Direct Magnetic Reinforcement of Electrocatalytic ORR/OER with Electromagnetic Induction of Magnetic Catalysts

• DOI: 10.1002/adma.202007525
• Publication Date: 2020-12-18T16:25:20Z
• Authors: Jianhua Yan; Ying Wang; Yuanyuan Zhang; Shuhui Xia; Jianyong Yu; Bin Ding
• Keywords: Overpotential; Nanocages; Nanodot; Oxygen evolution

Abstract Designing stable and efficient electrocatalysts for both oxygen reduction evolution reactions (ORR/OER) at low‐cost is challenging. Here, a carbon‐based bifunctional catalyst of magnetic catalytic nanocages that can direct enhance the activity by simply applying moderate (350 mT) field reported. The catalysts, with high porosity 90% conductivity 905 S m −1 , are created in situ doping metallic cobalt nanodots (≈10 nm) into macroporous carbon nanofibers facile electrospinning method. An external makes magnetized nanomagnets spin polarization, which promote adsorption oxygen‐intermediates electron transfer, significantly improving efficiency. Impressively, half wave‐potential increased 20 mV ORR, overpotential 10 mA cm −2 decreased 15 OER. Compared commercial Pt/C+IrO 2 catalyzed Zn–air batteries deliver 2.5‐fold capacities exhibit much longer durability over 155 h. findings point out very promising strategy using electromagnetic induction to boost activity.