Facile Construction of N‑Doped Graphene Supported Hollow PtAg Nanodendrites as Highly Efficient Electrocatalysts toward Formic Acid Oxidation Reaction

Hui Xu^†, Bo Yan^†,Shumin Li^†,Jin Wang^†, Caiqin Wang^‡, Jun Guo^§, and Yukou Du^*,†（杜玉扣）

^†College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Renai Road, Suzhou 215123, PR China

^‡Chemistry Department, University of Toronto, Toronto, Ontario M5S3H4, Canada

^§Testing & Analysis Center, Soochow University, 199 Renai Road, Jiangsu 215123, China

ACS Sustainable Chem. Eng.2018,6(1), 609--617

The lack of cost-efficient catalysts for the electrooxidation of fuel in the anodic electrode has been a major barrierfor the practical large-scale commercial application and hence needs to be optimized. Tuning the morphologies and structures ofPt-based bimetallic nanostructure plays a key role in controlling its interaction with reactants, and thus affects its electrocatalyticefficiency. In this regard, endowing the nanocatalysts with both of high surface active areas and controlled facets throughmodifying their surface compositions and morphologies can significantly enhance their electrocatalytic performances. To thisend, we herein demonstrate a facile wet-chemical method to successfully construct the N-doped graphene supported hollow PtAgnanodendrites under the assistance of ultrasonic treatment. More importantly, the resulting N-doped graphene supported hollowPtAg nanodendrites show high performance for the electrooxidation of formic acid with the mass and specific activities of 1258.5mA mg^-1 and 6.14 mA cm^-2, 3.77 and 1.57-fold enhancements than those of commercial Pt/C, respectively. It is believed thatthe as-prepared nanomaterials can be well-applied to serve as the highly efficient anode electrocatalysts for the commercialapplication of fuel cells and beyond.

链接：http://pubs.acs.org/doi/10.1021/acssuschemeng.7b02935