Pt overgrowth on carbon supported PdFe seeds in the preparation of core-shell electrocatalysts for the oxygen reduction reaction

Pt overgrowth on carbon supported PdFe seeds in the preparation of core-shell electrocatalysts for the oxygen reduction reaction
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碳负载 PdFe 晶种上 Pt 的过度生长用于制备氧还原反应的核壳电催化剂

DOI:
10.1016/j.jpowsour.2009.12.015
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发表时间:
2010-06
影响因子:
9.2
通讯作者:
雷自强
雷自强
中科院分区:
工程技术2区
文献类型:
--
作者:
雷自强

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在这项研究中,制备了一种新型核壳结构的Pd3Fe@Pt/C电催化剂,该催化剂基于沉积在碳负载的Pd3Fe纳米粒子上的Pt,用于质子交换膜燃料电池(PEMFC)中的氧还原反应(ORR)。碳负载的 Pd3Fe 纳米粒子充当种子来引导 Pt 的生长。通过透射电子显微镜(TEM)、X射线衍射(XRD)和电化学表征证实了核壳结构Pd3Fe@Pt/C的形成。合成催化剂的较高表面积表明 Pd3Fe@Pt/C 催化剂中 Pt 的利用率高于 Pt/C 中的利用率。此外,在遵循四电子路径的 ORR 中观察到比 Pt/C 和 Pd3Fe/C 催化剂更好的电催化性能。因此,结果表明 Pd3Fe@Pt/C 催化剂可以用作 PEMFC 的 ORR 的更经济可行的替代品。
In this study, a novel core–shell structured Pd3Fe@Pt/C electrocatalyst, which is based on Pt deposited onto carbon supported Pd3Fe nanoparticles, is prepared for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). The carbon supported Pd3Fe nanoparticles act as seeds to guide the growth of Pt. The formation of the core–shell structured Pd3Fe@Pt/C is confirmed by transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical characterization. The higher surface area of the synthesized catalyst suggests that the utilization of Pt in the Pd3Fe@Pt/C catalyst is higher than that in Pt/C. Furthermore, better electrocatalytic performance than that of Pt/C and Pd3Fe/C catalyst is observed in the ORR which follows a four-electron path. Consequently, the results indicate that the Pd3Fe@Pt/C catalyst could be used as a more economically viable alternative for the ORR of PEMFCs.
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