Galloway Thomas A, Dong Jin-Chao, Li Jian-Feng, Attard Gary, Hardwick Laurence J
Stephenson Institute for Renewable Energy , Department of Chemistry , University of Liverpool , UK . Email:
State Key Laboratory of Physical Chemistry and Solid Surfaces , University of Xiamen , China.
Chem Sci. 2019 Jan 17;10(10):2956-2964. doi: 10.1039/c8sc05489d. eCollection 2019 Mar 14.
Sodium-oxygen battery cathodes utilise the reversible redox species of oxygen in the presence of sodium ions. However, the oxygen reduction and evolution reaction mechanism is yet to be conclusively determined. In order to examine the part played by surface structure in sodium-oxygen electrochemistry for the development of catalytic materials and structures, a method of preparing clean, well-defined Pt electrode surfaces for adsorption studies in aprotic solvents is described. Using cyclic voltammetry (CV) and electrochemical shell-isolated nanoparticle enhanced Raman spectroscopy (SHINERS), the various stages of oxygen reduction as a function of potential have been determined. It is found that on Pt{111} and Pt{110}-(1 × 1) terraces, a long lived surface sodium peroxide species is formed reversibly, whereas on Pt{100} and polycrystalline electrodes, this species is not detected.
钠氧电池阴极在钠离子存在的情况下利用氧的可逆氧化还原物种。然而，氧还原和析出反应机理尚未最终确定。为了研究表面结构在钠氧电化学中对催化材料和结构发展所起的作用，本文描述了一种在非质子溶剂中制备用于吸附研究的清洁、明确的铂电极表面的方法。利用循环伏安法（CV）和电化学壳层隔离纳米粒子增强拉曼光谱（SHINERS），已确定了氧还原随电位变化的各个阶段。研究发现，在Pt{111}和Pt{110}-(1×1)平台上，可逆地形成了一种寿命较长的表面过氧化钠物种，而在Pt{100}和多晶电极上未检测到该物种。
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