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SiO2 stabilizes electrochemically active nitrogen in few-layer carbon electrodes of extraordinary capacitance

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Journal of Energy Chemistry 2020年第10期29卷 179-188页

作者： Feng Xu Tianquan Lin Jian Huang I-Wei Chen Fuqiang Huang State Key Laboratory of High Performance Ceramics and Superfine Microstructure.Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences 19 Yuquan RoadBeijing 100049China Department of Materials Science and Engineering University of PennsylvaniaPhiladelphiaPA 19104USA College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Pyrrolic and pyridinic N dopants can dramatically increase the electrochemical activities of carbon and conducting *** N-doped conducting polymers suffer from rapid degradation,their carbon counterpart of extraordinary capacitance has remarkable rate performance and cycling endurance thanks to carbon’s excellent electrical *** high nitrogen content and high electrical conductivity are difficult to achieve in a high-surface-area carbon,because the high chemical vapor deposition(CVD)temperature required for obtaining high conductivity also destabilizes under-coordinated pyrrolic and pyridinic nitrogen and tends to lower the surface *** we resolve this dilemma by using SiO2 as an effective N-fixation additive,which stabilizes the N-rich nano few-layer sp2-carbon construct in1000℃*** enables a scalable sol-gel/CVD fabrication process for few-layer carbon electrodes of extraordinary capacitance(690 F g^-1).The electrodes have excellent rate performance and can maintain90%of their initial capacitance after 30,000 cycles,thus potentially suitable for practical applications.

关键词： Electrochemical capacitors carbon electrodes Extraordinary capacitance SiO2 stabilized nitrogen

Current status and trends of carbon-based electrodes for fully solution-processed perovskite solar cells

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Journal of Energy Chemistry 2022年第5期31卷 222-246页

作者： Laura MGonzález Daniel Ramirez Franklin Jaramillo Centro de Investigación Innovacióny Desarrollo de MaterialesCIDEMATFacultad de IngenieríaUniversidad de Antioquia UdeACalle 70 No.52-21Medellín 050010Colombia

Perovskite solar cells(PSCs) have revolutionized photovoltaic research. As a result, a certified power conversion efficiency(PCE) of 25.5% was recorded in late 2020. Although this efficiency is comparable with silicon solar cells;some issues remain partially unsolved, such as lead toxicity, instability of perovskite materials under continuous illumination, moisture and oxygen, and degradation of the metallic counter electrodes. As an alternative to tackle this last concern, carbon materials have been recently used, due to their good electrical and thermal conductivity, and chemical stability, which makes them one of the most promising materials to replace metallic counter electrodes in the fabrication of PSCs. This review highlights the recent advances of carbon-based PSCs, where the carbon electrode(CE) is the main *** have become very promising candidates for PSCs;they are mainly fabricated using a simple combination of graphite and carbon black powders embedded in a binder matrix, giving a paste that is then solution-processable, resulting in devices with improved quality stability, when compared to metallic electrodes. In this review, CE’s composition is emphasized, since it can give both, high and lowtemperature processed electrodes, compatible with different device configurations. Finally, the tendencies and opportunities to use CE in PSCs devices are presented.

关键词： Perovskite solar cells carbon electrodes Scaling up Stability Solution processing

Dimethylamine oxalate manipulating CsPbI_(3) perovskite film crystallization process for high efficiency carbon electrode based perovskite solar cells

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Journal of Energy Chemistry 2024年第6期93卷 221-228,I0006页

作者： Wenran Wang Xin Peng Jianxin Zhang Jiage Lin Rong Huang Guizhi Zhang Huishi Guo Zhenxiao Pan Xinhua Zhong Huashang Rao Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou 510642GuangdongChina College of Chemistry and Civil Engineering Shaoguan UniversityShaoguan 512005GuangdongChina Guangdong Provincial Key Laboratory of Utilization and Conservation of Food and Medicinal Resources in Northern Region Shaoguan UniversityShaoguan 512005GuangdongChina

Crystallization process determines the quality of perovskite films and the performances of resultant perovskite solar cells(PSCs).Dimethylamine oxalate has been proven as a multifunctional modulator,and is explored as an efficient additive in manipulating the crystallization process of CsPbI_(3) perovskite *** one hand,oxalate serves as the precipitator that facilitates the nucleation process of *** larger size of intermediate is conductive to the larger size and smaller grain boundaries of resultant *** the other hand,in subsequent annealing process,the phase conversion and growth process of transient perovskite can be decelerated due to the strong interactions of oxalate with both dimethylamine cation(DMA^(+))and Pb^(2+).Due to the optimized crystallization kinetics,the morphology and quality of CsPbI_(3) perovskite films are comprehensively improved with lower defect concentrations,and charge recombination loss is effectively *** from the optimized crystal quality of perovskite films,the carbon electrode-based CsPbI_(3) PSCs exhibit a champion efficiency of 18.48%.This represents one of the highest levels among all hole transport layer-free inorganic perovskite solar cells.

关键词： Solar cells Perovskite CsPbI_(3) carbon electrodes Oxalate

Effect of structural variation in biomass-derived nonfluorinated ionic liquids electrolytes on the performance of supercapacitors

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Journal of Energy Chemistry 2022年第6期31卷 174-184,I0005页

作者： Inayat Ali Khan Yong-Lei Wang Faiz Ullah Shah Chemistry of Interfaces.Lulea University of Technology.SE-97187 Luled Sweden Department of Materials and Environmental Chemistry.Arrhenius Laboratory.Stockholm University.SE-10691Stockholm.Sweden

There is a growing interest in sustainable and high performance supercapacitors(SCs) operating at elevated temperatures as they are highly demanded in heat-durable electronics. Here, we present a biomass-derived nonfluorinated ionic liquid(IL) [P_(4444)][HFuA] and its structural analogue [P_(4444)][TpA]as electrolytes for supercapacitors comprising multiwall carbon nanotubes and activated charcoal(MWCNTs/AC) mixed carbon composite electrodes. A detailed investigation of the effect of scan rate, temperature, potential window and orientation of ions on the electrodes surfaces is performed. The supercapacitors exhibited relatively lower specific capacitance for both [P_(4444)][HFuA] and [P_(4444)][TpA] ILs at room temperature. However, the specific capacitance has significantly increased with an increase in temperature and potential window. The equivalent serie resistances of the SCs is deceased with increasing temperatures, which is a result of improved ionic conductivities of the IL electrolytes. In CV cycling at60 °C, the capacitor with [P_(4444)][HFuA] IL-based electrolyte retained about 90% of its initial capacitance,while the capacitor with [P_(4444)][TpA] IL-based electrolyte retained about 83% of its initial *** computations revealed that the aromatic [FuA]^(-) and [TpA]^(-) anions displayed perpendicular distribution that can effectively neutralize charges on the carbon surfaces. However, the [HFuA]-anion exhibited somewhat tilted configurations on the carbon electrode surfaces, contributing to their outstanding capacitive performance in electrochemical devices.

关键词： Biomass Ionic liquids carbon electrodes Supercapacitors Molecular dynamic simulations

A Better Zn-Ion Storage Device:Recent Progress for Zn-Ion Hybrid Supercapacitors

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Nano-Micro Letters 2022年第4期14卷 158-206页

作者： Jialun Jin Xiangshun Geng Qiang Chen Tian-Ling Ren School of Integrated Circuits and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084People’s Republic of China College of Material Science and Engineering Zhejiang University of TechnologyHangzhou 310014People’s Republic of China

As a new generation of Zn-ion storage systems,Zn-ion hybrid supercapacitors(ZHSCs)garner tremendous interests recently from researchers due to the perfect integration of batteries and *** have excellent integration of high energy density and power density,which seamlessly bridges the gap between batteries and supercapacitors,becoming one of the most viable future options for large-scale equipment and portable electronic ***,the currently reported two configurations of ZHSCs and corresponding energy storage mechanisms still lack systematic ***,this review will be prudently organized from the perspectives of design strategies,electrode configurations,energy storage mechanisms,recent advances in electrode materials,electrolyte behaviors and further applications(micro or flexible devices)of *** synthesis processes and electrochemical properties of well-designed Zn anodes,capacitor-type electrodes and novel Zn-ion battery-type cathodes are comprehensively ***,a brief summary and outlook for the further development of ZHSCs are presented as *** review will provide timely access for researchers to the recent works regarding ZHSCs.

关键词： Zn-ion storage systems Zn-ion hybrid supercapacitors carbon electrodes Zinc anodes Electrolytes

碳纳米管/聚三己基噻吩复合材料增强空穴提取助力碳基CsPbI_(2)Br太阳电池实现新的记录效率

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Science China Materials 2023年第5期66卷 1727-1735页

作者：张桂芝张键鑫潘振晓饶华商钟新华 Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou 510642China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642China

碳基钙钛矿太阳电池(C-PSCs)具有低成本和高稳定性的优势,这归因于碳电极的化学惰性和疏水性.然而,C-PSCs的光伏性能通常低于相应的金属电极器件,其中最重要的原因是钙钛矿层和碳电极之间低的空穴提取效率.这里,我们发展了一种基于碳纳... 详细信息

碳基钙钛矿太阳电池(C-PSCs)具有低成本和高稳定性的优势,这归因于碳电极的化学惰性和疏水性.然而,C-PSCs的光伏性能通常低于相应的金属电极器件,其中最重要的原因是钙钛矿层和碳电极之间低的空穴提取效率.这里,我们发展了一种基于碳纳米管/聚三己基噻吩(CNT/P3HT,CP)复合材料的空穴传输材料用于构建C-PSCs.P3HT和CNTs之间的强相互作用力增强了P3HT的结晶度,同时也改善了CNTs的分散性.相比于纯P3HT,CP复合材料中的CNT提供了空穴传输的高速通道,进而有效地降低电荷传输阻抗和改善空穴提取效率.这种CP复合材料被用于组装CsPbI_(2)Br C-PSCs,其光电压由1.233 V提高到1.355 V,能量转换效率也由13.29%提高到15.56%,刷新了碳基全无机钙钛矿太阳电池的记录.

关键词： carbon nanotubes/poly(3-hexylthiophene)composites hole transport materials CsPbI_(2)Br carbon electrodes perovskite solar cells

Hybrid aqueous capacitors with improved energy/power performance

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Progress in Natural Science:Materials International 2015年第6期25卷 642-649页

作者： Jakub Menzel Krzysztof Fic Elzbieta Frackowiak Poznan University of Technology Institute of Chemistry and Technical Electrochemistry

This work reports on a high-voltage,hybrid capacitor involving two separate redox *** solutions of Mg(NO3)2and KI have been used for negative and positive electrode,*** p H ? 2 for electrode( t) with KI solution and modifying Mg(NO3)2solution to p H ? 9 for negative side play a crucial role for a stable long-term operation of capacitor at enhanced voltage.A benefit from such a construction is a pseudocapacitive contribution from hydrogen sorption reaction on the negative electrode and high iodine/iodide activity on the positive electrode,enhancing the energy with no remarkable impact on the power *** solution allows a high voltage(1.8 V) to be reached and thereby high power and energy performance( 20 W h/kg at 1 k W/kg) to be *** long-term stability has been confirmed by floating and galvanostatic tests.

关键词： Electrochemical capacitors High-voltage systems Hybrid systems carbon electrodes Aqueous systems Neutral electrolytes