Amorphous nickel boride membrane on a platinum-nickel alloy surface for enhanced oxygen reduction reaction.
Amorphous nickel boride membrane on a platinum-nickel alloy surface for enhanced oxygen reduction reaction.
复制标题
铂镍合金表面非晶硼化镍膜增强氧还原反应
DOI：
10.1038/ncomms12362
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发表时间：
2016-08-09
影响因子：
16.6
通讯作者：
Li Y
中科院分区：
文献类型：
--
作者：
He D;Zhang L;He D;Zhou G;Lin Y;Deng Z;Hong X;Wu Y;Chen C;Li Y
聚合物电解质膜燃料电池中氧还原反应的低活性是电催化的主要障碍，因此需要优化。铂基铂合金是一种很有前途的氧还原催化剂，其表面电子结构的调整对控制其与反应物的相互作用起着关键作用，从而影响着氧还原反应的效率。在这里，我们报告了一个去合金化的过程中，可以利用实验制造脱合金铂镍合金和非晶硼化镍膜之间的界面。涂层膜作为电子受体调节铂-镍催化剂的表面电子结构，并且这种由结晶铂-镍覆盖无定形硼化镍组成的复合催化剂在0.9 V下相对于商业铂/碳实现了27倍的质量活性增强，用于氧还原反应性能。此外，结晶表面和无定形膜之间的这种插入效应可以容易地推广到促进商业铂/碳的3倍更高的催化活性。
The low activity of the oxygen reduction reaction in polymer electrolyte membrane fuel cells is a major barrier for electrocatalysis, and hence needs to be optimized. Tuning the surface electronic structure of platinum-based bimetallic alloys, a promising oxygen reduction reaction catalyst, plays a key role in controlling its interaction with reactants, and thus affects the efficiency. Here we report that a dealloying process can be utilized to experimentally fabricate the interface between dealloyed platinum–nickel alloy and amorphous nickel boride membrane. The coating membrane works as an electron acceptor to tune the surface electronic structure of the platinum–nickel catalyst, and this composite catalyst composed of crystalline platinum–nickel covered by amorphous nickel boride achieves a 27-times enhancement in mass activity relative to commercial platinum/carbon at 0.9 V for the oxygen reduction reaction performance. Moreover, this interactional effect between a crystalline surface and amorphous membrane can be readily generalized to facilitate the 3-times higher catalytic activity of commercial platinum/carbon.