In Situ Electrodeposition of Ultralow Pt into NiFe-Metal-Organic Framework/Nickel Foam Nanosheet Arrays as a Bifunctional Catalyst for Overall Water Splitting

Abstract

Exploring highly effective bifunctional electrocatalysts with surface structural advantages and synergistic optimization effects among multimetals is greatly important for overall water splitting. Herein, we successfully synthesized Pt-loaded NiFe-metal-organic framework nanosheet arrays grown on nickel foam (Pt−NiFe-MOF/NF) via a facile hydrothermal-electrodeposition process. Benefiting from large exposed specific surface, optimal electrical conductivity and efficient metal-support interaction endow Pt−NiFe-MOF/NF with highly catalytic performance, exhibiting small overpotential of 261 mV toward oxygen evolution reaction and 125 mV toward hydrogen evolution reaction at a current density of 100 mA cm −2 in alkaline medium. More significantly, the assembled water electrolyzer comprising the Pt−NiFe-MOF/ NF//Pt−NiFe-MOF/NF couple demands a low cell voltage of 1.45 V to reach 10 mA cm −2 . This work renders a viable approach to design dual-functional electrocatalysts with exceptional electrocatalytic activity and stability at high current density, showing the great prospect of water electrolysis for commercial application.

Ir-Doped Core–Shell Hollow Heterogeneous Nanospindles for Electrocatalytic Oxygen Evolution Reaction

“…The XPS spectrum of Ni 2p (Figure b) further demonstrated the different oxidation states of Ni. The distinctive peaks for Ni 2p 1/2 and Ni 2p 3/2 in Ir-MIL-88A@NiFe-LDHs are observed at 874.13 and 856.29 eV, respectively. , The peaks located at 862.31 and 881.44 eV are recognized as satellite peaks associated with Ni 2p. Notably, the Ni 2p 1/2 and Ni 2p 3/2 peaks in Ir-MIL-88A@NiFe-LDHs shifted toward higher binding energies by 0.12 and 0.17 eV, respectively, compared to the corresponding peaks in MIL-88A@NiFe-LDHs, suggesting a possible strong synergistic effect among Ni, Fe, and Ir.…”

Metal–organic frameworks (MOFs) for hybrid water electrolysis: structure–property–performance correlation

“…17–19 It has already been established that MOFs and MOF-based materials show comparatively better performance than transition metal-based materials. 20 A series of MOF-based catalysts such as Ru–Co 9 S 8 , 21 Er-Ni-MOF, 22 Pt–NiFe-MOF, 23 Ru–Co 3 O 4 , 24 RhCoNi-MOF, 25 and so on have been demonstrated recently for water splitting.…”