Pd@Pt Core–Shell Concave Decahedra: A Class of Catalysts for the Oxygen Reduction Reaction with Enhanced Activity and Durability

• DOI: 10.1021/jacs.5b10059
• Publication Date: 2015-11-13T18:38:27Z
• Authors: Xue Wang; Madeline Vara; Ming Luo; Hongwen Huang; Aleksey Ruditskiy; Jinho Park; Shixiong Bao; Jingyue Liu; Jane Howe; Miaofang Chi; Zhaoxiong Xie; Younan Xia
• Keywords: Deposition

We report a facile synthesis of multiply twinned Pd@Pt core–shell concave decahedra by controlling the deposition Pt on preformed Pd decahedral seeds. The atoms are initially deposited vertices seed, followed surface diffusion to other regions along edges/ridges and then across faces. Different from coating icosahedral prefer stay at seed even when is conducted 200 °C, naturally generating structure covered facets. nonuniformity in can be attributed presence twin boundaries vertices, as well {100} facets defects decahedron, effectively trapping adatoms these high-energy sites. As compared commercial Pt/C catalyst, show substantial enhancement both catalytic activity durability toward oxygen reduction reaction (ORR). For with 29.6% weight, their specific (1.66 mA/cm2Pt) mass (1.60 A/mgPt) ORR activities enhanced 4.4 6.6 times relative those catalyst (0.36 mA/cm2Pt 0.32 A/mgPt, respectively). After 10 000 cycles accelerated test, still exhibit 0.69 more than twice that pristine catalyst.