Comparative study on the performance of pyrolyzed and plasma-treated iron(II) phthalocyanine-based catalysts for oxygen reduction in pH neutral electrolyte solutions
Comparative study on the performance of pyrolyzed and plasma-treated iron(II) phthalocyanine-based catalysts for oxygen reduction in pH neutral electrolyte solutions
复制标题
DOI：
10.1016/j.jpowsour.2008.12.049
复制
发表时间：
2009-08-01
影响因子：
9.2
通讯作者：
Schroeder, Uwe
中科院分区：
文献类型：
--
作者：
Harnisch, Falk;Savastenko, Natalie A.;Schroeder, Uwe
结合非贵金属催化剂在微生物燃料电池中的应用，讨论了热解和等离子体处理的非贵金属催化剂的氧还原性能。采用Ar-射频(RF)等离子体处理来提高铁(II)-酞菁(FePc)基催化剂的电化学活性。通过电流动态线性扫描伏安法和计时电流法对催化剂的电化学性质进行了分析。用X射线光电子能谱(XPS)对催化剂进行了表面元素分析。考察了等离子体功率和处理时间对催化剂表面元素浓度和性能的影响。以0V电流密度表示的电化学活性，等离子体处理的样品比热解样品高出40%。结果表明，FePc基催化剂的最佳处理时间为30min，最佳等离子体功率为150W。从XPS数据可以看出，Ar等离子体处理使催化剂表面的氧和氮浓度增加。发现催化剂的活性与催化剂表面氧和氮的表面浓度之间存在相关性。(C)2008爱思唯尔B.V.保留所有权利。
The performance of pyrolyzed and plasma-treated non-precious catalysts for the oxygen reduction is discussed in the light of their application in microbial fuel cells. An Ar-radio frequency (RF) plasma treatment is applied to enhance the electrochernical activity of iron(II) phthalocyanine (FePc)-based catalysts. The electrochemical properties of the catalysts are analyzed by galvanodynamic linear sweep voltammetry and chronoamperometric experiments. Surface elemental analysis of the catalysts is examined by means of X-ray photoelectron spectroscopy (XPS). The influence of plasma power and treatment time on the elemental surface concentration and performance of the catalysts is investigated. The electrochemical activity, expressed in terms of the current density at 0 V vs. Ag/AgCl, is up to 40% higher for the plasma-treated samples than for pyrolyzed ones. It is found that optimal treatment time was 30 min and optimal plasma power was 150W for the best electroactivity of FePc-based catalysts. From the results of XPS data, it is revealed that Ar-plasma treatment of the catalysts leads to an increase in the oxygen and nitrogen concentration on the catalysts surface. A correlation is found between the activity and surface concentration of oxygen and nitrogen on the catalysts' surface. (C) 2008 Elsevier B.V. All rights reserved.