Li Fei, Zheng Li-Jun, Wang Xiao-Xue, Li Ma-Lin, Xu Ji-Jing, Wang Yu
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P.R. China.
International Center of Future Science, Jilin University, Changchun 130012, P. R. China.
ACS Appl Mater Interfaces. 2021 Jun 9;13(22):26123-26133. doi: 10.1021/acsami.1c06540. Epub 2021 May 30.
Although the lithium-oxygen (Li-O) battery brings hope for the improvement of high-energy rechargeable batteries, the sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics become the major stumbling block. Herein, the incorporation of a plasmonic silver cathode as an advanced strategy to promote ORR and OER kinetics due to strong local surface plasmon resonance (LSPR) is introduced. Chronoamperometry results revealed that the highly energetic electrons and holes excited by LSPR of silver nanostructure facilitated ORR and OER kinetics ascribe to the emission of hot carriers in femtosecond time scale. Furthermore, a relatively rare discharge voltage 3.1 V is obtained, correspondingly, the charge plateau also decline to 3.3 V, the energy efficiency of Li-O battery by a 23% increase in comparison with a commercial 5% Pt/C catalyst (discharge and charge plateau of 2.75 and 3.61 V). Additionally, the improvement in the efficient charge transfer manner result in a reversible spherical LiO which further improve the ORR and OER kinetics. The LSPR strategy represents a critical step toward developing fast kinetics and high energy efficiency Li-O batteries.
尽管锂氧（Li-O）电池为高能可充电电池的改进带来了希望，但缓慢的氧还原反应（ORR）和析氧反应（OER）动力学成为了主要绊脚石。在此，引入了等离子体银阴极作为一种先进策略，以促进ORR和OER动力学，这归因于强烈的局部表面等离子体共振（LSPR）。计时电流法结果表明，银纳米结构的LSPR激发的高能电子和空穴促进了ORR和OER动力学，这归因于飞秒时间尺度内热载流子的发射。此外，获得了相对罕见的放电电压3.1 V，相应地，充电平台也降至3.3 V，与商用5% Pt/C催化剂（放电和充电平台分别为2.75和3.61 V）相比，Li-O电池的能量效率提高了23%。此外，有效电荷转移方式的改进导致形成了可逆的球形LiO，这进一步改善了ORR和OER动力学。LSPR策略是朝着开发快速动力学和高能效Li-O电池迈出的关键一步。
