JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhenjiang Li,Chenghai Gao,Huimin Zhao,Alan Meng,Shiqi Ding,Xuehua Wang,Shaoxiang Li
Exploration of new non-precious metal catalysts for highly efficient oxygen reduction reaction (ORR) is essential for sustainable energy utilization technologies. Herein, porous biomass-derived carbon modified by Cu, N co-doping and Cu nanoparticles was synthesized by hydrothermal followed pyrolysis strategy, and used for electrocatalytic ORR. The optimized Cu/Cu-N-C catalyst exhibits large surface area (235.91 cm 3 g −1 ) and hierarchical pore structure . Benefiting from the above factors, the Cu/Cu-N-C catalyst performs a high onset potential (E onset , 0.947 V vs. reversible hydrogen potential (RHE)) and a half-wave potential (E 1/2 , 0.875 V vs. RHE) in 0.1 M KOH solution. The calculated electron transfer number of 3.92 suggests the near-four-electron ORR process. Besides, the Cu/Cu-N-C catalyst also performs extraordinary stability and higher methanol tolerance than Pt/C. In addition, the assembled Zn-air battery based on the optimized Cu/Cu-N-C catalyst exhibits a higher power density of 150.7 mW cm −2 than the that of Pt/C-based battery. This work put forward a newfangled method to fabricate efficient ORR catalyst by loading active component on biomass-derived carbon, which follows the sustainable development concept, and provides a profitable reference for designing nonprecious metal carbon-based ORR electrocatalyst .
研究领域:
能源材料科学
·
电催化
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Ze Chai,Chuanhai Jiang
The electrochemical/chemical growth of porous (Ni,Co,Cu)(OH) 2 was reported based on the corrosion behaviors of Ni-Co-Cu films in neutral salt spray . The films prepared by using electrodeposition were ternary solid solution alloys with a simple phase structure, strong texture, nanoscale grains, large microstrain and a large number of crystal defects . The unique microstructures coupled with extensive ion diffusion during the subsequent corrosion process facilitated the formation of ternary hydroxides with uniform and porous nanostructures . The ternary hydroxides composed of Ni-/Co-dominant hydrotalcite-like and Cu-dominant orthorhombic (Ni,Co,Cu)(OH) 2 could be efficiently prepared by motivating the transformation from oxide to hydroxide. The binder-free (Ni,Co,Cu)(OH) 2 electrode exhibited a high specific capacitance of 1738 F g −1 at a current density of 20 A g −1 and decent cycling stability. The electrochemical/chemical growth mode, uniform porous nanostructures and nature of the ternary hydroxides could account for the superior electrochemical performances. This work proposed a simple and green approach to prepare multicomponent hydroxides as novel electrode materials for rechargeable batteries and hybrid supercapacitors .
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
·
腐蚀科学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2024
·
IF 5.8
Jingwei Hong,Wanli Li,Jin Shang,Hiromi Yamashita,Yun Hu
Utilizing electrocatalysis to convert CO2 into high-value industrial raw materials can not only effectively reduce CO2 emissions but also achieve a closed carbon cycle. This method holds great potential for addressing global warming and alleviating the fossil fuel crisis. Here, we report a novel electrocatalyst for CO2 reduction composed of a composite material derived from Cu-MOF74 and Cu2O, synthesized under the regulation of an appropriate amount of KOH. The research results indicate that the unique Cu0/Cu+ interface in Cu-MOF74/Cu2O-350 enhances the adsorption of reaction intermediates, providing more active sites for CO2 reduction. Additionally, the moderate carbonization during the thermal treatment process increases conductivity and enriches the electrochemical active surface area, accelerating the charge transfer rate. Consequently, this composite exhibits excellent CO2 reduction performance. At -1.3 V vs. RHE, the Faraday efficiency (FE) for C2H4 production reached up to 32.48%, which was significantly higher than that of pure Cu2O-350 (9.25%) and Cu-MOF74-350 (15.52%). Even after 6 hours of reaction, the FE for C2H4 remained above 24.52%, reflecting its good stability. Furthermore, we utilized in-situ infrared spectroscopy to study the key intermediates of the relevant reduction products, inferring the possible reaction pathways for the formation of HCOOH and C2H4. This study provides a simple synthesis method for the preparation of high-selectivity MOF-derived composite catalysts for the electrocatalytic reduction of CO2 to value-added chemicals.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yang Liu,Hailong Feng,Weiyi Li,Xueping Wang,Guoxiang Huang,Longxia Wang,Xingqiu Li,Yuxing Xie,Chenglu Liang
Catalysts in-situ reconstructed from transition metal sulfides for oxygen evolution reaction (OER) have been regarded as potential alternatives for the noble metal catalysts . Intriguingly, it was found that the self-optimized SO 4 2− @Cu doped Co(OH) 2 catalyst was reconstructed from bimetallic sulfide of CuCo 2 S 4 . During the OER process, the copper was partially leached and meantime doped into the in-situ generated Co(OH) 2 with SO 4 2− adsorption, while only oxides were discovered in counterparts of mono-metal sulfides. As a result, the SO 4 2− @Cu doped Co(OH) 2 catalyst exhibited superior OER performances, with low overpotentials of 211/272 mV to achieve the current densities of 10/100 mA cm −2 , exceeding the counterparts reconstructed from mono-metal sulfides. Experimental and theoretical results suggested that the in situ generated Cu doped Co(OH) 2 possessed thin and loosely layered structure with expanded lattice spacing (lattice spacing expanded from 0.28 nm to 0.46 nm) due to the SO 4 2− adsorption, making the intermediates more accessible to the active centers. In addition, the catalyst surface changed from hydrophobicity to super hydrophilicity , which greatly accelerated the mass transfer. This work indicated that the in-situ reconstruction process was greatly influenced by the interactions between metal sites and sulfide species, directly influencing the OER performances of the reconstructed catalysts.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Zhengwen Li,Jiajun Zhang,Wei Pan,Shuairen Qian,Yuhan Wang,Dong Su,Liguo Wang,Binhang Yan
Single-atom catalysts for alkyne semi-hydrogenation have been extensively investigated due to their high metal utilization and improved olefin selectivity. However, their reactivity is hindered by the sluggish activation of reactants on isolated sites. Herein, a non-precise metal catalyst consisting of Ni-Cu hetero-diatomic pairs was prepared using a sequential deposition method. The diatomic sites catalyst exhibited an unprecedented activity among non-precious catalysts with over 98% conversion and 77 mol C2H2 mol metal −1 h −1 at 180 °C, whereas the single-atom catalysts of Cu/C and Ni/C were almost inert under the same conditions. Experimental and theoretical results revealed the crucial diatomic synergy between the Ni-Cu pairs, wherein acetylene was adsorbed on Ni sites and hydrogen was adsorbed on Cu sites, and the diatomic site enabled spontaneous desorption of ethylene. The superior activity of the diatomic catalyst was observed, resulting from the enhanced dominance of d -electrons of Ni near the Fermi level. The research demonstrates an approach to designing non-precise metal catalysts with extraordinary catalytic performance for alkyne hydrogenation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2021
·Vol. 31
·期 2
·1317-1324
·
IF 1.819
Jin Ling,Jiang Kaiyong,Kang Lei,Yan Binggong
Copper and copper alloys own high thermal conductivity, electrical conductivity, good plasticity, and corrosion resistance, which are widely used in electric power, aerospace, and marine engineering. Due to low absorption rate of infrared and near infrared light, high thermal conductivity and high activity with oxygen, laser cladding of copper, and copper alloys are difficult to be conducted in air since the problems associated to cracks and voids are always hardly to be eliminated. In this paper, C-Al 2 O 3 -Cu composite powder mixed with Ni and Fe was developed to solve these problems. Use of carbon was to depress the oxidation and improve the laser absorption, while alumina was used to improve the laser absorption and mechanical strength. To improve the bonding strength between cladding layer and substrate, Ni and Fe were used. Experimental results showed that no obvious aggregation was observed and the powder showed good fluidity. The tensile strength of the cladding layer is 406.7 ± 0.1MPa which is about 1.7 times higher than that of pure copper substrate, and the tensile fracture of the cladding layer revealed microporous aggregation fracture due to the existence of Al 2 O 3 in the cladding layer.
研究领域:
材料科学
·
激光技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 4
·678-685
·
IF 3.382
Xiao Shao,Tianyong Zhang,Bin Li,Yue Wu,Xiaoyuan Ma,Jingchao Wang,Shuang Jiang
Copper sulfide (Cu2−xS) is a kind of cation deficient transition metal sulfide, which has attracted great interest due to its unique properties that arise from degenerate vacancy-doping, particularly its tunable localized surface plasmon resonance (LSPR) properties. In this work, a range of vacancy-doped Cu2−xS nanocrystals (NCs) (Cu1.2S, Cu1.4S, Cu1.75S, and Cu1.94S NCs) with a size of around 10 nm was prepared with tunable LSPR through a hot injection method. The doping level was manipulated effectively by varying the injection volume of sulfur powder–oleic acid (S–OA) to finely tune the LSPR wavelength. Cu2−xS NCs with four different doping levels were investigated as photocatalysts for degradation of dyes. The Cu1.94S NCs with the highest LSPR energy exhibited the best photocatalytic activity due to the highest free carrier density, presumably influenced by Cu vacancies and the volume of the S–OA solution. Theoretical calculations of the free carrier density of Cu2−xS NCs are consistent with the order of the photocatalytic activity. The results demonstrate that the correlation of the photocatalytic activity with the corresponding concentration of free holes and the LSPR wavelength is of interest, which will provide inspiration for the design of non-noble metal catalysts by regulating the free hole concentration in degenerate p-doped Cu2−xS caused by cation vacancies.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Sai-Li Zheng,Yonghe He,Xiao-Kang Qiu,Yuan-Hui Zhong,Lai-Hon Chung,Wei-Ming Liao,Jun He
A novel metal-organic framework [CuCN(TMBP)·H 2 O] n ( TCuCN ) has been synthesized by the reaction of 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (TMBP) and CuCN. Its structure was determined by single-crystal X-ray diffraction (SCXRD) analysis and further characterized by power X-ray diffraction (PXRD) analysis, FT-IR spectroscopy and thermogravimetric (TG) analysis. Previously reported structurally analogous TCuCl , TCuBr , TCuI have also been synthesized for Br 2 adsorption comparison. All of these four MOFs exhibited reversible uptake of Br 2 vapor judging by the unchanged PXRD patterns . Among four MOFs, Br 2 -loaded TCuI showed the most uptake amount of Br 2 (15.7 wt%), providing the formula to be TCuI ·0.33Br 2 . The different uptake amount of Br 2 for TCuX (X = CN, Cl, Br, I) should be mainly ascribed to the intermolecular interaction between CuX and Br 2 .
研究领域:
无机化学
·
材料化学
·
配位化学
·
多孔材料
·
气体吸附
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2021
·Vol. 91
·期 4
·726-731
·
IF 0.868
Xu Y.,Hu Y.,Bao Q.,Zhang J.,Liu B.,Zhang Z.,Zhang Q.,Zhang H.
Copper phyllosilicate has been synthesized from a solution of sodium silicate and copper nitrate by co-precipitation under acidic conditions followed by reduction under H 2 flow for using it as the Cu/SiO 2 catalyst. The catalyst has been characterized by XRD, XPS, FTIR and Raman spectra, EDS, BET, and TEM. It is confirmed that only copper phyllosilicate and SiO 2 exist in the catalyst precursor, and there has been no CuO. Physical and chemical properties of Cu/SiO 2 catalyst have been evaluated. The Cu/SiO 2 catalyst has not only a large specific surface area and abundant mesopores but also the advantages of high dispersion of copper nanoparticles and the combination of Cu 0 and Cu + . The catalyst demonstrates high activity and selectivity in the reaction of 2-butanol dehydrogenation to methyl ethyl ketone.
研究领域:
催化化学
·
材料科学
·
物理化学
·
纳米材料
·
有机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
M.Z. Chu,C. Zhang,X.H. Liang,C.H. Hu,G.T. Ma,R.Y. Fang,Chengying Tang
The Au-Cu nanoalloys (NPs) were produced by NaBH 4 co-reduction from the mixture precursor solution of component Au and Cu, under the protection of sodium citrate stabilizer . The Au-Cu NPs encapsulated in SiO 2 , Au 5 Cu 5 @SiO 2 NPs, were then synthesized by the Stöber method based on the obtained Au-Cu NPs. The microstructure and particle sizes were characterized by TEM observation. The phase transition temperature of Au-Cu@SiO 2 was determined by DSC measurement. The surface tension, surface segregation and surface energy of Au-Cu NPs as a function of particle size and temperature were calculated by the theoretical model based on the thermodynamic properties of pure component of Au and Cu NPs, respectively. The thermodynamic parameters of Au-Cu system at various nanoscales were optimized on the basis of experimental and theoretical results in this work and previous results in literature. Based on the obtained the thermodynamic data set, the nano phase diagrams of the Au-Cu system at nanoscale were calculated, and the thermodynamic properties of Au-Cu nanometer system were obtained. The results show that the calculated results agree well with experimental work.
研究领域:
纳米材料
·
热力学
·
合金物理
·
相变
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Reports: Energy
·
2022
·
IF 0
Zhanyou Xu,Yi Xie,Ying Wang
Electrochemical CO 2 reduction reaction (CO 2 RR) exhibits remarkable potential in producing valuable chemicals with renewable energy. Operating CO 2 RR in acidic media is beneficial to solve the issue of low carbon utilization brought by (bi)carbonate formation at the cathode. Suppressing the competing hydrogen evolution reaction and achieving stable CO 2 RR performance remains challenging. Herein, we constructed a 3-dimensional Cu (3D-Cu) gas diffusion electrode (GDE) to achieve efficient C 2 H 4 production with a partial current density ( j C2H4 ) of over 470 mA cm −2 and a Faradaic efficiency (FE C2H4 ) of 40%. With pause electrolysis, the decay rate of the j C2H4 is only half that of the traditional constant electrolysis. The GDE after constant electrolysis was found to suffer from severe salt formation, leading to the decreased activity and poor stability.
研究领域:
电化学
·
材料科学
·
能源化学
✓ 已验证
DOI
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Jian Zhang,Yazhe Zhang,Jieqiong Zhao,Zhe An,Yanru Zhu,Xin Shu,Hongyan Song,Xu Xiang,Xiaodan Ma,Jing He
Oxidative carbonylation has attracted broad interest from both academia and industry in recent years. Oxycarbonylation of ethanol to diethyl carbonate (DEC) has been of great challenge due to the difficulty in the simultaneous activation of ethanol and CO. This work reports a heterogeneous Cu-Pd pair catalysis for simultaneous activation of ethanol and CO, affording a selectivity of 85.4% to DEC and a space–time yield (STY) of up to 207 mg∙g −1 ∙h −1 . Well distributed Cu-Pd pair affords more Cu (I) sites, promoting CO activation and the followed insertion to adsorbed ethanol. Further increasing ratio of Cu (I) species via the pre-treatment of catalyst with CO and ethanol promotes simultaneously the activation of ethanol and CO, affording a STY of 325 mg∙g −1 ∙h −1 of DEC.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）