| 초록 |
Fuel cells (FCs) is an electrochemical cell that converts chemical energy into electric energy and can be operated at low temperature (~80 oC) having high power density, rapid start-up, high efficiency and low costs. Presently platinum on activated carbon (Pt/C) catalyst in FC is show stopper because of its high cost, carbon monoxide and impurity poisoning and fuel crossover. Therefore, we report conjugated polyelectrolyte/edge-carboxylated graphene nanosheets (ECG) composites as a low low-cost and high high-performance metal-free electrocatalysts for oxygen reduction reaction (ORR) in FCs. We found that poly(pyridinium salt)s (PPS) can easily interact with carboxyl group of in ECG, and thus play as dispersing agents for exfoliation of ECG into few-layer ECG by π-π interactions between PPS and ECG layer. In addition, the polymers PPS can efficiently transfer charge via quaternary nitrogen atoms with displaying high electrochemical stability to facilitate efficient ORR. |
