Electrochemical Synthesis of Porous Polyaniline Electrodes Using HKUST-1 as a Template and their Electrochemical Supercapacitor Property
- 2017年第23卷 
以涂敷在碳布基体上的金属有机骨架多孔材料HKUST-1为硬模板，使用单极脉冲法沉积聚苯胺制备了具有电活性的多孔复合电极Micro-PANI/CC，同时以空白碳布(Carbon Cloth，CC)为基体制备了聚苯胺电极PANI/CC，并研究、比较了它们的电化学电容器性能. 使用XRD、SEM分析了所得电极的结构，结果显示电极Micro-PANI/CC表面具有大量的纳米孔状结构. 在0.5 mol·L-1硫酸为电解液的体系中测试了循环伏安、恒电流充放电、阻抗以及稳定性等特性，在扫速为2 mV·s-1 时，电极Micro-PANI/CC和PANI/CC的比电容分别为895.6 F·g-1和547.6 F·g-1，在其它测试条件相同的情况下，前者的比电容保持在后者的1.64倍以上，且具有更好的倍率特性、更低的电阻和较好的稳定性等特点，说明这种以HKUST-1为模板形成的多孔聚苯胺更适于超级电容器电极材料.Excellent electrode plays vital important role in the performance of supercapacitors. Polyaniline (PANI) with good conductivity is often used to prepare electrode. However, its available surface is limited and results in a poor supercapacitance in many cases. It is desirable to fabricate an electrode containing electroactive PANI with high surface area deriving from its porous structure. Here, the metal-organic framework (MOF) material with high surface area was selected as a hard template for synthesizing porous PANI. Microporous PANI composite electrodes (Micro-PANI/CC) were fabricated by depositing aniline on to carbon cloth (CC) pre-coated with MOF material of HKUST-1 using a unipolar pulse electro-polymerization method. At the same time, the PANI electrodes (PANI/CC) were also synthesized on blank carbon cloth for further comparatively studying their supercapacitor performances. Their microstructure and morphology were characterized by using XRD and SEM. Results indicate that the micro-PANI/CC electrode was composed of aggregated nanosized PANI spheres with pore structure. The cyclic voltammetry, constant current charge and discharge, impedance and stability tests were performed to evaluate the supercapacitor properties in 0.5 mol·L-1 sulfuric acid electrolyte. Specific capacitances of micro-PANI/CC and PANI/CC electrodes were 895.6 F·g-1 and 547.6 F·g-1 at scan rate of 2 mV·s-1 , respectively. At the same given conditions, the specific capacitance of micro-PANI/CC electrode was always 1.64 times higher than that of PANI/CC electrode. Meanwhile, the micro-PANI/CC electrode exhibited better rate capability, lower resistance and better stability of charge and discharge than PANI/CC. all the results imply that the microporous PANI templated from HKUST-1 could be a good candidate for the electrode of supercapacitors.