Combinatorial high-throughput optical screening of high performance Pd alloy cathode for hybrid Li-air battery.
Combinatorial high-throughput optical screening method was developed to find the optimum composition of highly active Pd-based catalysts at the cathode of the hybrid Li-air battery. Pd alone, which is one-third the cost of Pt, has difficulty in replacing Pt; therefore, the integration of other metals was investigated to improve its performance toward oxygen reduction reaction (ORR). Among the binary Pd-based catalysts, the composition of Pd-Ir derived catalysts had higher performance toward ORR compared to other Pd-based binary combinations. The composition at 88:12 at. % (Pd: Ir) showed the highest activity toward ORR at the cathode of the hybrid Li-air battery. The prepared Pd(88)Ir(12)/C catalyst showed a current density of -2.58 mA cm(-2) at 0.8 V (vs RHE), which was around 30% higher compared to that of Pd/C (-1.97 mA cm(-2)). When the prepared Pd(88)Ir(12)/C catalyst was applied to the hybrid Li-air battery, the polarization of the cell was reduced and the energy efficiency of the cell was about 30% higher than that of the cell with Pd/C.
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology , Daejeon, 305-701, Republic of Korea.
Young Jin
YJ
Jun
Sung Hyeon
SH
Park
Seong Ihl
SI
Woo
D000497:Alloys / Q000737:chemistry*; D002384:Catalysis; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D014961:X-Ray Diffraction
D000497:Alloys; D010165:Palladium
cathode of Li−air battery; combinatorial high-throughput method; hybrid Li−air battery; optical screening