Addition of rhenium (Re) to Pt-Ru/f-MWCNT anode electrocatalysts for enhancement of ethanol electrooxidation in half cell and single direct ethanol fuel cell

被引：31
作者：
Choudhary, Abhay Kumar [1 ]
Pramanik, Hiralal [1 ]
机构：
[1] Banaras Hindu Univ, Dept Chem Engn & Technol, Indian Inst Technol, Varanasi, Uttar Pradesh, India
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2020年 / 45卷 / 24期
关键词：
Fuel cells; Ethanol electrooxidation; Multi-walled carbon nanotubes; Pt-Ru-Re/f-MWCNT electrocatalyst; Cyclic voltammetry; WALLED CARBON NANOTUBES; IN-SITU FTIR; OXIDATION REACTION; OPERATING PARAMETERS; SUPPORTED PLATINUM; CATALYSTS; METHANOL; NANOPARTICLES; PERFORMANCE; PTRU/C;
D O I：
10.1016/j.ijhydene.2020.03.044
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Pt-Ru and Pt-Re and Pt-Ru-Re nanoparticles supported on functionalized multi-walled carbon nanotubes (f-MWCNT) were synthesized via modified polyol reduction method and tested thoroughly in a half cell and single direct ethanol fuel cell for ethanol electrooxidation in acidic medium. The MWCNTs were functionalized in a mixture of HNO3/H2SO4 solution for depositing a more active metal alloy nanoparticle on support material. The alloy formation of bi-metallic and tri-metallic electrocatalysts were examined by XRD analysis and more clearly explained by FE-SEM element mapping. The TEM analyses reveal that electrocatalysts nanoparticles are well dispersed on f-MWCNT, with spherical shapes and nano sizes range of 1.5-4 nm. The electrochemical analyses by cyclic voltammetry and chronoamperometry measurements reveal that tri-metallic electro-catalyst Pt-Ru-Re (1:1:0.5)/f-MWCNT exhibits the highest electrocatalytic activity and stability to- wards ethanol electrooxidation among all the synthesized electrocatalysts. The same electrocatalyst as anode in single DEFC results in excellent performance in comparison to all other synthesized electrocatalysts, with a maximum power density of 9.52 mW/cm(2) at a cell temperature of 30 degrees C. The bi-metallic Pt-Ru (1:1)/f-MWCNT and Pt-Re (1:1)/f-MWCNT produced power density of 7.48 mW/cm(2) and 4.74 mW/cm(2) at room temperature of 30 degrees C. The power density of DEFC enhanced 2.44 times, when cell operating temperature was increased from 30 degrees C to 80 degrees C using anode electrocatalyst Pt-Ru-Re (1:1:0.5)/f-MWCNT and keeping other parameters constant. The best result obtained in half cell and single DEFC using Pt-Ru-Re (1:1:0.5)/f-MWCNT electrocatalyst may be attributed to the synergistic effect of Pt, Ru and Re combined with bi-functional and ligand effects. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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页码：13300 / 13321
页数：22
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