Efficient Li2O2 Formation via Aprotic Oxygen Reduction Reaction Mediated by Quinone Derivatives
Efficient Li2O2 Formation via Aprotic Oxygen Reduction Reaction Mediated by Quinone Derivatives
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DOI：
10.1021/jp504894e
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发表时间：
2014-08
影响因子：
3.7
通讯作者：
S. Matsuda;K. Hashimoto;Shuji Nakanishi
中科院分区：
文献类型：
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作者：
S. Matsuda;K. Hashimoto;Shuji Nakanishi
由于伴随Li 2 O2形成的非质子Li离子电解质中的氧还原反应（ORR）是非水非质子Li-空气电池放电的关键反应，因此强烈要求降低反应的过电位以改善放电性能。在本工作中，我们研究了非质子Li+电解质中的碳材料上的ORR的醌衍生物的添加的效果。详细的电化学分析表明，半醌类催化非质子ORR，导致有效的Li 2 O2形成。在醌衍生物中，苯醌表现出最好的催化性能，Li 2 O2形成的过电位小于100 mV。
Since the oxygen reduction reaction (ORR) in aprotic Li ion electrolytes accompanied by Li2O2 formation is a crucial reaction for the discharge of nonaqueous aprotic Li–air batteries, there is a strong demand for a reduction in the overpotential of the reaction in order to improve the discharge performance. In the present work, we investigated the effect of the addition of quinone derivatives for ORR on carbon materials in aprotic Li+–electrolytes. Detailed electrochemical analysis revealed that the semiquinone species catalyze the aprotic ORR, resulting in the efficient Li2O2 formation. Among the quinone derivatives, benzoquinone exhibited the best catalytic performance, with an overpotential for the Li2O2 formation of less than 100 mV.