Solvent-Mediated Control of the Electrochemical Discharge Products of Non-Aqueous Sodium-Oxygen Electrochemistry.
Solvent-Mediated Control of the Electrochemical Discharge Products of Non-Aqueous Sodium-Oxygen Electrochemistry.
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DOI：
10.1002/anie.201601615
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发表时间：
2016-07-11
期刊：
影响因子：
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通讯作者：
Hardwick LJ
中科院分区：
文献类型：
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作者：
Aldous IM;Hardwick LJ
在钠阳离子存在下的分子氧的还原可以被调节以在电极表面处产生超氧化钠或过氧化钠放电产物。控制这些过程的机械方向可以提高定制钠氧电池能量密度的能力（NaO 2：1071 Wh kg−1和Na 2 O2：1505 Wh kg−1）。 通过对一系列非水溶剂的光谱电化学分析，我们描述了这些过程对电解质溶剂的依赖性以及随后Na+和O2 −之间形成的相互作用。溶剂基于Gutmann供体数形成和去除[Na+-O2-]ads的能力影响电池的最终放电产物和机制。利用表面增强拉曼光谱和电化学技术，我们展示了对亚砜，酰胺，醚和腈电解质溶剂的Na‐O2电池化学反应的分析。
The reduction of dioxygen in the presence of sodium cations can be tuned to give either sodium superoxide or sodium peroxide discharge products at the electrode surface. Control of the mechanistic direction of these processes may enhance the ability to tailor the energy density of sodium–oxygen batteries (NaO2: 1071 Wh kg−1 and Na2O2: 1505 Wh kg−1). Through spectroelectrochemical analysis of a range of non‐aqueous solvents, we describe the dependence of these processes on the electrolyte solvent and subsequent interactions formed between Na+ and O2 −. The solvents ability to form and remove [Na+‐O2 −]ads based on Gutmann donor number influences the final discharge product and mechanism of the cell. Utilizing surface‐enhanced Raman spectroscopy and electrochemical techniques, we demonstrate an analysis of the response of Na‐O2 cell chemistry with sulfoxide, amide, ether, and nitrile electrolyte solvents.