JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2024
·Vol. 39
·期 4
·869-876
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IF 1.3
Zhang Yanwei,Wang Yanze,Li Junguo,Xie Jingjing,Wang Wenxuan,Fu Zhengyi
We synthesized BiVO 4 mesocrystals with ordered assembly structure, and studied the structural order and the relationship between the photodegradation of Rhodamine B. Au nanoparticles (NPs) were successfully loaded onto Meso-BiVO 4 by light-assisted induction, and Cd nanoparticles were further selected to be deposited on Au nanoparticles to form Z-scheme photocatalyst Meso-BiVO 4 -Au-CdS heterostructures. We try and propose to analyze its ordered assembly structure by XRD for the first time. The results show that Meso-BiVO 4 is a mesocrystal with highly exposed (001) plane and directional assembly structure. The charge separation efficiency of all samples was studied by PL spectroscopy. The results show that the Z-scheme Meso-BiVO 4 -Au-CdS can promote the charge separation and obtain the best carrier separation efficiency. Thus, it has the best photocatalytic activity in the experiment of photocatalytic degradation of rhodamine B. The main active species in the degradation process were confirmed by free radical trapping experiment, and the degradation mechanism was put forward.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Min Wang,Haitao Zhao,Limin Zhao,Jianmin Dou,Xingliang Yin
CdS, as a visible-light responsible photocatalyst , has gained considerable attentions for its relatively narrow bandgap and negative conduction band edge. However, its photocatalytic activity is hindered by challenges such as severe charge recombination, insufficient active sites and poor stability. In this work, a robust strategy is proposed to optimize the transfer channel for charge carriers and enhance the active sites by heterojunction and cocatalyst engineering. The well-designed GO/CdS/MoS 2 shows remarkable durability (20 h without significant loss of H 2 production rate) with a high photocatalytic H 2 production rate of 1.45 mmol h −1 g −1 (about 6.6-fold enhancement compared with CdS) at GO content of 0.1 wt% and MoS 2 loading amount of 5.0 wt%. The bolstered H 2 production rate is attributed to the augmented transfer channels of mass owing to the holey structure of GO , the enhanced active sites since the introduction of MoS 2 , and the unidirectional transfer of electrons from CdS to MoS 2 , which is ascribed to the built-in electric field in the CdS/MoS 2 interface. Thanks to the directional transfer of holes from CdS to GO in the GO/CdS interface, the assemblage of holes in CdS is prevented, thus contributing to the amplified stability GO/CdS/MoS 2 . Our findings offer insights for the enhanced photocatalytic activity of CdS based photocatalysts, which may inspire the development of the heterostructure photocatalysts for solar-to-fuel conversion.
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Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Ya-Nan Wang,Yaxin Guo,Jinsong Peng,Jianwei Zhao,Lei Yang,Haiyan Song,Chunxia Chen
s Photocatalytic H 2 O 2 production represents a sustainable and promising avenue for energy and environment. Photoproduction of H 2 O 2 in seawater is potentially an alternative to meet the needs of H 2 O 2 utilization in ocean, while with challenges of competitive ions influence and unsolved photocatalytic mechanism. Herein, we constructed a S-scheme heterojunction with the lamellated WO 3 coated CdS semiconductors for photoproduction of H 2 O 2 in actual seawater. Fragmented WO 3 uniformly spread on surface of dispersed CdS spheres by two steps including calcination and ultrasound. Photocatalyst achieved considerable 1.00 mmol·g cat −1 ·h −1 of H 2 O 2 productivity in seawater without electron-proton donors and pure O 2 , 9.3 % of apparent quantum yield (AQY), as well as good reusability. A co-catalysis concept was proposed to explore specific role of ions in seawater on H 2 O 2 photoproduction. S-scheme heterojunction contributed to migration of electrons and holes on interface between WO 3 and CdS, and further promoted separation of photocarriers, and further opened another channel for H 2 O 2 generation. Accumulated electrons in conduction band (CB) of CdS involved in the main route of two-electron reduction of O 2 for H 2 O 2 production, also promoted generation of •O 2 - for opening the auxiliary route. WO 3 /CdS heterojunction provided fundamentals and opportunities for H 2 O 2 production and applications in abundant seawater as a sustainable way.
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ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Xiaolong Rong,Ying Han,Hao Dai,Haixia Jiang,Yingang Xue
Black phosphorus nanosheets (BPNS), a novel two-dimensional nanomaterial, find extensive applications in the field of photocatalysis. With the prohibition of bisphenol A (BPA), the utilization of bisphenol S (BPS), which is more resistant to degradation than BPA, has been steadily increasing. In this study, few-layer BPNS was prepared using an improved liquid-phase exfoliation method, showcasing its commendable specific surface area and notable adsorption capacity. Subsequently, a new type of nanocomposite material, BPNS-Cadmium sulfide (CdS), was hydrothermal synthesized involving BPNS and CdS. We conducted comparative assessments of BPNS, CdS, and their composite materials to identify the most efficient catalysts. Ultimately, we found that the composite material BPNS-CdS exhibited the highest capability for degrading BPS in an alkaline environment, achieving an impressive degradation rate of 86.9%. Notably, the degradation rate remained higher in an acidic environment compared to a neutral one. Through Electron Spin Resoance (ESR) experiments, it is revealed that BPNS-CdS, when exposed to visible light, generates •O 2 − , •OH, and h + as confirmed. Additionally, we tested and validated the carrier separation and migration abilities of BPNS-CdS while also calculating the band gap for each material. Building upon these results, a possible photocatalysis mechanism experiment was proposed. Finally, the degradation products were analyzed using High-Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS) and put forth a plausible pathway for the BPS degradation, and it was found that 4-Phenolsulfonic acid, Ethyl protocatechuate and Isophthalic acid are the main intermediates of BPS. This study contributes to a deeper understanding of the synergy between non-metallic catalysts like BPNS and metal catalysts like CdS. It also offers new insights into the degradation mechanisms and pathways for BPS.
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PubMed
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ACS Applied Nano Materials
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2024
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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.
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NEW JOURNAL OF CHEMISTRY
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2025
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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.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Mohib Ullah Khan,Afaq Ullah Khan,Sameerah I. Al-Saeedi,Kamran Tahir,Abdulaziz A. Alanazi,Zainab M. Almarhoon,Talal M. Althagafi,Magdi E.A. Zaki,Hassan M.A. Hassan,Mingzai Wu
A binary composite of metal sulfides (MS) is directly synthesized on nickel foam through hydrothermal process, resulting in snow like nanosphere suitable for hybrid supercapacitors (HSCs). Herein, a ZnS/CdS binary composite has been grown directly on nickel foam using a simple hydrothermal method. The structural features, morphological characteristics and electrochemical performance of the composite are systematically investigated. Especially, the highest capacitance of 739–325 F/g at 1–10 A/g was attained with good rate performance. Moreover, a binder-less ZnS/CdS/NF composite achieved a high power of 5030 W/kg at 42 Wh/kg energy density by realizing an expanded voltage to 1.8 V with decent durability. Interestingly, a 92.84 % retention was noticed after 6500 cycles, which indicates high performance stability of the ZnS/CdS/NF||AC HSC. These outcomes reveal the promising prospect of all-metal sulfide utilization for next-generation energy storage devices.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Yi Zhong,Chenhan Zhang,Zhihua Ying,Yuan Jiang,Weiqin Sheng
Nitrogen dioxide (NO 2 ) is a significant air pollutant with a notable environmental impact, necessitating precise monitoring. However, most existing NO 2 sensing materials exhibit low sensitivity and require high-temperature operation. In this study, we employed a hydrothermal and co-precipitation method to synthesize a novel ternary nanocomposite , In 2 O 3 /SnO 2 nanoparticles (NPs)/fluorine-doped carbon quantum dots (F-CDs). By varying the mass ratio of In 2 O 3 to SnO 2 NPs, we investigated the gas-sensing performance of the composite towards NO 2 . The results demonstrate that when the ratio of SnO 2 and In 2 O 3 reaches to 1 : 2, the 2-In 2 O 3 /SnO 2 /F-CDs gas sensor exhibited the highest response, excellent selectivity , and remarkable stability under ultraviolet (UV) light irradiation at room temperature (∼25 °C). Furthermore, the response of the 2-In 2 O 3 /SnO 2 /F-CDs gas sensor displayed a strong linear relationship with the concentration of NO 2 gas. At a NO 2 gas concentration of 3 ppm, the sensitivity was 238, which is significantly higher than that of In 2 O 3 /SnO 2 NPs and In 2 O 3 sensors. The response time and recovery time were measured at 62 s and 33 s, respectively. Finally, based on experimental characterization results and band structure analysis, we confirmed the promising effects of ternary nanocomposite in enhancing gas sensing.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
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IF 18.5
Hui Li,Xinyang Peng,Wanning Xi,Tao Jiang,Ziyang Zhao,Xiaoxuan Yu,Wang Liu,Baiheng Wu,Yan Ge,Zhenhui Qi,Junqiu Liu
The explosive growth of information and its widespread availability underscores the need for robust encryption and anticounterfeiting measures. In this study, CdS quantum dots are engineered (QDs) to manifest multiple visual responses to a single trigger through strategic ligand design. The surface engineering method allows QDs to transition from yellow to black upon photoexcitation-induced electron transfer from Cd(II) to Cd(0). Surface ligands desorption under hole injection, leading to an increase in QDs size and resulting in a redshift in photoluminescence. This photoexcitation-induced redox reaction reveals unprecedented photochromism and photoluminescence phenomena, establishing a foundation for advanced information protection measures. Utilizing these QDs, excellent writing performance under UV irradiation is achieved in solid-state substrates, while a dual-mode encryption system is realized in gel matrices, opening up new avenues for information encryption as well as cumulative and interactive information protection. Furthermore, the redox reaction of CdS QDs is employed as ink for 3D printing, enabling for the creation of digitally programmable materials with distinct temporally evolving appearances by controlling the oxygen content in the ink to regulate the rate of photochromism. This advancement also sheds light on the progress in 3D printing technology.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Wei Wang,Yanyang Yin,Yizhuo Fan,Yu Chen,Shengping Ruan
Perovskite oxides are promising gas-sensing materials due to the stable chemical properties and suitable energy band structure. Quantum dots are low-dimensional nanomaterials with large specific surface areas and rich active sites, which are beneficial to sensing process. Here, the surface of porous CdSnO 3 nanocubes were sensitized with CdS quantum dots via a chemical bath deposition strategy and applied to isopropanol sensor. The novel CdS-modified CdSnO 3 porous cubes had a large specific surface area. In addition, DFT calculations show that the adsorption of isopropanol by CdS contributes to the recognition of isopropanol among alcohols by CdS/CdSnO 3 composite. Combined with the catalytic action of CdS on the oxidation of isopropanol and the formation of n-n heterojunction between CdSnO 3 and CdS, the sensor possessed enhanced performance in isopropanol detection. The response of the CdS/CdSnO 3 sensor was 20.12 to 100 ppm isopropanol, which was about three times higher than that of pure CdSnO 3 . And the sensor also possessed superior selectivity to isopropanol, fast response and recovery speed (5/22 s) and low optimum operating temperature (138 °C). This work has reference significance for the construction and understanding of isopropanol-sensing nanomaterials.
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Journal of Materials Chemistry A
·
2024
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IF 10.7
Zhen-Yu Wang,Lei Xu,Cai-Hua Liu,Sheng-Jie Han,Ming-Lai Fu,Baoling Yuan
Solar-driven interfacial water evaporation technology (SIET) is an emerging method for achieving sustainable production of clean water. Most available studies have focused on improving the evaporation efficiency of water, while less attention has been paid to the enrichment of evaporated organic contaminants, especially volatile organic compounds (VOCs) in distilled water, which is one of the key challenges in SIET. Herein, Ti3C2 MXene/CdS (MC) nanomaterials were synthesized by acid etching and hydrothermal methods, and MC composite hydrogels (MCHs) with synergistic effects of photothermal evaporation and photocatalysis were successfully prepared by crosslinking foaming polymerization. The water evaporation rate of optimal MCHs was 1.80 kg m−2 h−1 and the photothermal conversion efficiency of 82.80% could be achieved under one sun irradiation. Most importantly, MCHs significantly degraded a variety of organic contaminants in wastewater, among which the photodegradation rate of a typical VOC (phenol) was 85.12%, and the antibiotic metronidazole was completely removed. This research inferred that the MC hydrogels could be the promising synergistic photothermal evaporation and photocatalytic materials, providing a potential pathway for sustainable clean water production in the SIET field.
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Inorganic Chemistry Frontiers
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2025
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IF 6.4
Lu-Wen Qiu,Wen-Ni Zhang,Lin-Ying Wang,Hao Li,Tian-Kuan Zhang,Mi-Xin Lin,Su-Qin Ci,Jian Lü
In this work, morphological control with a series of sulfur-vacancy-rich CdS photocatalysts has been achieved toward the optimization of their performances in CO2 photoreduction. Results show that sulfur-vacancy-rich CdS nano-platelets (p-CdS-Vs) exhibit the highest CO2 photoreduction activity with a CO yield of 4058.5 μmol h−1 g−1, which is 10 and 6 times those of sulfur-vacancy-rich CdS nanowires (w-CdS-Vs, 372.8 μmol h−1 g−1) and nanorods (r-CdS-Vs, 638.7 μmol h−1 g−1), respectively, amongst the highest numbers for CdS-based photocatalysts reported hitherto. The superior CO2 photoreduction performance of p-CdS-Vs is attributable to its high efficiency of electron transport and suppressed recombination of photogenerated charge carriers. A mechanistic study indicates the critical role of surface sulfur vacancies that provide a microenvironment to trap unpaired electrons for the separation of photogenerated carriers so that the photocatalytic efficiency of CO2-to-CO reduction is largely improved in this current system.
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