SOLAR ENERGY
·
2021
·
IF 5.742
Abdelaal S.A. Ahmed,Wanchun Xiang,Fatma S.M. Hashem,Xiujian Zhao
Platinum (Pt)-based counter electrodes (CEs) are promising electrocatalysts for dye-sensitized solar cells (DSSCs). However, replacing the expensive Pt with low-cost materials and comparable catalytic activity still a big challenge. Here, we prepared CB-SiO 2 composites by blending various weights of SiO 2 (1, 3, and 5 wt%) with carbon black (CB), followed by screen printed onto the FTO substrate to utilized as CEs for DSSCs. In comparison with pure CB, CB-SiO 2 composite CEs showed higher transferability and higher electrocatalytic activity toward I 3 - / I - redox couple. Among all, CB-SiO 2 -1% composite CE with 4 µm showed the best catalytic performance, and the related DSSC showed a power conversion efficiency of 6.38%. Increasing the CE thickness significantly enhances the catalytic ability and the total performance of the assembled devices, whereas the power conversion efficiency of the DSSC with CB-SiO 2 -1% composite CE in 8 µm thick was 7.99%, which is close to that achieved by Pt-based device under the same conditions.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 58
·14478-14488
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IF 5.236
Fan Yang,Hao Guo,Yuan Chen,Mengni Xu,Wenhu Yang,Mingyue Wang,Meng Yang,Junye Zhang,Lei Sun,Tingting Zhang,Wu Yang
Graphical Nanoflower structural MnCo 2 O 4 /Ni-MOF composite prepared by in situ growth of Ni-MOF on the surface of MnCo 2 O 4 nanorods derived from Co/Mn-MOF at 600 °C has a high cycling stability and outstanding rate performance as supercapacitor electrode material. MnCo 2 O 4 is derived from a Co/Mn bimetallic metal-organic framework (MOF). Then Ni-MOF is directly grown on the surface of the obtained MnCo 2 O 4 to form a nano-flower structure with small balls. A large surface area, abundant active sites of MnCo 2 O 4 and porosity of Ni-MOF allow the prepared MnCo 2 O 4 /Ni-MOF composite material to deliver an excellent electrochemical performance. At the same time, an appropriate thermal treatment temperature of the MnCo 2 O 4 precursor is also very important for controlling the morphology of the obtained MnCo 2 O 4 and electrochemical performances of the resulted composite material including electric conductivity, specific capacitance and rate performance. The prepared MnCo 2 O 4 -600/Ni-MOF shows an ultrahigh rate performance (when the current density increases from 1 to 10 A g −1 , the capacitance retention rate is as high as 93.41 %) and good cycle stability (the assembled asymmetric supercapacitor advice delivers a capacitance retention rate of 94.74 % after 20 000 charge and discharge cycles) as well as a relatively high specific capacitance. These excellent electrochemical properties indicate that MnCo 2 O 4 /Ni-MOF has a good application prospect in the market.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
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IF 4.821
Wenhu Yang,Hao Guo,Rui Xue,Xin Zhao,Qixia Guan,Tian Fan,Longwen Zhang,Fan Yang,Wu Yang
Selenides derived from MOFs have attracted attention as the materials with excellent electrochemical properties. CNT/MOF-74 composites are successfully synthesized by a simple hydrothermal method. Then CNT/Ni-MOF-74 materials are selected as the precursors for further selenization to prepare CNT/NiSe x . The results show that 0.2CNT/NiSe x derived from CNT/Ni-MOF-74 prepared in the presence of 0.2 g CNTs has the best electrochemical performance as electrochemical capacitor electrode, which exhibits the highest specific capacitance of 2136 F·g −1 at a current density of 1 A·g −1 . In addition, a hybrid electrochemical capacitor (HEC) is assembled with 0.2CNT/NiSe x and activated carbon (AC). The obtained 0.2CNT/NiSe x //AC HEC shows a high energy density of 59 Wh·kg −1 at a power density of 800 W·kg −1 . In order to expand the application of the composition material, a 0.2CNT/NiSe x /GCE electrochemical sensor is prepared. The results show that 0.2CNT/NiSe x /GCE electrochemical sensor can be used for simultaneous determination of acetaminophen (AMP) and dopamine (DA).
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 21
·12853-12869
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IF 12.732
Tahereh Sadeghian Renani,Seyyed Mehdi Khoshfetrat,Jalal Arjomandi,Hu Shi,Sadegh Khazalpour
Great efforts have been made to design and fabricate low-cost, high efficiency advanced electrode materials for energy storage devices such as batteries and high-performance supercapacitors. Choosing organic and redox active species that increase the faradaic charge storage of electrode systems has thus become a challenge to increase energy density and conductivity. To this aim, herein, azure A/3D graphene aerogel (Az–GA), and trypan (Try) blue–nickel metal–organic framework (Try–Ni-MOF) nanosheet array redox active electrodes are fabricated via a hydrothermal method and used in an asymmetric supercapattery. Az links to 3D GA via π–π interactions to form an anode. A nickel chloride hexahydrate array combines with Try as a MOF to form a cathode. These redox active materials increase the faradaic charge storage of the system. The as-prepared asymmetric device shows a high specific capacitance of 319 F g−1 at 1 A g−1, a specific energy of 66.55 W h kg−1, a specific power of up to 4.45 kW kg−1, and a higher capacity retention of 92.12% after 5000 charge–discharge cycles at 10 A g−1. This device exhibits a broad potential window of 1.60 V and represents a promising strategy toward safe and sustainable energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Guodong Zhang,Runcheng Zhang,Fei Wang
Although activated carbon (AC) can significantly enhance hydrate nucleation kinetics due to abundant specific surface area and pore texture, the promotion drastically degenerates under low driving force and large water contents. Taking exceptional heat transfer of silver into account, silver nanoparticles were immobilized on activated carbon by in situ reduction method, giving rise to silver nanoparticle coated activated carbon (Ag-NP@AC), and the performance of Ag-NP@AC on hydrate formation kinetics was evaluated. Hydrate nucleation loaded by activated carbon was governed by external nucleation and that in inner pores, so slow hydrate nucleation was observed under low driving force and large water contents, where inner nucleation is hindered, and 500.67 min is required to induce hydrate nucleation at low overpressure (Δ P = 2.1 MPa), while 1145.4 min is inevitable for large water content ( R w = 1.4). Encouragingly, the presence of Ag nanoparticles significantly improves this limitation by enhancing external nucleation, Ag-NP@AC shortens hydrate induction time to a large extent, which reduces by 96.88% and 85.25% under mild condition (Δ P = 2.1 MPa) and large water content ( R w = 1.4), respectively. These findings provide new perspective on the application of porous carbon materials on hydrate-based solidified natural gas technologies.
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IONICS
·
2021
·Vol. 27
·期 10
·4473-4482
·
IF 2.817
Huang Tianfu,Qiu Zehai,Hu Zhibiao,Zhang Zhusen
Efficient and low-cost electrode materials play a key role in improving the performance of energy storage device. In this study, the porous rod-like CuCo 2 O 4 nano-materials are synthesized by a simple hydrothermal method and subsequent heating annealing procedure. Benefiting from its advantages of the unique porous rod-like architectures with large specific surface area (98.27 m 2 g −1 ), the as-prepared CuCo 2 O 4 electrode displays a high specific capacitance of 778.29 F g −1 at 1 A g −1 , excellent rate capability (85.79% capacitance retention at 16 A g −1 ), and ultra-long cycling lifespan (91.65% specific capacitance retention after 4000 cycles) through the three-electrode system test. When assembled into the CuCo 2 O 4 //AC-ASC cell device, it provides a maximum energy density of 64.03 Wh/kg at a power density of 800.01 W/kg and extraordinary cycling stability (85.39% retention after 5000 cycles). These results firmly verify that the porous rod-like CuCo 2 O 4 nano-materials have great potential application for supercapacitors.
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RSC Advances
·
2021
·Vol. 11
·期 40
·24995-25003
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IF 3.361
Hao Guo,Longli Ma,Chaojing Yan,Xiaohua Ma
The polycation gel polymer electrolyte (PGPE) is a promising electrolyte material for supercapacitors due to its high ionic conductivity and great flexibility. Herein, we report a novel flexible PGPE film, which is prepared by thermal copolymerization. The superiority of PGPE is attributed to the existence of charged groups in the polymer skeleton. Consequently, the crystallinity of the polymer is effectively reduced, and the migration of the lithium ion is evidently promoted. Moreover, the liquid retention capacity of the film is improved, which enhances its ionic conductivity as well. The reported PGPE exhibits a high ionic conductivity of 57.6 mS cm−1 at 25 °C and a potential window of 0–1.2 V. The symmetrical PGPE supercapacitor (AC/AC) shows 95.21% mass-specific capacitance retention after 5000 cycles at 2 A g−1 with a maximum energy density of 12.8 W h kg−1 and a maximum power density of 5.475 kW kg−1. This study confirms the exciting potential of PGPE for high performance supercapacitors.
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PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2021
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IF 8.271
Weiyin Wang,Lu Lin,Haifeng Qi,Wenxiu Cao,Zhi Li,Shaohua Chen,Xiaoxuan Zou,Tiehong Chen,Nanfang Tang,Weiyu Song,Aiqin Wang,Wenhao Luo
The catalytic hydrogenation of halonitroarenes to haloanilines is a green and sustainable process for the production of key nitrogen-containing intermediates in fine chemical industry. Chemoselective hydrogenation poses a significant challenge, which requires the rational design of the catalysts with proper hydrogenation ability for nitro group and simultaneously preventing dehalogenation of halogen group. Herein, a highly effective Rh@Al 2 O 3 @C single-atom catalyst (SAC) was developed for the hydrogenation of m -chloronitrobenzene ( m -CNB) to m -chloroaniline ( m -CAN), through an in-situ grafting of metal during the assembly of MIL-53 (Al), followed by confined pyrolysis . Extensive characterizations reveal an exquisite structure of the Rh@Al 2 O 3 @C, containing atomically dispersed Rh sites onto Al 2 O 3 confined by the amorphous carbon. The five-coordinated aluminum (Al V ) species are essential for achieving the atomic dispersion of Rh atoms, providing the unsaturated coordinative sites for metal. Compared to the benchmark Rh/γ-Al 2 O 3 and Rh/C nanocatalysts, the Rh@Al 2 O 3 @C SAC affords an excellent turnover frequency of 2317 mol m -CNB ·mol Rh –1 ·h –1 , the highest value to date in heterogeneous catalyst systems for the hydrogenation of m -CNB at 313 K and 20 bar H 2 , together with a sustained selectivity to m -CAN (~98%) during five consecutive runs. The superior catalytic performance of the Rh@Al 2 O 3 @C is attributed to a proper modulation of electronic structure of hydrogenation metal by forming SAC, together with an enhanced accessibility of acid function sites.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Fang Xu,Qing Xia,Guoping Du,Zhaoyang Fan,Nan Chen
Transition metal phosphides (TMPs), used in hybrid supercapacitors (HSCs) as battery–type electrodes, have gain tractions for balancing the requirements for both power and energy; however, their poor structural integrity, inferior conductivity and low porosity restrict the achievable performance. Developing an elaborate material architecture for electrodes that endows mechanical robustness, superior conductivity and large surface area is a pressing need for TMPs to achieve boosted performance in supercapacitors. Here, we report a coral–like interconnected Ni 2 P nanoparticles dispersed on porous amorphous carbon matrix (Ni 2 P@C) as the electrode material with superior electrochemical performance. The Ni 2 P@C electrode exhibits a superior specific capacity of 3,631mC cm −2 at 1 mA cm −2 (979 C g −1 at 1 A g −1 ). Impressively, the assembly of Ni 2 P@C and active carbon (AC) electrodes result in an advanced HSC with energy density of 44.0 Wh kg −1 at 800 W kg −1 and cycling stability of 90.5% retention after 10,000 cycles, demonstrating this unique Ni 2 P@C structure is promising for developing practical HSC technology.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Yun Li,Haotian Xue,Pekka Taskinen,Ari Jokilaakso,Chaobo Tang,Wei Jin,Minna Rämä,Yongming Chen,Shenghai Yang
In view of the issues of low efficiency and environmental pollution existing in current antimony production, this work proposes an innovative and cleaner process to extract antimony from stibnite concentrate and co-treat goethite residues. The mechanisms of antimony extraction and zinc, iron, sulfur conservation was thermodynamically and experimentally investigated. The results show that iron- and zinc-bearing components in the goethite residue firstly reacted and releasing Fe x O y and ZnO, then stibnite (Sb 2 S 3 ) quickly converted to senarmontite (Sb 2 O 3 ) in the presence of Fe x O y and ZnO. Intermediate Sb 2 O 3 was subsequently reduced to metallic Sb. Bench-scale experiments of antimony extraction from stibnite concentrate with goethite residue as sulfur-fixing agent validated that 85.7% of Sb was directly recovered as crude antimony bullion, only around 7.4% antimony volatilized to fume. Pb, As, Au, and Ag tended to also be co-enriched in the bullion. 97.4% of sulfur, 88.8% of zinc and 86.1% of iron were recovered and fixed simultaneously. Sulfur in Sb 2 S 3 , iron and zinc contained in goethite residues was conserved in matte as marketable Fe 2 Zn 3 S 5 , FeS, and ZnS, instead of forming gaseous SO 2 . This novel process is a promising recycling and co-treatment alternative for various secondary iron- and zinc-containing materials.
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EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2021
·Vol. 123
·期 8
·2000385
·
IF 2.679
Jiaxin Chen,Xin Li,Baohua Kong,Jinglin Ma,Meiyue Liu,Chengguo Liu,Qian Liu
The present study proposes an efficient method to effectively strip tert -butylhydroquinone (TBHQ) from commercial soybean oils. Ethanol, a typically common and relatively safe organic solvent, can successfully strip TBHQ by employing a liquid-liquid extraction strategy. The results show that the volume ratio of ethanol to oil is a key factor for stripping efficiency (SE), and 4:1 (v/v) is considered the optimal parameter. When compared with traditional stripping methods via adsorbing materials (such as activated charcoal or alumina powder), the proposed ethanol extraction method can more effectively strip TBHQ from commercial oils with lower adsorption loss and higher SE. Moreover, the model O/W emulsion systems prepared using ethanol stripped oils showed the highest degree of lipid oxidation. The method can completely strip TBHQ from commercial soybean oils, thereby eliminating its influence on oxidative stabilities of model oil-in-water emulsions. Practical Applications : The ethanol stripping method can be applied as a pretreatment method to completely strip TBHQ from commercial soybean oils, and subsequently eliminate the influence of TBHQ on lipid oxidation in model O/W emulsion systems during storage.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2021
·
IF 3.407
Xiaoming Wang,Yifan Gao,Fangming Deng,Yineng Xiao,Hailiang Zhang,Yifeng Huang
This paper proposes a flexible curved sensor array (FCSA) for wind pressure monitoring on train bogies. The fabricated FCSA made of composite conductive materials integrates strain and pressure sensing modules. The preparation ratio and internal conductive structure of the sensor are optimized to improve its strain detection precision and sensitivity. The accuracy of wind pressure monitoring data reaches 97 %, which is higher than current sensors. Experimental results show that the composite with hybrid filler of 1.75 wt % carbon black (CB) exhibits highly strain sensitive characteristics of good linearity, high accuracy, excellent stretchability (>50 %), high gauge factor (GF ∼10.2) and excellent durability over 500 stretching-releasing cycles under 30N. The designed FCSA demonstrates the practicality and effectiveness for wind pressure detection of train bogie, and provides a potential option for structural health monitoring (SHM) under large deformation.
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高影响因子
危险品化学品经营许可证（带存储）