Facile synthesis of Co/Ni bimetallic phosphate as electrode material for urea fuel cells: Effect of synthetic strategy on the physicochemical and electrocatalytic behavior

被引：12
作者：
Abd El-Lateef H.M. [1 ,2 ]
Khalaf M.M. [1 ,2 ]
Alnajjar A.O. [1 ]
Mohamed I.M.A. [2 ]
机构：
[1] Department of Chemistry, College of Science, King Faisal University, Al-Ahsa
[2] Department of Chemistry, Faculty of Science, Sohag University, Sohag
来源：
Fuel | 2023年 / 334卷
关键词：
CoNi-phosphates; Electrochemical analysis; Electrooxidation; Fuel cell electrodes; Urea;
D O I：
10.1016/j.fuel.2022.126671
中图分类号：
学科分类号：
摘要：
Novel bimetallic Co/Ni phosphates were introduced in this work by two different synthetic strategies; reflux (CoNiP-R) and sol–gel (CoNiP-S) methods and evaluated as cheap electrodes for electrooxidation of urea (UEO) in alkaline medium (KOH medium). The as-prepared CoNiP-R and CoNiP-S materials were studied in terms of different physicochemical tools including Field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), transmission Electron Microscopy (TEM), dynamic light scattering (DLS), X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and Brunauer, Emmett and Teller (BET) surface area to understand what the effect of the synthetic method on the morphology, crystallinity, and surface area is. These investigations indicate the successful synthesis of smaller particles with higher surface area by sol–gel methodology if compared with the reflux method. The performance of CoNiP-R and CoNiP-S as electrode materials for UEO was evaluated through cyclic voltammetry (CV) at diverse urea contents and various sweep rates in addition to electrochemical impedance spectroscopy (EIS) and chronoamperometric (CA) methods. The synthesized CoNiP-S showed an enhanced UEO if compared with CoNiP-R at various urea doses up to 1.0 mol/l. Besides, the improvement of the obtained charge transfer resistance and current density indicates the increase of electrons generated from UEO. © 2022 Elsevier Ltd
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