摘要
以脉冲电流法制备的纳米纤维状聚苯胺(PANI)为Pt催化剂载体,用它制备了甲醇阳极氧化的催化电极Pt/(nano-fibularPANI).研究结果表明,Pt/(nano-fibularPANI)电极对甲醇氧化具有很好的电催化活性,并有协同催化作用.在相同的Pt载量条件下,Pt/(nano-fibularPANI)电极比Pt微粒修饰的颗粒状聚苯胺电极Pt/(granularPANI)具有更好的电催化活性.此外,Pt的电沉积修饰方法同样影响Pt/(nano-fibularPANI)电极对甲醇氧化的催化活性.脉冲电流法沉积Pt形成的复合电极较循环伏安法电沉积得到的Pt复合电极具有更优异的催化活性.
Nano fibular polyaniline(PANI) film with large specific surface area was prepared by pulse galvanostatic method(PGM) and the electrode of nano fibular PANI modified by Pt microparticles[Pt/(nano fibular PANI)] was used as the catalyzed electrode for methanol oxidation in this paper. The research results show that there is a synergism for methanol oxidation on Pt/(nano fibular PANI) electrode. The Pt/(nano fibular PANI)electrode exhibits a considerably higher electrocatalytic activity on methanol oxidation than that of the Pt/(granular PANI) electrode when Pt is deposited by cyclic voltammetry method(CVM). The catalytic activity of Pt/(nano fibular PANI) electrode is 8 times higher than that of Pt/(granular PANI) electrode under the condition of Pt loading of 800 μ g· cm- 2. Moreover, the research results show that the catalytic activity of Pt/PANI electrode can be further improved when Pt is deposited by PGM. The results of scanning electron microscopy(SEM) show that a large number of Pt microparticles with diameter of about 30 nm are dispersed homogeneously on nano fibular PANI with diameter about 100 nm. This leads to an increase in specific surface area and dispersion of Pt and hence results in a high catalytic activity of the Pt/PANI composite electrode. The results of electrochemical impedance spectroscopy(EIS) show that the Pt/(nano fibular PANI) electrode has relatively lower electrochemical impedance for methanol oxidation than that of the Pt/(granular PANI) electrode.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2004年第1期9-14,共6页
Acta Physico-Chimica Sinica
基金
化学生物传感与计量学国家重点实验室基金(2002-01)资助项目~~
关键词
铂微粒修饰
纳米纤维聚苯胺电极
甲醇氧化
电化学催化
电沉积
Nano fibular polyaniline, Electrodepositing Pt microparticles, Methanol oxidation, Electrocatalysis
