1. A highly active Ni-based anode material for urea electrocatalysis by a modified sol–gel method.
- Author
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Tran, Manh Hoang, Park, Bang Ju, and Yoon, Hyon Hee
- Subjects
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MICROBIAL fuel cells , *ELECTROCATALYSIS , *SOL-gel processes , *UREA , *FOURIER transform infrared spectroscopy , *FUEL cells , *X-ray photoelectron spectroscopy - Abstract
• A highly porous Ni-based electrocatalyst was synthesized by a sol–gel method with bubbling of gel mixture. • The Ni-based catalyst exhibited a high oxidation activity of 570 mA mg−1. • A urea fuel cell with the Ni-based anode catalyst exhibited a maximum power density of 36.4 at 70 °C. • The urea fuel cell showed a stable voltage over 3 days. A highly electroactive Ni-based catalyst for urea oxidation is prepared by a sol–gel method with bubbling of gel mixture. It is observed that the conditions for the gel formation strongly affect the morphology and electrochemical properties of the catalyst materials. As synthesized Ni-catalysts are characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The Ni-based catalyst prepared at optimum conditions in the scope of this study exhibits the urea oxidation activity of 570 mA mg−1 (at 0.54 V). In a single urea/hydrogen peroxide fuel cell test, the Ni-catalyst provides maximum power densities of 19.6 and 36.4 mW cm−2 at 30 and 70 °C, respectively. Additionally, the cell catalyst shows a stable voltage for 3 days. Thus, this work suggests that a novel Ni-based catalyst derived from a facile method can be used for urea oxidation and as an efficient anode material for urea fuel cells. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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