Thin films of capillary deposited nickel hexacyanoferrate(NiHCF) were investigated as electrochemically switched ion exchange(ESIX) materials. The films were generated on platinum and graphite substrates based on the ...Thin films of capillary deposited nickel hexacyanoferrate(NiHCF) were investigated as electrochemically switched ion exchange(ESIX) materials. The films were generated on platinum and graphite substrates based on the ternary reagent diagram. In 1 mol/L KNO3 solution, cyclic voltammetry(CV) combined with energy-dispersive X-ray spectroscopy(EDS) was used to determine the influence of experimental conditions on the electroactivity of the NiHCF thin film on Pt substrates. The ion selectivity, ion-exchange capacity and the regenerability of NiHCF films on Pt and graphite substrates were investigated. The experiment results show that the NiHCF thin films from Ni2+-poor growth conditions have double peaks CV curves and contain relatively larger amount of potassium; while those from Ni2+-rich growth conditions are single peak CV curves and contain relatively smaller amount of potassium. It is demonstrated that the NiHCF thin films of capillary chemical deposition have good ESIX performances.展开更多
The ion selectivity of nickel hexacyanoferrate thin film to alkali cations in ESIX (electrochemically switched ion exchange) processes was investigated using molecular dynamics(MD) techniques; water and cation (Na+ an...The ion selectivity of nickel hexacyanoferrate thin film to alkali cations in ESIX (electrochemically switched ion exchange) processes was investigated using molecular dynamics(MD) techniques; water and cation (Na+ and Cs+) intercalation, configuration, and dynamics in reduced nickel hexacyanoferrate structures with different cation combinations were studied and compared with the experimental results. In the simulations, water was represented by an extended simple point-charge(SPC/E) model, and all other atomic interactions were represented by a universal force field(UFF). The potential energies of various cations combination (Cs+ and Na+) in reduced i-NiHCF and 1 mol/L Cs/NaCl mixed solution were obtained. In most cases, the total potential energy of the solid is reduced when water is intercalated into the various reduced NiHCF structures. Combining the solid and the solution simulation results, it is shown that the solid composition of 3Cs+/1Na+ is the stablest structure form (NaCs3Ni4[Fe(CN)6]3) over a range of solution compositions.展开更多
采用循环伏安法在碳纳米管（CNTs）修饰的玻碳电极上合成聚中性红（PNR）/铁氰化镍（NiHCF）颗粒,并分别采用扫描电镜（SEM）、傅里叶红外（FT-IR）、循环伏安法（CV）和计时安培电流法（CA）等方法考察了复合膜的微观形貌、结构和电化...采用循环伏安法在碳纳米管（CNTs）修饰的玻碳电极上合成聚中性红（PNR）/铁氰化镍（NiHCF）颗粒,并分别采用扫描电镜（SEM）、傅里叶红外（FT-IR）、循环伏安法（CV）和计时安培电流法（CA）等方法考察了复合膜的微观形貌、结构和电化学催化性能.结果表明,复合膜为三维多孔有序的网络状结构,PNR和 NiHCF 以纳米颗粒形式存在并沿 CNTs 均匀分布.PNR/NiHCF/CNTs 复合膜对过氧化氢（H 2 O 2）表现出了优异的电催化性能并显示出了良好的协同效应.该复合膜电极对 H 2 O 2的催化还原电流与其浓度在6．25＆#215;10-6~3＆#215;10-3之间呈良好的线性关系,线性相关系数 R ＝0．9989,检出限为1＆#215;10-7 mol/L,同时具有较高的灵敏度1455．9 mA？？L/（mol？？cm2）,并且复合膜有良好的稳定性和重现性,可实际应用于H 2 O 2传感器.展开更多
基金Project(20006011) supported by the National Natural Science Foundation of China Project(20021017) supported by the Natural Science Foundation of Shanxi Province Project(2004-24) supported by the Scholar Council Foundation of Shanxi Province, China
文摘Thin films of capillary deposited nickel hexacyanoferrate(NiHCF) were investigated as electrochemically switched ion exchange(ESIX) materials. The films were generated on platinum and graphite substrates based on the ternary reagent diagram. In 1 mol/L KNO3 solution, cyclic voltammetry(CV) combined with energy-dispersive X-ray spectroscopy(EDS) was used to determine the influence of experimental conditions on the electroactivity of the NiHCF thin film on Pt substrates. The ion selectivity, ion-exchange capacity and the regenerability of NiHCF films on Pt and graphite substrates were investigated. The experiment results show that the NiHCF thin films from Ni2+-poor growth conditions have double peaks CV curves and contain relatively larger amount of potassium; while those from Ni2+-rich growth conditions are single peak CV curves and contain relatively smaller amount of potassium. It is demonstrated that the NiHCF thin films of capillary chemical deposition have good ESIX performances.
基金Project (20006011) supported by the National Natural Science Foundation of China Project (20021017) by the Natural Science Foundation of Shanxi Province Project (2004-24) by the Scholarship Council Foundation of Shanxi Province
文摘The ion selectivity of nickel hexacyanoferrate thin film to alkali cations in ESIX (electrochemically switched ion exchange) processes was investigated using molecular dynamics(MD) techniques; water and cation (Na+ and Cs+) intercalation, configuration, and dynamics in reduced nickel hexacyanoferrate structures with different cation combinations were studied and compared with the experimental results. In the simulations, water was represented by an extended simple point-charge(SPC/E) model, and all other atomic interactions were represented by a universal force field(UFF). The potential energies of various cations combination (Cs+ and Na+) in reduced i-NiHCF and 1 mol/L Cs/NaCl mixed solution were obtained. In most cases, the total potential energy of the solid is reduced when water is intercalated into the various reduced NiHCF structures. Combining the solid and the solution simulation results, it is shown that the solid composition of 3Cs+/1Na+ is the stablest structure form (NaCs3Ni4[Fe(CN)6]3) over a range of solution compositions.
文摘采用循环伏安法在碳纳米管（CNTs）修饰的玻碳电极上合成聚中性红（PNR）/铁氰化镍（NiHCF）颗粒,并分别采用扫描电镜（SEM）、傅里叶红外（FT-IR）、循环伏安法（CV）和计时安培电流法（CA）等方法考察了复合膜的微观形貌、结构和电化学催化性能.结果表明,复合膜为三维多孔有序的网络状结构,PNR和 NiHCF 以纳米颗粒形式存在并沿 CNTs 均匀分布.PNR/NiHCF/CNTs 复合膜对过氧化氢（H 2 O 2）表现出了优异的电催化性能并显示出了良好的协同效应.该复合膜电极对 H 2 O 2的催化还原电流与其浓度在6．25＆#215;10-6~3＆#215;10-3之间呈良好的线性关系,线性相关系数 R ＝0．9989,检出限为1＆#215;10-7 mol/L,同时具有较高的灵敏度1455．9 mA？？L/（mol？？cm2）,并且复合膜有良好的稳定性和重现性,可实际应用于H 2 O 2传感器.
