Journal
NANO LETTERS
Volume 16, Issue 10, Pages 6516-6522Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03133
Keywords
K2Ni(CN)(4)/K3Co(CN)(6)-chItosan hydrogel; fibrous carbon aerogels; NiCo alloy; bifunctional electrocatalyst; Zn air battery
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Funding
- National Natural Science Foundation of China [21376122, 21273116]
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Science Engineering [DE-SC0005397]
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The commercialization of Zn-air batteries has been impeded by the lack of low-cost, highly active, and durable catalysts that act independently for oxygen electrochemical reduction and evolution. Here, we demonstrate excellent performance of NiCo nanoparticles anchored on porous fibrous carbon aerogels (NiCo/PFC aerogels) as bifunctional catalysts toward the Zn-air battery. This material is designed and synthesized by a novel K2Ni(CN)4/K3Co(CN)6-chitosan hydrogel-derived method. The outstanding performance of NiCo/PFC aerogels is confirmed as a superior air-cathode catalyst for a rechargeable Zn-air battery. At a discharge-charge current density of 10 mA cm-2, the NiCo/PFC aerogels enable a Zn-air battery to cycle steadily up to 300 cycles for 600 h with only a small increase in the round-trip overpotential, notably outperforming the more costly Pt/C+IrO2 mixture catalysts (60 cycles for 120 h). With the simplicity of the synthetic method and the outstanding electrocatalytic performance, the NiCo/PFC aerogels are promising electrocatalysts for Zn-air batteries.
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