JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Jun Jiang,Zhidong Chen,Peng Wang,Pei-Yang Gu,Jiadi Liu,Zhuzhu Zhang,Qingfeng Xu
At present, hexavalent chromium (Cr(VI)) has a serious impact on the water environment and human beings since it can be easily absorbed by the human body, lethal to aquatic organisms and carcinogenic to humans. Based on this, a black hollow TiO 2 nanotube supported polydopamine (PDA)@Ag 2 S composite photocatalytic material was prepared, which can be used for the efficient photocatalytic reduction of Cr(VI) in wastewater. Both black hollow TiO 2 and Ag 2 S have the shortcoming of undergoing ready recombination of photogenerated carriers. The introduction of PDA can not only improve the photogeneration of composite photocatalytic materials, but also broaden the absorption range in the visible-light region. A detailed mechanism for the TiO 2-x @PDA@Ag 2 S photocatalytic system has been proposed at the same time. This work provides a new methodology for the design and synthesis of sandwich organic-inorganic hybrid photocatalytic materials.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lanwei Li,Chengxiao Peng,Jing Chen,Zheng Ma,Yanqun Chen,Shuyao Li,Jianli Wang,Chao Wang
Phase transition will lead to abrupt change of thermoelectric material’s properties, which will have a negative influence on the application of thermoelectric device. Therefore, avoiding the phase transition of Ag 2 S is particularly important for its heat collection applications. In this work, we reported, for the first time, that Cu-Se co-alloying in Ag 2 S can suppress phase transition and improve thermoelectric properties. Specifically, different elements and compounds alloying in Ag 2 S samples were prepared, and their influences on the phase change behavior and thermoelectric performance stability of Ag 2 S are systematically studied. It is found that the free enthalpy decreases and the heat absorption peak disappears for the Cu-Se co-alloyed Ag 2 S sample. In addition, the average lattice thermal conductivity is greatly reduced, and the κ L of Ag 1.8 Cu 0.2 S 0.5 Se 0.5 is around 0.27 W m −1 K −1 from 330 K to 450 K. Therefore, a high ZT is obtained for Cu-Se co-alloyed Ag 2 S.
研究领域:
材料科学
·
凝聚态物理
·
热电材料
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Yejun Zhang,Yongsheng Liu,Chunyan Li,Xueyuan Chen,Qiangbin Wang
Ag2S quantum dots (QDs) have attracted increasing attention due to their appealing optical properties in the near-infrared regime. However, a full understanding of the quantum confinement effect of Ag2S QDs has not been achieved so far. Herein, for the first time, the size-dependent excited state optical properties of Ag2S QDs are systematically investigated by photoluminescence (PL), PL excitation (PLE), and time-resolved PL spectroscopy. Experimentally, we determine the exciton Bohr radius of Ag2S QDs as 2.2 nm, which is highly consistent with theoretical results.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Qingtao Wang,Liqiu Huang,Huiping Liu,Yanxia Wu,Guofu Ma,Ziqiang Lei,Shufang Ren
As a sustainable and green technology for producing high-purity hydrogen, hydrogen evolution reaction (HER) has received extensive attention. The development of an electrocatalyst with good HER activity is the key to economic water electrolysis. Here, this work reports a defect-mediated successive ion layer adsorption and reaction method to construct Ag 2 S/irradiated Sb 2 Te 3 heterojunctions with good HER activity. First, ion irradiation is used to introduce a large number of defects into Sb 2 Te 3 . The defective Sb 2 Te 3 is continuously cyclically immersed in AgNO 3 solution and Na 2 S solution. Ag + and S 2- ions are adsorbed on the defect sites of Sb 2 Te 3 and deposited as Ag 2 S and the heterojunction of Ag 2 S/irradiated Sb 2 Te 3 is obtained. By this strategy, the electrochemical active surface area of the material is increased, reduces the charge transfer resistance, and improves the hydrophilicity of the material surface, thus exhibiting good HER activity. In this work, ion irradiation is used to regulate the surface defects of materials and then to regulate the growth of heterojunction to achieve the purpose of regulating the properties of material. The heterojunction growth method controlled by defect engineering can be widely used in the preparation of heterojunction materials in other energy and environmental fields.
研究领域:
材料科学
·
电催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 43
·26908-26914
·
IF 3.361
Jingyuan Liu,Xinyi Xue,Xin Zhou,Gang Chen,Wei Liu
3 wt% Ag2S/Zn5In2S8 (3A/Z5) and 3 wt% Ag2S/ZnIn2S4 (3A/Z1) were prepared by a two-step synthesis method. The first-principles calculations revealed that the anisotropic carrier transport property of Zn5In2S8 (Z5) is much stronger than that of ZnIn2S4 (Z1). Furthermore, unsynchronized electron and hole transport leads to higher bulk carrier separation efficiency in Z5. After accelerating the surface photocatalytic reaction rate by Ag2S modification, the differences between 3A/Z5 and 3A/Z1 in the bulk carrier separation were further enlarged. Photoelectrochemical tests confirmed that the bulk charge separation efficiency of 3A/Z5 is 13.70%, which is 7.4 times higher than 3A/Z1 (1.84%). Because of the high bulk carrier separation efficiency, the 3A/Z5 exhibits a promising photocatalytic hydrogen production rate, reaching 3189 μmol h−1 g−1. Through intuitive evidence, this work proves that material with stronger anisotropic conductivity has higher bulk carrier separation efficiency, thus has the potential to exhibit high photocatalytic hydrogen production performance.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qi Si Chen,Peng Lei Cui,Jun Yang,Dong Chen,Hui Liu,Huiyan Feng,Panagiotis Tsiakaras,Pei Kang Shen
Electrochemical carbon dioxide reduction reaction (CO 2 RR) is regarded as an effective strategy to store abundant renewable energy and build a carbon neutral society. Gold (Au) and silver (Ag)-based catalysts for the effective electrochemical transformation of CO 2 to CO emerge as promising candidates. Heterogeneous nanocomposites composed of noble metals and semiconductors exhibit great potential for electrocatalytic CO 2 reduction through the electronic coupling effect at coherent interfaces. Herein, we successfully synthesize heterogeneous Ag 2 S-Au composite nanoparticles (NPs) as effective catalysts for CO production through CO 2 RR. At −0.8 V vs RHE, the heterogeneous Ag 2 S-Au nanocatalysts display a considerable CO Faradaic efficiency of 94.5%, and an appreciable CO partial current density of 9.17 mA cm −2 . Moreover, they exhibit good stability for 30 h without obvious decrease. On the basis of density functional theory (DFT) calculations, it can be made clear that the heterogeneous Ag 2 S-Au interface is energetically more beneficial to the generation of COOH* intermediate for CO 2 RR. This study provides a new application for noble metal–semiconductor nanocomposites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2025
·
IF 2.4
Yusong Pan,Shuhuan He,Linjie Ou,Shihui Zang,Run Huang
Photocatalytic technology is one of the most promising technologies for wastewater treatment. In this paper, Ag 2 S/Ag 2 CrO 4 core–shell heterojunction were prepared using in-situ anion exchange method. The structure, morphology, and optical properties of the prepared samples were characterized by XRD, SEM, TEM, XPS, and DRS technologies. The photo-degradation results verified that the 2 %-Ag 2 S/Ag 2 CrO 4 heterojunction exhibited excellent photocatalytic activity for degradation of organic dyes and antibiotics under visible light irradiation. The removal efficiency for RhB was 95 % in 15 min, which was obviously superior to that of pure Ag 2 CrO 4 (∼73 %) and Ag 2 S (∼7%) photocatalysts. The enhanced photocatalytic performance of the Ag 2 S/Ag 2 CrO 4 was mainly attributed to the Z-scheme core–shell heterojunction structure of the photocatalyst that facilitated excellent charge carriers separation and migration. Meanwhile, the results of trapping experiments for active species demonstrated that both the holes (h + ) and superoxide radical ( O 2 − ) played an important role for degradation of organic pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2012
·
IF 11.421
Yan Zhang,Guosong Hong,Yejun Zhang,Guangcun Chen,Feng Li,Hongjie Dai,Qiangbin Wang
Ag2S quantum dots (QDs) emitting in the second near-infrared region (NIR-II, 1.0–1.4 μm) are demonstrated as a promising fluorescent probe with both bright photoluminescence and high biocompatibility for the first time. Highly selective in vitro targeting and imaging of different cell lines are achieved using biocompatible NIR-II Ag2S QDs with different targeting ligands. The cytotoxicity study illustrates the Ag2S QDs with negligible effects in altering cell proliferation, triggering apoptosis and necrosis, generating reactive oxygen species, and causing DNA damage. Our results have opened up the possibilities of using these biocompatible Ag2S QDs for in vivo anatomical imaging and early stage tumor diagnosis with deep tissue penetration, high sensitivity, and elevated spatial and temporal resolution owing to their high emission efficiency in the unique NIR-II imaging window.
研究领域:
生物医学工程
·
纳米医学
·
光学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yong Zuo,Jinjun Chen,Haocheng Yang,Miao Zhang,Yanfen Wang,Gang He,Zhaoqi Sun
In this paper, highly ordered titanium dioxide nanorod (TNR) arrays decorated with Ag-Ag 2 S quantum-dots (QDs) were synthesized on FTO substrate through hydrothermal treatment and in-situ vulcanization . The content of Ag 2 S QDs on Ag/TNR was controlled by changing the immersion time of Ag/TNR in the N-N-dimethyl formamide (DMF) solution containing dissolved sulfur element. The morphology, structure, composition and optical, photoelectric and photocatalytic properties of QDs/TNR arrays were studied in detail. In the visible range, the QDs/TNR array with a soaking time of 12 h exhibits the maximal photocurrent density (0.082 mA/cm 2 ) and photodegradation rate (62.2%), which is 5.5 and 1.85 times higher than that of pure TNR. The improvement of these properties could be attributed to synergy effect between Ag and Ag 2 S materials. That is, Ag QDs can stably capture and transmit photo-generated electrons from the TNR surface, whereas the Ag 2 S promoter is regarded as the interface active sites to enhance photocatalytic reactions. Therefore, the synergistic effect of Ag-Ag 2 S can significantly enhance the photoelectrochemical and photocatalytic properties of the TNR arrays.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yanyan Chen,Minghui Yu,Xiaoyu Gong,Yingjie Wang,Shenjie Li,Qi Hu,Shuang Wang,Hao Yu,Zhiqiang Li
Two kinds of Ag 2 S-Zn 0.5 Cd 0.5 S heterostructural photocatalysts were synthesized via a simple two-step hydrothermal method. The photochemical (PEC) properties of Zn 0.5 Cd 0.5 S nanoparticles modified by Ag 2 S are closely related to the reaction time of Zn 0.5 Cd 0.5 S nanoparticles. Compared with the Ag 2 S-Zn 0.5 Cd 0.5 S heterostructure prepared at low temperature, the Ag 2 S-Ag-Zn-Cd-S composite prepared at high temperature has higher charge transfer/separation efficiency and longer carrier life. The photocatalytic performance of Ag 2 S-Ag-Zn-Cd-S composites for the degradation of Rhodamine B (RhB) under visible light irradiation (λ = 420 nm) was significantly improved. The AZCS-180-4 h photocatalyst exhibited the highest degradation efficiency (83.1% within 40 min) with a rate constant of 0.0401 min −1 which exhibited prominent stability and repeatability, and can still maintain high photocatalytic activity after at least four cycles. Meanwhile, the study of photocatalytic mechanism shows that the photo-induced h + radical is the predominant active species in this photocatalytic system, followed by·OH and·O 2- play a secondary role.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2013
·Vol. 8
·期 1
·1-7
·
IF 2.524
Hu Hongwei,Ding Jianning,Zhang Shuai,Li Yan,Bai Li,Yuan Ningyi
Ag 2 S quantum dots were deposited on the surface of TiO 2 nanorod arrays by a two-step photodeposition. The prepared TiO 2 nanorod arrays as well as the Ag 2 S deposited electrodes were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscope, suggesting a large coverage of Ag 2 S quantum dots on the ordered TiO 2 nanorod arrays. UV–vis absorption spectra of Ag 2 S deposited electrodes show a broad absorption range of the visible light. The quantum dot-sensitized solar cells (QDSSCs) based on these electrodes were fabricated, and the photoelectrochemical properties were examined. A high photocurrent density of 10.25 mA/cm 2 with a conversion efficiency of 0.98% at AM 1.5 solar light of 100 mW/cm 2 was obtained with an optimal photodeposition time. The performance of the QDSSC at different incident light intensities was also investigated. The results display a better performance at a lower incident light level with a conversion efficiency of 1.25% at 47 mW/cm 2 .
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Zhongwei Fan,Jingfei Luan,Changqing Zhu,Fuqiang Liu
The novel Z-scheme heterojunction photocatalyst g-C 3 N 4 /Ag 2 S/SnS 2 with Ag 2 S quantum dots as electron mediators was successfully synthesized by in-situ ion exchange reaction and self-peeling of g-C 3 N 4 . Compared with g-C 3 N 4 , SnS 2 or g-C 3 N 4 /SnS 2 , the photocatalyst g-C 3 N 4 /Ag 2 S/SnS 2 exhibited more excellent photocatalytic performance under visible light irradiation. The removal rate of methyl orange was 96.8% after 30 minutes visible light irradiation and the reaction rate constant reached 0.10225 min -1 . The enhanced photocatalytic activity could be attributed to the formation of Z-scheme heterojunction structure and the 2D layered structure. The electrochemical and photoelectric performance tests showed that the separation and transfer efficiency of the photogenic electron-hole pairs as well as the redox potential were significantly improved. Additionally, the quenching experiments showed that the superoxide radicals and holes were the primarily active species. Combined with other characterizations, the reaction mechanism of the g-C 3 N 4 /Ag 2 S/SnS 2 for degrading the target pollutant methyl orange under visible light irradiation was proposed.
研究领域:
材料科学
·
环境科学
✓ 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）