Fe/Ni Metal–Organic Frameworks and Their Binder-Free Thin Films for Efficient Oxygen Evolution with Low Overpotential

Abstract

Multivariate metal-organic frameworks with active Fe/Ni building blocks that are spatially arranged in an open structure are synthesized and explored for oxygen evolution reaction. The heterogeneity and porosity of this system prove to show synergy effect and give low onset overpotential at 170 mV. These MOFs are further fabricated into thin films over nickel foam by controlled electrochemical deposition to improve the surface conductivity and the overall stability. The Fe/Ni metal-organic framework film exhibits outstanding electrocatalytic activity with low overpotential of 270 mV at 10 mA cm(-2), small Tafel slope, high Faradaic efficiency, high turnover frequency, and great stability.

Electrochemical Exfoliation of Pillared‐Layer Metal–Organic Framework to Boost the Oxygen Evolution Reaction

“…[2,20] 3D-Co can also directly grow onto Ni foam to form 3D-Co@Ni, which can transform to 2D-Co-NS@Ni by electrolysis at 10 mA cm À2 for 35 min ( Figure S25). [2,20] 3D-Co can also directly grow onto Ni foam to form 3D-Co@Ni, which can transform to 2D-Co-NS@Ni by electrolysis at 10 mA cm À2 for 35 min ( Figure S25).…”

Pristine Transition‐Metal‐Based Metal‐Organic Frameworks for Electrocatalysis

“…[181] Zr-clusters can improve the stability of the MOF structure. The approach to designing the multimetallic-MOFs varies.…”

“…The approach to designing the multimetallic-MOFs varies. [181] Mn could adjust the inherent properties of catalysts. The advantages of the multimetallic-MOFs are as follows (Scheme 3).…”

“…In water 1460 283 43 [180] OER FeTPyP-Co 0.1 M NaOH 1470 351 b - [176] OER Phy-Co 2 + /Fe 3 + 1 M KOH -265 36.51 [48] OER Fe/Ni-BTC MOF 0.1 M KOH -270 47 [181] OER [184] a overpotential at 5 mA cm À 2 ; b overpotential at 1 mA cm À 2 ; c overpotential at 2 mA cm À 2 ; d η 10 represents the overpotential at current density of 10 mA cm À 2 . The inset shows that the reduction-peak current at À 1.1 V (vs ferrocyanide) varies linearly with the scan rate 1/2 .…”

“…Fig-Figure 15. [181] Copyright 2016, American Chemical Society. b) The crystal structure of NiCo-UMOFNs.…”