Carbon-supported AuPd bimetallic nanoparticles synthesized by high-energy electron beam irradiation for direct formic acid fuel cell
Carbon-supported AuPd bimetallic nanoparticles synthesized by high-energy electron beam irradiation for direct formic acid fuel cell
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DOI：
10.1007/s10853-012-6989-7
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发表时间：
2013-03
影响因子：
4.5
通讯作者：
Y. Ohkubo;M. Shibata;Satoru Kageyama;S. Seino;T. Nakagawa;J. Kugai;H. Nitani;T. Yamamoto
中科院分区：
文献类型：
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作者：
Y. Ohkubo;M. Shibata;Satoru Kageyama;S. Seino;T. Nakagawa;J. Kugai;H. Nitani;T. Yamamoto
用高能电子束辐照水溶液中的前驱体离子还原制备了直接甲酸燃料电池(DFAFC)阳极用碳负载Pd(Pd/C)和碳负载AuPd(AuPd/C)纳米粒子催化剂。我们得到了三种纳米催化剂：(1)Pd/C，(2)核壳结构的AuPd/C，(3)合金结构的AuPd/C。通过添加柠檬酸作为络合剂，氢氧化钠作为pH调节剂来控制AuPd纳米粒子的结构。用透射电子显微镜、电感耦合等离子体原子发射光谱、X射线衍射仪和X射线吸收精细结构技术对纳米催化剂的结构进行了表征。用线性扫描伏安法评价了甲酸氧化的催化活性。Au/C的氧化电流值高于Pd/C，说明Au的加入提高了DFAFC阳极的氧化活性。此外，合金结构的AuPd/C比核壳结构的AuPd/C具有更高的氧化活性。控制AuPd混合态对提高甲酸氧化活性是有效的。
Nanoparticle catalysts of carbon-supported Pd (Pd/C) and carbon-supported AuPd (AuPd/C) for the direct formic acid fuel cell (DFAFC) anode were synthesized by the reduction of precursor ions in an aqueous solution irradiated with a high-energy electron beam. We obtained three kinds of nanoparticle catalysts: (1) Pd/C, (2) AuPd/C of the core–shell structure, and (3) AuPd/C of the alloy structure. The structures of AuPd nanoparticles were controlled by the addition of citric acid as a chelate agent, and sodium hydroxide as a pH controller. The structures of nanoparticle catalysts were characterized using transmission electron microscopy, inductively coupled plasma atomic emission spectrometry, the techniques of X-ray diffraction and X-ray absorption fine structure. The catalytic activity of the formic acid oxidation was evaluated using linear sweep voltammetry. The oxidation current value of AuPd/C was higher than that of Pd/C. This indicated that the addition of Au to Pd/C improved the oxidation activity of the DFAFC anode. In addition, the AuPd/C of the alloy structure had higher oxidation activity than the AuPd/C of the core–shell structure. The control of the AuPd mixing state was effective in enhancing the formic acid oxidation activity.