| 초록 |
Rechargeable Li–O2 batteries have high theoretical energy density (~3600 Wh kg-1) against conventional Li–ion cells. Surface plasmon resonance (SPR), the unique property of plasmonic materials (e.g. Au, Ag) resulting from their interaction with light, has found increasing application in catalysis. Here, we demonstrate the possibility of integrating plasmonic effects in Li–O2 systems by incorporating gold nanoparticles (different amounts/sizes) on a practical Ketjen Black cathode. During discharge, plasmonic Au NPs induce a Li2O2 morphology change to small particles, which are easily decomposed during recharge. Most importantly, the SPR-induced hot carriers help to form and decompose Li2O2 and suppress carboxylate side-products, decreasing recharge voltages and increasing the round-trip efficiency up to 80.2%. Meticulous analyses of the catalytic properties of the Au NPs and the SPR-induced near-field enhancement and local heat effects are here additionally shared. |
