Facile synthesis of porous dendritic Pt<inf>68</inf>Ag<inf>32</inf>nanodandelions for greatly boosting electrocatalytic activity towards oxygen reduction and hydrogen evolution

Key Words:Catalyst activity;Binary alloys - Chlorine compounds - Cost engineering - Electrolytic reduction - Ionic liquids - Nanocrystals - Oxygen - Platinum - Silver compounds;Amrinone - Characterization techniques - Electrocatalytic activity - Electrochemically active surface areas - Enhanced catalytic activity - Hydrogen evolution reactions - Oxygen reduction reaction - Porous dendritic nanodandelions

Abstract:Contrary to single counterparts, Pt-based bimetallic nanocrystals are attractive and feasible to decrease the cost, improve the catalytic activity and enhance the stability via morphology-, structure- and composition-engineering. Herein, porous dendritic alloyed Pt<inf>68</inf>Ag<inf>32</inf>nanodandelions (NDs) were synthesized by a one-pot successive co-reduction method, using amrinone as the new stabilizer and structure director, without any template, seed or complicated instrument. The correlative shapes, composition, and crystalline structure were examined by a range of characterization techniques. It is found that the molar ratio of the precursors (AgNO<inf>3</inf>and H<inf>2</inf>PtCl<inf>6</inf>), the dosage of amrinone, and different reductants play the essential roles during the synthesis process. The Pt<inf>68</inf>Ag<inf>32</inf>NDs exhibited dramatically enlarged electrochemically active surface area, enhanced catalytic activity and stability for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) as compared to commercial Pt/C, Pt black, home-made Pt<inf>75</inf>Ag<inf>25</inf>nanocrystals (NCs) and Pt<inf>56</inf>Ag<inf>44</inf>NCs catalysts.<br/> &copy; 2018 Hydrogen Energy Publications LLC

Volume:43

Issue:12

Translation or Not:no