期刊
MATERIALS
卷 12, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/ma12183028
关键词
laser ablated nanoparticles; Ir nanoparticles; bifunctional catalyst; overall water splitting
类别
资金
- Natural Science Foundation of China [51871160, 51671141, 51471115]
Engineering surface structure of catalysts is an efficient way towards high catalytic performance. Here, we report on the synthesis of regular iridium nanospheres (Ir NSs), with abundant atomic steps prepared by a laser ablation technique. Atomic steps, consisting of one-atom level covering the surface of such Ir NSs, were observed by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The prepared Ir NSs exhibited remarkably enhanced activity both for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in acidic medium. As a bifunctional catalyst for overall water splitting, they achieved a cell voltage of 1.535 V @ 10 mA/cm(2), which is much lower than that of Pt/C-Ir/C couple (1.630 V @ 10 mA/cm(2)).
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