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 dechlorination 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 °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.

通过两步恒电流电聚合法成功地构建了钯/聚苯胺/泡沫镍（Pd / PANI / Ni）复合电极。随后，通过扫描电子显微镜（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）表征了物理化学性质，如表观形态，晶体结构，表面状态和电化学性质。 ，傅立叶变换红外光谱（FTIR）和电化学阻抗谱（EIS）。考察了恒电流电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）电化学脱氯的复合电极的影响。所有结果表明，Pd / PANI / Ni复合电极中的PANI以针状存在，而Pd上的大量Pd颗粒则以簇状良好地分散在PANI的网络中。在最佳条件下，PANI分别以24 mA的聚合电流，0°C的温度和20分钟的时间在电极结构上聚合，可以实现89.1％的2,4-DCP去除率。最后，研究了电化学脱氯途径，主要脱氯产物为苯酚。该复合电极具有良好的稳定性和优异的电催化二氯化性能。其中PANI以24 mA的聚合电流，0°C的温度和20分钟的时间分别在电极结构上聚合，可以实现89.1％的2,4-DCP去除率。最后，研究了电化学脱氯途径，主要脱氯产物为苯酚。该复合电极具有良好的稳定性和优异的电催化二氯化性能。其中PANI以24 mA的聚合电流，0°C的温度和20分钟的时间分别在电极结构上聚合，可以实现89.1％的2,4-DCP去除率。最后，研究了电化学脱氯途径，主要脱氯产物为苯酚。该复合电极具有良好的稳定性和优异的电催化二氯化性能。