Ag nanoparticles anchored on MIL-100/nickel foam nanosheets as an electrocatalyst for efficient oxygen evolution reaction performance

Metal-organic frameworks (MOFs) exhibit excellent application potential in the field of electrocatalysis.In this study,we first prepare MIL-100 nanosheets on nickel foam (MIL-100/NF) and then successfully anchor Ag nanoparticles (NPs) on the nanosheets (Ag@MIL-100/NF) for oxygen evolution reaction(OER) catalysis.This strategy dramatically improves the conductivity of MIL-100 and the Ag NPs are uni-formly dispersed on the nanosheets.The Ag@MIL-100/NF catalyst has excellent electrocatalytic perfor-mance and long-term corrosion resistance,with a low overpotential of 207 mV and a long-term stability of at least 100 h at a current density of 50 mA·cm-2.The experimental results demonstrate that this high OER catalytic performance is due to the improved charge transfer after loading Ag NPs,the com-bination of nanosheets and highly dispersed Ag NPs that expose more active sites and the adjusted chem-ical valence states of Fe and Ni in MIL-100.This work provides a surface decoration approach for the preparation of excellent catalysts directly used in the OER.