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• W4386409310 abstract "Abstract The rational design of the electrocatalysts is paramount to alleviating the global energy and environment crisis. Despite a bright future of MnO 2 shown in energy storage and conversion, the intrinsic low electrical conductivity glooms its application in electrocatalytic reactions like oxygen reduction/evolution reactions (ORR/OER). The doping strategy is applied to equip the self‐supported MnO 2 with enhanced ORR/OER and zinc‐air battery performance. In this work, a class of free‐standing MnO 2 nanorods arrays on carbon paper‐doped with either cobalt or nickel cations are engineered through a simple hydrothermal method. The substitutional doping by Co or Ni that partly replaces the Mn ions in the [MnO 6 ] octahedra brings about the Jahn–Teller distortion that exhibits excellent catalytic performance for ORR and OER. Indeed, the ORR performance reveals that the doping resulted in more positive half‐wave potential (by >20 mV), higher limiting current densities, and an electron transfer number close to four. As for the OER, the doping not only decreases the overpotential at 10 mA cm −2 but also brings about an enhancement in the current density at 1.76 V six times greater than with the undoped MnO 2 catalyst. An optimal concentration of 0.25 in the molar ratio Co/Mn or Ni/Mn is discovered based on the ORR/OER bifunctionality. Homemade rechargeable Zn–air aqueous batteries assembled with doped MnO 2 deliver higher peak power density, higher specific capacity, lower charge voltage, lower charge/discharge voltage, and robust stability." @default.
• W4386409310 created "2023-09-05" @default.
• W4386409310 creator A5026993739 @default.
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• W4386409310 date "2023-09-03" @default.
• W4386409310 modified "2023-10-18" @default.
• W4386409310 title "Free‐Standing Tunnel‐Structured MnO₂ Nanorods‐Doped with Nickel and Cobalt Cations as Bifunctional Electrocatalysts for Zn–Air Batteries" @default.
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• W4386409310 doi "https://doi.org/10.1002/admt.202301142" @default.
• W4386409310 hasPublicationYear "2023" @default.
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