中文摘要：

以壳聚糖（CS）为吸附剂和成膜剂,Keggin型铁取代杂多阴离子PW_（11）O_（39）Fe（Ⅲ）（H_2O）~（4-）（PW_（11）Fe）为电催化剂,碳纳米管（CNTs）为导电助剂,集成吸附法和溶胶-凝胶法将PW_（11）Fe固载在石墨电极表面制备了PW_（11）Fe/CS/CNTs/C复合膜电极,并用电化学方法研究了该电极的电化学行为及其影响因素,同时研究了电极对H_2O_2还原的电催化活性及作为H_2O_2电化学传感器的可能性。实验结果表明,PW_（11）Fe/CS/CNTs/C复合膜电极具有PW_（11）Fe类似的电化学行为及对H_2O_2还原的电催化活性,用于H_2O_2的安培检测,电流响应灵敏度为0.30 mA·cm~（-2）·（μmol/L）~（-1）,检出限为7.3μmol/L（S/N=3）。

英文摘要：

A composite film electrode PW_（11）Fe/CS/CNTs/C was prepared by the integration of adsorption method and sol-gel method using chitosan as both an adsorbent and film-forming agent,Keggin type Fe（Ⅲ）-substituted heteropolyanion PW_（11）O_（39）Fe（Ⅲ）（H_2O）~（4-）（PW_（11）Fe） as an electrocatalyst,carbon nano tubes（CNTs） as a conductivity improver in this paper.The electrochemical behavior and its influence factors of the as-prepared electrode were investigated by using the electrochemical method.The electrocatalytic activity towards H_2O_2 reduction and the possibility also used to be an electrochemical sensor detecting H_2O_2 were evaluated.The results showed that the PW_（11）Fe/CS/CNTs/C composite film electrode possessed a similar electrochemical behavior with PW_（11） Fe and a high electrocatalytic activity towards H_2O_2 reduction.For detecting H_2O_2 reduction.Applied to detect H_2O_2,the electrode exhibits a high sensitivity of 0.30 mA·cm~（-2）·（μmol/L）~（-1） and a detection limit of 7.3 μmol/L（S/N=3）.