CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bowen Lu,Ziqiang Han,Xinyu Zhi,Liqi Zhang
NiFe 2 O 4 exhibits excellent redox properties and is widely applied in catalytic reactions. However, rapid inactivation under reaction conditions limited its industrial applications. In this study, CeO 2 -NiFe 2 O 4 composite catalysts were synthesized, and the Reverse Water Gas Shift (RWGS) reaction was measured to reveal its CO 2 hydrogenation performance under a high-temperature condition. NiFe 2 O 4 catalysts got deactivated after being reduced to Fe-Ni alloy at 700 °C, decreasing the CO 2 conversion rate. CeO 2 addition can significantly improve its high-temperature activity, and 20CeO 2 -NiFe 2 O 4 exhibited the best catalytic activity (80.85 %, 700 °C). The CeO 2 -confined maintained Ni-Fe alloy with a relatively small crystal size and larger specific surface area, supporting more active sites for CO 2 hydrogenation. CeO 2 addition induced higher oxygen vacancy concentration, enhancing CO 2 activation and formates species formed on 20CeO 2 -NiFe 2 O 4 , resulting in higher CO 2 conversion activity. In addition, 20CeO 2 -NiFe 2 O 4 maintained its catalytic stability for 50 h at 700 °C. The CeO 2 confined enhanced the high-temperature stability of Fe-Ni alloy. CeO 2 and formed CeFeO 3 dispersed in 20CeO 2 -NiFe 2 O 4 inhibited excessive aggregation of Fe-Ni alloy, and CeO 2 inhibited carbon deposition on Fe-Ni alloy, improving Fe-Ni alloy’s reaction stability under RWGS reaction conditions. CeO 2 confined may give insight into improving metal stability under high-temperature and reductive conditions in heterogeneous catalysis.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wei Lu,Hongpo Liu,Shiquan Li,Jianhua Zhu,Yunfeng Chao,Zhuosen Wang,Yapeng Tian,Xinwei Cui
Sodium selenium (Na-Se) batteries are considered promising candidates for next-generation energy storage devices due to their high volumetric energy density. However, the Se cathode still faces the problems of the shuttling effect and sluggish selenium reduction kinetics. Improving the surface adsorption and catalytic process of selenium cathode can greatly solve the above issues and achieve excellent performance to enhance the application of Na-Se batteries. Herein, experimental and theoretical simulation results indicate that the boron and defects co-doped MXene (BD-MXene) could initiate the redistribution of electrons and improve the surface polarity, promoting chemical adsorption, thus effectively suppressing the shuttle effect. More importantly, the BD-MXene can promote the conversion between polyselenide, accelerating the electrochemical reaction kinetics of Sodium polyselenide. As a result, the obtained Se@BD-MXene exhibits a high rate performance of 502 mAh g −1 at 50 A g −1 (calculated based on Se@BD-MXene) and excellent cycling stability with a decay per cycle of 0.001 % over 4500 at 10 A g −1 . This work provides a viable strategy to design Se cathodes for Na-Se batteries with high-rate capability and long-term cycling.
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高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 45
·455401
·
IF 3.953
Hongjing Wang,Hongyong Chen,Shuli Yin,Qiqi Mao,Chunjie Li,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
Nonmetal doping is a promising strategy to improve electrocatalytic performance of noble metal based catalysts for oxygen reduction reaction (ORR). Herein, we report a facile method to fabricate PdCuBP nanothorn assemblies (PdCuBP NTAs) by co-doping B and P into pre-synthesized PdCu NTAs using NaBH4 and NaH2PO2 as B source and P source, respectively. The metal-nonmetal structure and multi-branched morphology can optimize oxygen adsorption energy and avoid catalyst migration, agglomeration and Ostwald ripening. As such, the obtained PdCuBP NTAs exhibit efficient activity and excellent long-term stability for ORR. This research offers an excellent strategy for co-doping nonmetal elements into metal nanocrystals with controllable composition and structure to improve electrocatalytic ORR performance.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Caimei He,Yezheng Cai,Zhaoling Ma,Xinxian Zhong,Hongqiang Wang,Qingyu Li,Youguo Huang
Molybdenum carbide (Mo2C) with unique Pt-like electronic structure displays promising electrocatalysis for oxygen reduction reaction (ORR). However, the oxygen adsorption of Mo2C is overly strong for boosted catalytic activity. Herein, this work developed a bidirectional electronegative heteroatom doping strategy to tune the electronic cloud density of Mo2C. Boron and nitrogen, which have different electronegativities compared to Mo, co-doped nano-Mo2C moieties embedded in a nanoporous nitrogen-doped carbon frame (B,N-Mo2C/NPNC) were synthesized via a cross-linking–pyrolysis process. The introduced B not only tailored the electronic structure of Mo2C but also created additional electron-deficient B active sites for ORR. Additionally, the unique nanoporous carbon structure with dominant nanochannels benefits the exposure of specific surface areas and fast mass transfer. As a result, compared to N-Mo2C/NPNC without B tuning, B,N-Mo2C/NPNC exhibited superior ORR catalytic activity comparable to commercial Pt/C catalysts, making it outstanding among the Mo-based ORR catalysts. Moreover, B,N-Mo2C/NPNC showed robust catalytic stability for ORR with little shift in half-wave potential even after 10,000 cycles. As a cathode catalyst, a B,N-Mo2C/NPNC-driven zinc-air battery displayed discharge performance superior to the Pt/C-driven one, heralding promising application prospects. This work provided a feasible strategy for boosting the ORR catalytic activity of molybdenum carbide by simultaneously tuning the electronic structure, creating auxiliary active site, and constructing three-dimensional opening nanoporous carbon structures, which can be extended to other metal catalysts for energy conversion.
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Yong Wang,Jiajian Liu,Chuncheng Li,Yaonan Xiao,Shaohua Wu,Bo Zhang
The emergence of biodegradable materials has greatly solved the problem of environmental pollution caused by plastics, but there are still challenges in how to balance the thermal properties, mechanical properties and degradation properties of materials. In this work, a series of poly(butylene terephthalate-co-glycolic acid) (PBTGA) copolyesters with high molecular weights and different glycolic acid content were synthesized via bulk melt polycondensation. TGA demonstrated that the thermal decomposition temperature of all copolyesters were above 360 °C, which indicated the copolyesters had excellent thermal stability. DSC and XRD showed that the crystallization of the copolyester was deteriorated with the increase of glycolic acid content, corresponding to melting temperature decreased. The copolyesters had tensile strength of 18.7–46.2 MPa, tensile modulus of 20–1061 MPa and elongation at break between 196–487%. Degradation experiments showed that the weight loss of PBTGA copolyesters in 12 weeks was more than 20%. Through the copolymerization of GA and BT units, GA not only endowed the copolyesters with the ability of rapid degradation, but also kept the copolyesters excellent performance. Therefore, the PBTGAs we synthesized gave us a potential possibility to solve the problem of the plastic pollution.
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POLYMER BULLETIN
·
2024
·Vol. 81
·期 11
·10351-10367
·
IF 3.1
Wang Guoqiang,Wu Yifan
Polylactic acid (PLA), which is widely used in degradable packaging and medicine, has attracted much attention in recent years. However, PLA's ductility and processability still need to be improved. Previous literature indicated that poly(butylene diglycolate-co-butylene terephthalate) (PBDT) had good ductility, and degradability due to the introduction of diglycolic acid's ether group. Based on the above advantages of PBDT, the PLA/PBDT blends were prepared to improve the ductility of PLA. The blends' thermal, crystallinity, mechanical, and rheological properties and compatibility were characterized. The blends all showed greater elongation at break compared to PLA. The WAXD results showed that the tensile specimens of PBDT were semi-crystalline, and the tensile specimens of PLA and the blends were almost amorphous. The incorporation of PBDT caused the fracture behaviour of the blends to change from brittle to ductile behaviour. It is concluded that PBDT can effectively improve the ductility of PLA and the blend with 20 wt.% PBDT has high elongation at break (135%).
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高影响因子
NANO
·
2024
·
IF 1
Sai Wang,En-Ni Wu,Liang Meng,Zhen-Jun Wang,Tuan-Tuan Wang
To improve the activation efficiency of PMS to efficiently degrade antibiotic sulfadiazine (SD), herein, a Co@MoS 2 catalyst was prepared by a one-step hydrothermal process. The unique petal-like structure of MoS 2 enables the transition metal Co to achieve high dispersion and avoid agglomeration. Mo(IV) and unsaturated S accelerate the electron transfer between Co 2 + and Co 3 + to improve the cycling efficiency and thus realize the efficient activation of PMS. The results of active substance quenching experiment and ESR analysis show that the main active substance for the efficient degradation of SD by Co@MoS 2 is the non-radical 1 O 2 , while the other three radicals ⋅ O − 2 , ⋅OH and SO • − 4 contribute significantly to the efficient degradation of SD. And after 5 cycles, the degradation could still be as high as 90%. The strong consolidation of Co on the petal-shaped sheet of MoS 2 ensures the stability of Co@MoS 2 catalyst.
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高影响因子
Heliyon
·
2023
·
IF 4
Peng Zhang,Fang Cao,Jiqin Zhang,Ying Tan,Shengtao Yao
The past decades have witnessed great progress in nanoparticle‐based cancer‐targeting drug delivery systems, but their therapeutic potentials is yet to be fully exploited. In this research, temozolomide (TMZ) and chloroquine (CQ) were loaded into the mesoporous silica nanoparticles (MSNs), the surface was coated with polydopamine (PDA), and the complex was coupled with arginine-glycine-aspartic (RGD) to successfully prepare TMZ/CQ@MSN-RGD. RGD-MSNs accumulated more in the cell and tumor models than in unmodified MSNs in the in vitro and in vivo experiments and can directly induce apoptosis and autophagy in tumor cells. In addition, TMZ/CQ@MSN-RGD therapy enhanced the apoptosis effect of the RGD-MSNs in glioma. Therefore, the combination of autophagy inhibitor with chemotherapy drugs in nanocarriers may promote therapeutic efficacy in treating glioma.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yanfei Li,Yuanyuan Fu,Wenbin Liu,Yonghai Song,Li Wang
A novel hollow Co-Co 3 O 4 coated with carbon nanotubes (CNTs) nanostructure was designed. Here, zeolite imidazolate framework-67 cubes were used as sacrificial template and carbonized under H 2 /Ar atmosphere along with in-situ growth of CNTs to form Co nanostructures@CNTs. Then the Co nanostructures@CNTs was treated by thermal-oxidation under air to further construct hollow Co-Co 3 O 4 @CNTs. The obtained hollow Co-Co 3 O 4 @CNTs was characterized by scanning electron microscopy, transmission electron microscopy , N 2 adsorption/desorption isotherms, X-ray powder diffraction, X-ray photoelectron spectroscopy and electrochemical techniques . It was found that the hollow Co-Co 3 O 4 @CNTs cubes were wrapped by lots of CNTs. As it was used as anode materials for lithium ion batteries (LIBs), after cycling 200 cycles at 0.2 A g −1 , the reversible capacity was still kept at 806.7 mA h g −1 . Excellent cycle stability and Li + storage capacity originated from the hollow nanostructures and the encapsulation of CNTs around hollow Co-Co 3 O 4 cubes to buffer the volume change of Co 3 O 4 and improve the electrical conductivity . Meanwhile, the increased specific surface area could effectively improve the storage of Li + . Therefore, the hollow Co-Co 3 O 4 @CNTs might have potential application in LIBs.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Na Lei,Pianpian Ma,Bo Yu,Shuhong Li,Jianming Dai,Guohua Jiang
The perovskite-type SrMn 0.875 Nb 0.125 O 3 (SMN) and SrCo 0.875 Nb 0.125 O 3 (SCN) materials are prepared through the solid-state reaction method as novel oxygen-intercalated electrode materials for supercapacitor . The crystal structure, powder morphology, and electrochemical performance have been characterized in detail. SMN exhibits a six-layer hexagonal (6 H ) structure with space group P 6 3 / mmc , while SCN shows the tetragonal structure of space group P 4/ mmm . Under the three-electrode system with 1 M Na 2 SO 4 neutral electrolyte solution, the specific capacitance ( C s ) of SCN can reach 894 mF cm −2 at 1 mA cm −2 , which is 4.7 times the value of SMN at the same condition. For SCN, the superiority of electrochemical performance is attributed to its porous surface morphology , perovskite structure with shorter B O bond length and large B-O-B bond angle, and a higher oxygen vacancy content. When combined with activated carbon (AC) electrode, the SCN//AC asymmetric supercapacitor with a working voltage of 2.0 V presents a specific energy density of 82.33 μWh cm −2 , while maintaining prominent cycling stability with a capacity retention of 88.88% after 10,000 cycles.
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高影响因子
Energy Technology
·
2023
·Vol. 11
·期 9
·2300150
·
IF 3.8
Xiaoni Liu,Shenghao Zhang,Yaqi Fan,Yu Zhang,Caixia Li,Bo Yang,Minge Tian,Mengyu Liu,Lei Wang
Cobalt-based compounds have been extensively studied due to their relatively high theoretical capacity as anode materials for sodium-ion batteries (SIBs). However, the requirement for strong conductivity and excellent cycling stability is still an urgent challenge for the energy-storage system. To address these problems, metal–organic-framework-74-derived porous rod-shaped nanostructure Co/C materials are designed as advanced anode materials for SIBs, which is beneficial for the reaction kinetics of SIBs. Moreover, the efficient synergistic utility of the nanostructure and the rich mesopores of Co/C materials provides the ion-diffusion paths and active sites for the transfer and storage of Na + , which contributes to the energy-storage ability. The indurative structure of the carbonization electrode material can alleviate the influence of volume change due to Na + insertion/extraction. Therefore, the Co/C anode exhibits a high Coulombic efficiency of 94.3% at 0.1 A g −1 . After 300 cycles, the Na + -storage capacity is 200.4 mAh g −1 , and the Coulombic efficiency is 99.0%, where the capacity retention rate is up to 88.2%. Herein, insight is provided into the role of porous Co/C material in improving the kinetics of Na + reaction, supplying an effective strategy for the rational design of key materials for high-performance rechargeable batteries.
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JOURNAL OF FOOD ENGINEERING
·
2020
·
IF 4.499
Jia Zhang,Wenhua Xu,Fengying Xu,Wangwang Lu,Liuyun Hu,Jianlin Zhou,Chen Zhang,Zhuo Jiang
Droplet microfluidics offer many advantages for microscale droplet generation and have great application potential in food emulsion processing. To employ novel technique to develop microfluidic chips, new devices based on a co-flow regime were fabricated by microscale 3D printing via projection microstereoscopic lithography and were applied to produce single emulsion and double emulsion . The results showed that monodisperse water-in-oil (W/O) and oil-in-water (O/W) single emulsion could be produced in the same device with a coefficient of variation (CV) less than 3%. The parallelized microfluidic device has 5 droplet generators and can generate different types of single emulsions with a CV of approximately 3%. Furthermore, double emulsion droplets could be produced without surface treatment. The development of micro 3D printing provides a new way of microfluidics emulsion formation in food, especially for double emulsion formation, which has the great advantage of no surface treatment. These devices provide considerable support for further commercial application of droplet microfluidics.
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高影响因子
危险品化学品经营许可证（带存储）