Mixed Metal Fe2Ni MIL-88B Metal–Organic
Frameworks Decorated on Reduced Graphene Oxide as a Robust and Highly
Efficient Electrocatalyst for Alkaline Water Oxidation
posted on 2022-02-14, 19:04authored byReza Abazari, Soheila Sanati, Ali Morsali
The development of cost-effective
and efficient oxygen evolution
reaction (OER) catalysts has found increasing popularity due to the
sluggish kinetics of OER, which has hampered the H2 production
by H2O electrolysis. In this study, Fe2Ni MIL-88
(denoted FeNi) was composited by reduced graphene oxide (rGO, denoted
R). Owing to the high porosity and abundant active sites of bimetallic
MOF, proper conductivity of rGO, and the synergistic impact of Ni
and Fe, the optimal composite (R@FeNi (1:1)) offered remarkable OER
activity in alkaline environments. The obtained composite was employed
in the OER, which led to a low overpotential of 264 mV at a current
density of 10 mA cm–2 with a Tafel slope of 62 mV
dec–1. Also, the bimetallic Fe2Ni MIL-88
nanorods grown on rGO led to a reduction in the onset potential of
the OER. These findings exceeded the results of standard IrO2-based catalysts; they are also comparable or even better than the
previously reported MOF-based catalysts.