Enhanced Electrochemical Properties of Catalyst by Phosphorous Addition for Direct Urea Fuel Cell
- Authors
- Lee, U.; Lee, Y.N.; Yoon, Y.S.
- Issue Date
- Oct-2020
- Publisher
- Frontiers Media S.A.
- Keywords
- anion exchange fuel cell; anode catalyst; direct urea fuel cell; hydrothermal synthesis; MWCNTs; Ni-Pd alloy; phosphorous addition; urea
- Citation
- Frontiers in Chemistry, v.8
- Journal Title
- Frontiers in Chemistry
- Volume
- 8
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/78916
- DOI
- 10.3389/fchem.2020.00777
- ISSN
- 2296-2646
- Abstract
- An anode bimetallic catalyst comprising Ni-Pd alloy nanoparticles was loaded on acid-treated multi-walled carbon nanotubes (MWCNTs) for application in a direct urea fuel cell. The bimetallic catalyst and MWCNTs were synthesized by a hydrothermal method at 160°C for 5 h. To reduce the catalyst particle size, alkaline resistance, and facilitate their uniform distribution on the surface of the MWCNTs, phosphorus (P) was added to the Ni-Pd/MWCNT catalyst. The effects of P on the distribution and reduction in size of catalyst particles were investigated by Brunauer–Emmett–Teller analysis, transmission electron microscopy, and X-ray diffraction analysis. The enhanced catalytic activity and durability of the P-containing catalyst was confirmed by the high current density [1897.76 mA/cm2 (vs. Ag/AgCl)] obtained at 0.45 V in a 3 M KOH/1.0 M urea alkaline aqueous solution compared with that of the catalyst without P [604.87 mA/cm2 (vs. Ag/AgCl)], as determined by cyclic voltammetry and chronoamperometry. A Urea–O2 fuel cell assembled with a membrane electrode assembly comprising the Ni-Pd(P)/MWCNT catalyst delivered peak power densities of 0.756 and 3.825 mW/cm2 at 25 and 60°C, respectively, in a 3 M KOH/1 M urea solution. © Copyright © 2020 Lee, Lee and Yoon.
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