High oxygen-reduction activity of silk-derived activated carbon
High oxygen-reduction activity of silk-derived activated carbon
复制标题
DOI：
10.1016/j.elecom.2008.11.045
复制
发表时间：
2009-02-01
影响因子：
5.4
通讯作者：
Takasu, Yoshio
中科院分区：
文献类型：
--
作者：
Iwazaki, Tomoya;Obinata, Ryoujin;Takasu, Yoshio
由丝素蛋白制备的活性炭不含金属元素，对氧还原反应（ORR）表现出较高的催化活性。活性炭在60 ℃下在氧饱和的0.5M H2SO 4中具有非常高的起始电位，E-起始= 0.83V（相对于RHE）。在活性炭上的ORR在高电极电位区域中通过四电子过程进行;这逐渐降低到低于约0.6 V（vs. RHE）的3.5电子反应。只有约1%的氮原子（主要是四元）通过在高达1200摄氏度的热处理保留在活性炭中，这是高催化活性的原因。使用活性炭作为阴极和铂/炭黑阳极的聚合物电解质燃料电池在纯氧和氢气下分别在一个大气压下的开路电压在27 ℃下为0.96V。(C)2008 Elsevier B. V.保留所有权利。
Activated carbon prepared from silk fibroin, which is free of metal elements, showed a high catalytic activity for the oxygen-reduction reaction (ORR). The activated carbon had a very high onset potential of E-onset = 0.83 V (vs. RHE) in oxygen-saturated 0.5 M H2SO4 at 60 degrees C. The ORR on the activated carbon proceeded by a four-electron process in the high-electrode-potential region; this gradually decreased to a 3.5-electron reaction below about 0.6 V (vs. RHE). Only about 1% of nitrogen atoms (mostly quaternary) remained in the activated carbon by heat-treatment at up to 1200 degrees C are responsible for the high catalytic activity. The open circuit voltage of a polymer electrolyte fuel cell using the activated carbon as the cathode and a platinum/carbon black anode under pure oxygen and hydrogen gases, respectively, both at one atmosphere, was 0.96 V at 27 degrees C. (C) 2008 Elsevier B.V. All rights reserved.