Novel NiFe-LDH@Ni-MOF/NF heterostructured electrocatalysts for efficient oxygen evolution

Abstract

Increasing active sites and improving long-term stability are of great significance for electrocatalysts in water splitting. Herein, we report a simple and metal-economize synthesis of NiFe-LDH@Ni-MOF/NF (Nickle iron layered double hydroxide@Nickle metal-organic frameworks/Nickel foam) heterostructures. The NiFe-LDH@Ni-MOF/NF electrocatalyst possesses ultralow oxygen evolution overpotentials of 205, 231, and 248 mV at current densities of 10, 50, and 100 mA cm^–2, respectively, with a small Tafel slope of 43.7 mV dec⁻¹, benefiting from the exposure of edge defects and catalytic active sites, and reduced diffusion pathways for mass and charge transfer, making it one of the best non-noble-metal-based electrocatalysts for oxygen evolution.

GRAPHICAL ABSTRACT

IMPACT STATEMENT

We provide a simple way for synthesizing high-activity and durable LDH/MOF electrocatalysts, without extra metal additions in Ni-MOF in situ synthesis.

KEYWORDS:

• Oxygen evolution reaction
• layered double hydroxides
• metal-organic frameworks
• phase interface

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51702212, 62071300], Chenguang Scholar Project of Shanghai Education Commission [19CG52, 19CG53], Science and Technology Commission of Shanghai Municipality [19ZR1435200, 20490761100, 21ZR1444200], Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-07-E00015], Program of Shanghai Academic Research Leader [19XD1422900], Cross-program of Medical & Engineering (University of Shanghai for Science and Technology), and the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [grant number 2021–K33].