Solid solution palladium-nickel bimetallic anode catalysts by co-sputtering for direct urea fuel cells (DUFC)
- Authors
- Yoon, Jaesik; Lee, Doohee; Lee, Yu Na; Yoon, Young Soo; Kim, Dong-Joo
- Issue Date
- 15-Aug-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Bimetallic catalyst; Electrocatalyst; Pd-Ni bimetal; Direct urea/urine fuel cell (DUFC); Co-sputtering
- Citation
- JOURNAL OF POWER SOURCES, v.431, pp.259 - 264
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 431
- Start Page
- 259
- End Page
- 264
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1108
- DOI
- 10.1016/j.jpowsour.2019.05.059
- ISSN
- 0378-7753
- Abstract
- A solid solution Pd-Ni alloy co-sputtered on carbon paper (Pd-Ni/C) is explored as a catalyst in the flow-through porous anode of a direct urea fuel cell (DUFC). The catalytic performances of urea electro-oxidation in an alkaline medium are investigated by cyclic voltammetry and chronoamperometry. In order to minimize the effect of morphological variation by the Pd-Ni composition, the island structure with a uniform size or electrochemical surface area was prepared. The Pd-Ni/C electrode shows a much higher electrocatalytic activity and lower onset oxidation potential toward urea electro-oxidation compared to the Ag-Ni/C and Pt-Ni/C electrodes prepared by the same procedure. When the DUFC with a cell configuration of Pd-Ni/C anode and Pd/C cathode operates at room temperature, an open circuit voltage of 0.59 V was obtained with 0.33 molL(-1) urea solution as anolyte and humidification oxygen as the catholyte. The DUFC also exhibits a maximum power density of 1.12 mWcm(-2). The electrocatalytic activity by the developed solid solution is largely attributed to high intrinsic electronic conductivity, excellent porous network structures and a synergetic effect by the constituting bimetallic elements. This work develops a simple type of anode catalyst for DUFC, which can possibly open a promising approach for urea-rich wastewater treatment.
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