CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wang-Wei Liao,Lei Yang,Jie Chen,Da-Li Zhou,Xian-lin Qu,Kun Zheng,Guang Han,Jia-Bei Zhou,Min Hong,Zhi-Gang Chen
Copper selenide (Cu 2 Se) has been extensively studied as an eco-friendly thermoelectric candidate owing to the outstanding thermoelectric performance of its high-temperature β-phase. In this study, we propose that α-Cu 2 Se is also a promising thermoelectric material at near-room-temperature. We synthesize nanostructured Cu 2-x Se via a facile solvothermal method, and densify the samples using Spark Plasma Sintering to maintain the small grain sizes. Although the as-prepared α-Cu 2 Se has intrinsically low lattice thermal conductivity , its high Cu deficiency leads to a high carrier concentration, therefore, a low thermoelectric performance. As an electron donor, bismuth can effectively compress the Cu vacancies of the as-prepared α-Cu 2 Se and in turn reduce its carrier concentration from 4.1 × 10 20 to 2.0 × 10 20 cm −3 at room temperature, achieving a significantly enhanced power factor and a reduced carrier thermal conductivity. Consequently, a zT of 0.43 at 373 K is obtained in Cu 1.982 Bi 0.006 Se, showing great potential in developing high-performance near-room-temperature α-Cu 2 Se-based thermoelectric materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Materials Today Sustainability
·
2021
·
IF 4.524
Q. Shu,W. Qiu,M. Luo,L. Xiao
The development of low-cost and highly efficient adsorbents is of great significance in the treatment of dye wastewater. In this work, a facile one-pot hydrothermal method is developed for the synthesis of copper selenides (CuSe) using orange juice as the reducing and coating reagent. The morphology of CuSe can be regulated by simply optimizing the amount of orange juice. Three different microscopic morphologies of CuSe are obtained, which include dendritic CuSe, flower-like CuSe, and spherical CuSe. Because of the porousness, abundant side-branch structure, and strong electrostatic adsorption, dendritic CuSe can be used to efficiently adsorb cationic rhodamine 6G (R6G) dye. Freundlich model is found to be suitable for R6G adsorption isotherm . These results demonstrate that the dendritic CuSe prepared using natural juice as raw material can be potentially applied to remove organic dyes pollutants in wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Wei Zheng,Zequn Yang,Jiefeng Chen,Weizhen He,Ruiyang Qin,Hongxiao Zu,Wenqi Qu,Jianping Yang,Lijian Leng,Hailong Li
A fundamental obstacle that restricts the use of metal selenides for gaseous elemental mercury (Hg 0 ) immobilization is the failure to take both the optimization of intrinsic structure favorable for Hg 0 diffusion and adequate exposure of metal selenide towards Hg 0 into consideration. In this work, a Ti 3 C 2 MXene/Cu 2 Se sorbent for Hg 0 sequestration was synthesized via a Lewis acid etching route combined with room-temperature selenization pathway. During this strategy, copper chloride plays a dual role, i.e., an etching agent for the Ti 3 C 2 MXene synthesis and a precursor for Cu 0 decoration. Cu 2 Se precursors (Cu 0 ) were dispersedly and firmly pre-anchored on the substrate, effectively avoiding the agglomeration and warranting excellent dispersion of Cu 2 Se. Compared with pristine Cu 2 Se, Ti 3 C 2 MXene/Cu 2 Se exhibits advantageous structural characteristics fully boosting Hg 0 diffusion kinetics. Meanwhile, the enhanced dispersion of Cu 2 Se from the prefixation of Cu 0 largely enhances the exposure and utilization of selenide. Consequently, Ti 3 C 2 MXene/Cu 2 Se shows a Hg 0 adsorption capacity of 147.64 mg g −1 , which is much higher than those of Cu 2 Se and most other metal selenides. Impressively, its uptake rate of 688.99 μg g −1 min −1 is the highest record rate in metal selenides. Moreover, Ti 3 C 2 MXene/Cu 2 Se still maintained outstanding Hg 0 adsorption performance under relatively high reaction temperature with the shelter of Ti 3 C 2 MXene. Typical fuel gas situations including coal combustion flue gas, smelting flue gas, natural gas have negligible influences on its Hg 0 adsorption performance, indicating its extensive applicability and flexibility for actual industrial situations. This work also provides valuable hints for the trade-off of structural properties and ligands exposure to design Hg 0 sorbents with satisfactory Hg 0 sequestration performances.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2020
·
IF 0
Yuhuan Zhao,Xianwen Wang,Feng Gao,Chenya Wang,Zongjin Yang,Hanfei Wu,Chunyan Li,Liang Cheng,Rui Peng
The spread of antibiotic-resistance poses a great threat, making it a growing need to develop other antibacterial strategies and therapeutics. Recently, owing to their excellent physicochemical properties, copper chalcogenides have received extensive attention as photothermal agents. However, most reports are focused on Cu2–xS nanoparticles, whereas very few water-dispersible Cu2–xSe nanomaterials have been reported due to their difficult preparation process. Herein, water-dispersible and biocompatible cuprous selenide nanosheets (Cu2Se NSs) were synthesized by a simple anion exchange method starting from cuprous oxide nanorods (Cu2O NRs), which could also help avoid any environmental pollution caused by the organic solvent used during synthesis. The obtained Cu2Se NSs showed strong absorption in the second near-infrared window (NIR II) with a good photothermal conversion efficiency as high as ∼61.16%, outstanding among the previously reported NIR II photothermal agents. Interestingly, using Staphylococcus aureus and Escherichia coli as model pathogens, these Cu2Se NSs possess an intrinsic bacteriostatic effect and could inhibit the growth of both bacteria species. Furthermore, both the fluorescent-based microscopy and the bacterial morphology analysis using a scanning electron microscope have demonstrated that incubation of both species of bacteria with Cu2Se NSs under laser irradiation (1064 nm) would lead to complete disruption of the bacterial cell wall. Our work presents a facile method to prepare water-dispersible Cu2Se NSs-, which could serve as highly efficient dual-functional antibacterial agents.
研究领域:
材料科学
·
生物医学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Chong-Yu Wang,Tian-Yu Yang,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
The features of the phonon-liquid electron crystal (PLEC) are the keys to realizing excellent electrical and thermal transport properties of Cu2Se-based materials. Nevertheless, it is difficult to obtain the high-temperature cubic Cu2Se at room temperature, which inhibits the thermoelectric performance in a wide temperature range. Herein, a strategy of turning phase structure and thermoelectric performance in copper selenide was proposed by utilizing hydroiodic acid (HI) as a dopant in the hydrothermal reaction process. Iodine doping is effective in controlling the phase transition of copper selenide, causing the existence of a cubic phase in the copper selenide at room temperature. The electrical conductivity of I-doped Cu2Se is significantly increased owing to the variation of phase structure and carrier concentration. The power factor is therefore highly enhanced to 1925 μW m–1 K–2 for the Cu2Se-1 mL HI sample at 773 K. Ultimately, the average thermoelectric performance of the I-doped Cu2Se is improved in the whole temperature range. This study provides a novel path to controllably regulate the phase structure and thermoelectric properties of copper selenide, which might be worth promoting in other systems.
研究领域:
材料科学
·
热电材料研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-8
·
IF 2.8
Xue Lisha,Wang Yuan,Zhu Shuangmei,Mao Qianhui,Jia Xiaopeng,Zhang Yuewen
We have synthesized the quaternary copper selenide Bi x Cu 2−3 x Se 0.95 Te 0.05 compounds by high-pressure followed with ball milling method and investigated their thermoelectric properties. The crystal structure and element doping are characterized and verified by the X-ray diffraction, high-resolution transmission electron microscope and X-ray photoelectron spectroscopy. Compared with other samples, the samples with x = 0.001 and 0.002 have larger layered grain size and smaller grain boundary. This may lead to the reduction of resistivity in a wide temperature range, thus realizing the optimization of electronic characteristics. The dislocation-induced lattice strain fluctuations may cause the abrupt thermal conductivity, which is contrary to the previous results. Eventually, a peak value of zT = 1.03 at 873 K is obtained for Bi 0.001 Cu 1.997 Se 0.95 Te 0.05 and Bi 0.002 Cu 1.994 Se 0.95 Te 0.05 .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Lin Zhang,Yang Zheng,Guoliang Li,Jiajia Gao,Yali Tong,Tao Yue
With the rapid development of adsorbents for removal of elemental mercury (Hg 0 ) from coal combustion flue gas, the preparation of adsorbents with superior performance, lower cost and environmental friendliness remains an important challenge. An incipient wetness impregnation method followed by in-situ selenization was used to load copper selenide (CuSe) onto the surface of optimal magnetic biochar (OMBC). The results showed that CuSe significantly enhanced the Hg 0 removal performance of the OMBC, and CuSe loading ratio of 10 % (10CuSe/OMBC) had the best Hg 0 removal performance. 10CuSe/OMBC maintained its Hg 0 removal efficiency above 95 % for 150 min at 30∼150 °C, and it had a good resistance to SO 2 . The equilibrium adsorption capacity of 10CuSe/OMBC could reach up to 8.73 mg/g, which was close to the theoretical value 12.99 mg/g, and the adsorption rate was up to 20.33 µg/(g·min) Meanwhile, 10CuSe/OMBC had strong magnetism that is not permanently magnetized, which could be separated from desulfurization gypsum and recycled many times. Characterization results demonstrated that Se 2 2- , Cu 2+ and O β played essential roles in the oxidation of Hg 0 , and Se 2 2- and Se 2- can immobilize Hg 2+ to HgSe. 10CuSe/OMBC has important guiding significance for practical application because of its low cost, high performance and low mercury leaching characteristic to form HgSe.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Siping Li,Gangyong Li,Zhi Li,Wenyuan Xu,Liang Chen,Wei Wang,Binhong He,Minjie Zhou,Zhaohui Hou
Transition metal selenides (TMSs) become one of the most promising cathode materials for rechargeable aluminum batteries (RABs) due to the advantages of high specific capacity, low cost, and simple preparation process. However, TMSs are soluble in the acidic chloroaluminate ionic liquid electrolyte during cycling, leading to undesirable electrochemical performance. Herein, rechargeable Al-Cu 2 Se batteries are fabricated with acetylene black modified separator (AB/GF/A) showing excellent electrochemical performance with capacity retention of 95 mAh g −1 after 5000 cycles at 0.5 A g −1 and 166.1 mAh g −1 at 1.0 A g −1 . By combining electrochemical tests and ex situ spectroscopy and electronic microscope characterizations, it is revealed that the dissolved Cu and Se species adsorbed on the surface of AB/GF/A still remain electroactivity, which transforms the diffusion-controlled mechanism of Cu 2 Se to surface pseudocapacitance-controlled behavior, thus suppressing the shuttle effects and boosting the reaction kinetics. The in-depth understanding of the functionalized separator in energy storage mechanism of TMSs could provide reference for further progress of RABs in the future work.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Fangfang Kong,Jiang Bai,Peng Bi,Xiaowei Liu,Ziyu Wang,Rui Xiong
As a promising thermoelectric material, copper selenides have attracted the interest of researchers owing to their low cost, abundance in earth, environmental friendliness, and low thermal conductivity . In this study, copper selenide (Cu 2-x Se) powders with controllable sizes from nanoscale to mesoscale were obtained by a facile one-pot solvothermal method. After treatment with spark plasma sintering , the nanoscale Cu 2-x Se pellets exhibited excellent thermoelectric properties such as sharply reduced thermal conductivity and enhanced Seebeck coefficient as well as a suppressed electrical conductivity . The figure of merit ( ZT ) of the nanoscale Cu 2-x Se reached up to ∼1.51 at 873 K, which is about 2.67 times higher than that of the meso-Cu 2-x Se. This study confirms that thermoelectric properties can be enhanced by the size effect.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Materials Today Sustainability
·
2022
·
IF 7.244
Q. Shu,W. Qiu,M. Luo,L. Xiao
Hybrid photocatalysts have important prospects in clean energy and sewage treatment . Herein, we construct functional hybrid materials consisting of nonstoichiometric copper selenides (Cu 2-x Se) and porous gadolinium micro-networks (P-MNs) formed by the hydrothermal treatment of gadolinium (III) nitrate and citric acid (Cu 2-x Se/P-MNs) as the excellent photocatalyst for the photodegradation of fluorescent dyes. Cu 2-x Se/P-MNs photocatalysts show good chemical stability because the hybridization of Cu 2-x Se and P-MNs is based on an in-situ growth strategy. More importantly, due to the strong light-harvesting and good electron transfer ability, Cu 2-x Se/P-MNs show superior photocatalytic activity with a catalytic rate of up to 0.33 min −1 only under the irradiation of 20 W of low-power white light, which is at least two orders of magnitude higher than other common photocatalysts. Detailed studies show that the h + , O 2 •−, and ⋅OH are the main active species in the photocatalytic process. According to the ‘three channel’ catalytic path, rhodamine 6G as the model dye can be completely and rapidly degraded within 15 min. Because of the good photocatalytic activity, Cu 2-x Se/P-MNs show great application prospects.
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
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 1
·1-15
·
IF 23.2
Wang Jing-Qi,Zheng Qi,Cao Wen-Qiang,Zhai Hua-Zhang,Cao Mao-Sheng
The highly advanced electronic information technology has brought many conveniences to the public, but the existence of electromagnetic (EM) pollution and energy scarcity are also becoming too difficult to ignore. The development of efficient and multifunctional EM materials is an inevitable demand. In this paper, hollow copper selenide microsphere-graphene oxide nanosheet (CG) composites are fabricated by using a simple template method. The heterodimensional structure constructed by three-dimensional microspheres and two-dimensional nanosheets endows the material with an integrated attenuation effect and abundant dielectric genes. By adjusting the content of GO, the microstructure of CG is precisely tailored, and its EM response is accurately regulated. The minimum reflection loss (RL) is up to − 61.77 dB (CG40), and the effective absorption bandwidth is 4.24 GHz (CG30). Meanwhile, effective electromagnetic interference (EMI) shielding performance is achieved (35.4 dB). In addition, excellent electrochemical performance is achieved. Based on the excellent EM property and electrochemical performance, a thermoelectric pile array is designed to convert and effectively store microwave energy. This work provides new inspiration for the design of EM functional materials and devices to solve EM pollution problems. Graphical
研究领域:
材料科学
·
能源科学
·
电子工程
✓ 已验证
DOI
高影响因子
SmartMat
·
2023
·Vol. 4
·期 3
·e1193
·
IF 20.4
Feifan Chen,Yadong Zhang,Lijun Hu,Lifang Zheng,Feiyue Ge,Changsheng Feng,Dan Xu,Chen-Lei Tao,Xue-Jun Wu
The crystal phases are essential to the physicochemical properties and functionalities of materials. Copper selenide has emerged as an important and appealing semiconductor, which can exist in a variety of polymorphic phases. However, the richness of polymorphs also makes it a challenge to the direct preparation of copper selenide nanocrystals with tunable phases. Herein, two polymorphs, that is, quasi-tetragonal Cu 2− x Se nanocubes and metastable wurtzite Cu 2 Se nanodisks, are successfully synthesized by using a single precursor, copper(I) selenocyanate (CuSeCN), as the Cu and Se sources. The key to phase modulation is the optimal choice of the ligand in the synthesis. The as-prepared nanocrystals possess different morphologies and compositions, giving rise to distinct optical properties and electrical conductivities. Interestingly, the copper selenide nanocrystals can provide a platform for the rational construction of two types of amorphous hollow Au─Cu─Se nanostructures by reaction with Au(I) precursor, in which their final shapes are well kept as that of the original nanocrystal templates. This work provides an easy strategy for the phase-controlled synthesis of copper selenide nanocrystals and enables the design of new materials for broad applications.
研究领域:
材料科学
·
纳米技术
·
化学合成
✓ 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）