Spiny Pd/PtFe core/shell nanotubes with rich high-index facets for efficient electrocatalysis

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: ARTICLES
• 页码范围: 44-51
• 页数: 8页
• 语种: 英文

摘要

The performance of fuel-cell related electrocatalysis is highly dependent on the morphology,size and composition of a given catalyst.In terms of rational design of Pt-based catalyst,one-dimensional(1D)ultrafine Pt alloy nanowires(NWs)are considered as a commendable model for enhanced catalysis on account of their favorable mass/charge transfer and structural durability.However,in order to achieve the noble metal catalysts in higher efficiency and lower cost,building high-index facets and shaping hol-low interiors should be integrated into 1D Pt alloy NWs,which has rarely been done so far.Here,we report the first synthesis of a class of spiny Pd/PtFe core/shell nanotubes(SPCNTs)constructed by culti-vating PtFe alloy branches with rich high-index facets along the 1D removable Pd supports,which is dri-ven by the galvanic dissolution of Pd substrates concomitant with Stranski-Krastanov(S-K)growth of Pt and Fe,for achieving highly efficient fuel-cells-related electrocatalysis.This new catalyst can even deliver electrochemical active surface area(ECSA)of 62.7 m2 gPt1,comparable to that of commercial carbon-supported Pt nanoparticles.With respect to oxygen reduction catalysis,the SPCNTs showcase the remarkable mass and specific activity of 2.71 A mg-1 and 4.32 mA cm-2,15.9 and 16.0 times higher than those of commercial Pt/C,respectively.Also,the catalysts exhibit extraordinary resistance to the activity decay and structural degradation during 50,000 potential cycles.Moreover,the SPCNTs serve as a cate-gory of efficient and stable catalysts towards anodic alcohol oxidation.