Lithium/potassium ion capacitors(LICs/PICs) have been proposed to bridge the performance gap between high-energy batteries and high-power capacitors.However,their development is hindered by the choice,electrochemical ...Lithium/potassium ion capacitors(LICs/PICs) have been proposed to bridge the performance gap between high-energy batteries and high-power capacitors.However,their development is hindered by the choice,electrochemical performance,and preparation technique of the battery-type anode materials.Herein,a nitrogen and phosphorus dual-doped multilayer graphene(NPG) material is designed and synthesized through an arc discharge process,using low-cost graphite and solid nitrogen and phosphorus sources.When employed as the anode material,NPG exhibits high capacity,remarkable rate capability,and stable cycling performance in both lithium and potassium ion batteries.This excellent electrochemical performance is ascribed to the synergistic effect of nitrogen and phosphorus doping,which enhances the electrochemical conductivity,provides a higher number of ion storage sites,and leads to increased interlayer spacing.Full carbon-based NPG‖LiPF6‖active carbon(AC) LICs and NPG‖KPF6‖AC PICs are assembled and show excellent electrochemical performance,with competitive energy and power densities.This work provides a route for the large-scale production of dual-doped graphene as a universal anode material for high-performance alkali ion batteries and capacitors.展开更多
Metal-free, heteroatom functionalized carbon-based catalysts have made remarkable progress in recent years in a wide range of applications related to energy storage and energy generation. In this study, high surface a...Metal-free, heteroatom functionalized carbon-based catalysts have made remarkable progress in recent years in a wide range of applications related to energy storage and energy generation. In this study, high surface area mesoporous ordered sulphur doped carbon materials are obtained via one-pot hydrothermal synthesis of carbon/SBA-15 composite after removal of in-situ synthesized hard template SiO2. 2-thiophenecarboxy acid as sulphur source gives rise to sulphur doping level of 5.5 wt%. Comparing with pristine carbon, the sulphur doped mesoporous ordered carbon demonstrates improved electro-catalytic activity in the oxygen reduction reaction in alkaline solution. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.展开更多
Heteroatom-doped carbon nanomaterials have attracted significant attention as anode materials for sodium-ion batteries （SIBs）. Herein, we demonstrate a conjugated polymer-mediated synthesis of sulfur and nitrogen co...Heteroatom-doped carbon nanomaterials have attracted significant attention as anode materials for sodium-ion batteries （SIBs）. Herein, we demonstrate a conjugated polymer-mediated synthesis of sulfur and nitrogen co-doped carbon nanotubes （S/N-CT） via the carbonization of sulfur-containing polyaniline （PANI） nanotubes. It is found that the carbonization technique greatly influences the structural features and thus the Na-storage behavior of the S/N-CT materials. The carbon nanotubes developed using a two-step carbonization process （heating at 400℃ and then at 900℃） exhibit a high specific surface area, enlarged interlayer distance, small charge transfer resistance, enhanced reaction kinetics, as well as a large number of defects and active sites; further, they exhibit a high reversible capacity of 340 mAh·g^-1 at 0.1 A·g^-1 and a remarkable cycling stability with a capacity of 141 mAh·g^-1 at 5 A·g^-1 （94% retention after 3,000 cydes）. Direct carbonization of conjugated polymers with a specific morphology is an eco-friendly and low-cost technique for the synthesis of dual atom-doped carbon nanomaterials for application in energy devices. However, the carbonization process should be carefully controlled in order to better tune the structure-property relationship.展开更多
Banana peel-derived porous carbon(BPPC) was prepared from banana peel and used as an adsorbent for methyl orange(MO) wastewater removal. BPPC-MO50 is a N,S-doped BPPC obtained via secondary carbonization. The BPPC-MO5...Banana peel-derived porous carbon(BPPC) was prepared from banana peel and used as an adsorbent for methyl orange(MO) wastewater removal. BPPC-MO50 is a N,S-doped BPPC obtained via secondary carbonization. The BPPC-MO50 exhibited a high specific surface area of1774.3 m^2/g. Heteroatom-doped porous carbon(PC) was successfully synthesized from the BPPC absorbed MO at high temperature and used for oxygen reduction. The BPPC-MO50 displayed the highest ORR onset potential among all carbon-based electrocatalysts, i.e., 0.93 V vs.reversible hydrogen electrode(RHE). This is the first report to describe porous carbon-activated materials from agriculture and forestry waste that is used for adsorption of dyes from wastewater via an enhanced heteroatom(N,S) content. These results may contribute to the sustainable development of dye wastewater treatment by transforming saturated PC into an effective material and has potential applications in fuel cells or as energy sources.展开更多
以石墨烯/N-甲基吡咯烷酮(NMP)分散体和Co(NO_3)_2混合物为前驱体,经过高温和化学掺杂处理,制备了钴/氮掺杂的碳纳米管/石墨烯复合材料(Co/N-CNT/Gr-X,X代表煅烧温度),并对其进行物相表征和电化学性能测试.结果表明,在钴盐催化下,石墨...以石墨烯/N-甲基吡咯烷酮(NMP)分散体和Co(NO_3)_2混合物为前驱体,经过高温和化学掺杂处理,制备了钴/氮掺杂的碳纳米管/石墨烯复合材料(Co/N-CNT/Gr-X,X代表煅烧温度),并对其进行物相表征和电化学性能测试.结果表明,在钴盐催化下,石墨烯分散体中的有机溶剂NMP成为碳源,在石墨烯表面形成高密度的碳纳米管,形成了三维多级结构;同时,钴离子部分氧化成为氧化物,部分与N形成Co—N活性位点,其协同作用极大改善了催化剂的氧还原性能.其中Co/N-CNT/Gr-800的还原峰电位为-0.137 V(vs.SCE),极限电流密度为4.24 m A/cm^2,电子转移数为3.34,表现出优异的耐甲醇中毒能力.展开更多
基金supported by National Natural Science Foundation of China(Nos.51672056 and 51702063)Natural Science Foundation of Heilongjiang(LC2018004)+1 种基金China Postdoctoral Science Foundation(2018M630340)the Fundamental Research Funds for the Central University(HEUCFD201732)
文摘Lithium/potassium ion capacitors(LICs/PICs) have been proposed to bridge the performance gap between high-energy batteries and high-power capacitors.However,their development is hindered by the choice,electrochemical performance,and preparation technique of the battery-type anode materials.Herein,a nitrogen and phosphorus dual-doped multilayer graphene(NPG) material is designed and synthesized through an arc discharge process,using low-cost graphite and solid nitrogen and phosphorus sources.When employed as the anode material,NPG exhibits high capacity,remarkable rate capability,and stable cycling performance in both lithium and potassium ion batteries.This excellent electrochemical performance is ascribed to the synergistic effect of nitrogen and phosphorus doping,which enhances the electrochemical conductivity,provides a higher number of ion storage sites,and leads to increased interlayer spacing.Full carbon-based NPG‖LiPF6‖active carbon(AC) LICs and NPG‖KPF6‖AC PICs are assembled and show excellent electrochemical performance,with competitive energy and power densities.This work provides a route for the large-scale production of dual-doped graphene as a universal anode material for high-performance alkali ion batteries and capacitors.
基金supported by the University of Electronic Science and Technology of China(Y02002010301080)the National Science Foundation of China(51502032)the financial support from Natural Science Foundation of Zhejiang Province(No.LQ14E020003)
文摘Metal-free, heteroatom functionalized carbon-based catalysts have made remarkable progress in recent years in a wide range of applications related to energy storage and energy generation. In this study, high surface area mesoporous ordered sulphur doped carbon materials are obtained via one-pot hydrothermal synthesis of carbon/SBA-15 composite after removal of in-situ synthesized hard template SiO2. 2-thiophenecarboxy acid as sulphur source gives rise to sulphur doping level of 5.5 wt%. Comparing with pristine carbon, the sulphur doped mesoporous ordered carbon demonstrates improved electro-catalytic activity in the oxygen reduction reaction in alkaline solution. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
基金We thank the financial support from National Natural Science Foundation of China （Nos. 21471039, 21571043, and 21671047）, Fundamental Research Funds for the Central Universities （PIRS of HIT A201502 and HIT. BRETⅢ. 201223）, China Postdoctoral Science Foundation （No. 2014M560253）, Postdoctoral Scientific Research Fund of Heilongjiang Province （Nos. LBH-Q14062 and LBH-Z14076）, Natural Science Foundation of Heilongjiang Province （No. B2015001）, and Youth Innovation Promotion Association of CAS （No. 2015316）.
文摘Heteroatom-doped carbon nanomaterials have attracted significant attention as anode materials for sodium-ion batteries （SIBs）. Herein, we demonstrate a conjugated polymer-mediated synthesis of sulfur and nitrogen co-doped carbon nanotubes （S/N-CT） via the carbonization of sulfur-containing polyaniline （PANI） nanotubes. It is found that the carbonization technique greatly influences the structural features and thus the Na-storage behavior of the S/N-CT materials. The carbon nanotubes developed using a two-step carbonization process （heating at 400℃ and then at 900℃） exhibit a high specific surface area, enlarged interlayer distance, small charge transfer resistance, enhanced reaction kinetics, as well as a large number of defects and active sites; further, they exhibit a high reversible capacity of 340 mAh·g^-1 at 0.1 A·g^-1 and a remarkable cycling stability with a capacity of 141 mAh·g^-1 at 5 A·g^-1 （94% retention after 3,000 cydes）. Direct carbonization of conjugated polymers with a specific morphology is an eco-friendly and low-cost technique for the synthesis of dual atom-doped carbon nanomaterials for application in energy devices. However, the carbonization process should be carefully controlled in order to better tune the structure-property relationship.
基金supported by the Doctor Foundation of Bingtuan (No.2014BB004)National Natural Science Foundation of China (U130329)+1 种基金the Program for Changjiang Scholars, Innovative Research Team in University (No. IRT_15R46)the Program of Science and Technology Innovation Team in Bingtuan (No. 2015BD003)
文摘Banana peel-derived porous carbon(BPPC) was prepared from banana peel and used as an adsorbent for methyl orange(MO) wastewater removal. BPPC-MO50 is a N,S-doped BPPC obtained via secondary carbonization. The BPPC-MO50 exhibited a high specific surface area of1774.3 m^2/g. Heteroatom-doped porous carbon(PC) was successfully synthesized from the BPPC absorbed MO at high temperature and used for oxygen reduction. The BPPC-MO50 displayed the highest ORR onset potential among all carbon-based electrocatalysts, i.e., 0.93 V vs.reversible hydrogen electrode(RHE). This is the first report to describe porous carbon-activated materials from agriculture and forestry waste that is used for adsorption of dyes from wastewater via an enhanced heteroatom(N,S) content. These results may contribute to the sustainable development of dye wastewater treatment by transforming saturated PC into an effective material and has potential applications in fuel cells or as energy sources.
文摘以石墨烯/N-甲基吡咯烷酮(NMP)分散体和Co(NO_3)_2混合物为前驱体,经过高温和化学掺杂处理,制备了钴/氮掺杂的碳纳米管/石墨烯复合材料(Co/N-CNT/Gr-X,X代表煅烧温度),并对其进行物相表征和电化学性能测试.结果表明,在钴盐催化下,石墨烯分散体中的有机溶剂NMP成为碳源,在石墨烯表面形成高密度的碳纳米管,形成了三维多级结构;同时,钴离子部分氧化成为氧化物,部分与N形成Co—N活性位点,其协同作用极大改善了催化剂的氧还原性能.其中Co/N-CNT/Gr-800的还原峰电位为-0.137 V(vs.SCE),极限电流密度为4.24 m A/cm^2,电子转移数为3.34,表现出优异的耐甲醇中毒能力.
