Binderless, Free-Standing Porous Interconnects of Ni–Fe Alloy Decorated Reduced Graphene Oxide for Oxygen Evolution Reaction

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• 作者：Naveen ChandrasekaranSaravanakumar Muthusamy
• 刊名：Langmuir
• 出版年：2017
• 出版时间：January 10, 2017
• 年：2017
• 卷：33
• 期：1
• 页码：2-10
• 全文大小：595K
• ISSN：1520-5827

文摘

We report the synthesis of lightweight, free-standing Ni–Fe@rGO porous interconnects by carbothermal reduction of Ni–FeOx using graphene oxide (GO) as the reducing agent. Here, we take advantage of the oxygen functionalities present in GO to aid in anchoring the metal ions followed by epoxide-assisted Ni–FeOx@GO network formation. When pyrolyzed under inert conditions, Ni–FeOx@GO networks were converted to Ni–Fe@rGO by simple carbothermal metal reduction at 800 °C. The Ni–Fe@rGO monoliths were found to be macroporous, electrically conducting, and electrocatalytic toward oxygen evolution reaction (OER). The monoliths exhibited excellent OER activity yielding a current density of 10 mA cm^–2 at an overpotential of 350 mV versus RHE, Tafel slope of 38 mV decade^–1, and a TOF value of 50 s^–1 on par with the established Ni–Fe based electrocatalysts.