APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Feifei Li,Mingyue Wang,Jinming Zhang,Xingtao Lin,Dazhi Wang,Weijie Cai
The design of highly efficient catalysts for CO 2 reforming with ethanol is of great interest due to the serious coke deposition and the sintering of active metal. In this work, sandwich-type Co core@shell catalyst (SiO 2 @Co@CeO 2 ) with Co nanoparticles between SiO 2 core and CeO 2 shell was synthesized by strong electrostatic adsorption method. Interestingly, SiO 2 @Co@CeO 2 catalyst exhibited the outstanding activity/stability toward CO 2 reforming of ethanol in comparison with Co-SiO 2 catalyst. A bi-functional mechanism involving active sites on CeO 2 shell was proposed. Indeed, cobalt nanoparticles between SiO 2 core and CeO 2 shell maintained the high dispersion because of the confinement effect, which supplied a stable Co-ceria interface area where the reaction occurred. In addition, CO 2 could readily react with the O vacancies in CeO 2 shell to form surface oxygen species and CO, which allowed a continuous cleaning of coke. These positive factors could make it as an attractive candidate for dry reforming process.
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高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Huiyuan Cheng,Zihao Fan,Xuemei Wu,Manman Feng,Wentao Zheng,Guangping Lei,Xiangcun Li,Fujun Cui,Gaohong He
Single-atom catalysts (SACs) with well-defined active sites provide an efficient route for catalyzing CO 2 reduction reaction (CO 2 RR). Although enormous attention has been focused on metal-N x moieties, understanding the effect of metal-C coordination and engineering of the hybrid metal-N/C sites have rarely been reported. Herein, we fabricated Co SACs with tunable isolated Co-N 5-x C x ( x = 1, 2, 3) sites supported on porous carbon frameworks. Benefiting from the difference in electronegativity of the coordinated N and C atoms, the CO Faradaic efficiency (FE CO ) enhanced considerably from 54% to 76% and 92% at −0.8 V vs . RHE for Co-N 4 C 1 , Co-N 3 C 2 , and Co-N 2 C 3 , respectively. Further density functional theory (DFT) calculations uncover that the increased ratio of Co-C coordination induced electron enrichment of Co atoms and upper-shift the d -band center to near Fermi level, and thus favorably promotes the electron-donating ability of Co centers and strengthens the adsorption of *COOH.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Wenhu Yang,Hao Guo,Liguo Yue,Qi Li,Mengni Xu,Longwen Zhang,Tian Fan,Wu Yang
In this present paper, a novel layered multi-metal sulphide was reported as a positive electrode material with abundant electroactive sites and redox reaction centres. Molybdenum and sulfur elements were introduced into the metal-organic frameworks (M-MOF: M = Ni, Co and Ni/Co) to synthesize layered MMoS x by a hydrothermal method . The electrochemical performance comparison of MOFs and six electrode materials demonstrated that NiCoMoS x electrode materials had the best electrochemical performance and the highest specific capacitance. The highest specific capacitance could reach 2595 F g −1 at a current density of 1 A g −1 . The NiCoMoS x electrode material also had an excellent cycle stability with a retention rate of 90.8% after 10,000 charge and discharge cycles. In addition, the as-assembled NiCoMoS x //AC assymmetric supercapacitor (ASC) device exhibited a maximum energy density of 48.2 Wh·kg −1 at a power density of 807.2 W kg −1 , and the capacity retention rate after 10,000 charge and discharge cycles was 91.6%. This electrochemical performance indicated that this kind of material had a good market development prospect.
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高影响因子
Journal of CO2 Utilization
·
2019
·
IF 5.189
Miao Wang,Xiaona Ren,Gang Yuan,Xiaopo Niu,Qingli Xu,Wenluan Gao,Shuaikang Zhu,Qingfa Wang
Element doping is an effective strategy to enhance the selectivity of electrochemical carbon dioxide reduction. In this work, a dendritic core-shell In-doped Cu@Cu 2 O catalyst is prepared by co-electrodeposition method on carbon fiber paper for selective electroreduction of CO 2 to CO. Faradaic efficiency of producing CO over this dendritic In-doped Cu@Cu 2 O reaches 87.6 ± 2.2% with total current density of 11.1 ± 0.85 mA cm −2 at −0.8 V vs RHE, which outperforms most of the reported Cu-based electrocatalysts. The excellent performance is mainly derived from charge re-distribution and the enhanced intrinsic activity due to the formation of In-doped Cu 2 O layer. Meanwhile, the Cu + /Cu 0 can be adjusted by tailoring the doped-In content. The relatively high ECSA and small charge transfer resistance are also conducive to improve the selectivity and activity. The oxyphilic In metal incorporated into the copper lattice can well stabilize the intermediate *COOH through enhancing interaction with O-ends of *COOH. This work provides a facile approach and a deep insight on design and synthesis of high efficiency hybrid electrocatalysts.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2019
·
IF 2.066
Amin Khan,Haojie Yu,Yang Wang,Li Wang,Raja Summe Ullah,Fazal Haq,Tarig Elshaarani,Muhammad Usman,Ahsan Nazir,Kaleem-ur-Rehman Naveed
Different copolymers (poly(2-(methacryloyloxy) ethyl ferrocene carboxylate- co -methacrylo-4-aminoazobenzene- co -methacrylic acid)s) (P(FHEMA- co -MAZO- co -MAA)s) were synthesized and their different properties were analyzed in this work. Methacrylic acid was introduced as a side group to possibly affect the photostability. The synthesized copolymers were characterized by nuclear magnetic resonance ( 1 H NMR) spectroscopy and gel permeation chromatography (GPC). Thermal studies were performed by thermogravimetric (TG), differential thermogravimetric (DTG) and differential scanning calorimetry (DSC) analysis, which showed that the copolymers were thermally stable under the operating conditions of the information storage devices. Redox studies and photoresponsive studies were performed by CV technique and UV/vis spectroscopy which showed that these copolymers contained good redox and photoresponsive properties. The obtained results paved the way towards the four states information storage of the materials.
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RSC Advances
·
2023
·Vol. 13
·期 13
·8901-8914
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IF 3.9
Xinkuai He,Zhousi Hu,Qingtian Zou,Jingjing Yang,Ruqing Guo,Luye Wu
The preparation of active, stable and low-cost non-noble electrocatalysts for the hydrogen evolution reaction (HER) using the electrochemical water splitting process is crucial for the promotion of sustainable energy. In this study, Co–Ni alloys with various Co contents are prepared using a galvanostatic method and the co-deposition behavior of Co2+ and Ni2+ in ethylene glycol (EG) is reported. These results indicate that the presence of additional Ni2+ species can accelerate the Co–Ni co-deposition process and Co2+ species in the system can inhibit the reduction of Ni2+. Moreover, the two effects are improved with an increase in Ni2+ or Co2+ species concentration in the EG system, respectively. Chronoamperometry records show that the Co–Ni electro-crystallization mechanism is one of 3D instantaneous nucleation and growth. Moreover, the Co–Ni alloy with 59.46 wt% Co exhibits high electrocatalytic activity for HER with an overpotential of 133 mV at 10 mA cm−2 in 1 M KOH due to a high value of electrochemical active surface area (ECSA) (955.0 cm2). Therefore, the Co–Ni alloy electrocatalyst obtained from the EG system could be a promising candidate for practical hydrogen production.
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PubMed
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2022
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IF 5.062
Hao Wu,Jia Ma,Shuaiqi Qian,Wenhao Jiang,Yuxi Liu,Jingjuan Li,Zhongcheng Ke,Kai Feng
The co-amorphous system is an efficacious approach in enhancing the solubility and dissolution of insoluble drugs. Several small molecules, such as organic acids, amino acids, and organic amines, are commonly used ligands to prepare co-amorphous systems. In this study, a co-amorphous system of posaconazole (POS), a weakly alkaline insoluble drug, with citric acid (CA) was prepared by the solvent evaporation method. An amorphous solid dispersion (ASD) of POS-VA64 was also prepared for comparison. Powder X-ray diffraction pattern and scanning electron microscopy indicated that POS exists in an amorphous form in the POS-CA and POS-VA64 groups. Fourier-transform infrared spectroscopy showed that an intermolecular hydrogen bonding was formed between POS and CA in the co-amorphous system. The amorphous state of POS exhibited increased solubility and dissolution, and the POS-CA form showed the best solubility and dissolution, which may be attributed to the amorphization and acidic environment provided by CA. In addition, the pharmacokinetic study and stability test of the POS-CA form showed superior performance. Therefore, the rational use of small-molecule ligands to prepare co-amorphous compounds can significantly improve the properties of drugs.
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Catalysis Science & Technology
·
2024
·Vol. 14
·期 3
·667-672
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IF 4.4
Qiulan Huang,Ruiqin Ren,Jia Li,Muhammad Waqas,Pan Chen,Xiaotian Liu,Dujuan Huang,Zhongyun Yang,Xinglan Peng,Du-Hong Chen,Youjun Fan,Wei Chen
Fabricating highly competent and cost-effective catalysts is essential for promoting the sluggish kinetics associated with the oxygen reduction reaction (ORR). Herein, a new type of Fe, Co decorated porous carbon composite catalyst co-doped with S and N (FeCo–SNC) was prepared by a simple carbonization process. Interestingly, FeCo–SNC inherits not only the pore structure but also the large surface area of the ZIF-67 dodecahedron. Furthermore, the electronic configuration of the two catalytic centers in Fe–N–C and Co–NC was customized. On the basis of synergetic coordination between the two active sites, the fabricated FeCo–SNC showed prior stability for the ORR even after 10 000 cycles of cyclic voltammetry measurement, besides the great limiting current density of 5.99 mA cm−2 and high half potential of 0.856 V (vs. reversible hydrogen electrode), surpassing the commercially available Pt/C catalyst. Moreover, the primary active site of Fe–N–C was regulated, providing the highest catalytic activity for the ORR. This research offers a new perspective on enhancing carbon-based catalysts for the ORR without relying on precious metals and introduces a strategic method for controlling active centers.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Long Daojun,Liu Yongduo,Ping Xinyu,Chen Fadong,Tao Xiongxin,Xie Zhenyang,Wang Minjian,Wang Meng,Li Li,Guo Lin,Chen Siguo,Wei Zidong
The serious problem of carbon monoxide (CO) poisoning on the surface of Pt-based catalysts has long constrained the commercialization of proton exchange membrane fuel cells (PEMFCs). Regeneration of Pt sites by maintaining CO scavenging ability through precise construction of the surface and interface structure of the catalyst is the key to obtaining high-performance CO-resistant catalysts. Here, we used molybdenum carbide (MoC x ) as the support for Pt and introduced Ru single atoms (SA-Ru) at the Pt-MoC x interface to jointly decrease the CO adsorption strength on Pt. More importantly, the MoC x and SA-Ru are immune to CO poisoning, which continuously assists in the oxidation of adsorbed CO by generating oxygen species from water dissociation. These two effects combine to confer this anode catalyst (SA-Ru@Pt/MoC x ) remarkable CO tolerance and the ability to operate stably in fuel cell with high CO concentration (power output 85.5 mW cm −2 @20,000 ppm CO + H 2 – O 2 ), making it possible to directly use the cheap reformed hydrogen as the fuel for PEMFCs.
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NANO
·
2016
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IF 0.951
Jingge Liu,Ang Cao,Jing Si,Lihong Zhang,Qinglan Hao,Yuan Liu
Sintering of the active metallic nanoparticles and carbon deposition are the key problems faced for CO methanation catalysts. For overcoming those problems, bimetallic nanocatalyst is a promising route. In this work, a series of Al 2 O 3 supported Ni-Co alloy catalysts were prepared by reducing NiCoAl layered double hydrotalcite (LDHs), and characterized with X-ray diffraction (XRD), temperature programmed reduction TPR, N 2 adsorption-desorption, transmission electron microscopy (TEM) and temperature programed oxidation (TPO) techniques. The resultant catalysts were mesoporous with nanoparticles of Ni-Co alloy ranging from 7.9 nm to 9.2 nm which were highly dispersed in alumina matrix. The sample Ni 7 Co 3 -Al 2 O 3 catalysts showed very good catalytic performance during the stability test at 500/600 ∘ C for 300 h, meanwhile exhibited excellent anti-sintering ability and anti-carbon deposition ability, owing to the formation of Ni-Co alloy and the feature of LDHs. This strategy for improving anti-sintering and anti-carbon deposition should be extendable for catalysts of other reactions.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Fang Ping Wang,Jun Ying Zhang,Hu Po Mu,Wan Xia Li,Ting Yuan,Xin Zhen Du
A pH-sensitive hydrogel [P(CE- co -DMAEMA- co -MEG)] was synthesized by the free-radical crosslinking polymerization of N,N -dimethylaminoethyl methacrylate (DMAEMA), poly(ethylene glycol) methyl ether methacrylate(MPEG-Mac) and methoxyl poly(ethylene glycol)-poly(caprolactone)-methacryloyl methchloride (PCE-Mac). The effects of pH and monomer content on swelling property, swelling and deswelling kinetics of the hydrogels were examined and hydrogel microstructures were investigated by SEM. Sodium salicylate was chosen as a model drug and the controlled-release properties of hydrogels were pilot studied. The results indicated that the swelling ratios of the gels in stimulated gastric fluids (SGF, pH = 1.4) were higher than those in stimulated intestinal fluids (SIF, pH = 7.4), and followed a non-Fickian and a Fickian diffusion mechanism, respectively. In vitro release studies showed that its release rate depends on different swelling of the network as a function of the environmental pH and DMAEMA content. SEM micrographs showed homogenous pore structure of the hydrogel with open pores at pH 1.4. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40737.
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JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2013
·Vol. 51
·期 20
·1494-1504
·
IF 2.221
Yi Chen,Yuanqin Xiong,Chang Peng,Wenyong Liu,Yue Peng,Weijian Xu
Polyhedral oligomeric silsesquioxane hybrid temperature and pH double-responsive hydrogels with organic–inorganic co-crosslinked networks are synthesized by in situ , free-radical polymerization of N -isopropylacrylamide and dimethylaminoethyl methacrylate in the presence of both organic crosslinker N , N ′-methylenebis(acrylamide) (BIS) and inorganic crosslinker octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) in tetrahydrofuran media. The resulting hydrogels (OR-OvP gels) display obvious temperature and pH double responsiveness, OvPOSS particles dispersed in polymer make a dominant effect on the properties of gels. With the increase of OvPOSS, the aggregation of particles on nano- or microscale happens and causes a considerable change on the properties of gels, such as the lower critical solution temperature and better compression strength. Specially, the interconnected microporous structure of gels ascribed to the microphase separation results in faster deswelling rate, which makes the gel become attractive. Besides, the crosslink by BIS intensifies the heterogeneity of gels significantly, which could also be used to adjust the properties of gels. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013 , 51 , 1494–1504
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