钯镍/碳纳米管复合物对乙醇氧化的电活性  

Electroactivity of PdNi/CNTs composite for ethanol oxidation

作　　者：孙丽枝[1] 易清风[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《电源技术》2013年第5期763-766,共4页Chinese Journal of Power Sources

基　　金：湖南省自然科学省市联合基金(10JJ9003);湖南省高校创新平台开放基金(11K023);湖南省发委科技基本建设项目(20101060)

摘　　要：采用电沉积法,在Ti电极以及多壁碳纳米管(MWCNTs)修饰的Ti电极(MWCNT/Ti)上电沉积Pd和PdNi纳米颗粒,制备PdNi/MWCNT/Ti、Pd/MWCNT/Ti和PdNi/Ti复合催化剂。扫描电子显微镜(SEM)显示,MWCNT负载的纳米颗粒有较好的分散程度。循环伏安(CV)结果表明,PdNi/MWCNT/Ti电极上乙醇阳极氧化峰电流密度(23.44mA/cm2)大大高于PdNi/Ti、Pd/MWCNT/Ti电极,其交换电流密度为23.86×10-7A/cm2,是Pd/MWCNT/Ti(0.65×10-7A/cm2)催化剂的37倍。经过3600s恒电位电解,在PdNi/MWCNT/Ti电极上乙醇氧化的电流密度是在Pd/MWCNT/Ti电极上的2倍,说明PdNi/MWCNT/Ti对乙醇氧化具有较稳定的电催化活性。交流阻抗(EIS)测试表明,PdNi/MWCNT/Ti电极在碱性溶液中对乙醇氧化具有较低的电荷传递电阻。实验结果表明适量镍的掺杂不但增强了催化剂对乙醇催化氧化的活性,而且提高了催化剂的稳定性。通过PdNi/MWCNT与PdNi对乙醇的电化学氧化的催化活性的比较,也说明MWCNT是一类很好的催化剂载体。Pd and PdNi nanoparticles were electrodeposited on the Ti and multi-walled carbon nanotubes （MWCNTs）- modified Ti electrodes to synthesize PdNi/MWCNT/Ti, Pd/MWCNT/-Ii and PdNi/Ti composite catalysts. SEM image shows that nanoparticles on the PdNi/MWCNT/Ti were well dispersed. Cyclic voltammetric （CV） results show that, compared with PdNi/Ti and Pd/MWCNT/Ti catalysts, Pd/MWCNT/Ti catalyst presents the highest anodic current density of 23.44 mA/cmE The exchange current density of ethanol oxidation on the PdNi/MWCNTFI＇i is 37 times higher than that on the Pd/MWCNT/Ti. Chronoamperometric responses show that the PdNi/MWCNT/Ti presents a more stable and higher current density of ethanol oxidation than the Pd/MWCNT/Ti. Very low charge transfer resistances on the PdNi/MWCNT/Ti for ethanol oxidation were obtained according to the analysis for electrochemical impedance spectra （EIS）. Results show that the MWCNT supported PdNi （PdNi/MWCNT） catalyst exhibits higher activity and stability for ethanol oxidation. The higher electroactivity of the PdNi/MWCNT/Ti for ethanol oxidation than the PdNi/Ti indicated that MWCNT was an outstanding catalyst support.

关 键 词：PdNi MWCNT Ti 电沉积 多壁碳纳米管 乙醇氧化 钯电极 

分 类 号：TM911.4[电气工程—电力电子与电力传动]