Preparation and characterization of palladium/polyaniline/foamed nickel composite electrode for electrocatalytic dechlorination
Preparation and characterization of palladium/polyaniline/foamed nickel composite electrode for electrocatalytic dechlorination
复制标题
电催化脱氯用钯/聚苯胺/泡沫镍复合电极的制备及表征
DOI：
10.1016/j.seppur.2018.09.040
复制
发表时间：
2019-03-18
影响因子：
8.6
通讯作者：
Cheng, Xiuwen
中科院分区：
文献类型：
--
作者：
Li, Junjing;Luan, Cong;Cheng, Xiuwen
采用两步恒电流电聚合法成功地制备了钯/聚苯胺/泡沫镍（Pd/PANI/Ni）复合电极。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、X射线光电子显微镜（XPS）、傅里叶变换红外光谱（FTIR）和电化学阻抗谱（EIS）等手段对样品的表观形貌、晶体结构、表面状态和电化学性能进行了表征。研究了恒电流聚合反应的聚合电流、温度和反应时间对2，4-二氯苯酚（2，4-DCP）电化学脱氯复合电极的影响。结果表明，PANI在Pd/PANI/Ni复合电极中以针状存在，而零价Pd粒子以团簇形式分散在PANI上。在最佳条件下，当聚合电流为2,4 mA，温度为0 ℃，时间为20 min时，聚苯胺在电极结构上的聚合对2，4-DCP的去除率可达89.1%。最后，对电化学脱氯途径进行了研究，主要脱氯产物为苯酚。该复合电极具有良好的稳定性和优良的电催化二氯化性能。
In the present work, palladium/polyaniline/foamed nickel (Pd/PANI/Ni) composite electrode was successfully constructed via two-step galvanostatic electropolymerization method. Subsequently, physicochemical properties such as apparent morphologies, crystalline structure, surface state and electrochemical property were characterized through scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron microscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Electrochemical impedance spectroscopy (EIS). The effects of the polymerization current, temperature and reaction time of galvanostatic electropolymerization on the composite electrode for the electrochemical de chlorination of 2,4-dichlorophenol (2,4-DCP) were examined. All results indicated that PANI in the Pd/PANI/Ni composite electrode existed in the form of needle-shaped, while nulvalent Pd particles dispersed well as clusters in the network on PANI. Under optimal conditions, in which PANI polymerized on electrode structure with the polymerization current of 24 mA, temperature of 0 degrees C and time of 20 min, respectively, a 89.1% removal rate of 2,4-DCP could be achieved. Finally, electrochemical dechlorination pathway was investigated and the main dechlorination product was phenol. The composite electrode possessed good stability and excellent electrocatalytic dichlorination performance.