Ordered Mesoporous Cobalt–Nickel Nitride Prepared by Nanocasting for Oxygen Evolution Reaction Electrocatalysis

Advanced Materials Interfaces - Tập 6 Số 20 - 2019
Ali Saad1, Zhixing Cheng1, Jing Wang1, Siqi Liu1, Minghui Yang1, Tiju Thomas2, Jiacheng Wang3
1Solid State Functional Materials Research Laboratory, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS), 315201, Ningbo, China
2Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Adyar, Chennai, 600036, Tamil Nadu, India
3State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China

Tóm tắt

AbstractTransition 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 NiCo2N 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 NiCo2N demonstrates superior electrode performance for oxygen evolution reaction (OER) in alkaline medium. As‐synthesized mesoporous ternary nitride NiCo2N 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 Ni3N electrocatalysts. NiCo2N shows a small Tafel slope and smallest semicircle. Moreover, as‐synthesized NiCo2N 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.

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Advanced Materials Interfaces

Tập 6 Số 20

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