期刊
JOURNAL OF MEMBRANE SCIENCE
卷 659, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2022.120810
关键词
Phosphoric acid; Proton exchange membrane; Codoping; Synergistic effect; Proton conduction
资金
- National Natural Science Foundation of China [22005109, 52171069]
- Natural Science Foundation of Hubei Province [2020CFB214]
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education
- China Postdoctoral Science Foundation [2021M701292]
- Open Project Program of Hubei Key Laboratory of Materials Chemistry and Service Failure [2020MCF02]
This study investigated the potential of one-dimensional and two-dimensional nanomaterials as proton conduction accelerators. Functionalized nanotubes and graphene oxide showed improved proton conductivity and enhanced proton transfer pathways in the codoped proton exchange membrane, leading to significant enhancement in proton conductivity and peak power density.
One dimensional (1D) and two dimensional (2D) nanomaterials with suitable functional groups possess great potential as proton conduction accelerators due to their long-range proton conductive feature. Herein, two outstanding proton conduction accelerators, phosphoric acid functionalized 1D carbon nanotubes and 2D graphene oxide (PCNT and PGO) were prepared, and then incorporated into Nafion matrix to obtain the codoped proton exchange membrane (PEM). Compared with common sulfonation, phosphorylation exhibits the prospect of more efficient proton conduction due to the amphoteric characteristic, large hydration energy and polarizability of phosphoric acid group (-PO3H2). Introduction of PCNT and PGO provided extra excellent proton conductive sites and improved water retention capacity. More importantly, codoping of PCNT and PGO made their 1D and 2D proton conduction pathways combine as hierarchical proton conduction pathways for better interconnecting ionic clusters, which further generated synergistic effect to form more consecutive proton transfer channels in the codoped PEM, whose proton conductivity climbed to 0.282 S/cm under 90 degrees C, 95% RH, distinctly greater than that of the recast Nafion (0.130 S/cm). Meanwhile, the codoped PEM attained a peak power density of 493.8 mW/cm2, which was approximately 72% larger than that of the recast Nafion (286.8 mW/cm2).
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