Battery Energy
·
2024
·
IF 9
Xiangchao Xu,Fen Qiao,Yanzhen Liu,Wenjie Liu
Cu(OH) 2 has the advantages of ease of structural regulation, good conductivity, and relatively low cost, making it a suitable candidate material for use as an electrocatalyst. However, its catalytic efficiency and stability still need to be improved further. Therefore, Cu(OH) 2 /Cu 2 S was successfully prepared on copper foam (CF) using the in situ growth and hydrothermal method. The structural characterization showed that sulfidation treatment induced transformation of Cu(OH) 2 /CF from smooth nanorods into a coral-like structure, which exposed more active sites of Cu(OH) 2 /Cu 2 S and enhanced the performance of electrocatalytic hydrogen evolution reaction (HER). Compared with Cu(OH) 2 , Cu(OH) 2 /Cu 2 S showed better alkaline HER performance, especially when the vulcanization concentration was 0.1 M, the overpotential of Cu(OH) 2 /Cu 2 S was 174 mV, and the reaction kinetics was 64 mv dec −1 at a current density of 10 mA cm −2 . In this work, the morphology and electronic structure of copper-based metal sulfide electrocatalysts were adjusted by sulfide treatment, which provided a new reference for improving HER performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qian Liu,Wenqian Luan,Xingrong Zhang,Ruiyang Zhao,Jishu Han,Lei Wang
The design of a low-cost, efficient and durable co-catalyst for hydrogen evolution is of great significance for improving photocatalytic activity. In this work, a NiMoP 2 /Cu-ZnS composite photocatalyst was prepared by in-situ growth of NiMoP 2 on the surface of copper-doped zinc sulfide (Cu-ZnS). The test results showed that the hydrogen production rate of the optimized NiMoP 2 /Cu-ZnS under visible light irradiation was significantly improved. Among them, NiMoP 2 /Cu-ZnS-1 exhibited the highest photocatalytic activity (5.13 mmol·g −1 ·h −1 ), which was 2.47 times that of Cu-ZnS and maintained good stability during the reaction. The improvement of hydrogen production performance of the photocatalyst was mainly attributed to the synergistic effect of Cu-ZnS and co-catalyst NiMoP 2 . The ohmic contact formed between Cu-ZnS and NiMoP 2 could improve the separation efficiency of photogenerated carriers and reduce the overpotential of H 2 evolution. Besides, NiMoP 2 was found to provide the active site for the reduction reaction, and accelerate the transfer efficiency of photogenerated electrons. This strategy opens up a new way for the construction of co-catalyst modified semiconductor materials to improve the photocatalytic hydrogen production rate.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Jiatao Zhu,Shiliang Mei,Wu Yang,Guilin Zhang,Qiuhang Chen,Wanlu Zhang,Ruiqian Guo
In this work, transition metal ion- doped zinc-based quantum dots (QDs) are synthesized via a greener controllable method to avoid the toxicity of the traditional cadmium-based QDs and broaden the tunable emission. Herein, the tunable emission of Cu-doped ZnInS/ZnS core-shell QDs (Cu:ZnInS/ZnS) can cover from 500 to 620 nm by varying the Cu dopant concentration from 1 to 20% and the maximum quantum yield can reach 49.8%. Based on the single-doped QDs, Cu,Mn co-doped ZnInS/ZnS core-shell QDs (Cu,Mn:ZnInS/ZnS) with a photoluminance (PL) quantum yield of 30.4% are obtained. All the as-synthesized QDs have the zinc blende structure and the average size is about 3.55 nm. Besides, the interaction mechanism between the Cu and Mn dopant luminescence centers is proposed in this work, which is rarely investigated in the previous report. Diffusion priority and energy transfer between these two dopants are supposed to play an important role in the co-doped QDs and Cu ions could affect the splitting of Mn d states. Color coordinates of these doped QDs show the line-tunability from (0.200, 0.397) to (0.408, 0.508) on the Commission Internationale de L'Eclairage (CIE) chromatic diagram, showing a promising potential in high-quality white light output by integration of these QDs with blue chips.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Binghong Song,Caiting Li,Xueyu Du,Shanhong Li,Yindi Zhang,Yue Lyu,Qihao Zhou
A series of Cu-Ce binary oxides were synthesized via a facile co-precipitation method for toluene catalytic oxidation. The physicochemical properties of these samples were characterized by BET, XRD, SEM, TEM, H 2 -TPR, O 2 -TPD, and XPS. It reveals that Cu 1 Ce 3 catalyst possesses a higher specific surface area, stronger Cu-Ce synergistic effect, and better low-temperature reducibility than other samples. Moreover, Cu 1 Ce 3 catalyst exhibited superior toluene oxidation activity with 99.10% toluene removal efficiency and 97.28% CO 2 selectivity at 200 °C, as well as satisfactory stability and moisture resistance. Therefore, Cu 1 Ce 3 catalyst indicates a huge potential for practical applications, such as coal-fired flue gas and spray coating industry. The reaction pathways for toluene catalytic oxidation over the Cu 1 Ce 3 catalyst were further illuminated by in-situ DRIFTs. In the main pathway, toluene molecules were firstly in contact with the interface lattice oxygen, then the abstraction of H atoms occurred on the methyl group, and benzyl alcohol is considered as the primary intermediate, during which the rate-determining step is the oxidation of benzyl alcohol. In the secondary pathway, a little proportion of toluene molecules were directly oxidized into benzoic acid by the chemisorbed oxygen species. In subsequent steps, all the intermediates were converted into CO 2 and H 2 O. At last, it is confirmed that the toluene oxidation over Cu 1 Ce 3 catalyst involves a Mars-van-Krevelen mechanism via this study.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaoxia Zhang,Yongjin Wang,Junjie Liao,Jiancheng Wang,Liping Chang,Weiren Bao
Coke oven gas (COG) is a hydrogen-rich byproduct whose efficient utilization requires deep removal of organic sulfur compounds such as thiophene . While Cu-based sorbents exhibit excellent desulfurization performance, the influence of precursor structural characteristics on their activity remains poorly understood. In this study, the relationship between precursor assembly and desulfurization performance of unpromoted Cu/ZnO/Al 2 O 3 sorbents was systematically elucidated. Three synthesis routes were explored to tailor precursor structures, revealing that aurichalcite-derived precursors enable superior Cu dispersion, stronger Cu-Zn interaction, and enhanced reducibility of active sites. The optimized sorbent prepared via urea hydrolysis achieved an exceptional breakthrough sulfur capacity of 29.91 mg/g—nearly twice that of hydrotalcite-derived counterparts—without the use of additional promoters. Mechanistic analysis further demonstrates that the precursor structure governs the formation of highly reducible Cu species and promotes thiophene activation through improved hydrogenation pathways. These findings provide new insights into the design of high-performance Cu-based sorbents.
研究领域:
材料科学
·
化学工程
·
环境催化
·
能源利用
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Kun Chen,Huihuang Fang,Simson Wu,Xi Liu,Jianwei Zheng,Song Zhou,Xinping Duan,Yichao Zhuang,Shik Chi Edman Tsang,Youzhu Yuan
The direct hydrogenation of CO 2 to methanol has become a very active research field because CO 2 can be prospectively recycled to mitigate greenhouse effect and store clean synthetic fuels. This reaction can be catalyzed by supported Cu catalysts and the catalysts display strong support or promoter effects. Sintering of Cu species accelerates the separation of Cu–oxide interfaces, reduces the active component, and diminishes the methanol selectivity. In this work, we report a Cu catalyst supported on La-modified SBA-15, where the Cu–LaO x interface is generated through the interaction of highly dispersed Cu nanoparticles with LaO x species bedded into the SBA-15 pore wall. The optimized Cu 1 La 0.2 /SBA-15 catalyst can achieve methanol selectivity up to 81.2% with no deterioration in activity over 100 h on stream compared with the La-free catalyst. A thorough study reveals that La species not only significantly improve the CO 2 adsorption but also enhance Cu dispersion to produce well-dispersed active sites. The H/D exchange experiments show that the methanol synthesis displays a strong thermodynamic isotope effect and the Cu–LaO x interface plays a crucial role for the methanol synthesis rate in CO 2 /D 2 feed. In situ DRIFTS studies reveal that *HCOO and *OCH 3 species are the key intermediates formed during the activation of CO 2 and methanol synthesis over the Cu 1 La 0.2 /SBA-15 catalyst.
研究领域:
催化化学
·
能源化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Fumei Wang,Qi Cai,Xinhua He,Boxiong Shen,Leila Negahdar,Shuo Feng,Andrew M. Beale
Cu/SAPO-34 catalysts have been widely used for the reduction of NOx from diesel exhaust by ammonia-selective catalytic reduction (SCR). Sulfur poisoning remains a challenge for Cu/SAPO-34 catalysts in NH3–SCR, restricting its application. In this study, Cu/SAPO-34 samples containing a mixture of Cu species comprising isolated Cu2+ located in the 6MR, Cu(OH)+ in 8MR, CuO clusters/nanoparticles, and Cu+ species were prepared. The Cu speciation during SO2 and hydrothermal aging of Cu/SAPO-34 SCR catalysts was subsequently studied. While hydrothermal aging had little effect on catalytic activity, the sulfur-aged sample exhibited deterioration in NH3–SCR activity over the temperature range of 100–575 °C. The breakage and collapse of the zeotype framework and chemical deactivation of the Cu/SAPO-34 catalyst after exposure to SO2 and H2O took place. A combination of X-ray photoelectron spectroscopy (XPS) and TGA-DT-DSC revealed the presence of ammonium bisulfate, copper bisulfate/sulfate, aluminum sulfate, and sulfuric acid after SO2 and H2O copoisoning under SCR conditions. Furthermore, Cu(OH)+ tended to migrate to form isolated Cu2+ and Cu+, as well as agglomerate to form CuO particles. Density functional theory (DFT) calculations revealed that SO2 and O2 could readily be absorbed by CuO particles to form stable copper bisulfate/sulfate species with the following order of preference: CuO > Cu+ > Cu2+ > Cu(OH)+. In contrast, Cu(OH)+ was less prone to be poisoned by easily releasing SO3 than other Cu species sites.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lijun Chen,Chenguang Wang,Guozhao Liu,Guanwen Su,Leping Dang,Hongyuan Wei
Rational utilization of the surface charge property of components is an effective method to prepare heterojunction. The surface of g-C 3 N 4 nanosheets (CNs) and black phosphorous nanosheets (BPs) both exhibit negative charge, which would produce repulsive force to hinder them from approaching each other. Herein, non-noble and low-toxic Cu(II) was selected to harmonize the CNs and BPs together under the interaction of surface charges, and the Cu(II) was reduced in situ to Cu with good conductivity, obtaining the sandwich-like product BPs/Cu/CNs with tight interface and high separation efficiency of photogenerated carriers. The composites exhibited attractive degradation performance for various pollutants under visible light, especially, 95.3 % of ciprofloxacin (10 mg/L, 200 mL) was removed in 60 min with 50 mg of 6BPs/4Cu/CNs as photocatalyst, and the removal ratio can still reach 87.4 % after the fifth reuse with negligible leaching of Cu ions. An unconventional type-II band structure was built in the BPs/Cu/CNs under the drive of internal electric field and mutual attraction of opposite charges, in which the e - from CB of BPs transferred to Cu and then combined with the h + from VB of CNs, leaving the e - from CB of CNs and h + from VB of BPs still work. Despite the same result to that of typical type-II band structure of BPs/CNs, the flow of photogenerated carriers in the BPs/Cu/CNs was more favorable in thermodynamics.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Dongfang Wu,Qingqing Tan,Lichong Hu
A highly selective morphology formation of Cu-Ni bimetallic nanocrystals is developed with a solvothermal method, using poly(vinylpyrrolidone) (PVP) as capping agent and aniline as reducing agent in benzyl alcohol. It is shown that temperature is crucial to the controlled synthesis of nanocrystals, and that Cu-Ni nanoparticles evolve from hexagonal nanoplates to nanowires with increasing the concentration of pyrrolidone unit. The synthetic Cu-Ni hexagonal nanoplates and nanowires are well dispersed and have high crystallinity , purity, uniformity of shape and size, and face-centered cubic lattice structure. Furthermore, a mechanism of the formation of Cu-Ni nanocrystals is proposed, and the functions of capping agent, reducing agent, solvent, etc. are discussed. It is also found that both nanoplates and nanowires show better catalytic activities in o -xylene combustion than the conventional catalyst. Especially, the Cu-Ni nanowire catalyst exhibits the most excellent catalytic performance due to the formation of durian-like surface structure.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Xiaofeng Liu,Yuanyuan Sun,Hao Ren,Yan Lin,Mingbo Wu,Zhongtao Li
Electrochemically driven carbon–carbon coupling utilizing renewable electricity under ambient conditions has emerged as an innovative approach for synthesizing high-value chemicals, which still faces inherent challenges such as low conversion rates and poor selectivity. While electroreducing furfural to hydrofuroin can produce high-quality biofuel, its efficiency need to be promoted. Herein, Cu–Sn bimetallic catalyst has been developed with a conversion rate of furfural of >97% and hydrofuroin selectivity of >67% through equilibrium of the interfacial intermediate *H and *fur-CHOH, which exhibits the greatest state-of-the-art overall performance. Characterization and theoretical calculation reveal that Cu serves as the active site for generating *fur-CHOH, whose electron density can be decreased by introducing Sn, and results in a higher *fur-CHOH coverage and a lower energy barrier of dimerization. Moreover, adding Sn also enables sluggish *H formation to balance interfacial *fur-CHOH and *H, leading to reduced hydrogenation byproducts. The as-developed approach provides valuable insights for optimizing other C–C electrocoupling reactions for the synthesis of high-value chemicals.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Zhipeng Zhang,Feifei Li,Guoqiang Li,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Lulu Zhang,Fangfang Li,Jianxin Liu,Caimei Fan
The bottlenecks of photocatalytic nitrogen fixation are adsorption and activation of nitrogen, because N–N bond in dinitrogen is one of the strongest bonds in chemistry . Herein, for the first time, Cu-doped MIL-101(Fe) was applications in photocatalytic nitrogen fixation. The photocatalytic nitrogen fixation activity of Cu-MIL-101(Fe) is three times that of MIL-101(Fe). Characteristic of MIL-101(Fe) and Cu-MIL-101(Fe) are systematically compared by XRD , SEM, TEM, BET, PL and energy band structure . These results indicated that the Cu doping not only enlarge the specific surface area from 1413 m 2 /g to 2097 m 2 /g, but also increase the photoreduction capability from −0.13 V to −0.7 V. These results indicated that nitrogen adsorption and activation capacity can be improved by Cu doping. By combining metal ions doping and components regulation of MOFs , this work provides many future opportunities for enhance photocatalytic nitrogen fixation activity.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 48
·10495-10499
·
IF 3.879
Shufang Kou,Tingting Yao,Xiaofeng Xu,Rui Zhu,Qing Zhao,Jian Yang
Successful doping of anisotropic semiconductor nanocrystals with impurities offers an effective pathway to manipulate their physical properties and enhance the application performances. However, such doping into anisotropic nanocrystals is seldom reported because it needs simultaneous controls in the crystal growth for a specific shape and composition engineering for transition-metal doping. Here, ultrathin Cu-doped ZnSe nanorods are synthesized by a growth–doping process. The doped nanorods are characterized by XRD and TEM techniques to reveal their crystal structure. Their optical properties are described in terms of UV-Vis absorption spectra and PL spectra. The tunable emission from 480 to 520 nm evidences the successful doping of Cu into ZnSe nanorods. The effects of the reaction time, the reaction temperature and the surface ligand on the optical properties are discussed in detail. After purification, the doped nanorods with a Cu/Zn ratio of 1% give a quantum yield of 7%. This emission could be retained for weeks in air, which is important for its future applications in many fields.
研究领域:
材料科学
·
光学
✓ 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）