Hierarchical Porous Carbon-PtPd Catalysts and Their Activity toward Oxygen Reduction Reaction.
Hierarchical Porous Carbon-PtPd Catalysts and Their Activity toward Oxygen Reduction Reaction.
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DOI：
10.1021/acsomega.2c01457
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发表时间：
2022-06-21
期刊：
影响因子：
4.1
通讯作者：
Maria Baena-Moncada, Angelica
中科院分区：
文献类型：
--
作者：
Marilu Arias-Pinedo, Ofelia;Cardenas Riojas, Andy A.;Pastor, Elena;Lopez, Elvis O.;Perez, Geronimo;Archanjo, Braulio S.;Ponce-Vargas, Miguel;Angel Planes, Gabriel;Maria Baena-Moncada, Angelica
将PtPd双金属催化剂负载在不同孔径的多孔碳载体上，用于燃料电池的氧还原反应。以纳米二氧化硅为模板，分别以287、371和425 nm为模板，控制HPC的孔径，得到三种HPC材料，分别记为HPC-1、HPC-2和HPC-3。用扫描电子显微镜、X射线光电子能谱、X射线衍射仪和高分辨电子显微镜对PtPd/HPC催化剂进行了表征。用循环伏安法和线性扫描伏安法对其电化学性能进行了测试。结果表明，PtPd/HPC-2催化剂的电活性为40.2m2·g~(-1)，在2 MV S~(-1)和1600rpm时的比电流密度为−1285A·g~(-1)。此外，我们进行了密度泛函理论计算研究，考察了PtPd团簇与HPC的石墨化结构域之间的相互作用，以及催化剂与氧分子之间的相互作用。这些结果揭示了决定电化学性能的传质过程中孔尺寸(HPC)和ESA值(PtPd纳米粒子)的强烈影响。
PtPd bimetallic catalysts supported on hierarchical porous carbon (HPC) with different porous sizes were developed for the oxygen reduction reaction (ORR) toward fuel cell applications. The HPC pore size was controlled by using SiO2 nanoparticles as a template with different sizes, 287, 371, and 425 nm, to obtain three HPC materials denoted as HPC-1, HPC-2, and HPC-3, respectively. PtPd/HPC catalysts were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy. The electrochemical performance was examined by cyclic voltammetry and linear sweep voltammetry. PtPd/HPC-2 turned out to be the most optimal catalyst with an electroactive surface area (ESA) of 40.2 m2 g–1 and a current density for ORR of −1285 A g–1 at 2 mV s–1 and 1600 rpm. In addition, we conducted a density functional theory computational study to examine the interactions between a PtPd cluster and a graphitic domain of HPC, as well as the interaction between the catalyst and the oxygen molecule. These results reveal the strong influence of the porous size (in HPC) and ESA values (in PtPd nanoparticles) in the mass transport process which rules the electrochemical performance.
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