Ordered Mesoporous Cobalt–Nickel Nitride Prepared by Nanocasting for Oxygen Evolution Reaction Electrocatalysis. Issue 20 (28th August 2019)

• Record Type: Journal Article
• Authors: Saad, Ali; Cheng, Zhixing; Zhang, Xuyang; Liu, Siqi; Shen, Hangjia; Thomas, Tiju; Wang, Jiacheng; Yang, Minghui
• Is Part Of: Advanced materials interfaces. Volume 6:Issue 20(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-28
• Subjects: hard templating pathway -- NiCo2N ternary nitride -- ordered mesoporous structure -- oxygen evolution reaction; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201900960
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Transition metal nitrides are of considerable interest for energy conversion and storage applications. Given this, synthesis of nanostructured 3D transition metal nitrides is of contemporary interest. Here, a hard templating simple and efficient pathway to synthesize 3D ordered‐mesoporous ternary nitrides NiCo2 N is reported using the mesoporous silica KIT‐6 hard template. Benefitting from its large surface area and accessible pores, uniform shape, and enhanced infiltration capacity for electrolyte, mesoporous NiCo2 N demonstrates superior electrode performance for oxygen evolution reaction (OER) in alkaline medium. As‐synthesized mesoporous ternary nitride NiCo2 N shows desirable performance with very low overpotential (289 mV), and yields ≈10 mA cm −2 geometric current density. This is lower than the values of IrO2 and that of mesoporous binary nitrides CoN and Ni3 N electrocatalysts. NiCo2 N shows a small Tafel slope and smallest semicircle. Moreover, as‐synthesized NiCo2 N exhibits low loss of activity after 10 h test for OER in alkaline solution. This work explores a promising way to produce OER electrocatalyst Co–Ni‐based ternary nitrides for water splitting applications. Abstract : Here, a hard templating approach to synthesize a ternary Co−Ni nitride and binary CoN, Ni3 N with large mesopores and uniform shape is reported. Mesoporous NiCo2 N catalyst exhibits outstanding catalytic performance toward the oxygen evolution reaction in alkaline solution. The superior catalytic can be attributed to its intrinsic activity, abundant active sites, and the large contact area between the catalyst and electrolytes.