Ni₃Fe-N Doped Carbon Sheets as a Bifunctional Electrocatalyst for Air Cathodes

详细信息    查看全文

• 作者：Gengtao Fu ; Zhiming Cui ; Yifan Chen ; Yutao Li ; Yawen Tang and John B. Goodenough
• 刊名：Advanced Energy Materials
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：7
• 期：1
• 全文大小：3418K
• ISSN：1614-6840

文摘

A promising bifunctional electrocatalyst is reported for air cathodes consisting of Ni₃Fe nanoparticles embedded in porous nitrogen-doped carbon sheets (Ni₃Fe/N-C sheets) by a facile and effective pyrolysis-based route with sodium chloride (NaCl) crystals as a template. The Ni₃Fe/N-C sheets show excellent catalytic activity, selectivity, and durability toward both the oxygen-reduction and oxygen-evolution reactions (ORR and OER). They are shown to provide a superior, low-cost cathode for a rechargeable Zn-air battery. At a discharge–charge current density of 10 mA cm⁻², the Ni₃Fe/N-C sheets enable a Zn–air battery to cycle steadily up to 420 h with only a small increase in the round-trip overpotential, outperforming the more costly Pt/C + IrO₂ mixture catalyst (160 h). With the simplicity and scalability of the synthetic approach and its remarkable bifunctional electrocatalytic performance, the Ni₃Fe/N-C sheets offer a promising rechargeable air cathode operating at room temperature in an alkaline electrolyte.