Abstract
To accelerate the commercial application of rechargeable aqueous Zn-air batteries, it is essential to develop effective catalysts for oxygen evolution reaction (OER). This work reports a novel nanohybrid catalyst comprising amorphous B doped Fe–Ni bimetal hydroxide nano-sheets supported on multiwalled carbon nanotubes for high-efficiency Zn-air batteries, which was synthesized via a facile ultrasonic-assisted BH4− fast reduction reaction. The as-constructed nano-complex with optimal composition exhibited outstanding activity and stability for the OER process, with an overpotential of 219.43 mV for 10 mA cm−2 and a Tafel slope of 43.1 mV dec−1. A fabricated Zn-air battery delivered both excellent energy efficiency and high cycling stability, exhibiting a peak power density of 343.7 mW cm−2 and a favorable stability of over 200 h. The enhanced battery performance demonstrates the nanohybrid to be a promising candidate catalyst for Zn-air batteries with low-cost, high efficiency and long-term stability.
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