Wang Chen-Hao, Hsu Hsin-Cheng, Wang Kai-Ching
Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 10607 Taipei, Taiwan.
Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 10607 Taipei, Taiwan.
J Colloid Interface Sci. 2014 Aug 1;427:91-7. doi: 10.1016/j.jcis.2013.11.068. Epub 2013 Dec 14.
Carbon-supported Pt, Pd, Pd-Pt core-shell (Pt(shell)-Pd(core)/C) and Ir-decorated Pd-Pt core-shell (Ir-decorated Pt(shell)-Pd(core)/C) catalysts were synthesized, and their physical properties, electrochemical behaviors, oxygen reduction reaction (ORR) characteristics and proton exchange membrane fuel cell (PEMFC) performances were investigated herein. From the XRD patterns and TEM images, Ir-decorated Pt(shell)-Pd(core)/C has been confirmed that Pt was deposited on the Pd nanoparticle which had the core-shell structure. Ir-decorated Pt(shell)-Pd(core)/C has more positive OH reduction peak than Pt/C, which is beneficial to weaken the binding energy of Pt-OH during the ORR. Thus, Ir-decorated Pt(shell)-Pd(core)/C has higher ORR activity than Pt/C. The maximum power density of H2-O2 PEMFC using Ir-decorated Pt(shell)-Pd(core)/C is 792.2 mW cm(-2) at 70°C, which is 24% higher than that using Pt/C. The single-cell accelerated degradation test of PEMFC using Ir-decorated Pt(shell)-Pd(core)/C shows good durability by the potential cycling of 40,000 cycles. This study concludes that Ir-decorated Pt(shell)-Pd(core)/C has the low Pt content, but it can facilitate the low-cost and high-efficient PEMFC.
合成了碳载铂、钯、钯 - 铂核壳（Pt（壳）-Pd（核）/C）和铱修饰的钯 - 铂核壳（铱修饰的Pt（壳）-Pd（核）/C）催化剂，并在此研究了它们的物理性质、电化学行为、氧还原反应（ORR）特性和质子交换膜燃料电池（PEMFC）性能。从XRD图谱和TEM图像可知，铱修饰的Pt（壳）-Pd（核）/C已证实铂沉积在具有核壳结构的钯纳米颗粒上。铱修饰的Pt（壳）-Pd（核）/C比Pt/C具有更正的OH还原峰，这有利于在ORR过程中削弱Pt-OH的结合能。因此，铱修饰的Pt（壳）-Pd（核）/C比Pt/C具有更高的ORR活性。使用铱修饰的Pt（壳）-Pd（核）/C的H2 - O2 PEMFC在70°C时的最大功率密度为792.2 mW cm(-2)，比使用Pt/C时高24%。使用铱修饰的Pt（壳）-Pd（核）/C的PEMFC的单电池加速降解测试通过40,000次循环的电位循环显示出良好的耐久性。本研究得出结论，铱修饰的Pt（壳）-Pd（核）/C具有低铂含量，但它可以促进低成本和高效的PEMFC。
