Synthesis of Bimetallic Pt–Ru Nanoparticles by Bioreduction Using Shewanella algae for Application to Direct Methanol Fuel Cell

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Hiroyuki Yamanaka²  Yasuhiro Konishi¹  Yuta Nakanishi²  Hajime Tamon²  Noriaki Sano²  Norizo Saito¹  Kazuki Sugiura² 

[1] Department of Chemical Engineering, Osaka Prefecture University;Department of Chemical Engineering, Kyoto University

关键词: Bioreduction;    Nanoparticle;    Alloy;    Direct Methanol Fuel Cell;   

DOI  :  10.1252/jcej.15we077

来源: Maruzen Company Ltd

【 摘 要 】

References(14)Bimetallic Pt–Ru nanoparticles were successfully synthesized using a reducing bacterium, Shewanella algae (S. algae), by the bioreduction of Pt(IV) and Ru(III) in an aqueous solution, where H2PtCl6 and RuCl3 were dissolved. These bimetallic nanoparticles were expected to be preferably used as catalyst in a direct methanol fuel cell (DMFC) because inactivation of their catalytic activity can be avoided by the effect of Ru to remove CO from Pt surface. In this study, two patterns in mixing procedure of H2PtCl6 and RuCl3 were compared for the synthesis of the catalyst particles by the bioreduction. The open circuit voltage was monitored at a DMFC using the electrodes with catalyst nanoparticles synthesized by the bioreduction of S. algae. Continuous inactivation of the catalytic activity of the nanoparticles was observed when the nanoparticles were synthesized with continuous admixture of RuCl3 to H2PtCl6 during the bioreduction or without RuCl3. On the other hand, the inactivation was stopped to preserve the open-circuit voltage when H2PtCl6 and RuCl3 were mixed prior to the bioreduction. This feature which is preferable for DMFC can be ascribed to alloying Ru with Pt in the resulted nanoparticles. It is remarkable that Ru(III) which is hardly reduced by S. algae due to its relatively low standard electrode potential can be alloyed with Pt to produce the bimetallic Pt–Ru nanoparticles in the present condition.

【 授权许可】

Unknown