Metallic Co4N Porous Nanowire Arrays Activated by Surface Oxidation as Electrocatalysts for the Oxygen Evolution Reaction. (6th October 2015)

• Record Type: Journal Article
• Authors: Chen, Pengzuo; Xu, Kun; Fang, Zhiwei; Tong, Yun; Wu, Junchi; Lu, Xiuli; Peng, Xu; Ding, Hui; Wu, Changzheng; Xie, Yi
• Is Part Of: Angewandte Chemie. Volume 127:Number 49(2015)
• Page Start: 14923
• Page End: 14927
• Publication Date: 2015-10-06
• Subjects: Cobaltnitrid -- Elektrodenkonfigurationen -- Elektrokatalysatoren -- Poröse Nanodrähte -- Sauerstoffentwicklung; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201506480
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Designing highly efficient electrocatalysts for oxygen evolution reaction (OER) plays a key role in the development of various renewable energy storage and conversion devices. In this work, we developed metallic Co4 N porous nanowire arrays directly grown on flexible substrates as highly active OER electrocatalysts for the first time. Benefiting from the collaborative advantages of metallic character, 1D porous nanowire arrays, and unique 3D electrode configuration, surface oxidation activated Co4 N porous nanowire arrays/carbon cloth achieved an extremely small overpotential of 257 mV at a current density of 10 mA cm −2, and a low Tafel slope of 44 mV dec −1 in an alkaline medium, which is the best OER performance among reported Co‐based electrocatalysts to date. Moreover, in‐depth mechanistic investigations demonstrate the active phases are the metallic Co4 N core inside with a thin cobalt oxides/hydroxides shell during the OER process. Our finding introduces a new concept to explore the design of high‐efficiency OER electrocatalysts. Abstract : Anordnungen metallischer poröser Co4 N‐Nanodrähte, die durch oberflächliche Oxidation aktiviert wurden, sind hoch effiziente Elektrokatalysatoren für die Sauerstofferzeugung (OER). Als Folge von Synergien zwischen metallischem Charakter, der 1D‐Struktur der porösen Nanodrähte und der beispiellosen 3D‐Elektrodenkonfiguration zählt Co4 N‐NW/CC zu den besten bislang bekannten Co‐basierten OER‐Elektrokatalysatoren.