Highly uniform platinum nanoparticles supported on graphite nanoplatelets as a catalyst for proton exchange membrane fuel cells
Highly uniform platinum nanoparticles supported on graphite nanoplatelets as a catalyst for proton exchange membrane fuel cells
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DOI：
10.1016/j.ijhydene.2013.08.033
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发表时间：
2013-10
影响因子：
7.2
通讯作者：
G. Xia;Chengde Huang;Yuxin Wang
中科院分区：
文献类型：
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作者：
G. Xia;Chengde Huang;Yuxin Wang
由石墨烯层组成的石墨纳米片（GNP）是理想的电催化剂载体，这是由于它们的高导电性和导热性、优异的化学稳定性和容易获得。然而，GNP在某种程度上是化学惰性的，这使得催化金属纳米颗粒在其表面上的均匀沉积变得困难。在本文中，我们提出了一种简便的方法来制备高度均匀的铂纳米颗粒的GNP，这是装饰1-芘羧酸（PCA）。当PCA的疏水性芘基团通过π-π相互作用吸附在GNP表面时，其羧基可以作为Pt沉积的锚。这种装饰有利于Pt纳米颗粒的窄尺寸分布，其中心在约2-3 nm，以及在GNP表面上的均匀空间分布。所得Pt/GNP催化剂表现出比常用Pt/C催化剂显著更高的耐久性和电化学活性，因此是一种有前途的质子交换膜燃料电池阴极催化剂。
Graphite nanoplatelets (GNPs), which consist of layers of graphene, are an ideal electrocatalyst support due to their high electrical and thermal conductivity, excellent chemical stability, and easy availability. However, GNPs are somewhat chemically inert, which makes the even deposition of catalytic metal nanoparticles on their surface difficult. In this paper, we present a facile method to prepare highly uniform Pt nanoparticles on GNPs, which are decorated with 1-pyrenecarboxylic acid (PCA). When the hydrophobic pyrene group of the PCA is adsorbed on the surface of GNPs via π–π interaction, its carboxylic group can serve as an anchor for the Pt deposition. This decoration facilitates a narrow size profile, which is centered at approximately 2–3 nm, and an even spatial distribution on the GNPs surface for the Pt nanoparticles. The resultant Pt/GNPs catalyst exhibits a noticeably higher durability and electrochemical activity than the commonly used Pt/C catalyst and is therefore a promising cathodic catalyst for proton exchange membrane fuel cells.