کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6470279 | 1424105 | 2017 | 11 صفحه PDF | دانلود رایگان |
In this work, we develop a bifunctional composite comprised of hierarchical flower-like NiMn-layered double hydroxides (LDH) nanoarrays grown on melamine sponge-derived carbon (SC). This composite material is used as a flexible asymmetric supercapacitor positive electrode and oxygen evaluation reaction (OER) electrocatalyst. Integrated carbon foams with controllable three-dimensional pores are easily obtained and served as conductive backbones for the growth of the flower-like NiMn-LDH nanoarrays. The as-prepared flexible electrode, combining a highly open scaffold-like structure with well-designed electron transfer channels, shows significantly enhanced cyclic stability (99.6% of the initial activity maintained after 5000 cycles) and high energy density (41.0 Wh·Kgâ1) in aqueous electrolyte. The as-prepared SC@NiMn-LDH@G//NPC asymmetric supercapacitor can lighten a LED indicator for more than 10 minutes. Additionally, this composite presents extremely low overpotentials (220 mV at 10 mA·cmâ2) and low Tafel slopes (30 mV·decâ1) in alkaline medium. This OER performance is one of the best reported so far among the state of art electrocatalysts.
Journal: Electrochimica Acta - Volume 252, 20 October 2017, Pages 275-285