Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 29, Pages 15001-15007Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta02190a
Keywords
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Funding
- National Natural Science Foundation of China [51472187, 51272200, 6127413]
- Distinguished Young Scientists of Hubei [2014CFA045]
- Program for New Century Excellent Talents in University [NCET-12-0911]
- Wuhan University of Technology startup funding [40120187]
- Australian Research Council [DP120104932, DP150102025]
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An oxygen electrode finds many applications in various electrochemical energy conversion devices such as fuel cells and metal-air batteries. Highly efficient gas-proton transportation at the electrode is very important to enhance the power density of these devices. Herein, we report the construction of a highly efficient oxygen electrode with substantially improved proton conductivity and gas transportation properties using three dimensionally ordered macroporous Nafion/Cs2.5H0.5PW12O40, 3DOM Nafion/CsHPW, scaffold supported Pt/C nanocomposites. The best results were obtained for cells with 3DOM Nafion/CsHPW with 10% CsHPW, achieving a maximum power density of 955 mW cm(-2), 31% higher than 730 mW cm(-2) for the cell with the conventional Nafion-binder based oxygen electrode. The proton conductivity of the 10% 3DOM Nafion/CsHPW catalyst layer is 1.56 x 10(-2) S cm(-1), 112% higher than 7.35 x 10(-3) S cm(-1) measured for the conventional catalyst layer with the Nafion binder. The results demonstrate the significant advantages of the oxygen electrodes with the Pt/C-3DOM Nafion/CsHPW architecture over the conventional Nafion-binder based ones, with the significantly enhanced proton conductivity of uniformly distributed CsHPW nanoparticles (NPs) and much better gas diffusion properties of the 3DOM architecture.
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