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Ethanol Electro‐oxidation in Aqueous and Poly(acrylic acid)‐Based Gel Alkaline Electrolytes, Varying the PdxAgy Composition by using Differential Pulse Amperometry
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-02-16 , DOI: 10.1002/celc.201800076
Ciro M. Martínez 1, 2 , Oscar Ambriz-Peláez 1 , Lorena Álvarez-Contreras 3 , Janet Ledesma-García 4 , Minerva Guerra-Balcázar 4 , Noé Arjona 1
Affiliation  

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 PdxAgy 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 Pd75Ag25, Pd60Ag40, and Pd50Ag50, 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: Pd60Ag40>Pd50Ag50>Pd75Ag25≥Pd, where Pd60Ag40 showed the highest current density with 102.6 mA mg−1 Pd. In the PAA‐K gel electrolyte, Pd60Ag40 also achieved the highest peak current density (7.5 mA mg−1 Pd). Additionally, Pd60Ag40 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).

中文翻译:

在水性和聚丙烯酸丙烯酸凝胶碱性电解质中进行乙醇电氧化,通过使用差分脉冲安培法改变PdxAgy的组成

在这项工作中,我们制备了一种基于聚(丙烯酸)偏钾盐(PAA-K)的聚合物凝胶,可将其用作乙醇电氧化中的电解质。此外,我们通过差分脉冲安培法(DPA)通过改变金属比来合成Pd x Ag y材料。这些材料的粒度范围为40至60 nm,通过X射线荧光测定,其组成为Pd 75 Ag 25,Pd 60 Ag 40和Pd 50 Ag 50。在1.0 M乙醇下对水性电解质中乙醇氧化的电催化评估导致以下活性趋势:Pd 60 Ag 40>钯5050 >钯7525 ≥Pd,其中的Pd 6040显示出与102.6毫安毫克最高电流密度-1的Pd。在PAA‐K凝胶电解质中,Pd 60 Ag 40也达到了最高峰值电流密度(7.5 mA mg -1  Pd)。此外,Pd 60 Ag 40在水和凝胶电解质中保持几乎相同的氧化电位(相对于NHE为-0.41 V ),但是由于PAA-K电解质的高粘度(〜400 cP),电流密度降低了13.7倍。
更新日期:2018-02-16
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