According to the reports of"Top Ten Emerging Technologies in Chemistry 2022"released by the International Union of Pure and Applied Chemistry,sodium-ion battery(SIB)technology is identified as a crucial emer...According to the reports of"Top Ten Emerging Technologies in Chemistry 2022"released by the International Union of Pure and Applied Chemistry,sodium-ion battery(SIB)technology is identified as a crucial emerging technology,indicating its promising development for future energy-storage applications[1].In practical applications,commercialized lithium-ion batteries(LIBs)with lithium cobalt oxide and ternary oxide as cathode materials have assumed a dominant position[2].However,these cathode materials of LIBs are highly dependent on expensive cobalt and nickel,rendering them less sustainable for grid-scale energy storage.Conversely,cathode materials in SIBs appear more sustainable due to their lower dependence on cobalt.Furthermore,the strategic importance of reducing over-dependence on lithium resources cannot be overstated.Hence,SIB technology can serve as one of the potential solutions to mitigate this issue[3].展开更多
金属硫化物在超级电容器领域具有良好的应用前景,但缓慢的反应动力学抑制了其电化学性能.增加电化学表面积并与碳材料结合可以改善其电化学性能.然而,寻求一种简单通用的方法制备金属硫化物和导电碳的复合材料仍具有挑战性.本文设计了...金属硫化物在超级电容器领域具有良好的应用前景,但缓慢的反应动力学抑制了其电化学性能.增加电化学表面积并与碳材料结合可以改善其电化学性能.然而,寻求一种简单通用的方法制备金属硫化物和导电碳的复合材料仍具有挑战性.本文设计了一种简单的一步热解法,在温和的条件下将硫化钴镍(CoNi2S4)原位生长在还原氧化石墨烯(rGO)纳米片上.制备的硫化镍钴/还原氧化石墨烯(CoNi2S4/rGO)材料具备纳米片结构,可以提供大量的活性位点,有效地缩短电子/离子的扩散路径.得益于这些优点,所制备的CoNi2S4/rGO电极材料在电流密度分别为2和20 A g^−1时具有1526和988 F g^−1的高比电容.基于CoNi2S4/rGO的非对称超级电容器工作电压窗口为1.6 V,在功率密度为798 W kg^−1时能量密度高达54.8 W h kg^−1.在3 A g^−1下循环8000次后,其容量保持率为93.7%.利用该方法可获得一系列金属硫化物/rGO复合材料,此通用策略可推广应用于各种能源器件电极材料的制备.展开更多
水系超级电容器具有能量密度高,循环稳定性好,安全性高等优势,但低能量密度阻碍了其进一步应用.通过一种简单有效的方法得到具有高能量密度和宽电压的水系超级电容器依旧面临挑战.本工作设计了一种三氧化二钒/碳纳米空心球(H-V_(2)O_(3)...水系超级电容器具有能量密度高,循环稳定性好,安全性高等优势,但低能量密度阻碍了其进一步应用.通过一种简单有效的方法得到具有高能量密度和宽电压的水系超级电容器依旧面临挑战.本工作设计了一种三氧化二钒/碳纳米空心球(H-V_(2)O_(3)/C)电极,并将其应用于水系超级电容器.碳的引入可以提高材料的导电性和稳定性,同时空心结构有利于提高电化学活性面积,提供快速的离子传输通道.此外,这种集成电极可同时工作于正极和负极电压窗口.因此,H-V_(2)O_(3)/C集成电极在-1.1–1.3 V的电压窗口下具有708.6 F g^(-1)的比容量.基于其多重储能机制,得到的水系对称超级电容器比传统的(非)对称超级电容器具有更高的电压窗口和能量密度.在2.4 V的宽电压下工作,当功率密度为1204.6 W kg^(-1)时具有96.8 W h kg^(-1)的高能量密度,同时具有优良的循环稳定性.本研究对电极材料的设计和制备具有一定的启发意义,为开发宽电压水系超级电容器开辟了一条新途径.展开更多
基金supported by the National Key R&D Program of China(2023YFE0202000)the National Natural Science Foundation of China(52173246)Double-Thousand Talents Plan of Jiangxi Province(jxsq2023102005)。
文摘According to the reports of"Top Ten Emerging Technologies in Chemistry 2022"released by the International Union of Pure and Applied Chemistry,sodium-ion battery(SIB)technology is identified as a crucial emerging technology,indicating its promising development for future energy-storage applications[1].In practical applications,commercialized lithium-ion batteries(LIBs)with lithium cobalt oxide and ternary oxide as cathode materials have assumed a dominant position[2].However,these cathode materials of LIBs are highly dependent on expensive cobalt and nickel,rendering them less sustainable for grid-scale energy storage.Conversely,cathode materials in SIBs appear more sustainable due to their lower dependence on cobalt.Furthermore,the strategic importance of reducing over-dependence on lithium resources cannot be overstated.Hence,SIB technology can serve as one of the potential solutions to mitigate this issue[3].
基金This work was financially supported by the National Natural Science Foundation of China(21704038 and 51763018)the National Natural Science Foundation of China(NSFC)-German Research Foundation(DFG)Joint Research Project(51761135114)+2 种基金the Natural Science Foundation of Jiangxi Province(20192BCB23001,2018ACB21021 and 20171ACB21009)China Postdoctoral Science Foundation(2018M632599)the National Postdoctoral Program for Innovative Talents(BX201700112).
文摘金属硫化物在超级电容器领域具有良好的应用前景,但缓慢的反应动力学抑制了其电化学性能.增加电化学表面积并与碳材料结合可以改善其电化学性能.然而,寻求一种简单通用的方法制备金属硫化物和导电碳的复合材料仍具有挑战性.本文设计了一种简单的一步热解法,在温和的条件下将硫化钴镍(CoNi2S4)原位生长在还原氧化石墨烯(rGO)纳米片上.制备的硫化镍钴/还原氧化石墨烯(CoNi2S4/rGO)材料具备纳米片结构,可以提供大量的活性位点,有效地缩短电子/离子的扩散路径.得益于这些优点,所制备的CoNi2S4/rGO电极材料在电流密度分别为2和20 A g^−1时具有1526和988 F g^−1的高比电容.基于CoNi2S4/rGO的非对称超级电容器工作电压窗口为1.6 V,在功率密度为798 W kg^−1时能量密度高达54.8 W h kg^−1.在3 A g^−1下循环8000次后,其容量保持率为93.7%.利用该方法可获得一系列金属硫化物/rGO复合材料,此通用策略可推广应用于各种能源器件电极材料的制备.
基金financially supported by the National Natural Science Foundation of China (NSFC, 52073137, 21704038and 51763018)the NSFC-DFG Joint Research Project (51761135114)+1 种基金the Natural Science Foundation of Jiangxi Province (20192BCB23001and 20202ZDB01009)the National Postdoctoral Program for Innovative Talents (BX201700112)
文摘水系超级电容器具有能量密度高,循环稳定性好,安全性高等优势,但低能量密度阻碍了其进一步应用.通过一种简单有效的方法得到具有高能量密度和宽电压的水系超级电容器依旧面临挑战.本工作设计了一种三氧化二钒/碳纳米空心球(H-V_(2)O_(3)/C)电极,并将其应用于水系超级电容器.碳的引入可以提高材料的导电性和稳定性,同时空心结构有利于提高电化学活性面积,提供快速的离子传输通道.此外,这种集成电极可同时工作于正极和负极电压窗口.因此,H-V_(2)O_(3)/C集成电极在-1.1–1.3 V的电压窗口下具有708.6 F g^(-1)的比容量.基于其多重储能机制,得到的水系对称超级电容器比传统的(非)对称超级电容器具有更高的电压窗口和能量密度.在2.4 V的宽电压下工作,当功率密度为1204.6 W kg^(-1)时具有96.8 W h kg^(-1)的高能量密度,同时具有优良的循环稳定性.本研究对电极材料的设计和制备具有一定的启发意义,为开发宽电压水系超级电容器开辟了一条新途径.
