镍网基NiHCF膜电极电控离子分离性能

ELECTROCHEMICALLY CONTROLLED ION SEPARATION PROPERTIES OF NICKEL HEXACYANOFERRATE THIN FILMS WITH NI MESH SUBSTRATE

在镍网基体上通过阳极氧化、循环伏安电沉积、化学沉积与脉冲电沉积分别制备出具有电化学控制离子分离(ECIS)性能的铁氰化镍(Nickel hexacyanoferrate,NiHCF)薄膜电极。在1mol·L-1KNO3溶液中采用电势循环可逆地置入与释放碱金属离子,考察不同制备方法膜电极的离子交换容量、循环寿命与再生能力,并通过SEM、IR、IC分析了膜电极表面形貌、组成与ECIS过程性能。研究结果表明,镍网基NiHCF膜电极制备工艺简单,具有较大的离子分离能力、良好的循环稳定性与再生能力,其中脉冲电沉积膜电极的离子交换容量和循环稳定性优于其它方法制得的膜电极。

Nickel hexacyanoferrate （NiHCF） thin film electrodes of Ni mesh substrate for Electrochemically Controlled Ion Separation （ECIS） were made by anodic oxidation, cyclic voltammetry （CV） electrodeposition, chemical deposition and pulsed electrodeposition respectively. In 1 mol·L^-1 KNO3 solution cyclic voltammetry （CV） was used to reversibly intercalate and deintercalate K^＋ from the matrix and to investigate the electroactivity, ion-exchange capacity and the regeneration capability of NiHCF films. The morphology, composition and process ofECIS ofthe film electrodes were characterized by scanning electron microscopy （SEM）, infrared spectroscopy （IR） and ion chromatography （IC）. Experimental results show that the preparation process of the electrodes is simple. NiHCF thin film electrodes with Ni mesh substrate have higher separation capacity, good stability and regenerability. The ion-exchange capacity and cycle life of the NiHCF film electrode prepared with pulsed electrodeposition are higher than those of other film electrodes systems.