Intermetallic PtBi Nanoplates Boost Oxygen Reduction Catalysis with Superior Tolerance over Chemical Fuels
Intermetallic PtBi Nanoplates Boost Oxygen Reduction Catalysis with Superior Tolerance over Chemical Fuels
复制标题
金属间 PtBi 纳米板可增强氧还原催化作用，且比化学燃料具有更高的耐受性
DOI：
10.1002/advs.201800178
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发表时间：
2019-09-30
期刊：
影响因子：
15.1
通讯作者：
Huang, Xiaoqing
中科院分区：
文献类型：
--
作者：
Feng, Yonggang;Shao, Qi;Huang, Xiaoqing
小分子有机燃料的交叉问题通常使铂基纳米催化剂在实际燃料电池运行条件下表现出效率低、耐受性和耐久性差的特点。本文报道了一种新的制备金属间化合物六方PtBi纳米板的方法，该纳米板具有比化学燃料更好的耐受性，以增强氧还原催化作用。与时间相关的形貌研究表明，由一种新的反应中间体(三角形/截断三角形氧化铋纳米片)转变成了定义良好的六方PtBi纳米片。与传统的铂基催化剂不同，六方PtBi纳米板材对CH3OH、HCOOH和CO的耐受性有很大提高。X射线光电子能谱分析表明，铂铋键引起的电荷位移是提高耐受性的主要因素。与所有已报道的PtBi纳米颗粒相比，PtBi板也表现出更高的ORR活性。由于其优异的抗中毒能力和高活性，这些六方纳米板在商业燃料电池的发展中显示出巨大的潜力。
The crossover issue of small-molecule organic fuels usually makes the Pt-based nanocatalysts exhibit low efficiency, and poor tolerance and durability under the practical fuel cell operating conditions. Here, a new approach to prepare a class of intermetallic hexagonal PtBi nanoplates with superior tolerance over chemical fuels for boosting oxygen reduction catalysis is reported. The time-dependent morphology studies reveal that the well-defined hexagonal PtBi nanoplates are transformed from a new reaction immediate (triangular/truncated triangular bismuth oxides nanoplates). Different from conventional Pt-based catalysts, the hexagonal PtBi nanoplates exhibit much improved tolerance over CH3OH, HCOOH, and CO. X-ray photoelectron spectroscopy results reveal that the charge displacement resulting from Pt-Bi bonding is the main factor in enhancing the tolerance. The PtBi nanoplates also exhibit much higher ORR activity than all the reported PtBi nanoparticles. Considering their exceptional antipoisoning ability and high activity, these hexagonal nanoplates show great potential in the development of commercial fuel cells.