Jun Young Jin, Park Sung Hyeon, Woo Seong Ihl
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology , Daejeon, 305-701, Republic of Korea.
ACS Comb Sci. 2014 Dec 8;16(12):670-7. doi: 10.1021/co500041n. Epub 2014 Nov 17.
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.
开发了组合高通量光学筛选方法，以寻找混合锂空气电池阴极上高活性钯基催化剂的最佳组成。单独的钯，其成本仅为铂的三分之一，难以替代铂；因此，研究了其他金属的整合以提高其对氧还原反应（ORR）的性能。在二元钯基催化剂中，钯 - 铱衍生催化剂的组成对ORR的性能比其他钯基二元组合更高。在88:12原子百分比（钯：铱）时的组成对混合锂空气电池阴极上的ORR表现出最高活性。制备的Pd(88)Ir(12)/C催化剂在0.8 V（相对于可逆氢电极）下的电流密度为-2.58 mA cm(-2)，与Pd/C（-1.97 mA cm(-2)）相比高出约30%。当将制备的Pd(88)Ir(12)/C催化剂应用于混合锂空气电池时，电池的极化降低，且电池的能量效率比使用Pd/C的电池高出约30%。
