在泡沫镍基底上,以氯化钴(CoCl2·6H2O,分析纯)和尿素为原料,利用二次水热法制备了Co3O4@MnO2复合材料。通过X射线衍射仪(XRD)和场发射扫描电子显微镜(FESEM)分别对样品的结构和形貌进行表征,并使用循环伏安法(CV)、恒流充放电测试(...在泡沫镍基底上,以氯化钴(CoCl2·6H2O,分析纯)和尿素为原料,利用二次水热法制备了Co3O4@MnO2复合材料。通过X射线衍射仪(XRD)和场发射扫描电子显微镜(FESEM)分别对样品的结构和形貌进行表征,并使用循环伏安法(CV)、恒流充放电测试(GCD)和交流阻抗测试(EIS)研究了样品的电化学性能。实验结果表明,随着水热温度的增加,复合材料结构由纳米片状向纳米团状转变;充放电测试中,将不同水热温度下制备的Co3O4@MnO2复合材料的电容量进行对比,水热温度160℃,电流密度为0.3A g^-1反应条件下制备的电极材料比电容为2747.3 F g^-1,比电容最大,电化学性能优异。展开更多
Sodium-potassium(Na^(-)K)liquid alloys attract increasing research attention,as an ideal alternative of Li metal for metal-based batteries,attributing to their high abundance,low redox potential,high capacity,and dend...Sodium-potassium(Na^(-)K)liquid alloys attract increasing research attention,as an ideal alternative of Li metal for metal-based batteries,attributing to their high abundance,low redox potential,high capacity,and dendrite-free properties.In addition,the liquid and self-healing features of Na^(-)K alloys endow good electrode/electrolyte interfacial contact.The recent advances on the Na^(-)K liquid alloy-based batteries(NKBs)are reviewed herein.The anode designs for immobilization of the liquid alloy are introduced.The influences of the electrolyte and cathode materials on the battery performances are discussed.In addition,considering the co-existence of both K^(+)and Na^(+)in the electrolyte,the working mechanisms of the NKBs are elaborated.We also show that despite the improvement,challenges of the NKBs remain.The compatibility between Na^(-)K liquid alloy and electrolyte,as well as disputed working mechanisms,request detailed surface analyses of the liquid alloy and local element distribution evolution in the battery.This review would shed light on the fundamental understanding of Na^(-)K alloy electrochemistry and the development of dendrite-free metal-based energy storage systems with high energy density.展开更多
文摘在泡沫镍基底上,以氯化钴(CoCl2·6H2O,分析纯)和尿素为原料,利用二次水热法制备了Co3O4@MnO2复合材料。通过X射线衍射仪(XRD)和场发射扫描电子显微镜(FESEM)分别对样品的结构和形貌进行表征,并使用循环伏安法(CV)、恒流充放电测试(GCD)和交流阻抗测试(EIS)研究了样品的电化学性能。实验结果表明,随着水热温度的增加,复合材料结构由纳米片状向纳米团状转变;充放电测试中,将不同水热温度下制备的Co3O4@MnO2复合材料的电容量进行对比,水热温度160℃,电流密度为0.3A g^-1反应条件下制备的电极材料比电容为2747.3 F g^-1,比电容最大,电化学性能优异。
基金supported by the National Natural Science Foundation of China(52122209,52111530050,51772147)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX18_1128 and SJCX19_0218)the Research Foundation of State Key Lab(ZK201906 and ZK201805)。
文摘Sodium-potassium(Na^(-)K)liquid alloys attract increasing research attention,as an ideal alternative of Li metal for metal-based batteries,attributing to their high abundance,low redox potential,high capacity,and dendrite-free properties.In addition,the liquid and self-healing features of Na^(-)K alloys endow good electrode/electrolyte interfacial contact.The recent advances on the Na^(-)K liquid alloy-based batteries(NKBs)are reviewed herein.The anode designs for immobilization of the liquid alloy are introduced.The influences of the electrolyte and cathode materials on the battery performances are discussed.In addition,considering the co-existence of both K^(+)and Na^(+)in the electrolyte,the working mechanisms of the NKBs are elaborated.We also show that despite the improvement,challenges of the NKBs remain.The compatibility between Na^(-)K liquid alloy and electrolyte,as well as disputed working mechanisms,request detailed surface analyses of the liquid alloy and local element distribution evolution in the battery.This review would shed light on the fundamental understanding of Na^(-)K alloy electrochemistry and the development of dendrite-free metal-based energy storage systems with high energy density.
