Solvent-Coupled Catalysis of the Oxygen Electrode Reactions in Lithium-Air Batteries

被引:37
作者
Trahan, Matthew J. [1 ]
Gunasekara, Iromie [1 ]
Mukerjee, Sanjeev [1 ]
Plichta, Edward J. [2 ]
Hendrickson, Mary A. [2 ]
Abraham, K. M. [1 ]
机构
[1] Northeastern Univ, Dept Chem & Chem Biol, Boston, MA 02115 USA
[2] US Army RDECOM CERDEC CP&I, Power Div, RDER CCP, Aberdeen Proving Ground, MD 21005 USA
关键词
BIFUNCTIONAL CATALYST; COBALT PHTHALOCYANINE; REDUCTION; GRAPHENE; NANOPARTICLES; PEROVSKITE; RECHARGEABILITY; NANOWIRES; CATHODE; MEDIA;
D O I
10.1149/2.0981410jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The electrocatalysis of oxygen reduction reactions (ORR) in non-aqueous electrolytes is coupled to the ability of the solvents to modulate the Lewis acidity of Li+. This is accomplished through chemical interactions of Li+ with the solvent to form acid-base complexes of the general formula, Li(solvent)(n)(+), which determine the relative stability of the ORR intermediates and the final products formed. In high Donor Number solvents such as dimethyl sulfoxide (DMSO), the ORR proceeds via an outer Helmholtz plane (OHP) reaction pathway, conforming to a homogeneous catalysis of the reaction, irrespective of the presence of a catalyst in the cathode. In low Donor Number solvents exemplified by tetraethylene glycol dimethyl ether (TEGDME) and CH3CN, catalysts such as cobalt phthalocyanine (CoPC), Pt and Au promote heterogeneous electrocatalysis at the inner Helmholtz plane (MP) of the electrical double layer on the electrode. The catalysis in this case involve the adsorption of O-2 as well as the ORR intermediates on the catalyst surface leading to lower activation energy of the reactions and increases in the discharge voltages of Li-air cells compared to uncatalyzed cells. The heterogeneous catalysis at the IHP may promote the full electrochemical reduction of O-2 to O-2(-). (C) 2014 The Electrochemical Society. All rights reserved.
引用
收藏
页码:A1706 / A1715
页数:10
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