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Ethanol Electro‐oxidation in Aqueous and Poly(acrylic acid)‐Based Gel Alkaline Electrolytes, Varying the Pd x Ag y Composition by using Differential Pulse Amperometry
Author(s) -
Martínez Ciro M.,
AmbrizPeláez Oscar,
ÁlvarezContreras Lorena,
LedesmaGarcía Janet,
GuerraBalcázar Minerva,
Arjooé
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800076
Subject(s) - electrolyte , chemistry , aqueous solution , acrylic acid , nuclear chemistry , inorganic chemistry , supporting electrolyte , ethanol , amperometry , electrochemistry , electrode , polymer , organic chemistry , copolymer
In this work, we prepared a polymer gel based on poly (acrylic acid) partial potassium salt (PAA‐K) for its use as an electrolyte in the ethanol electro‐oxidation. In addition, we synthesized Pd x Ag y materials by varying the metallic ratio through differential pulse amperometry (DPA). These materials showed particle sizes ranging from 40 to 60 nm, and their compositions were Pd 75 Ag 25 , Pd 60 Ag 40 , and Pd 50 Ag 50 , as determined by X‐ray fluorescence. Electrocatalytic evaluation of ethanol oxidation in aqueous electrolyte at 1.0 M ethanol resulted in the following activity trend: Pd 60 Ag 40 >Pd 50 Ag 50 >Pd 75 Ag 25 ≥Pd, where Pd 60 Ag 40 showed the highest current density with 102.6 mA mg −1 Pd. In the PAA‐K gel electrolyte, Pd 60 Ag 40 also achieved the highest peak current density (7.5 mA mg −1 Pd). Additionally, Pd 60 Ag 40 maintained almost the same oxidation potential (−0.41 V vs . NHE) in aqueous and gel electrolytes, but the current density decreased 13.7‐fold owing to the high viscosity of PAA‐K electrolyte (∼400 cP).