TY - JOUR
T1 - Synergetic Effect of Liquid and Solid Catalysts on the Energy Efficiency of Li-O2 Batteries
T2 - Cell Performances and Operando STEM Observations
AU - Hou, Chen
AU - Han, Jiuhui
AU - Liu, Pan
AU - Huang, Gang
AU - Chen, Mingwei
N1 - Funding Information:
This work was sponsored by the JST-CREST “Phase Interface Science for Highly Efficient Energy Utilization”, JST (Japan), National Natural Science Foundation of China (51821001 and 11704245), Natural Science Foundation of Shanghai (19ZR1475200) and JSPS Grant-in-Aid for Research Activity Start-up (18H05939). M.C. was supported by the Whiting School of Engineering, Johns Hopkins University. P. L. is sponsored by Shanghai Eastern Scholar Program.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/3/11
Y1 - 2020/3/11
N2 - The sluggish cathodic kinetics and lower energy efficiency, associated with solid and insulating discharge products of Li2O2, are the key factors that prevent the practical implementation of Li-O2 batteries (LOBs). Here we demonstrate that the combination of the solid catalyst (RuO2) and soluble redox mediator tetrathiafulvalene (TTF) exhibits a synergetic effect in improving the cathodic kinetics and energy efficiency of LOBs by reducing both charge and discharge overpotentials. Operando electron microscopy observations and electrochemical measurements reveal that RuO2 not only exhibits bifunctional catalysis for Li-O2 reactions but also benefits the catalytic efficiency of TTF. Meanwhile, TTF plays an important role in activating the Li2O2 passivated RuO2 catalysts and in helping RuO2 effectively oxidize the discharge products during charging. The synergetic effect of solid and liquid catalysts, beyond traditional bifunctional catalysis, obviously increases the cathodic kinetics and round-trip energy efficiency of LOBs.
AB - The sluggish cathodic kinetics and lower energy efficiency, associated with solid and insulating discharge products of Li2O2, are the key factors that prevent the practical implementation of Li-O2 batteries (LOBs). Here we demonstrate that the combination of the solid catalyst (RuO2) and soluble redox mediator tetrathiafulvalene (TTF) exhibits a synergetic effect in improving the cathodic kinetics and energy efficiency of LOBs by reducing both charge and discharge overpotentials. Operando electron microscopy observations and electrochemical measurements reveal that RuO2 not only exhibits bifunctional catalysis for Li-O2 reactions but also benefits the catalytic efficiency of TTF. Meanwhile, TTF plays an important role in activating the Li2O2 passivated RuO2 catalysts and in helping RuO2 effectively oxidize the discharge products during charging. The synergetic effect of solid and liquid catalysts, beyond traditional bifunctional catalysis, obviously increases the cathodic kinetics and round-trip energy efficiency of LOBs.
KW - RuO
KW - liquid-cell electron microscopy
KW - lithium-oxygen battery
KW - redox mediators
KW - synergetic catalytic effect
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U2 - 10.1021/acs.nanolett.0c00357
DO - 10.1021/acs.nanolett.0c00357
M3 - Article
C2 - 32078329
AN - SCOPUS:85081945213
VL - 20
SP - 2183
EP - 2190
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 3
ER -
