Bifuntional petaloid nickel manganese layered double hydroxides decorated on a freestanding carbon foam for flexible asymmetric supercapacitor and oxygen evolution. (20th October 2017)

• Record Type: Journal Article
• Authors: Li, Xuejin; Zhou, Jin; Li, Xiaochen; Xin, Meiyi; Cai, Tonghui; Xing, Wei; Chai, Yongming; Xue, Qingzhong; Yan, Zifeng
• Is Part Of: Electrochimica acta. Volume 252(2017)
• Page Start: 275
• Page End: 285
• Publication Date: 2017-10-20
• Subjects: carbon foam -- layered double hydroxides -- electrocatalyst -- supercapacitor -- oxygen evolution reaction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.08.028
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: 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·Kg −1 ) 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·cm −2 ) and low Tafel slopes (30 mV·dec −1 ) in alkaline medium. This OER performance is one of the best reported so far among the state of art electrocatalysts.