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Ordered Mesoporous Cobalt–Nickel Nitride Prepared by Nanocasting for Oxygen Evolution Reaction Electrocatalysis
Author(s) -
Saad Ali,
Cheng Zhixing,
Zhang Xuyang,
Liu Siqi,
Shen Hangjia,
Thomas Tiju,
Wang Jiacheng,
Yang Minghui
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201900960
Subject(s) - electrocatalyst , overpotential , materials science , nitride , oxygen evolution , tafel equation , mesoporous material , ternary operation , water splitting , chemical engineering , cobalt , electrolyte , transition metal , inorganic chemistry , electrode , nanotechnology , catalysis , metallurgy , chemistry , electrochemistry , organic chemistry , layer (electronics) , photocatalysis , computer science , engineering , programming language
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 NiCo 2 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 NiCo 2 N demonstrates superior electrode performance for oxygen evolution reaction (OER) in alkaline medium. As‐synthesized mesoporous ternary nitride NiCo 2 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 IrO 2 and that of mesoporous binary nitrides CoN and Ni 3 N electrocatalysts. NiCo 2 N shows a small Tafel slope and smallest semicircle. Moreover, as‐synthesized NiCo 2 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.