MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2018
·
IF 2.593
Pengfei Hu,Changchun Chen,Jiawei Song,Zhonghai Tang
Specific surface area of photocatalyst usually has an important influence on its photocatalytic performance. Herein, mesoporous ZnFe 2 O 4 /ZnO nanocomposites were successfully fabricated by facile calcination methods using ZnFe 2 O 4 /ZIF-8 as the precursor. The structure, morphology, optical and adsorption properties of the as-prepared samples were detailedly characterized, and photocatalytic performances of these samples were mainly evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation (λ > 400 nm). The results demonstrated that the ZnFe 2 O 4 /ZnO hybrids are of enhanced visible-light photocatalytic performances among all the samples, indicating that the heterojunction structure between ZnFe 2 O 4 and ZnO efficiently inhibited the the recombination of photogenerated electron-hole pairs. Wherein, the ZFO/C6A4 sample prepared via two-step calcination method (600 °C in Ar and then 400 °C in air ambient) possessed higher visible light photocatalytic activity than the ZFO/A6 sample prepared via one-step calcination (600 °C in air ambient). This phenomenon was probably ascribed to the lager pore volume and average pore size of ZFO/C6A4 sample. Moreover, the potential carbon doping in ZnO particles during two-step calcination process was inferred by the XRD analysis , which further facilitated the separation of photogenerated electron-hole pairs in the ZFO/C6A4 sample. On the other hand, the composite sample also exhibited good magnetic recovery property and photochemical stability. These results indicated that the ZnFe 2 O 4 /ZnO nanocomposite prepared via two-step calcination method would be quite promising for the degradation of organic pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2023
·Vol. 37
·期 4
·e7006
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IF 3.9
Xiaoxi Li,Jiajia Li,Dilnur Kurbanjan,Tianhao Yu,Hong Du
Oxygen evolution reaction (OER), as a multi-step coupled anode reaction, is more sluggish in kinetics than electrocatalytic hydrogen evolution reaction (HER). In order to overcome the potential barrier in OER, it is necessary to develop high-efficient non-noble metal catalysts for energy utilization. In this work, several NiCo-ZIF materials with different molar ratios of Ni and Co were prepared by doping Ni 2+ in the preparation of ZIF-67 via a simple room temperature stirring method. After that, NiCo-ZIF was calcined at 350°C in a muffle furnace to obtain corresponding Ni-doped Co 3 O 4 (Ni-Co 3 O 4 ). Ni-Co 3 O 4 catalyst exhibits a low overpotential (η ≈ 203 mV @10 mA cm −2 ), a small Tafel slope (111.0 mV dec −1 ) and prominent stability for OER in 1 M KOH solution, which is higher than for a commercially available Ir/C electrocatalyst (η ≈ 350 mV @10 mA cm −2 ). The higher electrochemical performance should be largely ascribed to the introduction of oxygen vacancies resulting from the Ni doping, which leads to the improved electrochemical active surface area (122.81 mF cm −2 ) and the topological structure of the dodecahedron, which is in favor of the good contact area between the catalyst and the electrolyte. The design and synthesis of ZIF-derived catalyst in this work create a significative method to prepare efficient OER electrocatalysts.
研究领域:
材料科学
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电化学
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能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·21110-21119
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IF 9.931
Qiaoqiao Mu,Wei Zhu,Gangbin Yan,Yuebin Lian,Yuanzhou Yao,Qin Li,Yuyu Tian,Peng Zhang,Zhao Deng,Yang Peng
The development of efficient and economical catalysts for photocatalytic reduction of CO2 into chemical feedstocks is highly desirable for addressing both the global energy crisis and carbon emission problem. Herein, a series of carbonized cobalt composites derived from bimetallic Zn/Co zeolitic imidazolate frameworks (C-BMZIFs) are synthesized and used as the co-catalysts for [Ru(bpy)3]2+ mediated photocatalytic CO2 reduction under visible light irradiation. Varying the Zn/Co ratio allows regulation of the size of Co active sites, which further differentiates their catalytic activity towards CO2 reduction and H2 evolution, resulting in tunable CO/H2 ratio in the produced syngas. Among all investigated configurations, the C-BMZIF with a Zn/Co ratio of 3 : 1 demonstrates the highest CO yield of 1.1 × 104 μmol g−1 h−1, owing to the optimal balance between the quantity of active sites and the activity of each individual site. Consequently, this work provides insight into the design of stable MOF-derived co-catalysts for efficient photo-reduction of CO2, and offers an alternative solution for photocatalytic syngas production with tunable CO/H2 ratio.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Nano Today
·
2024
·
IF 13.2
Zhihao Lin,Guangyang Liu,Bin Sheng,Yiming Zhao,Dan Xu,Zhijian Wu,Jie Zhou,Meng Zhang,Ge Chen,Jing Wang,Jun Lv,Huan Lin,Donghui Xu
Nanoplastics, as a novel pollutant, are widely found in the environment and water, which also can be migrated to vegetables and fruits through irrigation water and the growing process, posing threat to the human health. In this study, post-modification strategy was implemented to synthesize a series of fine-tuning hierarchically porous ZIF-derived nanoframework (Zn-Co-Ni-ZIF, Zn-Co-TA-ZIF and ZIF67-Ni-ZIF) with various morphologies and structures to investigate the relationship between the polystyrene nanoplastics (PS-NPs) adsorption performance and structure property. The correlation degree between PS-NPs adsorption property and structure parameter followed the order of the intensity of Co2p > the intensity of M-N > the number of linker deficiencies > crystal defect > zeta potential. The gray models (GM) (1,1) between adsorption capacity and evaluation items were successfully established (C < 0.342; RSD < 18.108 %) but zeta potential. A highly linked association (R 2 = 0.9561) between the PV meso /PV micro and equilibrium constants k t 2 may be discovered. The combined findings from experimental analysis and Density Functional Theory calculations demonstrated that the adsorption capacity of adsorbents for PS-NPs was greatly enhanced by the introduction of additional defects and the reinforcement of adsorbent-adsorbate interactions, including electrostatic and coordination interactions. Among the selected materials, Zn-Co-ZIF and Zn-Co-Ni-(60 mg)-ZIF exhibited better resistance to acid, alkali, and salt. Moreover, the PS-NPs removal efficiency of Zn-Co-ZIF and Zn-Co-Ni(60 mg)-ZIF were > 83.55 % and > 87.80 %, respectively, in irrigation water, watermelon, strawberry, and carrot, meeting the environmental and food safety. Therefore, this work provides valuable insights into the modification of MOFs to improve the elimination of micropollutants in water, fruit, vegetable, as well as a comprehensive comprehension of the correlations between structure and performance.
研究领域:
环境科学
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材料科学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hao Guo,Yu Liu,Henglong Ren,Yanrui Hao,Liping Peng,Wu Yang
Metal-organic framework (MOF) materials, as electrodes for supercapacitors, have promising applications, but their conductivity and capacitance performance are critical limitations to their practical use. By constructing rational structures and incorporating various active materials, the conductivity and capacitance performance of MOF-derived materials can be significantly enhanced. This study presented the application of trimetallic selenide electrode materials V a -ZnSe/NiCoSe 2 in supercapacitors prepared through sequential Ni 2 + etching, selenization and NaBH 4 reduction of ZIF-8@ZIF-67 core-shell structure. The results exhibited that an appropriate number of Se vacancy defects effectively enhanced the specific capacitance and conductivity of the material, thereby improving the performance of supercapacitors. When NaBH 4 concentration was 1 M, the obtained V 1 -ZnSe/NiCoSe 2 electrode material presented excellent supercapacitor performance with a maximum specific capacitance (capacity) of 1563 F·g −1 (705.5 C . g −1 ) at a current density of 1 A·g −1 as well as high rate capability and long-term cycling stability. Additionally, the assembled V 1 -ZnSe/NiCoSe 2 //AC asymmetric supercapacitor delivered a high energy density of 41.9 Wh·kg −1 at a power density of 750 W·kg −1 , highlighting its great potential in the field of energy storage.
研究领域:
材料科学
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电化学
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储能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xueyun Han,Siyu Zhang,Lei Qiao,Peidong Peng,Chenghao Fu,Ke Liu,Zhongjun Ma
Metal–organic framework (MOF)-derived materials have gained popularity as microwave absorbing materials due to their electromagnetic dissipation advantages. In this study, a special type of MOF (ZIF-L) was used as a precursor; tannic acid was introduced for chemical etching. The resulting material obtained by in situ carbonization was a hollow structure of N-doped carbon embedded by Co nanoparticles (CoHNC), which retained the original pumpkin seed shape but had a hierarchical porous structure on the inside. By adjustment of the amount of cobalt nitrate and the carbonation temperature, the electromagnetic parameters could be altered, improving impedance matching and enabling different microwave absorption properties to be obtained. At 16.96 GHz, the material exhibits an optimal reflection loss of −45.5 dB, an effective bandwidth of 3.04 GHz, and a matching thickness of only 1.4 mm with a material filler of 30 wt %. The microwave loss mechanism is formed by the dual loss mechanism with dielectric loss as the main loss and magnetic loss as the auxiliary one. Therefore, the synthesis of the CoHNC composite through simple etching provides a useful idea for optimizing microwave absorbing materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Tianyu Wu,Xianhua Huan,Xiaolong Jia,Gang Sui,Lingyun Wu,Qing Cai,Xiaoping Yang
Through in-situ synthesis and thermal annealing, ZIF-derived nanoarrays were introduced to the surface of carbon fibers. The resulting modified carbon fibers (CoNC@CF) with the hierarchical nanostructure showed excellent electromagnetic wave (EMW) absorption capabilities, and were applied to 3D printing technology with polylactic acid (PLA) as the matrix. The CoNC@CF-PLA composites exhibited favorable 3D printability in comprehensive analysis, permitting the nanocomposite to be formed into complex structure as model designed. With the conduction loss , interface and dipole polarization and magnetic loss provided by CoNC@CF, the nanocomposites containing 10 wt% CoNC@CF displayed superior electromagnetic wave absorption capability. The minimum reflection loss value reached −45.5 dB at 11.5 GHz with a thickness of 2.9 mm. The introduction of CoNC@CF enhanced the mechanical properties of 3D printing PLA parts. After 30 s of microwave processing, the tensile strength of 3D printing PLA nanocomposites can be further enhanced. The CoNC@CF simultaneously improved the microwave absorption and mechanical properties of 3D printing nanocomposites parts. Thus, it provided a new efficient approach for preparation of structure-designable nanocomposites with integration of desired mechanical and electromagnetic wave absorption properties through 3D printing technology.
研究领域:
材料科学
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电磁学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Hongmei Dai,Yue Xu,Yongchao Han,Shixiong Sun,Xiaolin Zhang,Fangyu Xiong,Chao Huang,Chun Fang,Jiantao Han,Paul K. Chu
Superior specific capacity, high-rate capability, and long-term cycling stability are essential to anode materials in sodium-ion batteries, and conductive metal–organic frameworks (cMOF) with good electronic and ionic conductivity may satisfy these requirements. Herein, conductive neodymium cMOF (Nd-cMOF) produced in situ on the zeolitic imidazolate framework (ZIF)-derived carbon fiber (ZIF-CFs) platform is used to synthesize the Nd-cMOF/ZIF-CFs hierarchical structure. Four types of ZIFs with different pore diameters are prepared by electrospinning. In this novel structure, ZIF-CFs provide the electroconductivity, flexible porous structure, and mechanical stability, while Nd-cMOF provides the interfacial kinetic activity, electroconductivity, ample space, and volume buffer, consequently giving rise to robust structural integrity and excellent conductivity. The sodium-ion battery composed of the Nd-cMOF/ZIF-10-CFs anode has outstanding stability and electrochemical properties, such as a specific capacity of 480.5 mAh g–1 at 0.05 A g–1 as well as capacity retention of 84% after 500 cycles.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2014
·
IF 6.16
Shan Zhong,Chuanxing Zhan,Dapeng Cao
A series of nitrogen-doped porous carbons are prepared from nitrogen-containing zeolitic imidazolate framework (ZIF) and additional carbon sources (including melamin, urea, xylitol and sucrose) via co-carbonization at T = 950 °C. Results indicate that macromolecular carbon sources, say, sucrose, can effectively protect the nitrogen loss from ZIF backbone owing to the pre-melting and polymerization of the sucrose adsorbed on the ZIF surface in the carbonization process , which makes the corresponding ZIF-derived porous Carbon-ZS have high nitrogen content and excellent capacitive performance. The specific capacitance of Carbon-ZS in 6 M KOH solution reaches 285.8 F g −1 at a current density of 0.1 A g −1 owing to its relatively high nitrogen content and proper hierarchical pore structure . In particular, the capacitance of Carbon-ZS is higher than previously reported IRMOF-derived carbon, ZIF-67-derived carbon and ZIF-8/furfuryl alcohol co-derived carbon. Besides high capacitance, moreover, Carbon-ZS also shows excellent cycling stability and good electric conductivity as electrode materials for electric double-layer capacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 35
·18296-18304
·
IF 6.895
Yafei Fan,Shangjing Li,Ying Wang,Changfu Zhuang,Xiaoteng Liu,Guangshan Zhu,Xiaoqin Zou
Cu, Co and Zn modified N-doped porous carbons (CuCo/Zn@NPC) are prepared using a polymetallic homogeneous doping and self-templating method as high performance non-noble metal catalysts for the hydrogenation of furfural (FF) to furfuryl alcohol (FAL). The CuCo/Zn@NPC-600 catalyst after treatment at 600 °C shows a superior catalytic activity with nearly 100% conversion of FF and an almost 100% selectivity of FAL using H2 at 140 °C. Meanwhile in the catalytic transfer hydrogenation (CTH) using 2-propanol as a H-donor, the conversion of FF reaches 95.8% and the selectivity of FAL is 99.1%. The results show that the Zn dopant leads to 37.3 times higher yield on the CuCo/Zn@NPC-600 catalyst than that on CuCo@NPC-600, and 2.3 times higher than that on Co/Zn@NPC-600 with Cu dopants. The efficient activity of the CuCo/Zn@NPC-600 catalyst is mainly due to the highly dispersed metal nanoparticles, the advanced porous structure resulting from Zn escape from the precursor template, and the synergistic effect between Cu and Co. Furthermore, the CuCo/Zn@NPC-600 catalyst exhibits good recyclability in FF hydrogenation in four cycle tests. The advanced synthesis method using a homogeneous doping and self-templating strategy sheds light on preparing effective catalysts for hydrogenation of biomass-based compounds.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2019
·
IF 3.517
Jianhua Yu,Zhenxing Cui,Xu Li,Di Chen,Jiawen Ji,Qian Zhang,Jing Sui,Liyan Yu,Lifeng Dong
Recently, rational design and synthesis of two-dimensional (2D) nanoflake based architectures have attracted great attention in energy storage systems due to their unique properties, such as high specific surface area, superior electrical and thermal conductivity. Zeolitic imidazolate frameworks (ZIFs) with 2D structure can be synthesized by a facile aqueous method and be used to obtain 2D metallic/binary metallic oxides. In this paper, graphene oxide and Zn 2+ were added in the synthesis of Co-ZIF, and its derived oxide (ZnCoO-G) exhibits 2D nanosheet structure with well dispersed Co 3 O 4 and ZnO nanoparticles after heat treatment. Compared with the derivatives without graphene oxide (ZnCoO) and Zn 2+ (CoO-G), ZnCoO-G demonstrates the highest specific capacitance of 711.6 F g −1 at 1 A g −1 with a capacitance retention of 63.6% at 5 A g −1 after 1000 cycles. Also, an asymmetric supercapacitor (ASC) with ZnCoO-G and commercial active carbon as positive and negative electrodes has a maximum energy density of 18.7 W h kg −1 at a power density of 800 W kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qiang Liu,Zizi Zhang,Xiang Zhang,Junling Chen,Hongwu Ma,Leizhi Zheng,Keliang Wu,Yanlong Tai
The capture and conversion of CO 2 are crucial for achieving carbon reduction targets. Currently, porous carbon is regarded as the most promising material for CO 2 capture, but it is limited by the lack of effective catalytic conversion functional sites. Frustrated Lewis Pairs (FLPs) are considered the most promising metal-free catalysts for CO 2 conversion, but homogeneous catalytic systems fall short of meeting industrial demands. To address this, this paper selected zeolitic imidazolate frameworks (ZIF-8 and ZIF-67) derived N-doped porous carbon (ZIF-8-C and ZIF-67-C) as Lewis base and subsequently introduces B(C 6 F 5 ) 3 to construct B/N-based FLPs, namely ZIF-8-C-FLPs and ZIF-67-C-FLPs. This approach aimed to simultaneously enhance the catalytic conversion ability of porous carbon towards CO 2 and the heterogenization of FLPs. These ZIF-8-C-FLPs and ZIF-67-C-FLPs exhibited exceptional CO 2 capture capacity, with CO 2 adsorption capacities of 57.4 and 41.2 cm 3 /g at 273.15 K and 1 bar, respectively. Additionally, ZIF-8-C-FLPs and ZIF-67-C-FLPs were utilized to catalyze the preparation of benzimidazole and benzoxazole from o-phenylenediamine and o-aminophenol with CO 2 , demonstrating excellent catalytic performance (yields above 86 %) and recyclability (at least 8 cycles).
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 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）