RSC Advances
·
2022
·Vol. 12
·期 20
·12702-12709
·
IF 4.036
Yi Lu,Haibo Pan,Jiafeng Lai,Yuzhou Xia,Lu Chen,Ruowen Liang,Guiyang Yan,Renkung Huang
Effective design of photocatalysts is an effective method to improve the separation of photogenerated carriers, which improves the photocatalytic performance of photocatalysts. In this work, CoCu-ZIF materials with bimetallic structure were synthesized at room temperature for efficient photocatalytic fuel denitrification. The properties and structures of CoCu-ZIF photocatalysts can be effectively controlled by adjusting the molar ratio of cobalt to copper. The as-prepared CoCu-ZIF photocatalysts were characterized by XRD, FT-IR, SEM, TEM, UV-vis, Raman, BET and other techniques. The photoactivity of CoCu-ZIF for the denitrogenation of NCCs has been evaluated using visible light (λ ≥ 420 nm). The results indicate that Co8Cu2-ZIF photocatalysts exhibit excellent photocatalytic properties, in which the denitrification rate almost reached 80% after 4 hours under visible light irradiation, which is higher than the degradation ability of ZIF-67 (38%). Transient photoelectrochemical experiments and EIS Nyquist plots indicate that Co8Cu2-ZIF with unique structure efficiently improves the separation and transfer of photogenerated electron–hole pairs. Moreover, a possible reaction mechanism was proposed by LC-MS analysis.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Shunan Yin,Jinxian Zhao,Shiping Wu,Xuhui Wang,Yanhong Quan,Jun Ren
Electrochemical reduction of CO 2 to valuable chemicals using electricity from renewable sources is a promising approach to realize the carbon cycle. Here, a novel bimetallic nitrogen-doped carbon catalyst (M-N-C, where M denotes the metal) CoCu–N–C electrocatalyst has been synthesized by pyrolyzing a copper-doped cobalt(II) acetate–phenanthroline complex formed from the metal acetates and 1,10-phenanthroline dissolved in ethanol. The optimal CoCu–N–C catalyst with molar ratio of Cu/(Co + Cu) = 0.15 displayed superior performance, enabling a faradaic efficiency of CO production of 76.5% at an overpotential of 0.57 V as well as an increased CO current density of 8.48 mA cm −2 at −0.98 V versus reversible hydrogen electrode (far superior than the Co–N–C of 4.20 mA cm −2 and Cu–N–C of 0.07 mA cm −2 ) and a decreased charge-transfer resistance compared with Co–N–C and Cu–N–C catalysts. The addition of Cu, which serves as a structure promoter to improve the dispersion of Co, thereby providing sufficient Co-N x active sites for the electrochemical CO 2 reduction reaction (CRR). Moreover, doping Cu changes the electronic environment around Co slightly and promotes the charge transfer capability so that reduces the energy barrier of potential-limiting energy, thereby improving the CRR performance of catalyst.
研究领域:
材料科学
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电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Zhen-Hong He,Na Li,Kuan Wang,Wei-Tao Wang,Zhao-Tie Liu
Quinoline derivatives are widely exist in the environment, and mainly separated from the coal tar pitch fraction. Hydrogenation of these compounds to 1,2,3,4-tetrahydroquinolines, an important class of natural products and medicinal agents, is a significant transformation of waste to valuable chemicals. In the present work, we developed a cheap and highly efficient Co 3 Cu 1 O x bimetallic catalyst and used it for the hydrogenation of quinolines at a temperature down to 60 °C. The introduction of Cu into Co catalyst changed the physical and chemical features of Co catalyst, which was characterized by Raman spectra, N 2 -adsorption/desorption isotherms, H 2 -TPR and H 2 -TPD tests. The recycling experiments indicated the catalyst was stable and possessed good reusability. Importantly, the gram-scale experiment provided a high yield (92%) to the target product, demonstrating that the catalytic system has a potential practical application.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jie Zhou,Qingdi Sun,Yuhan Qin,Hao Liu,Peng Hu,Chao Xiong,Hongbing Ji
Propane dehydrogenation (PDH) has been an outstanding technique with a bright prospect, which can meet the growing global demand for propylene. However, undesired side reactions result in the deactivation of the Pt-based catalysts, which contribute to the insufficient lifetime of the catalysts. Herein, we describe a novel catalyst by encapsulating bimetallic CoCu-modified Pt species in S-1 zeolite for efficient dehydrogenation of propane, which synergizes the confinement of zeolites and the geometric and electronic effects on Pt species for enhancing the catalyst stability. The introduction of bimetallic additives efficiently promotes the dispersion of platinum and the electron transfer between Pt species and the additives, which greatly prolongs the lifetime of the catalysts. Particularly, no obvious deactivation is observed on 0.2Pt0.3Co0.5CuK@S-1 after 93 h on stream with a weight hourly space velocity (WHSV) of 5.4 h −1 , revealing an ultralow deactivation constant of 0.0011 h −1 (t = 909 h). The formation rate of propylene still maintains at a high value of 407 mol g Pt -1 h −1 (WHSV = 21.6 h −1 ) at 580 ℃ even after on pure propane stream for 42 h. The catalyst with the bimetallic CoCu-modified Pt species in S-1 zeolite reveals ultra-high activity and stability for PDH, which is ascribed to the highly dispersed Pt species and the stabilization effect of bimetallic additives on Pt species.
研究领域:
催化
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Saiya Guo,Wentao Lin,Manman Shi,Jieding Wei,Wei Che,Jong-Beom Baek,Yonghong Ni
It has been attracting extensive research interest how to promote the electrocatalytic performance of transition-metal layered double hydroxides (LDHs) for water splitting. Here, we designed a heteroatom-doping and conductive metal-organic frameworks (cMOFs) co-modification strategy to successfully construct a Ru-doped CoCu-HHTP (HHTP=2,3,6,7,10,11-hexahydroxytriphenylene) /CoCu-LDH nanosheets array on the Cu foam substrate (labeled as CoCuRu-HHTP/CoCu-LDH). Electrochemical measurements showed that CoCu-LDH, CoCuRu-LDH, CoCu-HHTP/CoCu-LDH and CoCuRu-HHTP/CoCu-LDH separately required an overpotential of 204 mV, 175 mV, 69 mV, 27 mV to deliver the current density of -10 mA cm-2 for HER; and 345 mV, 216 mV, 275 mV, 204 mV to reach the current density of 10 mA cm-2 for OER; in 1 M KOH solution. The above facts clearly demonstrate that the present co-modification strategy significantly enhances the electrocatalytic water splitting performance of CoCu-LDH. In a two-electrode setup using the as-prepared CoCuRu-HHTP/CoCu-LDH nanosheets array as the cathode and anode simultaneously, only a cell voltage of 1.48 V was required to deliver the current density of 10 mA cm-2, which is comparable to that of pure noble metal-based materials and outperforms most MOF-based catalysts reported.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Liang Li,Demin Jiang,Sainan Cai,Shikuo Li,Yuqiao Wang
The sluggish reaction kinetics of the oxygen reduction reaction (ORR) and the formation of a biofilm on the cathode prevent efficient and stable operation of microbial fuel cells (MFCs). In this work, zeolitic imidazolate framework-derived N-doped carbon-supported CoCu-layered double hydroxide nanosheets (CoCu-LDH@NC) were synthesized as a bifunctional cathode catalyst for MFCs. CoCu-LDH supported on CoO@NC induced the production of carbon nanotubes (CNTs) from the NC matrix. CNTs and CoCu-LDH nanosheets improved the atomic reaction efficiency and active area for the ORR. The high-speed electron-transfer channel was attributed to two-dimensional CoCu-LDH nanosheets and one-dimensional CNTs. The catalytic activity and stability of CoO@NC were sustained through the incorporation of CoCu-LDH nanosheets. The electronic interaction of CoCu-LDH and CoO@NC enhanced the ORR catalytic activities. CoCu-LDH nanosheets generated reactive oxygen species (ROS) and Cu+, improving the antibacterial activity to prevent the growth of biofilm for MFCs. CoCu-LDH@NC demonstrated superior oxygen reduction activity with a half-wave potential of 0.84 V and an onset potential of 0.89 V. The maximum power density and operating cycle of the MFCs assembled with CoCu-LDH@NC reached 1012 mW m–2 and 170 h, respectively. This work offers guidance to enhancing the ORR catalytic activity and stability by designing antibacterial ORR catalysts.
研究领域:
材料科学
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环境科学
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电化学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xing Liu,Jing Wang,Yuting Zhang,Gang Guo,Jiakuan Yang,Shushan Yuan,Bart Van der Bruggen
Catalytic ceramic membranes (CCM) have attracted increasing attention in membrane material research due to their catalytic and separation functions. However, it is difficult to obtain stable CCM with excellent catalytic performance via common methods. Herein, SiC ceramic membrane loaded with Co, Cu bimetal were prepared by vacuum filtration method and heat treated at H 2 atmosphere (CoCu@SiC-H CCM). Results confirmed that heat-treated at H 2 atmosphere can enhance the catalytic performance of membrane. The first-order rate constant of the CoCu@SiC-H CCM/ peroxymonosulfate(PMS) system reached 0.01473 ms −1 , which is 10 3 -10 5 times greater than previously researches (0.0409–0.7588 min −1 ). Optimal CoCu@SiC-H CCM/PMS system achieved 98.02 % degradation of sulfamethoxazole in 1 min. The CoCu@SiC-H CCM presents outstanding catalytic performance due to the generation of Co 0 and the increase of oxygen vacancy concentration. OH and SO 4 − play important roles in the CoCu@SiC-H CCM/PMS degradation system. This work provides a new design method for preparing catalytic ceramic membranes with excellent catalytic performance, which can efficiently treat refractory wastewater in harsh environments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2020
·Vol. 13
·期 16
·4151-4158
·
IF 7.962
Huai Liu,Ning Ding,Junnan Wei,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Huayu Fang,Tianyuan Li,Lu Lin
Graphical No base needed : N-doped carbon-supported CoCu bimetallic catalyst with enhanced O 2 activation ability and basicity is demonstrated as an effective catalyst for the oxidative esterification of 5-hydroxymethylfurfural. The introduction of Cu significantly enhances the catalytic activity, resulting in a high furan-2,5-dimethylcarboxylate yield and an impressive formation rate, paving the way for the efficient and green synthesis of sustainable bio-based polymer monomers. The direct fabrication of furan-2,5-dimethylcarboxylate (FDMC), a promising renewable monomer, from biomass-derived 5-hydroxymethylfurfural (HMF) is a cutting-edge process. In this contribution, an elaborately designed N-doped carbon-supported CoCu bimetallic catalyst (Co x Cu y -NC; x / y= 9:1, 7:3, 4:6, which represents the designed molar ratio of Co and Cu in the catalyst), which could offer a desirable FDMC yield of 95 % under mild and base-free conditions (Co 7 Cu 3 -NC, 2 bar O 2 , 80 °C, 4 h) is described for the oxidative esterification of HMF. Notably, an FDMC formation rate of 6.1 mol FDMC mol Co −1 h −1 was achieved over Co 7 Cu 3 -NC, which represents the highest catalytic efficiency so far among Co-based catalytic systems. It has been demonstrated that Cu-doping in Co 7 Cu 3 -NC catalyst brings about more active sites (Co-N x species) with stronger molecular oxygen activation ability. The increase of surface N content of Co 7 Cu 3 -NC also improves basicity of the catalyst, which favors the hydrogen abstraction process during the HMF oxidative esterification reaction. These findings may pave an efficient and green way for the synthesis of sustainable bio-based polymer monomers.
研究领域:
催化化学
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生物质转化
·
绿色化学
✓ 已验证
DOI
高影响因子
Advanced Healthcare Materials
·
2021
·Vol. 11
·期 8
·2102074
·
IF 9.933
Tian Hu,Chuncheung Chan,Min-Zhao Lin,Huaitian Bu,Bin Liu,Gang-Biao Jiang
Self-regenerative hydrogels have recently been developed, and represent a special type of self-healing hydrogels with the ability to restore a dehydrated hydrogel with physical damage. In this study, a self-regenerative hydrogel (COCu) based on two chitosan polymers assembled by slow-released Cu 2+ is developed. The COCu hydrogel displays an excellent regeneration ability after being dehydrated and fractured. By simple hydration at room temperature, the fragments of the dehydrated gel fuse into one seamless whole, thereby preserving the mechanical properties and functionalities of the original hydrogel. The regeneration process can be conducted repeatedly after different methods of dehydration (natural volatilization, heat drying, lyophilization) and various modes of deconstruction (flakes, powder, lumpy sponge, etc.). Furthermore, the COCu hydrogel provides ultra-stretchability, and it can be stretched into thin (0.01–0.1 mm) filaments, which, when dried (dtCOCu), can be used as suture lines. Moreover, when used as a dry suture, it regenerates into the hydrogel in the presence of the tissue fluid, forming an excellent sealant to immobilize tissues and seamlessly seal wounds. The fast self-regeneration allows for its facile application as both a hydrated gel dressing and dry suture, and offers customized strategies for fixing and repair of different wounds in soft tissues.
研究领域:
材料科学
·
生物医学工程
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xiaoyu Wang,Dejun Wang,Yanhong Lin,Tengfeng Xie
To enhance the oxygen evolution reaction (OER) performance of the zinc-air battery (ZAB), reduce charging voltage, and improve energy utilization efficiency, a sunlight-assisted strategy has been implemented. The photo-assisted rechargeable ZAB was proposed, featuring Ti–Fe 2 O 3 decorated with Co 0 · 8 Cu 0.2 -ZIF as the air electrode. Upon illumination, valence band holes were generated in Ti–Fe 2 O 3 , oxidizing Co 2+ in Co 0 · .8 Cu 0.2 -ZIF to Co 3+ /Co 4+ , enhancing OER performance, reducing the charging voltage from 2 V to 1.3 V and effectively narrowing the charging-discharging voltage gap from approximately 1.15 V–0.45 V. The Ti–Fe 2 O 3 /Co 0 · 8 Cu 0.2 -ZIF structure maintains a round-trip efficiency of 65.3% after 300 cycles. This result demonstrates the successful integration of photoelectrochemical principles with ZAB technology, showcasing its efficacy in solar energy storage and light energy conversion.
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Guoqiang Xie,Guofu Li,Di Chen,Xiangyu Meng,Chuanjun Fan,Beili Pang,Yingchao Zhang,Yingjie Chen,Liyan Yu,Lifeng Dong
Non-enzymatic glucose detections have attracted more and more attentions with the development of electrochemical catalysts. Herein, Co 2+ and Cu 2+ are introduced into the hexagonal prism of melamine cyanurate, and nitrogen-doped carbon seaweed-like nanosheets (CoCu@MC) are synthesized through pyrolysis . CoCu@MC shows superior electrochemical catalytic activity for glucose oxidation with high sensitivity (1.489 μA μM −1 cm −2 ), low detection limit (0.34 μM) and wide linear range (1 μM–1.25 mM). Also, CoCu@MC demonstrates excellent application potential for glucose detection in artificial sweat with good conductivity, fast electron transfer , and high selectivity, which result from CoCu bimetal composites and seaweed-like carbon nanostructures . The glassy carbon electrode coated with CoCu@MC was used as the working electrode along with Ag/AgCl as the reference electrode and carbon rod as the counter electrode. The findings above will provide a general methodology to design and synthesize different carbon nanostructures through the addition of different transition metal cations.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Chem Catalysis
·
2025
·
IF 11.6
Bin Zhu,Jie Yang,Qiuge Wang,Xiao Yu,Shilin Fan,Weiping Xie,Jian Zhang,Chunlin Chen
The intersection of corrosion engineering for constructing high-performance electrocatalysts and the efficient upgrading of biomass represents two vibrant, sustainable research themes that promise exciting outcomes when combined. In this study, we achieve the highly selective hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan (BHMF) over corrosion-induced CoCu microwire arrays on copper foam (CoCuMW/CF). An HMF conversion of 95.7% and a BHMF yield of 85.4% can be achieved in the electrochemical process. Mechanistic investigations indicate that the reaction pathway is primarily governed by the Langmuir-Hinshelwood (L-H) mechanism. Density functional theory (DFT) calculations reveal that the CoCu interface exhibits lower free energy barriers for the hydrogenation steps of HMF, which significantly enhances the catalytic performance and BHMF selectivity. The induction of corrosion enhances the electrochemical hydrogenation performance of the copper-based electrocatalyst, which holds significant value in reducing catalyst costs and accelerating the application of HMF electrohydrogenation.
研究领域:
材料科学
·
催化化学
·
可再生资源转化
·
电化学
✓ 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）