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Facile synthesis of samarium and cerium doped double perovskite cobaltite with enhanced dielectric response

Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： yasir abbas M.Kamran M.Anis-ur-Rehman Applied Thermal Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm-Ce doping on structure,conduction,and dielectric response of Bi_(2)Ca_(2-2x)Sm_(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specimens were synthesized by a facile synthesis technique named the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice parameters,lattice strain,unit cell volume,and bulk density were determined using XRD *** structural properties of Bi_(2)Ca_(2)CoO_(6)were examined using calculations based on the density functional *** and experimental values discrepancy is less than 1%.A scanning electron microscope was used for performing a microstructural *** SEM images demonstrate the homogeneous distribution of grains with a range of sizes(0.054-0.090μm).The alternating current(ac)conductivity,dielectric permittivity,and tangent loss were also studied as a function of frequency(20 Hz-3 MHz)at different temperatures(100-500℃).All synthesized samples were examined using non-linear Debye's function to determine their spreading factor and relaxation *** specimen with the lowest crystallite size(∼23 nm)exhibits a high dielectric permittivity(∼3.80×10^(6)).The conduction mechanism was examined in the studied samples with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 compositions follow non-overlapping polaron *** studied specimen Bi_(2)Ca_(1.9)0Sm_(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm^(3))displays a high electrical conductivity(∼46.1 S/cm).These findings correspond to those published for ceramics made from calcium cobaltite using solid-state reactions(5.0-26.0 S/cm).

关键词： Bismuth calcium samarium cerium cobaltite (BCSCCO) Spreading factor Conduction mechanism Rare earths

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Inferior glenohumeral joint dislocation with greater tuberosity avulsion

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Chinese Journal of Traumatology 2015年第3期18卷 181-183页

作者： Mohd Faizan Latif Zafar Jilani Mazhar abbas yasir Salam Siddiqui Aamir Bin Sabir M.K.A. Sherwani Saifullah Khalid Department of Orthopaedic Surgery and Radiodiagnosis Jawaharlal Nehru Medical College Aligarh Muslim University Aligarh Uttar Pradesh 202002 India

Inferior glenohumeral dislocation is the least common type of glenohumeral dislocations. It may be associated with fractures of the adjacent bones and neurovascular compromise. It should be treated immediately by close reduction. The associated neuropraxia usually recovers with time. Traction-counter traction method is commonly used for reduction followed by immobilization of the shoulder for three weeks. Here, we report a case of inferior glenohumeral joint dislocation with greater tuberosity fracture with transient neurovascular compromise and present a brief review of the literature.

关键词： Shoulderjoint Shoulder dislocation Fractures bone

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Acorn shell-derived porous bio-based carbon for high-performance dye-sensitized solar cells and supercapacitors

Acorn shell-derived porous bio-based carbon for high-perform...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者：王子齐 Chen Wang Yangliang Zhang Yiming Si Feng Han yasir abbas Asim Arshad 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Dye-sensitized solar cells(DSSCs) have attracted great attention in the field of renewable energy. The counter electrode(CE) plays a crucial role in high-performance DSSCs. It is significant to develop progressive CE materials with considerable electrocatalytic activity. To improve the charge storage capacity of supercapacitors(SCs),using porous carbon materials as working electrodes is an effective technical strategy. In the present work, an acorn shell-derived porous bio-based carbon(AS-BC) with a high specific surface area(1312 m g) is controllably prepared by combining simple hydrothermal carbonization with chemical activation. The AS-BC as a CE for DSSCs reveals superior electrocatalytic activity for the reduction of I and a high power conversion efficiency(PCE) of 6.00%, matching the PCE of the DSSC with Pt CE(6.7%).As a working electrode for SCs, the AS-BC electrode reveals a remarkable specific capacitance of 234 F g at 0.5 A g in a three-electrode system with excellent rate performance(79.91% capacitance retention after current density magnifies from 0.5 to 5 A g). This work provides an efficient strategy for fabricating morphology-controllable porous bio-based carbon with high specific surface area(1312 m g) that exhibits significant potential for new energy devices.

关键词： Porous bio-based carbon acorn shell electrodes dye-sensitized solar cells supercapacitors

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Tantalum-based bimetallic oxide deposited on bio-carbon as counter electrode catalysts for dye-sensitized solar cells

Tantalum-based bimetallic oxide deposited on bio-carbon as c...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者：乔昕莹 Jingwen Li Feng Han Yiming Si Yangliang Zhang yasir abbas Asim Arshad 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Dye-sensitized solar cells are one of the most efficient devices for developing and utilizing solar energy, research on DSSCs will help decrease current energy crisis and environmental pollution problems. Counter electrode is an important part of DSSCs, the development of potentially effective alternatives to Pt-free materials has attracted widespread attention. Transition metal oxide have the electronic structure similar to Pt,which also shows excellent catalytic performance in DSSCs as counter electrode catalysts materials. Carbon materials have low cost, high electrochemical catalytic activity, and corrosion resistance. Our previous work has shown that there is a synergistic effect between transition metal oxides and carbon materials. It is found that the MnTaO and MnTaO/BC show excellent electrocatalytic activity and high PCE of 3.66% and 7.25% respectively. surpassing that of DSSC with Pt counter electrode(6.70%). indicating the excellent catalytic activity for the reduction of triiodide to iodide.

关键词： Dye-sensitized solar cell Counter electrode Catalysts Tantalum-based bimetal oxide

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Bio-based carbon supported molybdenum-based oxides as counter electrode for dye-sensitized solar cells

Bio-based carbon supported molybdenum-based oxides as counte...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者：韩凤 Chen Wang Yiming Si Yangliang Zhang Jingwen Li Xinying Qiao Yongwei Zhang Asim Arshad yasir abbas 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Counter electrodes(CE), one of the vital components in dye-sensitized solar cells(DSSCs), play a role in catalyzing the reduction of I to I and collecting the electrons from external circuit. Platinum(Pt) is widely used as CE material in DSSC, but the high cost,scarcity, and easy erosion by I/I electrolyte limit its commercialization. In this regard,transition metal oxides(TMOs) can be used as alternative CE materials due to their similar electronic structure with Pt. In this work, bio-based carbon supported Mo-based oxide composite(ZnMoO/bio-based carbon(BC)) is prepared successfully via a facile co-precipitation route and is used as CE materials in DSSCs. The power conversion efficiency of DSSCs based on the ZnMoO and ZnMoO/BC CE is 2.63% and 6.83%,respectively, indicating that bio-based carbon effectively improves the catalytic activity of the Mo-based oxides. This work provides a facile and effective strategy for preparing alternative Pt CE materials with superior performance for energy conversion devices.

关键词： Dye-sensitized solar cell Counter electrode Co-precipitation Molybdenum-based oxides Bio-based carbon

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Dual functional application of pomelo peel-derived bio-based carbon with controllable morphologies: An efficient catalyst for triiodide reduction and accelerant for anaerobic digestion

Dual functional application of pomelo peel-derived bio-based...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者：王晨 Hongfei Xu Ziqi Wang Feng Han Yangliang Zhang Yiming Si Xinying Qiao Jingwen Li yasir abbas Asim Arshad 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Exploring the new generation clean-renewable and high-performance energy conversion materials for dye-sensitized solar cell(DSSC) and anaerobic digestion(AD) is an effective approach to ease the energy demands and environmental ***-derived carbon materials have attracted much attention in DSSC and AD due to their excellent electrical conductivity, high specific surface area, excellent catalytic activity,and wide avaliability. Pomelo peel-derived bio-based carbon with controllable morphologies are successfully prepared via three different methods(microwave pyrolysis,two-step activation, hydrothermal carbonization combing chemical activation). The difference in specific surface area and pore size distribution caused by various morphology features have remarkably affected the application potential of as-prepared bio-based *** bio-based carbon prepared via two-step activation method as counter electrode catalyst in DSSC obtains an excellent photovoltaic performance as compared with the Pt-based DSSC(6.94% vs. 6.71%). Furthermore, the as-prepared bio-based carbon is used as accelerant in AD system and obtains the enhanced cumulative biogas production(525 mL/g VS) and COD removal rate(70.95%) as compared to the control check group(296 mL/g VS, 29.55%). This work illustrates three promising methods to prepare bio-based carbon with controllable morphologies and superior surface area to realize their multi-function resource utilization in renewable energy fields.

关键词： Bio-based carbon Counter electrode Dye-sensitized solar cell Accelerant Anaerobic digestion

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Bio-based carbon supported flower-like CoWO4 as counter electrode catalysts in dye-sensitized solar cells

Bio-based carbon supported flower-like CoWO4 as counter elec...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者：张阳亮 Chen Wang Ziqi Wang Hongfei Xu Yiming Si Feng Han Jingwen Li Xinying Qiao yasir abbas Asim Arshad 云斯宁西安建筑科技大学材料与矿资学院功能材料研究所西安建筑科技大学材料科学与工程学院功能材料研究所

Counter electrode(CE) is an important component of dye-sensitized solar cells(DSSCs), which collect electrons from the external circuit and reduce I ions in the electrolyte. Pt is preferred CE materials in DSSCs, but the cost and scarcity of Pt have limited its broad application. In this regard, we synthesized a series of tungsten(W)-based bimetal oxides, then bio-based carbon(BC) were introduced to fabricate composites and used as CE materials in DSSCs assembled with I/I redox shuttle. In the hydrothermal system, BC worked as a structure-directing agent to direct the self-assembly of CoWO nano-flowers. As CE for DSSC CoWO/BC exhibit enhanced electrocatalytic activity and reduced charge-transfer resistance because of the synergistic effects of catalytic tungsten-based bimetal oxides and conductive bio-based carbon. The power conversion efficiency of DSSC with CoWO/BC CE is 6.07%, comparable to that of the Pt-based DSSC(6.46%). This indicates that the introduction of bio-based carbon is an excellent strategy to improve electrical conductivity of W-based bimetal oxides.

关键词： Dye-sensitized solar cell Counter electrode Catalysts Tungsten-based bimetal oxide Bio-based carbon

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Integrated Approach to Improve Electrocatalytic Activity of Tantalum Derivatives as Counter Electrode in Dye-sensitized Solar Cells

Integrated Approach to Improve Electrocatalytic Activity of ...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者：党姣娥 Feng Han Yongwei Zhang Yiming Si yasir abbas Asim Arshad Chen Wang Yangliang Zhang Ziqi Wang Jingwen Li Xinying Qiao 云斯宁西安建筑科技大学材料与矿资学院功能材料研究所西安建筑科技大学材料科学与工程学院功能材料研究所

The counter electrode(CE) is a crucial part in dye-sensitized solar cells(DSCs) to catalyze redox couple. Tantalum used as CE has been investigated to strengthen the catalytic activity in DSCs due to the similar electronic structure with Pt. This work designs and fabricates tantalum-based compounds(TaO, TaON, TaN, TaC,TaC/MC) as highly efficient, cost-effective and earth abundant CE for DSCs toward the I/I redox couples. TaON and TaN are fabricated by nitridation of TaO in NH atmosphere then compared with commercial TaC. Furthermore, TaC/MC are synthesized via the soft-template method to further improve the catalytic performance of TaC. The DSCs with TaON CE get the power conversion efficiency(PCE) of 5.46%, surpass the DSCs with TaO(5.20%) and TaN(5.03%) CE. TaC/MC utilized as CE in DSC obtains higher PCE(6.77%) compared with TaC(6.24%), MC(6.52%) and Pt(6.34%) as CEs in DSCs. This work provides effective and generally applicable methods to synthesis early-transition-metals-based compounds as potential CE catalysts, which can help to reduce the cost and enhance the catalytic performance.

关键词： tantalum counter electrode dye-sensitized solar cells nitridation soft-template method

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Mesoporous bio-based carbon supported tungsten carbide as high performance counter electrode catalysts for dye-sensitized solar cells

Mesoporous bio-based carbon supported tungsten carbide as hi...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者：张永伟 Yiming Si Feng Han Jingwen Li Xinying Qiao Jiaoe Dang Chen Wang Ziqi Wang Yangliang Zhang Asim Arshad yasir abbas Sining Yun 西安建筑科技大学材料科学与工程学院功能材料研究所

In dye-sensitized solar cell(DSSC) device, the counter electrode(CE) is an indispensable component and plays an important role in collecting electrons from external circuit and catalyzing the reduction of I to I. Platinum(Pt) is the preferred CE materials in DSSCs due to its excellent electrocatalytic activity. However, the high cost and scarcity of Pt CE limited its large-scale commercial application. In this work, bio-based carbons derived from waste carton are prepared via two methods. The obtained carbons used as CE catalysts in DSSCs resulted in power conversion efficiency(PCE) of 6.76% and 6.19%,respectively. Moreover, the composite catalysts with high catalytic activity are prepared by introducing tungsten carbide(WC) into bio-based carbon and used as CEs in DSSCs,which show superior PCE values of 6.85% and 7.32%, respectively, close to that of the Pt-based DSSC(7.51%). This work provides an effective strategy for preparing low-cost and high-performance bio-based carbon to achieve the resource utilization of biomass waste in new energy fields.

关键词： Dye-sensitized solar cell Bio-based carbon Tungsten carbide Electrocatalyst

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Layer-stacking bio-based carbon derived from sunflower stalk as counter electrode for Dye-sensitized solar cell and supercapacitors

Layer-stacking bio-based carbon derived from sunflower stalk...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： yasir abbas Xiaodong Wang Asim Arshad Yongwei Zhang Jiaoe Dang Chen Wang Ziqi Wang Yangliang Zhang Feng Han Yiming Si Jingwen Li Xinying Qiao 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Biomass-derived carbon materials have attracted much attention in dye-sensitized solar cell(DSSC) and high-performance supercapacitors owing to their low cost, good electrochemical performance and high conductivity. This study focuses on a simple and low cost method to synthesis highly porous bio-based carbon from sunflower stalk. This activated carbon was used as counter electrodes(CEs) for DSSC and electrode materials for supercapacitors. In terms of DSSC, bio-based carbon as CEs show excellent electrocatalytic activity for the reduction of I to I in the *** charge transfers resistance, fill factor, and power conversion efficiency of DSSC based on the bio-based carbon CE material is 7.85 ?, 0.64, and 6.56%, respectively. An effective and high-performance CE material, bio-based carbon derived from sunflower stalk, has been achieved in DSSCs. For supercapacitors, an outstanding capacitance retention rate and a good stability are realized by using this as-prepared bio-based carbon as electrode materials.

关键词： Bio-based activated carbon Dye-sensitized solar cell Supercapacitors Hydrothermal carbonization Sunflower stalk waste

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