本工作以镍离子交换的金属有机骨架氧化物Co-ZIF-67为模板制备得到空心NiO材料,并通过SEM、XRD、BET、FTIR、XPS、恒流充放电测试、循环伏安曲线等表征手段对空心NiO的结构、形貌、表面特性和电化学性能进行分析。SEM和BET测试表明制备...本工作以镍离子交换的金属有机骨架氧化物Co-ZIF-67为模板制备得到空心NiO材料,并通过SEM、XRD、BET、FTIR、XPS、恒流充放电测试、循环伏安曲线等表征手段对空心NiO的结构、形貌、表面特性和电化学性能进行分析。SEM和BET测试表明制备的NiO为表面具有纳米中孔的亚微米级的空心材料。XPS结果显示空心氧化镍表面Ni为+2价和+3价的混合价态,作为钠离子电池负极时,电流密度50 m A·g^(-1)条件下初始比容量能达到1133.6 m Ah·g^(-1),充电比容量达到549.7 m Ah·g^(-1),首次循环库仑效率为48.5%;50次循环后,放电比容量仍能达到330.1 m Ah·g^(-1),表现出优异的可逆储钠性能。展开更多
Solar evaporation based on plasmonic metal nanoparticles(MNPs)is emerging as a promising technology.However,the fine structure of MNPs is unstable,and both the high temperature generated by intensive light and corrosi...Solar evaporation based on plasmonic metal nanoparticles(MNPs)is emerging as a promising technology.However,the fine structure of MNPs is unstable,and both the high temperature generated by intensive light and corrosive ions in water could damage them.The performance will decline after recycling and long-time usage.To address these issues,we adopted a sponge-templating method for preparing sandwich-like nanoplates with the gold nanoparticles(Au NPs)confined in reduced graphene oxide(rGO)nanosheets.Due to the confinement effect,both the surface melting and ion diffusion were suppressed.The solar evaporator based on the sandwich-like nanoplates showed a high solar-vapor conversion efficiency of 85.2%under a high light intensity of 10 kW.After 30 times recycle of seawater desalination,the conversion efficiency scarcely decreased.These sandwich-like nanoplates with enhanced thermal and chemical stability of Au NPs are promising in the practical application of seawater desalination.展开更多
文摘本工作以镍离子交换的金属有机骨架氧化物Co-ZIF-67为模板制备得到空心NiO材料,并通过SEM、XRD、BET、FTIR、XPS、恒流充放电测试、循环伏安曲线等表征手段对空心NiO的结构、形貌、表面特性和电化学性能进行分析。SEM和BET测试表明制备的NiO为表面具有纳米中孔的亚微米级的空心材料。XPS结果显示空心氧化镍表面Ni为+2价和+3价的混合价态,作为钠离子电池负极时,电流密度50 m A·g^(-1)条件下初始比容量能达到1133.6 m Ah·g^(-1),充电比容量达到549.7 m Ah·g^(-1),首次循环库仑效率为48.5%;50次循环后,放电比容量仍能达到330.1 m Ah·g^(-1),表现出优异的可逆储钠性能。
基金This work was supported by the National Natural Science Foundation of China(51732011,21431006,21761132008,81788101 and 11227901)the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(21521001)+2 种基金the Key Research Program of Frontier Sciences,CAS(QYZDJ-SSW-SLH036)the National Basic Research Program of China(2014CB931800)the Users with Excellence and Scientific Research Grant of Hefei Science Center of CAS(2015HSC-UE007).This work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.
文摘Solar evaporation based on plasmonic metal nanoparticles(MNPs)is emerging as a promising technology.However,the fine structure of MNPs is unstable,and both the high temperature generated by intensive light and corrosive ions in water could damage them.The performance will decline after recycling and long-time usage.To address these issues,we adopted a sponge-templating method for preparing sandwich-like nanoplates with the gold nanoparticles(Au NPs)confined in reduced graphene oxide(rGO)nanosheets.Due to the confinement effect,both the surface melting and ion diffusion were suppressed.The solar evaporator based on the sandwich-like nanoplates showed a high solar-vapor conversion efficiency of 85.2%under a high light intensity of 10 kW.After 30 times recycle of seawater desalination,the conversion efficiency scarcely decreased.These sandwich-like nanoplates with enhanced thermal and chemical stability of Au NPs are promising in the practical application of seawater desalination.
