Tuning the Morphology of Li2O2 by Noble and 3d metals: A Planar Model Electrode Study for Li–O2 Battery

• DOI: 10.1021/acsami.7b02663
• Publication Date: 2017-05-24T15:27:26Z
• Authors: Yao Yang; Wei Liu; Nian Wu; Xiaochen Wang; Tao Zhang; Linfeng Chen; Rui Zeng; Yingming Wang; Juntao Lu; Lei Fu; Li Xiao; Lin Zhuang
• Keywords: Noble metal; Morphology

In this work, a planar model electrode method has been used to investigate the structure–activity relationship of multiple noble and 3d metal catalysts for cathode reaction Li–O2 battery. The result shows that battery performance (discharge/charge overpotential) strongly depends not only on type but also morphology discharge product (Li2O2). Specifically, according electrochemical characterization scanning electron microscopy (SEM) observation, metals (Pd, Pt, Ru, Ir, Au) show excellent (smaller discharge/charge overpotential), with wormlike Li2O2 particles size less than 200 nm their surfaces. On other hand, (Fe, Co, Ni, Mn) offered poor (larger much larger (1 μm few microns) surfaces after discharging. Further research "volcano plot" is found by correlating discharging/charging plateau voltage adsorption energy LiO2 different metals. better worm-like-shaped are closer top "volcano", indicating one key characters catalyst reach good oxygen battery, it strong influence surface.