| 초록 |
Developing a highly efficient and durable proton exchange membrane fuel cell (PEMFC) using a low amount of platinum (Pt) is essential for minimizing the total cost. Herein, we demonstrate the development of high-performance PEMFC catalysts using ultra-low Pt loaded (1 wt%) porous carbon with controlled channel diameters (Dch = 13-63 nm), produced from block copolymer particles. The single cell based on the catalyst with the largest Dch of 63 nm yields an initial maximum power density of 1230 mW cm-2 and high durability showing 1120 mW cm-2 after 30,000 cycles under H2/O2 flow, which outperforms those of commercial Pt/C catalysts despite 1/20 Pt usage. Furthermore, the catalyst shows outstanding performance with 51 kW per gram of Pt (kW/gPt) after 30,000 cycles in H2/air flow, which is the highest performance reported to date. The channel structure and large Dch of the porous particles are the key to enhancing the power density by improving the proton and mass transport. |
