期刊
SMALL
卷 16, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201906635
关键词
dispersion; electrocatalysts; electron mediators; graphene; oxygen evolution reaction; zwitterion functionalization
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2019R1A2C1009025, 2019R1A4A1029237]
- Korea government (MSIP) [2018R1A2A1A05077194, 2018R1D1A1B07045983]
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science and ICT [2019M1A2A2072416, 2019M1A2A2065616]
- Ministry of Trade, Industry and Energy through Technology Innovation Program [10067449]
- National Research Foundation of Korea [2019R1A2C1009025, 2018R1D1A1B07045983, 2019M1A2A2072416] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The functionalization of graphene has been extensively used as an effective route for modulating the surface property of graphene, and enhancing the dispersion stability of graphene in aqueous solutions via functionalization has been widely investigated to expand its use for various applications across a range of fields. Herein, an effective approach is described for enhancing the dispersibility of graphene in aqueous solutions at different pH levels via non-covalent zwitterion functionalization. The results show that a surfactant with electron-deficient carbon atoms in its backbone structure and large pi-pi interactive area enables strong interactions with graphene, and the zwitterionic side terminal groups of the molecule support the dispersibility of graphene in various pH conditions. Experimental and computational studies confirm that perylene diimide amino N-oxide (PDI-NO) allows efficient functionalization and pH-independent dispersion of graphene enabled by hydration repulsion effects induced by PDI-NO. The PDI-NO functionalized graphene is successfully used in the oxygen evolution reaction as an electron mediator for boosting the electrocatalytic activity of a Ru-based polyoxometalate catalyst in an acidic medium. The proposed strategy is expected to bring significant advances in producing highly dispersible graphene in aqueous medium with pH-independent stability, thus broadening the application range of graphene.
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