Direct room-temperature synthesis of a highly dispersed Pd nanoparticle catalyst and its electrical properties in a fuel cell
Direct room-temperature synthesis of a highly dispersed Pd nanoparticle catalyst and its electrical properties in a fuel cell
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DOI：
10.1016/j.powtec.2010.09.004
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发表时间：
2011-01-10
影响因子：
5.2
通讯作者：
Konishi, Yasuhiro
中科院分区：
文献类型：
--
作者：
Ogi, Takashi;Honda, Ryuichi;Konishi, Yasuhiro
利用金属离子还原菌希瓦氏菌（Shewanella oneidensis），通过微生物法成功制备了负载在细菌细胞上的高分散钯纳米粒子。休眠细胞S.当甲酸盐作为电子供体时，在室温和中性pH下，oneidensis在60分钟内将可溶性钯（II）还原为不溶性钯（0）。透射电子显微镜分析的薄切片S。在暴露于PdCl2溶液后的oneidensis细胞显示，大约510 nm大小的钯颗粒沉积在细菌表面和周质空间中。在前体溶液中可溶性钯（II）和甲酸盐的初始浓度强烈影响钯（II）的还原速率和生物质负载的钯颗粒的分散性。将干燥的生物质负载的钯作为阳极催化剂在聚合物电膜燃料电池中进行了测试，用于发电。高度分散的生物质负载的钯颗粒的最大发电量与商业钯催化剂的最大发电量相当。(C)2010爱思唯尔有限公司版权所有。
Highly dispersed palladium nanoparticles supported on bacterial cells were successfully prepared by a microbial method using the metal ion-reducing bacterium Shewanella oneidensis. Resting cells of S. oneidensis reduced soluble palladium(II) to insoluble palladium(0) at room temperature and neutral pH within 60 min when formate was provided as the electron donor. Transmission electron microscopy analysis of a thin section of S. oneidensis cells after exposure to a PdCl2 solution revealed that palladium particles approximately 510 nm in size were deposited on the bacterial surface and in the periplasmic space. The initial concentrations of soluble palladium(II) and formate in the precursor solution strongly influenced the rate of palladium(II) reduction and the dispersity of biomass-supported palladium particles. The dried biomass-supported palladium was tested as an anode catalyst in a polymer electric membrane fuel cell for power production. The maximum power generation of the highly dispersed biomass-supported palladium particles was comparable to that of a commercial palladium catalyst. (C) 2010 Elsevier B.V. All rights reserved.