Doped lanthanum nickelates with a layered perovskite structure as bifunctional cathode catalysts for rechargeable metal-air batteries.
Rechargeable metal-air batteries have attracted a great interest in recent years because of their high energy density. The critical challenges facing these technologies include the sluggish kinetics of the oxygen reduction-evolution reactions on a cathode (air electrode). Here, we report doped lanthanum nickelates (La2NiO4) with a layered perovskite structure that serve as efficient bifunctional electrocatalysts for oxygen reduction and evolution in an aqueous alkaline electrolyte. Rechargeable lithium-air and zinc-air batteries assembled with these catalysts exhibit remarkably reduced discharge-charge voltage gaps (improved round-trip efficiency) as well as high stability during cycling.
Energy Efficiency and Materials Research Division, Korea Institute of Energy Research , 152 Gajeong-ro, Yuseong-gu, Daejeon, 305-343, Republic of Korea.
Kyu-Nam
KN
Jung
Jong-Hyuk
JH
Jung
Won Bin
WB
Im
Sukeun
S
Yoon
Kyung-Hee
KH
Shin
Jong-Won
JW
Lee
D000388:Air; D017610:Calcium Compounds / Q000737:chemistry*; D002384:Catalysis; D011211:Electric Power Supplies; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry
D017610:Calcium Compounds; D004573:Electrolytes; D007477:Ions; D010087:Oxides; C059910:perovskite; D007811:Lanthanum; D008094:Lithium; D014025:Titanium; D015032:Zinc; D010100:Oxygen