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Characteristics of CL-SPEEK/HPA Membrane Electrodes with Pt-Ni and Pt-Co Electrocatalysts for Water Electrolysis  

Woo, Je-Young (Dept. of Chemical Engineering, Myongji Univ)
Lee, Kwang-Mun (Dept. of Chemical Engineering, Myongji Univ)
Jee, Bong-Chul (Dept. of Chemical Engineering, Myongji Univ)
Chung, Jang-Hoon (Dept. of Chemistry, Myongji Univ.)
Moon, Sang-Bong (Elchem Tech Co., Ltd.)
Kang, An-Soo (Dept. of Chemical Engineering, Myongji Univ)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.21, no.1, 2010 , pp. 26-34 More about this Journal
Abstract
The electrocatalystic prperties of Pt-Co and Pt-Ni with heteropolyacids (HPAs) entrapped in covalently cross-linked sulfonated poly(ether ether ketone) (CL-SPEEK)/HPA membranes were investigated for water electrolysis. The HP As, including molybdophosphoric acid (MoPA), and tungstophosphoric acid (TPA) were both used as membrane additives and electrocatalysts. The membrane electrode assembly (MEA) was prepared by a nonequilibrium impregnation-reduction (I-R) method. $Pt(NH_3)_4Cl_2$, $NiCl_2$ and $CoCl_2$ as electrocatalytic materials and $NaBH_4$ as reducing agent were used. I order to enhance electrocatalytic activity, the catalyst layer prepared above was electrodeposited (Dep) with HP A. Surface morphologies and physico-chemical properties of MEA were investigated by means of SEM, EDX and XRD. The electrocatalytic properties of composite membranes such as the cell voltage and coulombic charge in CV were in the order of magnitude: CL-SPEEK/MoPA40 (wt%) > CL-SPEEK/TPA30 > Nafion117. In the optimum cell applications for water electrolysis, the cell voltage of Pt/CL-SPEEK-MoPA40/Pt-Co (Dep-MoPA) and Pt/CL-SPEEK-TPA30/Pt-Co (Dep-TPA) was 1.75 Vat $80^{\circ}C$ and $1\;A/cm^2$ and voltage efficiency was 87.1%. Also, the observed activity of Pt-Co (84:16 atomic ratio by EDX) is a little higher than that of Pt-Ni (86: 14). The current density peak of electrodeposited electrodes were better a little than those of unactivated electrodes based on the same membranes.
Keywords
Heteropolyacid; Pt-Co and Pt-Ni catalysts; Electrodeposite; CV; Cell voltage; Nonequilibrium impregnation-reduction(I-R) method;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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