Highly Conductive Bimetallic Ni–Fe Metal Organic Framework as a Novel Electrocatalyst for Water Oxidation

Abstract

In recent years, metal–organic frameworks (MOFs) have been extensively investigated for diverse heterogeneous catalysis due to their diversity of structures and outstanding physical and chemical properties. Currently, most related work focuses on employing MOFs as porous substrate materials to fabricate confined nanoparticle or heteroatom-doped electrocatalysts which have to be annealed at high temperature before application. However, the annealing process would destroy the structure completely and lose the intrinsic active sites in MOFs framework. Herein, a simple solvothermal process is used to synthesize a series of Fe/Ni bimetallic MOFs. The as-prepared MOFs are applied directly as highly efficient oxygen evolution reaction (OER) electrocatalysts with no post-annealing treatment. The bimetallic FeNi-MOFs show higher OER activity than single metal MOFs and commercial precious RuO2 catalysts. With the optimized FeNi-MOF as the catalyst, the OER current densities of 50 and 100 mA/cm2 can be achieved at the overpotentials of only 270 and 287 mV, respectively. Meanwhile, a small Tafel slope of 49 mV/dec was obtained. Moreover, this catalyst shows high electrochemical stability in strong basic solution. This work demonstrates that through structural optimization, bimetallic and multimetallic MOFs may have promising potentials as advanced catalysts for electrochemical energy conversion.

Preparation of an Fe2Ni MOF on nickel foam as an efficient and stable electrocatalyst for the oxygen evolution reaction

“…Meanwhile, all the prepared samples have almost the same C 1s and O 1s binding energies, indicating that they are in the same chemical states. 42 The OER activities of the as-synthesized samples were evaluated in 1.0 M KOH (pH ¼ 14). Fig.…”

Conductive metal‐organic frameworks: Recent advances in electrochemical energy‐related applications and perspectives

“…In addition, the NiFe‐MOF with the conductivity of approximately 1 ± 0.2 × 10 −3 S/m, prepared by Zhao et al, 100 shows a small overpotential of 240 mV at 10 mA/cm 2 . And the FeNi‐MOF synthesized by Chen et al 101 exhibits the overpotentials of 270 and 287 mV at 50 and 100 mA/cm 2 , respectively. All these impressive cases render favorable evidence to fully support that the Fe‐doped conductive MOFs are beneficial to the OER.…”

An electrochemical immunosensor coupling a bamboo-like carbon nanostructure substrate with toluidine blue-functionalized Cu(ii)-MOFs as signal probes for a C-reactive protein assay

“…Therefore, it is necessary to improve the stability of Tb. As a new type of porous material, metal organic frameworks (MOFs) with functionalized pore surfaces, 22,23 good structural adjustability and high specic surface areas have attracted great attention in many elds [24][25][26][27] such as biosensors. In this paper, Cu(II)-HKUST-1 formed by Cu 2+ and trimesic acid (H 3 BTC) is selected as the signal tag carrier due to its large specic surface area, large pore volume, strong structural adaptability, good hydrothermal stability and uniform pore size distribution.…”