标题：Facile synthesis of Pt nanoparticles loaded porous graphene towards oxygen reduction reaction
作者：Zhang, Yan; Liu, Hening; Wu, Haikun; Sun, Zhongyu; Qian, Lei
作者机构：[Zhang, Yan; Liu, Hening; Wu, Haikun; Sun, Zhongyu; Qian, Lei] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, 17923 Jingsh 更多
通讯作者地址：[Qian, L]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, 17923 Jingshi Rd, Jinan 250061, Peoples R China.
来源：MATERIALS & DESIGN
关键词：Porous graphene; Pt nanoparticles; Oxygen reduction reaction; Freeze; drying
摘要：A facile method was developed to fabricate Pt nanoparticles loaded porous graphene (Pt-PGR) composites via impregnation and reduction. The PGR was first immersed into a H2PtCl6 ethanol solution, and then the H2PtCl6 was reduced to Pt nanoparticles with NaBH4 to produce the Pt-PGR composites. Morphologies and composition of the Pt-PGR composites were characterized by filed-emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and nitrogen physisorption. It was found that the obtained Pt-PGR composites had three-dimensional interpenetrating porous structure, and the Pt nanoparticles from 50 to 150 nm uniformly distributed on the graphene surfaces. Electrochemical and electrocatalytical properties of the Pt-PGR composite were investigated by cyclic voltammogram and linear sweep voltammogram. The results indicated that the Pt-PGR composites had excellent catalytical activity towards the oxygen reduction reaction (ORR), and showed the higher diffusion-limited current densities (4.0 mA cm(-2) and 25 mA mg(pt)(-1) at -0.6 V) and stability compared with the commercial 20% Pt/C catalyst. The electrocatalytical kinetics experiments showed that the electron transfer number was 3.6 calculated from the Koutecky-Levich plot, indicating an approximate four-electron process and the oxygen directly reduced to water for the ORR. (C) 2016 Elsevier Ltd. All rights reserved.