Air‐Cathode with 3D Multiphase Electrocatalyst Interface Design for High‐Efficiency and Durable Rechargeable Zinc–Air Batteries
2021
The development of rechargeable zinc–air batteries is hindered by the low energy-
conversion efficiency and the short cycle life, which are partly due to the
unsatisfactory performance of the oxygen electrocatalysts on the air-cathode. The
low performance of the catalysts is partially due to the complexity of the gas-
involving multiphase interface required for the oxygen cataly sis reactions, and it
is often acquired only for a fraction of the loaded catalyst that is in direct contact
with the 2D surface of the gas diffus ion layer (GDL). A paradigm is proposed for
extending the active region using an enhanced 3D multiphase interface on the
cathode, which comprises abundant active sites with optimized hydrophobicity
and reliable stability. The oxygen reduction reaction (ORR) or the bifunctional
catalyst is embedded into the bulk of the GDL and forms a semihydrophobic
catalyst layer (SCL), whereas an auxiliary hydrophilic oxygen evolution reaction
(OER) catalyst layer integrated onto the GDL assists to reduce the polarization
during the cell charging and improves the cathode durability. An air-cathode
comprising the SCL exhibits an overall performance superior to the conventional
cathode counterparts including cathodes with metal-based catalysts, due to the
enhanced and optimized multiphase interface on the cathode.
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