Water-Dispersible, Sulfonated Hyperbranched Poly(ether-ketone) Grafted Multiwalled Carbon Nanotubes as Oxygen Reduction Catalysts
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- Water-Dispersible, Sulfonated Hyperbranched Poly(ether-ketone) Grafted Multiwalled Carbon Nanotubes as Oxygen Reduction Catalysts
- Sohn, Gyung-Joo; Choi, Hyun-Jung; Jeon, In-Yup; Chang, Dong Wook; Dai, Liming; Baek, Jong-Beom
- Aqueous dispersions; Cathode materials; Chlorosulfonic acid; Electrocatalytic activity; Friedel-crafts acylation; Hyperbranched; Hyperbranched polymers; Oxygen reduction catalysts; Oxygen reduction reaction; Potential values; Water affinity; Water dispersible
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.6, no.7, pp.6345 - 6355
- To endorse sufficient water affinity to multiwalled carbon nanotubes (MWCNTs), dendritic hyperbranched poly(ether-ketone) (HPEK) was first covalently grafted to the surface of a MWCNT via a Friedel-Crafts acylation reaction. The resultant HPEK-grafted MWCNT (HPEK-g-MWCNT) was subsequently sulfonated in chlorosulfonic acid to produce sulfonated HPEK-g-MWCNT (SHPEK-g-MWCNT), which is dispersible well in water showing a zeta potential value of -57.8 mV. The SHPEK-g-MWCNT paper simply formed by filtration of aqueous dispersion has a sheet resistance as low as 63 Omega/sq. Its thin film shows a high electrocatalytic activity for oxygen reduction reaction (ORR). Thus, the newly produced water-dispersible MWCNT is a new class of high performance cathode material for ORR.
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