergize with Z-scheme, boosting charge separation and surface reactivity. • DFT shows S vacancies enhance interfacial orbital hybridization and lower charge-transfer barrier, confirming Z-scheme. • Optimized composite shows 82% retention after 10 cycles, highlighting defect-heterojunction synergy’s practicality. The integration of defect engineering and heterojunction construction provides a promising strategy for photocatalytic hydrogen evolution. This work addresses the knowledge gap regarding their synergistic effect by constructing a Z-scheme heterojunction between sulfur vacancy-rich CdS (S V -CdS) and MoS 2 . The optimal composite achieved a remarkable hydrogen evolution rate of 4464.5 μmol g -1 h −1 under visible light, which is nearly sixfold enhancement compared to pristine S V -CdS. Mechanistic studies reveal that sulfur vacancies function dually. They act as electron traps to suppress charge recombination and as active sites to facilitate surface reactions. Meanwhile, the established Z-scheme charge transfer pathway, driven by the built-in electric field, enables directional electron migration to MoS 2 while preserving high redox potentials. First-principles calculations, including HSE06 hybrid functional calculations, corroborate these findings. They reveal that sulfur vacancies enhance orbital hybridization between CdS and MoS 2 , lowering the energy barrier for interfacial charge transfer. Additionally, the composite exhibits excellent stability, retaining ∼ 82% of its activity after 10 cycles. This work provides a fundamental insight and a design principle for developing efficient and stable photocatalysts through the combined application of defect and heterojunction engineering. Download: Download high-res image (112KB) Download: Download full-size image
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Dahui Feng,Han Zhao,Yanhua Song,Ruyan Xie,Xiaozhen Zhang,Shuzhe Zhang,Peng Chen,Haifeng Zou
Visible light-driven carbon dot/defect titanium dioxide (CDT) nanocomposites were synthesized utilizing a straightforward solvothermal in conjunction with a wet chemical method. The CDT demonstrated a markedly enhanced capability for dye degradation under visible light, achieving a catalytic activity of up to 0.2485 min−1 for a 20 mg L−1 rhodamine B (RhB) solution, which is 21.6 times greater than that of commercial TiO2 (P25). The observed enhancement in visible light photocatalytic activity is attributed to the synergistic effects of oxygen vacancies and carbon dots (CDs), which synergistically improved the CDT's response to visible light and mitigated charge carrier recombination. The defects induced by oxygen vacancies function as electron capture centers, optimizing the bandgap structure and effectively facilitating the separation of electrons and holes. Meanwhile, the loading of CDs effectively modulated the concentration of oxygen vacancies, significantly enhancing the carrier separation efficiency and migration rate of the composites. Moreover, under various environmental conditions and across multiple cycles, the material consistently exhibited commendable degradation efficiency, high catalytic activity, cycling stability, and robust resistance to environmental interference in the degradation of RhB. Notably, free radical capture experiments indicated that the primary active species in the photodegradation process transitioned from superoxide radicals (˙O2−) and hydroxyl radicals (˙OH) to superoxide radicals (˙O2−) and holes (h+), thereby confirming the existence of a type II heterojunction at the interface between the CDs and TiO2, and proposing a plausible photocatalytic mechanism. This study presents an effective, environmentally friendly, and convenient methodology for the preparation of efficient photocatalytic composites characterized by defects and heterojunctions, thereby significantly advancing the research and application of catalysts for the removal of recalcitrant organic pollutants under visible light.
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GREEN CHEMISTRY
·
2026
·
IF 10.6
Zixu Hu,Wenjun Jiang,Yuxin Zhang,Ao Xu,Yangjie Wu,Liang Zhou,Juying Lei,Jinlong Zhang
The interfacial interaction between catalysts and substrate molecules plays a pivotal role in enhancing photocatalytic hydrogen evolution efficiency. Rational surface design and modification of photocatalysts can effectively reduce the activation energy barriers, enabling sustainable and high-performance hydrogen production. In this work, hydroxyl (-OH) groups were engineered into NiMoO 4 using a straightforward solvothermal method, resulting in an optimized interfacial microenvironment that promoted favorable reaction kinetics for enhanced photocatalytic hydrogen evolution. The incorporated -OH groups form hydrogen bonds with H 2 O molecules, creating a unique micro-environment that facilitates water molecule enrichment, activation, and dissociation. Notably, hydroxylation induced electronic structure modulation through charge redistribution, generating highly active Ni sites that lower the energy barrier for hydrogen reduction. The optimized hydroxylated NiMoO 4 /CdS (HNCS) composite photocatalyst exhibited exceptional photocatalytic performance, achieving a hydrogen evolution rate of 89.37 mmol g -1 h -1 with an apparent quantum yield (AQY) of 69.0% at 475 nm. The results demonstrate that hydrogen is predominantly derived from water, with lactic acid (LA) undergoing selective oxidation to form the high-value platform chemical pyruvic acid (PA). Notably, the system proves applicable to the aqueous-phase reforming of polylactic acid (PLA), achieving simultaneous hydrogen production and conversion of plastic waste into useful chemical products. This work provides fundamental insights into the mechanistic role of surface functional groups in promoting photocatalytic hydrogen generation.
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ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yanqing Cong,Jiaxin Yi,Shengna Liang,Feng Zhang,Yi Zhang,Shi-Wen Lv
Bimetallic oxides with spinel structure show great prospects in the photocatalysis owing to many active sites. Herein, a novel 500NiCo 2 O 4 @CdS–5%Ag composite was fabricated via a feasible strategy. Interestingly, the combination with NiCo 2 O 4 could significantly enhance the absorption ability of CdS for visible light. Benefiting from the formation of heterojunction structure between NiCo 2 O 4 and CdS, the recombination of photogenerated electrons and holes was remarkably restrained. As an effective mediator, deposition of Ag could further promote the transfer of photogenerated charge carriers, thereby accelerating the reaction rate. Meanwhile, light absorption capacity of composite was also improved, owing to the surface plasmon resonance effect of metallic Ag. More importantly, 500NiCo 2 O 4 @CdS–5%Ag composite with great stability displayed an excellent performance in the photocatalytic degradation of OFX, and its highest removal efficiency was as high as 99.14%. Possible degradation pathways of OFX were given, and most of OFX could be degraded into CO 2 , H 2 O and other by-products with no toxicity. Significantly, the separation and transfer of photogenerated charge carriers followed indirect Z-scheme heterojunction mechanism. The O 2 − , OH and 1 O 2 were main active species in photocatalytic reaction system. All in all, current work inspired some new ideas for designing novel photocatalytic system in wastewater treatment .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Chunhua Liang,Chuantao Wang,Kaixuan Xu,Hongbin He,Qiangen Li,Chunming Yang,Xiaoming Gao
The benzaldehyde (BAD) produced by the benzyl alcohol (BA) oxidation method is comprehensively applied to food and pharmaceutical fields. However, the selectivity and conversion of photocatalytic selective oxidation of BA in aqueous solution are still far from expectation. Herein, N-CQDs/CdS composites were synthesized by the in-situ precipitation method. N-CQDs served as an "Electronic Warehouse" to boost the separation efficiency of the carrier. The electron transferred from CdS to N-CQDs made electron on the N-CQDs surface enrich, which was conducive to the formation of superoxide radicals (·O 2 - ).·O 2 - and h + could efficiently oxidize BA to BAD. In addition, according to density functional theory (DFT), the adsorption energies of BA and BAD on N-CQDs/CdS were distinctly greater than that of CdS. BAD tended to desorb from the 7.5 N-CQDs/CdS surface, and BA preferred to adsorb on the CdS surface. However, BAD was difficult to desorb from the CdS surface, resulting in the poisoning of CdS. 7.5 N-CQDs/CdS exhibited the BA conversion of 60.4% and BAD selectivity of 99%, which was 2.2 times higher than that of original CdS. This work was expected to provide a theoretical basis for improving photocatalyst carrier separation efficiency and alcohol selective oxidation performance.
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