High-performance electrolytic oxygen evolution with a seamless armor core–shell FeCoNi oxynitride. Issue 15 (1st April 2019)

• Record Type: Journal Article
• Authors: Di, Jun; Zhu, Huiyuan; Xia, Jiexiang; Bao, Jian; Zhang, Pengfei; Yang, Shi-Ze; Li, Huaming; Dai, Sheng
• Is Part Of: Nanoscale. Volume 11:Issue 15(2019)
• Page Start: 7239
• Page End: 7246
• Publication Date: 2019-04-01
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr10191d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Highly active, low-cost, and durable electrocatalysts for the water oxidation reaction are pivotal in energy conversion and storage schemes. Abstract : Highly active, low-cost, and durable electrocatalysts for the water oxidation reaction are pivotal in energy conversion and storage schemes. Here we report a nitride-core, oxide-shell-armor structured FeCoNi oxynitride as an efficient oxygen evolution electrocatalyst with a homogeneous nitride (Fe0.70 Co0.56 Ni0.92 N1.0 O0.06 ) core and an oxide (Fe0.48 Co0.1 Ni0.21 N0.05 O1.0 ) shell. The catalyst demonstrated excellent activity for the oxygen evolution reaction with a current density of 10 mA cm −2 at a low overpotential of 0.291 V in alkaline media (1 M KOH), which is superior to the activities of commercial IrO2, RuO2, and Pt/C catalysts and comparable to those of state-of-the-art catalysts ( e.g., NiFe-LDH, NiCo2 O4, O-NiCoFe-LDH). Density functional theory simulations suggested that the incorporation of multiple metal elements can indeed improve the reaction energetics with a synergistic effect from the core–shell structure. This unique structure of a nitride-core with a oxide-shell presents a new form of multimetallic oxynitride with compelling performance in electrolytic oxygen evolution.