Liu Hongpo, Zhong Ping, Liu Kai, Han Lu, Zheng Haoquan, Yin Yadong, Gao Chuanbo
Center for Materials Chemistry , Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710054 , China . Email:
School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China.
Chem Sci. 2017 Oct 30;9(2):398-404. doi: 10.1039/c7sc02997g. eCollection 2018 Jan 14.
Ultrathin Pt nanostructures exposing controlled crystal facets are highly desirable for their superior activity and cost-effectiveness in the electrocatalytic oxygen reduction reaction (ORR), and they are conventionally synthesized by epitaxial growth of Pt on a limited range of templates, such as Pd nanocrystals, resulting in a high cost and less structural diversity of the ultrathin Pt nanostructures. To solve this problem, we demonstrate that ultrathin Pt nanostructures can be synthesized by templating conveniently available Ag nanocrystals without involving galvanic replacement, which enables a much-reduced cost and controllable new morphologies, such as ultrathin Pt nanoplates that expose the {111} facets. The resulting ultrathin Pt nanoplates are ∼1-2 nm in thickness, which show an ∼22-fold increase in specific activity (5.3 mA cm), an ∼9.5-fold increase in mass activity (1.62 A mg) and significantly enhanced catalytic stability in the ORR, compared with the commercial Pt/C catalyst. We believe this strategy opens a door to a highly extendable family of ultrathin noble metal nanostructures, thus promising excellent activity and stability in a broad range of catalytic applications.
暴露可控晶面的超薄铂纳米结构因其在电催化氧还原反应（ORR）中具有卓越的活性和成本效益而备受青睐，传统上它们是通过在有限种类的模板（如钯纳米晶体）上外延生长铂来合成的，这导致超薄铂纳米结构成本高昂且结构多样性较低。为了解决这个问题，我们证明了超薄铂纳米结构可以通过以易于获得的银纳米晶体为模板来合成，而无需进行置换反应，这使得成本大幅降低，并能实现可控的新形态，例如暴露{111}晶面的超薄铂纳米片。所得的超薄铂纳米片厚度约为1 - 2纳米，与商业铂碳催化剂相比，其比活性（5.3 mA cm）提高了约22倍，质量活性（1.62 A mg）提高了约9.5倍，并且在ORR中催化稳定性显著增强。我们相信这种策略为一个高度可扩展的超薄贵金属纳米结构家族打开了一扇门，因此有望在广泛的催化应用中展现出优异的活性和稳定性。
