Nanocubic bimetallic organic framework self-templated from Ni precursor as efficient electrocatalysts for oxygen evolution reaction. (3rd May 2019)

• Record Type: Journal Article
• Authors: Yuan, Binbin; Li, Changqing; Liu, Yiwen; Wang, Chao; Guan, Lihao; Li, Kai; Lin, Yuqing
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 23(2019)
• Page Start: 11705
• Page End: 11716
• Publication Date: 2019-05-03
• Subjects: Electrocatalysis -- Self-template -- Bimetallic -- Metal–organic frameworks -- Oxygen evolution reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.03.138
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Developing highly active and robust oxygen evolution reaction electrocatalysts is indispensable to relieve energy crisis. Herein, firstly, the Ni nanocubes precursor as a self-sustaining template is synthesized through a reflow method. Afterward, the nanocubic NiFe bimetallic organic frameworks was formed under the self-assembly approach between the exogenous Fe 2+ and released Ni 2+ from Ni nanocubes with terephthalic acid organic ligand on the Ni nanocubes precursor, i.e Ni nanocubes@MIL-53(NiFe). The synthesized Ni nanocubes@MIL-53(NiFe) exhibit excellent activity, which only requires the overpotential of 271 and 388 mV to deliver the current density of 20 and 100 mA cm −2 in alkaline solution (1.0 M KOH). The noticeable catalytic performance can be ascribed to the aspects as following: 1) Ni nanocubes as a template provides a Ni source during the self-assembled process; 2) the metal-metal coupling effect arisen within the Ni and Fe atom is substantially contributed to the oxygen evolution reaction performance; 3) the abundant active sites, enhanced electron transport ability also endow the superior electrocatalytic oxygen evolution reaction activity; 4) rich carboxyl groups in the metal-organic frameworks structure could enhance the hydrophilicity of the catalysts. We anticipate that our study would extend the design and exploration of active metal-organic frameworks on energy conversion field. Highlights: The self-templated strategy is proposed to design a bimetallic blocky MOF. The Fe-Ni metal-metal coupling effect boosts the OER performance. The Ni NCs control the morphology and prevent the accumulation of catalyst.