JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yibin Song,Yanmei Guo,Shaopeng Qi,Ke Zhang,Jinfan Yang,Bingnan Li,Jinxi Chen,Yixin Zhao,Yongbing Lou
Heterojunction has been considered to be one of the most effective methods for efficient hydrogen evolution reaction by photocatalytic water splitting. In this work, nanostructured Cu 7 S 4 /MnIn 2 S 4 heterojunction was successfully fabricated via a simple two-step method, which was much simpler than most heterojunction synthesis. Firstly, Cu 7 S 4 nanoparticles were synthesized by oil bath stirring, and then the Cu 7 S 4 /MnIn 2 S 4 heterojunctions were synthesized by the hydrothermal method . The prepared Cu 7 S 4 /MnIn 2 S 4 composite exhibited significantly improved hydrogen evolution activity with a rate of 13.81 μmol h −1 (10 mg catalyst), which was approximately 18 times higher than that of pristine MnIn 2 S 4 . This result could be attributed to the construction of p-n heterojunction for promoting the separation of photogenerated charge carriers and inhibiting their recombination. Possible electron transfer mechanism was proposed by the related characterization. This work will inspire the simple fabrication of nano-heterojunctions in the future.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Rui Yang,Xiaozhong Zheng,Hao Fu,Xinyue Cao,Yangguang Hu,Yiyin Huang
Graphical Cu 7 S 4 /Cu nanoflowers with strong CO 2 adsorption and abundant boundaries were developed by a facile thermal reduction, which underwent in situ dynamic restructuring during ECR to generate highly active S-doped Cu 2 O/Cu hybrid catalyst. Thermodynamic and experimental analysis revealed that the optimized adsorption of the HCOO * intermediate on S−Cu 2 O/Cu was regulated and surface H was suppressed by S-doping. The high activity for CO 2 -to-HCOOH attributed to the strengthen CO 2 adsorption, abundant boundaries at Cu 2 O/Cu interfaces, and the regulation of adsorption energy by S-doping Optimized catalytic properties and reactant adsorption energy played a crucial role in promoting CO 2 electrocatalysis. Herein, Cu 7 S 4 /Cu underwent in situ dynamic restructuring to generate S−Cu 2 O/Cu hybrid catalyst for effective electrochemical CO 2 reduction to formate that outperformed Cu 2 O/Cu and Cu 7 S 4 . Thermodynamic and in situ Raman spectra revealed that the optimized adsorption of the HCOO* intermediate on S−Cu 2 O/Cu was regulated and the H 2 pathway (surface H) was suppressed by S-doping. Meanwhile, Cu 7 S 4 /Cu nanoflowers created abundant boundaries for ECR and strengthened the CO 2 adsorption by inducing Cu. These findings provide a new perspective on synthetic methods for various electrocatalytic reduction processes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Haijing Gao,Yajie Chen,Huali Li,Fangfang Zhang,Guohui Tian
Copper-based chalcogenides have been paid intensive attention as alternate photothermal catalysts for solar energy conversion. Despite considerable progress of copper sulfides nanostructure fabrication, combining independent copper sulfides polymorphs with various stoichiometries by forming heterojunction is still challenging. Herein, unique hierarchical nanosheet-assembled Cu 7 S 4 -Cu 9 S 8 heterostructure hollow cubes with remarkable photothermal aerobic oxidation activity were prepared by a facile onepot chemical transformation route using Cu 2 O cubes as sacrificial template for the first time. In this reaction system, the introduction of proper sulfur source thioacetamide and moderate alkaline conditions plays a crucial role in phase transformation, and through tunning the reaction time, a series of Cu 7 S 4 , Cu 7 S 4 -Cu 9 S 8 , and Cu 9 S 8 can be selectively prepared. Furthermore, the Cu 7 S 4 -Cu 9 S 8 polymorphic heterostructure hollow cubes exhibit significantly enhanced photothermal aerobic oxidation performance of amines to the corresponding imines compared with the individual Cu 7 S 4 and Cu 9 S 8 in both N , N -dimethylformamide and acetonitrile solvent medium. Our results indicated that the strong near-infrared plasmonic absorption of Cu 7 S 4 -Cu 9 S 8 facilitated hot carrier transport between Cu 7 S 4 and Cu 9 S 8 , which subsequently promoted the catalytic reactions. Especially after uniform load of Au-Pt alloy nanoparticles, the photothermal aerobic oxidation activity was further enhanced due to their boosted synergistic local coupling enhancement effect between distinct components in the N , N -dimethylformamide solvent medium. Such enhanced photothermal reaction could effectively promote sunlight utilization in a wide range of photocatalytic reactions.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Xiaoming Liu,Yinchu Zhang,Hongwei Wang,Jiajun Yan,Liushui Yan,Kexin Li,Huiqin Guo,Wang Gong,Jun Lin
In this work, a series of Zn x Cd 1-x S solid solutions are firstly prepared by a solvothermal process. The optimized composition of Zn x Cd 1-x S solid solution is determined to be Zn 0·2 Cd 0.8 S. On this basis, the Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst with a binary p-n heterojunction has been synthesized by a co-precipitation process followed by a solvothermal method . Owning to the synergistic effect of the heterojunction structure in the interface of Cu 7 S 4 (p-type) and Zn 0·2 Cd 0·8 S (n-type) and the built-in electric field in binary p-n heterojunction, the as-prepared Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst exhibits a significantly improved photocatalytic activity toward hydrogen production from water with visible light response, which is approximately 5.0 times and 16.5 times higher than of pristine Zn 0·2 Cd 0·8 S and CdS, respectively. The possible photocatalytic mechanism has been proposed basing on a series of experimental results. The current work might be valuable inspirations for designing highly efficient heterojunction composite photocatalyst for solar hydrogen evolution .
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2022
·Vol. 17
·期 20
·e202200645
·
IF 4.839
Yucui Huangfu,Zhipeng Xie,Tianxiang Wang,Jie Ding,Zhaoyang Chen,Yueming Zhai
Graphical Single Z-scheme Cu 7 S 4 /CdS Janus nanoparticle impact electrochemistry is performed, revealing that optimizing the Cu 7 S 4 /CdS ratio can decrease the accumulation of holes on valence band of CdS for inhibiting photo-corrosion and promote the accumulation of electrons on the conduction band of Cu 7 S 4 for boosting the electron reducibility. Direct Z-scheme Cu 7 S 4 /CdS Janus photocatalysts are successfully prepared by cation exchange method. Extensive studies containing single-nanoparticle impact electrochemistry are performed and reveal that optimizing the Cu 7 S 4 /CdS ratio can decrease the accumulation of holes on valence band of CdS for inhibiting photo-corrosion and promote the accumulation of electrons on the conduction band of Cu 7 S 4 for boosting the electron reducibility. With the optimized heterostructures, hydrogen evolution is remarkable promoted up to 21.62 mmol/g/h and quantum efficiency is up to 14.37% using polylactic acid plastic waste as feedstock.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xinxin Yuan,Zhiling Huang,Jinhua Li,Yue Meng,Zhenhai Gu,Bo Xie,Zheming Ni,Shengjie Xia
The steric effect caused by the lattice mismatch between the two phases hinders the separation and transfer of photogenerated carriers, which is one of the important factors limiting the activity of heterojunction photocatalysts. In this paper, semi - coherent interface Cu2O/Cu7S4 heterojunction was successfully constructed based on the epitaxy growth method of anion exchange. The degradation of tetracycline by semi - coherent interface Cu 2 O/Cu 7 S 4 -30 heterojunction under simulated visible light reached 95.3 % at 60 min, which is a significant improvement compared with single-phase catalysts and ordinary heterojunction catalysts (Cu 2 O/Cu 7 S 4 -mix). The experimental characterization and theoretical calculations confirmed the existence of unique S-Cu-O chemical bonds in the semi - coherent interface Cu 2 O/Cu 7 S 4 heterojunction. On the basis of heterojunction energy band bending and the formation of built-in electric fields, the S-Cu-O bonds can act as a specific bridge to further facilitate the separation, transfer and delivery of photoelectrons and holes, which contributes to the generation of more oxidatively active species (mainly superoxide radicals and holes). In addition, based on experimental characterization and theoretical calculations, the intermediates, degradation pathways and photodegradation mechanisms of the degradation process have also been discussed in detail.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2017
·
IF 13.942
Qun Li,Xianfu Wang,Kai Tang,Mengfan Wang,Chao Wang,Chenglin Yan
Cu-based electrocatalysts have seldom been studied for water oxidation because of their inferior activity and poor stability regardless of their low cost and environmentally benign nature. Therefore, exploring an efficient way to improve the activity of Cu-based electrocatalysts is very important for their practical application. Modifying electronic structure of the electrocatalytically active center of electrocatalysts by metal doping to favor the electron transfer between catalyst active sites and electrode is an important approach to optimize hydrogen and oxygen species adsorption energy, thus leading to the enhanced intrinsic electrocatalytic activity. Herein, Co-doped Cu7S4 nanodisks were synthesized and investigated as highly efficient electrocatalyst for oxygen evolution reaction (OER) due to the optimized electronic structure of the active center. Density-functional theory (DFT) calculations reveal that Co-engineered Cu7S4 could accelerate electron transfer between Co and Cu sites, thus decrease the energy barriers of intermediates and products during OER, which are crucial for enhanced catalytic properties. As expected, Co-engineered Cu7S4 nanodisks exhibit a low overpotential of 270 mV to achieve current density of 10 mA cm–2 as well as decreased Tafel slope and enhanced turnover frequencies as compared to bare Cu7S4. This discovery not only provides low-cost and efficient Cu-based electrocatalyst by Co doping, but also exhibits an in-depth insight into the mechanism of the enhanced OER properties.
研究领域:
材料科学
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电化学
·
理论计算
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ge Yang,Mengjie Lu,Jinyan Xiong,Gang Cheng
Photocatalytic CO 2 reduction into solar fuels has received increasing attention because it is a promising approach to tackle the environment and energy issues we are currently facing. Herein, the composite of K 2 Ti 8 O 17 nanowires assembly coupled with Cu 7 S 4 cocatalyst has been successfully prepared by an ion exchange method, in which the CuCl is employed as the copper source to convert CdS to Cu 7 S 4 . The photocatalytic performance of the integrated K 2 Ti 8 O 17 -Cu 7 S 4 composite is evaluated by CO 2 photoreduction, and it exhibits superior photoreduction capability than pristine K 2 Ti 8 O 17 nanowires assembly. In particular, the K 2 Ti 8 O 17 -Cu 7 S 4 -0.2 sample displays the highest CH 4 (6.02 μmol g −1 h −1 ) and CO (0.89 μmol g −1 h −1 ) yield within 4 h light irradiation, which is 3.83 and 12.71 times higher than that of K 2 Ti 8 O 17 sample, respectively. Based on the photo/electrochemical test results, the anchoring of Cu 7 S 4 cocatalyst can promote the photogenerated electron-hole pairs separation and charge transfer of the K 2 Ti 8 O 17 , which contributes to more photogenerated electrons participating in the process of photocatalytic CO 2 reduction to CH 4 . This work offers a promising approach to design efficient noble-cocatalyst-free photocatalyst for CO 2 photoreduction.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 6
·1472-1481
·
IF 3.117
Chun-Xiao Li,Ru-Ting Huang,Xian-Yang Shi
Cu7S4/reduced graphene oxide (rGO) photocatalysts are attracting increasing interest because of their low cost and environmental friendliness. In this study, Cu7S4/rGO nanocomposites with high visible-light photocatalytic activity were successfully synthesized via biological and chemical methods. The prepared Cu7S4/rGO nanocomposites exhibited exceptional photocatalytic activity for methyl green (MG) reduction. In particular, the nanocomposites photocatalyst with A-N (biosynthesis with Na2S as the sulfur source) provided the best photocatalytic performance, and could degrade 98.3% MG within 100 min. Their photocatalytic activity sequence is in the following order: A-N (98.3%) > A-U (biosynthesis with CuSO4 as the copper source) (97.8%) > A-C (biosynthesis with CH4N2S as the sulfur source) (97.7%) > A-180 (96.7%) (chemical synthesis at 180 °C in a steel autoclave) > Cu7S4 (69.8%). After five repeated tests, the photocatalyst used in this study showed excellent stability. The photocatalytic activity enhancement can be attributed to Cu7S4 combined with rGO, which can enhance the active center and increase electron transfer. This study provides a novel method for the preparation of a photocatalyst that can quickly and effectively solve dye pollution, and reduce other pollutants. Additionally, the photocatalyst is expected to be used in the fields of photocatalysis, water decomposition and solar cells.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 4
·1030-1039
·
IF 5.721
Quan Zhang,Juhua Zhang,Lu Zhang,Fengli Yang,Lingfeng Li,Wei-Lin Dai
At present, inefficient charge separation is considered to be one of the most important factors, limiting the photocatalytic hydrogen production. To solve this problem, herein, hierarchical Cu7S4/ZnIn2S4 decorated with black phosphorus quantum dots (BPQDs) was rationally designed and its photocatalytic hydrogen evolution was investigated under visible light. The structural characterization proved the wrapped morphology of ZnIn2S4 grown on the Cu7S4 nanocrystals and BPQDs were uniformly dispersed on the surface of ZnIn2S4. Moreover, the close hierarchical structure of Cu7S4 with ZnIn2S4 and carrier separation facilitator of BPQDs were synergistically beneficial for boosting charge separation and transfer. The hydrogen production results showed that the ternary BPQDs@10% Cu7S4/ZnIn2S4 yielded the highest H2 evolution rate of 885 μmol g−1 h−1, about 6.8 times higher than that of the pristine ZnIn2S4, indicating its promising application in hydrogen production. In addition, the possible working mechanism was deeply explored using photo-electrochemistry, and the results illustrated that the enhanced photocatalytic hydrogen evolution can be attributed to the efficient charge separation caused by the formation of the hierarchical interface structure and increased carrier transfer efficiency of BPQDs. This study demonstrates that the regulation of interfacial charge transfer can positively facilitate photocatalytic activity and the ternary BPQDs@10% Cu7S4/ZnIn2S4 can be employed as an efficient candidate for hydrogen production.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 26
·5707-5721
·
IF 5.344
Mingdi Sun,Dan Yang,Wu Fanqi,Zhao Wang,Hongjiao Ji,Zhiliang Liu,Shili Gai,Fangmei Zhang,Piaoping Yang
Photodynamic therapy (PDT) is a light-based modality for tumor treatment that involves the generation of reactive oxygen species (ROS) by the combination of light, a photosensitizer, and molecular oxygen. Nevertheless, the therapeutic effects of PDT are limited by hypoxic conditions that worsen with oxygen consumption during the PDT process. Photo/chemodynamic therapy (PCDT) based on the Fenton reaction is one strategy to improve ROS generation, provided a highly effective Fenton reagent is developed. In this research, SiO2@Cu7S4 nanotubes (NTs) were synthesized as a PCDT agent. This double-valence metal-sulfide composite material can react with H2O2 at the tumor site. SiO2@Cu7S4 NTs can produce more ROS than the traditional PDT agents, and besides, they can also be used as a photothermal therapy (PTT) agent. SiO2@Cu7S4 NTs will trigger the PTT effect under 808 nm irradiation and generate a large amount of heat to eradicate cancer cells. This heat will also promote the PCDT effect by increasing the reaction rate. Thus, the SiO2@Cu7S4 NT is a suitable material for PCDT and PTT synergistic oncotherapy. The 808 nm laser is selected as the appropriate excitation source, providing adequate penetration and minimal harm to normal cells. The experimental data presented herein demonstrate the promising photosensitive, Fenton-like, and photothermal performance of SiO2@Cu7S4 NTs. Furthermore, the findings could promote the development of PCDT and PTT synergistic therapy. Thus, this research provides a feasible method to design a single, multifunctional material for cancer treatment.
研究领域:
肿瘤学
·
材料科学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xueqian Wu,Zhen Li,Jiangyan Tao,Jin Zhao,Yufei Xie,Songjian Zhao
The discharge of colorless and water-soluble formaldehyde (FA) wastewater poses a serious threat to human health. In this study, copper based Fenton-like catalyst Cu x S y was innovatively introduced into the FA degradation system. Cu x S y catalysts with different morphologies were regulated by ethylenediamine . The Cu 7 S 4 catalyst exhibited 99% degradation performance towards FA. The physical and chemical properties of catalysts indicate that the Cu 7 S 4 catalyst has a beautiful dendritic snowflake like structure, which is more conducive to the adsorption and degradation process of FA. Electron paramagnetic resonance (EPR) detected an obvious Cu defect (g=2.064) in Cu 7 S 4 , which can effectively activate H 2 O 2 and stimulate the generation of •OH, thus accelerating the degradation of FA. Compared with Fenton reagent, Cu 7 S 4 shows more than 75% FA degradation performance (pH=5 and pH=9). Further research showed that the H 2 O 2 :Cu 7 S 4 ratio of 2:10 showed a 95% degradation effect on FA at 200–1000 ppm, demonstrating a more efficient and stable FA degradation ability. Moreover, the mechanism of FA degradation was analyzed.
研究领域:
环境科学
·
催化
·
水处理
·
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）