Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 46, Issue 3, Pages 3072-3079Publisher
WILEY-HINDAWI
DOI: 10.1002/er.7364
Keywords
chromium oxyhydroxide; high water adsorption; proton conduction; proton exchange membrane
Categories
Funding
- National Natural Science Foundation of China [21871042, 21471028, 21673098, 21671036]
- Natural Science Foundation of Jilin Province [20200201083JC]
- Jilin Provincial Education Department [JJKH20201169KJ]
- Fundamental Research Funds for the Cent tral Universities [2412015KJ012, 2412017BJ004]
- Jilin Provincial Department of Education
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This study developed a simple and feasible method to synthesize a new proton-conductive material, amorphous chromium oxyhydroxide (CrO(OH)·xH2O), with high water absorption and ultra-high proton conductivity. Applying CrO(OH)·xH2O to proton exchange membranes showed proton conductivity comparable to Nafion, indicating a promising new pathway for efficient proton conductors using metal oxyhydroxides.
Proton-conductive membranes restrict the energy conversion efficiency and operating performance of the proton exchange membrane fuel cells. In this work, we develop a simple and easy scale-up method to synthesise a new proton-conductive material, amorphous chromium oxyhydroxide (CrO(OH)center dot xH(2)O). The CrO(OH)center dot xH(2)O shows a high water-adsorption value of 450 mg g(-1), contributing to the construction of continuous and ordered hydrogen-bonding network within the materials. An ultra-high proton conductivity of 0.31 S cm(-1) is obtained in CrO(OH)center dot xH(2)O at 90 degrees C and 98% relative humidity, with an activation energy of 0.39 eV, which indicates a proton hopping mechanism. To further study the application potential of CrO(OH)center dot xH(2)O in proton exchange membranes, CrO(OH)center dot xH(2)O is added to sulfonated poly(ether ether ketone) (SPEEK) as a dopant, forming a SPEEK-CrO(OH) proton exchange membrane. The composite membrane exhibits a proton conductivity comparable to Nafion, 0.17 S cm(-1) at 80 degrees C in water without decreasing in 36 hours. This research enlightens us the development of metal oxyhydroxide via a simple and feasible strategy as efficient proton conductors.
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