摘要
层状双金属氢氧化物(LDH)是一种二维层状纳米材料,因其易于复合功能化的特点广泛应用于催化、分离、生物及电化学领域.为了研究葡萄糖(G)和十二烷基硫酸钠(SDS)的加入对LDH结构和性能的影响,采用水热法在泡沫镍基体上分别原位合成了G和SDS插层的镍钴双金属氢氧化物(NiCo-LDH).利用SEM观察对比了不同插层调控的LDH形貌,利用XRD、FT-IR和BET等表征方法,探究了G和SDS插层NiCo-LDH的结构组成及分子间的相互作用.结果表明G和SDS成功插入到镍钴双金属氢氧化物层间,相比未插层NiCo-LDH,经过插层处理的NiCo-LDH纳米片尺寸均较小.SDS插层NiCo-LDH的层间距高达1.17 nm,是未插层NiCo-LDH层间距的1.46倍,此外SDS插层NiCo-LDH的介孔比表面积远高于G插层和未插层NiCo-LDH.采用循环伏安法(CV)和恒流充放电法(GCD)对比探究G和SDS插层NiCo-LDH以及未插层处理NiCo-LDH之间的电化学性能差异.结果表明SDS插层的NiCo-LDH拥有较高的比电容值为1911.6 F/g,比未插层的NiCo-LDH高出24.2%,这是因为其自身较小的纳米尺寸、较高的层间距以及高的比表面积结构特点.G插层的NiCo-LDH因二次生长较差导致比电容较低为806.1 F/g.由于结构的非均一性,插层处理的NiCo-LDH的循环稳定性相对较差.插层效应的研究可以为LDH在超级电容器的应用提供新的研究思路.
Layered double hydroxide(LDH)is a two-dimensional layered nanomaterial widely used in catalysis,separation,biology,and electrochemistry owing to its functionalization.In this study,nickel-cobalt LDH(NiCo-LDH)intercalated with glucose(G)and sodium dodecyl sulfate(SDS)was synthesized in situ through the hydrothermal method to investigate the effects of G and SDS on the LDH structure and properties.Scanning electron microscopy was conducted to compare the morphologies of different intercalated LDHs.X-ray diffraction,Fourier-transform infrared spectroscopy,Brunauer-Emmett-Teller,and other characterization methods were used to investigate the microstructure and the molecular interactions of G-and SDS-intercalated NiCo-LDH.The results show that G and SDS can be successfully inserted into the NiCo-LDH layer.Compared with that of the unintercalated NiCo-LDH,the sizes of the intercalated NiCo-LDH nanosheets were smaller.The interlayer spacing of SDS intercalated NiCo-LDH layer was 1.17 nm,which was 1.46 times of that of unintercalated NiCo-LDH layer.In addition,the mesoporous specific surface area of the SDS-intercalated NiCo-LDH was much higher than that of the G-intercalated and unintercalated NiCo-LDHs.The differences in the electrochemical properties were further explored by cyclic voltammetry and galvanostatic charge-discharge methods.The results show that the SDS-intercalated NiCo-LDH had a specific capacitance of 1911.6 F/g,which was 24.2%higher than that of the unintercalated NiCo-LDH,mainly because of the structural characteristics,such as small nanometer size,high layer spacing,and high specific surface area.The specific capacitance of the G-intercalated NiCo-LDH was 806.1 F/g owing to the poor secondary growth.Meanwhile,the intercalated NiCo-LDH showed relatively poor cycle stability owing to the structural heterogeneity.The intercalation effects of different molecules or ions can provide a new path for LDH application in supercapacitors.
作者
汪洋
郑风华
潘钱锋
刘丽艳
Wang Yang;Zheng Fenghua;Pan Qianfeng;Liu Liyan(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Membrane Science and Desalination Technology,Tianjin 300072,China)
出处
《天津大学学报(自然科学与工程技术版)》
EI
CAS
CSCD
北大核心
2022年第9期927-932,共6页
Journal of Tianjin University:Science and Technology
基金
国家自然科学基金资助项目(22178253,22111530225).