JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Qianni Bian,Shutao Li,Ruyang Shen,Shiqi Shen,Ziheng Wen,Xu Jiang,Faliang Gou
A mesoporous silica-supported Ni–Co composite metal oxide has been synthesized and applied as an effective heterogeneous catalyst for the selective catalytic oxidation of benzyl alcohols . Various characterization methods were employed to confirm the successful synthesis of the catalysts and their nanostructure . The catalytic performances of these catalysts in the selective oxidation of substituted benzyl alcohols to aromatic aldehydes were systematically investigated using molecular oxygen from the air as the oxidant under atmospheric pressure. The NiCo@SBA-15 catalyst exhibited remarkable performance, achieving nearly 98 % conversion and almost complete selectivity at a temperature of 120 °C for 10 h, operating at 1 atm of air pressure. This catalytic performance can be attributed to the synergistic effect between Ni and Co ions , resulting in the generation of new surface-active sites in the catalyst. The catalyst also demonstrated favorable applicability and universality. Moreover, A plausible catalytic mechanism has been proposed involving the synergistic effect between bimetal species and oxygen vacancy .
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 8
·2348-2358
·
IF 2.911
Lin Jin,Guo Yafei,Li Changhai,Lu Shouxiang,Chen Xiao,Liew Kim Meow
A series of supported and bulk Cu–Mn–Ce ternary oxide catalysts was synthesized by wet-impregnation (IM), deposition–precipitation (DP), traditional co-precipitation (CP), co-precipitation with cetyltrimethyl ammonium bromide (CC), and sol–gel (SG) methods. The supported catalysts (CuMn/Ce-IM, CuMn/Ce-DP) exhibited significantly higher activity for CO oxidation than the bulk catalysts (CuMnCe-CP, CuMnCe-CC and CuMnCe-SG). The improved performance could be attributed to the presence of more isolated CuO and MnO x entities on the surface of supported catalysts, which contributed to the efficient utilization of both lattice oxygen from CeO 2 and spillover oxygen from surface MnO x . For bulk catalysts, major Cu–Mn species were doped to form \({\text{C}}{{\text{u}}_{\text{x}}}{\text{M}}{{\text{n}}_{\text{y}}}{\text{C}}{{\text{e}}_{1 - {\text{x}} - {\text{y}}}}{{\text{O}}_{2 - {\text{z}}}}\) solid solutions and a part of them were coated by ceria mechanically. Lowest 50% CO conversion temperature were achieved at 76.9 °C for CuMn/Ce-IM catalyst. Low-temperature CO oxidation activities of all catalysts were in the sequence of CuMn/Ce-IM > CuMn/Ce-DP > CuMnCe-SG > CuMnCe-CC > CuMnCe-CP. Graphical Abstract
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2011
·
IF 3.463
Jing Wang,Zongbao Wang,Jun Li,Bingjie Wang,Ji Liu,Peng Chen,Menghe Miao,Qun Gu
Chemically modified chitin nanocrystals were synthesized by grafting poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (PHBV) onto chitin backbone via chlorination. Acetyl amino group was maintained in the reaction. The chemical structure and morphology of PHBV grafted chitin nanocrystals were characterized by Fourier transform infrared, Transmission electron microscopy and X-ray photoelectron spectroscopy. Contact angle measurement showed that the lipophilicity of chitin was improved by the surface modification. The effects of original chitin and PHBV-graft-chitin nanocrystals on the crystallizing and melting behavior of PHBV were studied by differential scanning calorimeter (DSC). The results indicated that both unmodified and modified chitin nanocrystals suppressed crystallization of PHBV. The melt point of PHBV was increased after being mixed with nanofillers.
研究领域:
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Runjiang Guo,Weixing Huo,Kaifeng Wang,Dongliang Shi,Jiadong Wu,Hua Li,Hezhou Liu
In this report, we synthesized novel Co–Zn co-doped stannate (Co x Zn 1-x SnO 3 ) hollow balls via an ion co-precipitation method. The as synthesized Co x Zn 1-x SnO 3 exhibited excellent dielectric and magnetic properties , which were conducive to the microwave absorption. We also embedded the as prepared Co x Zn 1-x SnO 3 nanoparticles into rGO 3D aerogels (rGO@Co x Zn 1-x SnO 3 ) to enhance their microwave absorbability. Several characterization techniques were utilized to investigate the structures, morphologies, compositions and specific surface areas of the Co x Zn 1-x SnO 3 and rGO@Co x Zn 1-x SnO 3 aerogels respectively. In addition, associated electromagnetic parameters of various as prepared samples were also measured to simulate the microwave absorbability of the 3D rGO@Co x Zn 1-x SnO 3 aerogels. The simulation results indicated that the maximum reflection loss (RL max ) of rGO@Co 0.7 Zn 0.3 SnO 3 could reach up to −38 dB at 10.6 GHz with an absorber thickness of only 3 mm. The maximum efficient absorption bandwidth (EAB) of the rGO@Co 0.7 Zn 0.3 SnO 3 hollow balls was over 8 GHz (from 10 GHz to 18 GHz) with an absorber thickness of only 3.5 mm. The enhanced performance was ascribed to high attenuation capability, reasonable impedance matching, multiple interfacial polarizations and proper synergistic effect. This work demonstrated that the rGO@Co x Zn 1-x SnO 3 aerogels with light-weight and strong microwave absorbability have great potential to be used as a microwave absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Jie Zhang,Chuang Li,Weixiang Guan,Xiaozhen Chen,Xiao Chen,Chi-Wing Tsang,Changhai Liang
Co(Ni)/MoO 3 catalysts were prepared, characterized and evaluated for the hydrogenolysis of bio-derived dibenzofuran (DBF), aiming at the understanding of the promoting effect of Co/Ni on MoO 3 for high-yield production of aromatic products. All Co(Ni)/MoO 3 catalysts selectively cleaved C-O bond, thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. The experimental results from varying Mo species by adjusting the reduction temperature of MoO 3 together with XPS and in-situ XRD characteristic were evident that Mo 5+ species was responsible as the major active specie for the reaction. Promotional effect between Co(Ni) and Mo in Co(Ni)/MoO 3 catalysts was observed, resulted from the presence of acidic Co(Ni)MoO 4 species and a large number of Mo 5+ species both of which were created local to the Co(Ni)-O-Mo interface, as can be characterized by in-situ XRD, XPS, H 2 -TPR, NH 3 -TPD, in-situ FT-IR, Raman and TEM. The trend of the initial reaction rate follows: MoO 3 (0.18 μmol∙g cat −1 ∙s −1 ) < Ni/MoO 3 (0.26 μmol∙g cat −1 ∙s −1 ) < Co/MoO 3 (0.29 μmol∙g cat −1 ∙s −1 ), corresponding to the decreasing activation barrier. And the best catalytic activity was observed for the 100% yield of BP over Co/MoO 3 . A possible mechanism, including Co(Ni) facilitated reduction of Mo 6+ to Mo 5+ and Co(Ni) enhanced formation of acidic sites, is proposed to be responsible for the high activity in Co(Ni)/MoO 3 catalysts.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
DOI
高影响因子
HELVETICA CHIMICA ACTA
·
2022
·Vol. 105
·期 6
·e202200017
·
IF 2.201
Geng-Wei Liu,Peng-Bin Pan,Xin Zhang,Yuan-Yuan Huang,Peng Liu,Ye-Yan Qin,Yuan-Gen Yao
Zinc titanate (ZnTiO 3 ) has recently been applied in various areas for its unique properties. Herein, through tuning the phase structures of ZnTiO 3 support, we synthesized two different Pd-based catalysts for CO oxidative coupling to DMO and further investigated their structure-activity relationships for the first time. The results indicated that the strong metal-support interaction between the cubic phase ZnTiO 3 and Pd species leads to an enriched Pd electronic density and promotes the bridged CO adsorption. As a result, the as-synthesized catalyst with cubic phase ZnTiO 3 performed a turnover frequency (TOF) of 339.3 min −1 , which was much higher than the hexagonal one (226.3 min −1 ).
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
IONICS
·
2024
·Vol. 30
·期 3
·1723-1733
·
IF 2.4
Zhao Ji-wei,Wei Zhi-qiang,Wang Can,Zhou Mei-pan,Lu Cheng-gong
The Co-based organic skeleton was combined with graphene oxide (GO) as a precursor, Ni 2+ hydrolysis etching was introduced, and finally, NiCo-LDH/GO was obtained. The final composite electrode material NiCo 2 S 4 /rGO was obtained by high-temperature vulcanization. The introduction of MOFs and rGO significantly increased the specific surface area of the material and made it have excellent electrochemical properties. The specific capacitance of the composite NiCo 2 S 4 /20rGO reaches an astonishing 272.5 mAh g −1 when the current density is 1 A g −1 . In addition, at a large current of 10 A g −1 , the specific capacitance of the material can also reach 139.5 mAh g −1 , and after a long cycle of 5000 cycles at such a current density, the capacity remains at the original 73.2%. With NiCo 2 S 4 /20rGO electrode material as the positive electrode and activated carbon as the negative electrode, the hybrid supercapacitor is assembled. At an energy density of 56.9 Wh kg −1 , its power density reaches an excellent 799 W kg −1 , and it still has a capacity retention rate of 74% at a current density of 10 A g −1 . The excellent properties of composites demonstrated in this work open up new possibilities for high-quality energy storage devices.
研究领域:
材料科学
·
电化学
·
储能
·
纳米技术
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Jingshan Hou,Jie Shi,Langping Dong,Jianghua Wu,Ganghua Zhang,Haijie Chen,Wei Gao,Yongzheng Fang
The discovery of pure-red emitting phosphor is great meaningful for the achievement of high color rendering index white light emitting diodes , but still a challenge due to the strict crystal field limitations. In this work, we demonstrate the preparation of a 630 nm pure-red emitting Ca 3 Si 2 O 7 :Eu 2+ phosphor for the first time through a CO reduction strategy. The changes in crystal field strength caused by different methods for the preparation of Ca 3 Si 2 O 7 :Eu 2+ are investigated and discussed based on the understanding of the thermodynamic theory and structure resolution. Finally, a white light-emitting diode with a high color rendering index (Ra = 98) is accomplished by combining the as-prepared Ca 3 Si 2 O 7 :Eu 2+ pure-red emitting phosphor with a 375 nm chip and the commercial used blue and green phosphors. The results also demonstrate the generalizability of the weak reduction strategy for the exploration of “redder” Eu 2+ doped phosphors.
研究领域:
材料科学
·
光电子学
·
固态物理
·
无机化学
·
照明技术
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yanfei Chen,Yukun Lu,Zekun Guan,Shoujie Liu,Chao Feng,Guangxun Sun,Jilei Liang,Yuan Pan,Chenguang Liu,Yunqi Liu
Herein, a novel single-molecule confinement-sulfurization strategy was proposed to construct ultrafine Co-MoS 2 monolayer catalysts by using oil-soluble single-molecule polyoxometalates (POMs), (DODA) 6 Co 2 Mo 10 , as precursors. Well-defined Co 2 Mo 10 -POM, acting as molecular pre-assembling platform, is introduced for the atomically precise construction of bimetallic sites. Highly efficient conversion of VR under severe condition is realized with (DODA) 6 Co 2 Mo 10 . The origin of prominent catalytic performance can be attributed to the in-situ formation of ultrafine single-layered Mo-based nanosheets with abundant exposed CoMoS active sites. By combining synchrotron radiation-based X-ray absorption spectroscopy and density functional theory calculations, we further discover that there is clearly intimate interaction between Mo and Co atoms and the dissociation of molecular hydrogen at CoMoS phases is energetically preferred, leading to remarkable hydrogenation and coke suppression activity. This work highlights an idea on the rational design and targeted synthesis of ultrafine bimetallic catalysts for slurry phase HCK with dramatically synergistic catalysis.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhihui Ma,Hongrui Guo,Pengfei Wang,Lichun Dai,Sihui Zhan,Feng Shen
The electrocatalytic oxidation of biomass-derived glucose to formic acid (FA) represents a sustainable route for biomass valorization, yet achieving simultaneous high selectivity and current density remains challenging due to sluggish electron transfer and competing side reactions. Herein, bimetallic oxide ultra-thin nanosheets grown on Ni foam (NiCoO-NS/NF) with established Ni-O-Co electronic channels are fabricated via a facile Cl − corrosion and calcination strategy. The ultra-thin nanosheet structure offers abundant exposed active sites, and the introduced Co 2+ with the unique valence electronic configuration is able to drive the partial electron migration from Ni to Co via the bridging μ-O ligand, forming Ni-O-Co electronic channels. This significantly facilitates electron transport and promotes rapid NiOOH active species formation, as evidenced by in situ spectroscopy measurements and computational analyses. Remarkably, NiCoO-NS/NF exhibits an exceptional GOR current density of 222.70 mA/cm 2 at 1.4 V vs RHE, surpassing NiO-NS/NF and bare Ni foam by 2.29-fold and 7.53-fold, respectively. The enhanced kinetics suppress non-Faradaic degradation, delivering a high Faradaic efficiency beyond 90.00 % within 1 h in 0.1 M glucose. This work provides a novel strategy for constructing electron-channel-rich nanostructures to effectively enhance the performance of glucose electrooxidation over Ni-based catalysts, advancing the development of biomass upgrading.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chang Miao,Meiling Ma,Yingrui Sui,Yue Cui,Zhanwu Wang,Lili Yang,Fengyou Wang,Xiaoyan Liu,Bin Yao
Environmentally benign and earth-abundant constituent’s kieserite Cu 2 ZnSn (S, Se) 4 (Cotises) is considered as a hopeful photovoltaic material. Unfortunately, the severe tail state caused by various harmful deep defects in CZTSSe absorber prevents further development of its device efficiency. Here, we report firstly that the Co was incorporated into CZTSSe films to form the Cu 2 Co x Zn 1-x Sn (S, Se) 4 (CCZTSSe) films using a two-step annealing and solution-processing technique method. Through optimized the Co/(Co+Zn) ratio, the CCZTSSe film has excellent good surface morphology and single-phase composition. Appropriate amount of Co elements replacing Zn elements in CZTSSe films can effectively reduce the degree of Cu-Zn disorder, thus inhibiting [2Cu Zn +Sn Zn ] defect clusters and Cu Zn defects. The detrimental deep defects located in the film were effectively passivated to reduce electrostatic potential fluctuations, resulting in relief of the trailing state. Therefore, a champion device having an efficiency of 7.50 % with a fill factor (FF) of 61.00 % was achieved from CCZTSSe with 3 % Co content. This work provides new insights into the impacts of Co doping in CZTSSe by a solution processed method and offers a deeper comprehension of the origin of the efficiency enhancement of CCZTSSe devices.
研究领域:
材料科学
·
能源技术
·
半导体物理
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Haotian Li,Hongyi Li,Zicong Yang,Jiayi Xu,Jiangwen Xu,Jinxu Song,Yukun Chang,Hui Song,Xiaoyu Ma,Rui Pan,Shujun Chen
Introducing other non-precious metals and tailoring the structure to develop Pt-based alloy catalysts is a viable strategy to reduce Pt massive consumption, enhance Pt utilization, and improve the performance of electrocatalysts. In this study, a novel kind of Pt-Co nanoframe alloy catalyst with a hierarchical nanostructure and two distinct particle morphologies has been obtained by using a simple synthetic method. The unique multi-level core-shell structure imparts higher intrinsic activity and conductivity to the Pt-Co Core-shell Nano particles (Pt-Co CSNP), facilitating efficient charge transfer and enhancing both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities. At a current density of 10 mA cm -2 , the Pt-Co CSNP demonstrates excellent electrocatalytic performance, exhibiting overpotentials of 14.7 mV for HER in 0.5 M H 2 SO 4 and 200 mV for OER in 1.0 M KOH, which is a significant improvement over the performance of numerous reported catalysts. According to the mass activity calculation, the Pt-Co CSNP exhibit mass activities of 5.55 and 3.17 A mg Pt -1 for HER and OER, respectively. These values are improved by a factor of 22 and 35 times compared with those of commercial electrodes (Pt/C 20 %, RuO 2 ) at the same overpotential. After 300 h of operation, the catalyst shows minimal performance degradation, making it one of the most effective catalysts for dual-function HER/OER catalysis.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能量转换
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）