Advanced Bifunctional Oxygen Reduction and Evolution Electrocatalyst Derived from Surface‐Mounted Metal–Organic Frameworks

Abstract

Metal–organic frameworks (MOFs) and their derivatives are considered as promising catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which are important for many energy provision technologies, such as electrolyzers, fuel cells and some types of advanced batteries. In this work, a “strain modulation” approach has been applied through the use of surface‐mounted NiFe‐MOFs in order to design an advanced bifunctional ORR/OER electrocatalyst. The material exhibits an excellent OER activity in alkaline media, reaching an industrially relevant current density of 200 mA cm−2 at an overpotential of only ≈210 mV. It demonstrates operational long‐term stability even at a high current density of 500 mA cm−2 and exhibits the so far narrowest “overpotential window” ΔEORR‐OER of 0.69 V in 0.1 m KOH with a mass loading being two orders of magnitude lower than that of benchmark electrocatalysts.

Metal–Organic Layers for Electrocatalysis and Photocatalysis

“…These oxyhydroxides showed superior activity with a low overpotential of 220 mV at 10 mA·cm –2 . 114 In situ electrochemical transformation method was developed to prepare ultrathin metal oxide or hydroxide nanosheets with excellent electrocatalytic activity. A Fe doped 2D-Co-NS (Fe:2D-Co-NS@Ni) was prepared and used for OER, 57 exhibiting an ultralow overpotential of 211 mV @ 10 mA·cm –2 .…”

Metal–organic framework based bifunctional oxygen electrocatalysts for rechargeable zinc–air batteries: current progress and prospects

“…The structural design of MOF-based electrocatalysts follows the principle of a large specic surface area, tunable pore size and rich unsaturated metal centers, to expose more active sites and facilitate mass transport in them. [54][55][56] In addition, the clear structure and adjustable chemical coordination of MOFs not only bring great convenience to reveal the related catalytic mechanism, but also provide unlimited possibilities for their application in catalysis including using various metal active sites and appropriate ligands to construct conductive MOFs. 11,12,35,57 In a recent study, 2,3,6,7,10,11-hexaaminotriphenylene reacts with Ni 2+ in NH 3 aqueous solution to form Ni 3 (HITP) 2 .…”

“…The weak coordinate bond in MOFs makes them also good precursors for designing hollow structured materials. 56,64,65 In addition, the morphology of MOFs can be well inherited, which enables catalysts with well dispersibility and various morphologies. Moreover, MOFs can also act as host materials for external active species by introducing additional metal and non-metal heteroatoms.…”

Single‐Atom and Dual‐Atom Electrocatalysts Derived from Metal Organic Frameworks: Current Progress and Perspectives

“…Electrocatalysts based on precious metals usually show outstanding catalytic performance owing to the high intrinsic catalytic activity induced by their electronic structures. For example, noble metal Pt is the best electrocatalysts toward HER and ORR, while IrO 2 and RuO 2 are considered as outstanding electrocatalyst for OER [19–21] . However, the low reserve, high cost, and poor stability of precious metals catalysts limit their commercial applications.…”

“…For example, noble metal Pt is the best electrocatalysts toward HER and ORR, while IrO 2 and RuO 2 are considered as outstanding electrocatalyst for OER. [19][20][21] However, the low reserve, high cost, and poor stability of precious metals catalysts limit their commercial applications. Therefore, the investigation of high efficiency, low cost and stable noble metal-free electrocatalysts is imperatively meaningful and transition metal-based catalysts emerged owing to their moderate catalytic activity and tunable electronic structures to optimize the adsorption of intermediates during the reaction process.…”