Abstract
Electrocatalytic oxygen evolution reaction (OER) is an important half reaction for energy conversion and storage, which possesses low OER efficiency due to the multistep proton-coupled electron transfer. Herein, B-doped iron-cobalt tannate nanoparticles (B-doped FeCoTA) are synthesized by one-step hydrothermal method. It is proved that the optimized B-doped FeCoTA exhibits excellent electrocatalytic performance for OER with a low overpotential of 306 mV at a current density of 10 mA cm−2, a small Tafel slope of 28 mV dec−1, a high double-layer capacitance of 6.31 mF cm−2 and excellent OER stability with a low potential of 1.55 V (vs RHE) at 10 mA cm−2, which is ascribed to the synergistic effect between bimetallic and heteroatom doping. The B incorporation can greatly enhance the electrical conductivity between metals, facilitate electron transfer and material exchange, thus greatly reducing reaction dynamics and strengthening OER performance. This work can provide a good strategy for the design and development of new efficient and stable OER electrocatalysts.
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