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A NiFe layered double hydroxide-decorated N-doped entangled-graphene framework: a robust water oxidation electrocatalyst
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-03-03 , DOI: 10.1039/c9na00808j Narugopal Manna 1, 2 , Nadeema Ayasha 1, 2 , Santosh K Singh 3 , Sreekumar Kurungot 1, 2
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-03-03 , DOI: 10.1039/c9na00808j Narugopal Manna 1, 2 , Nadeema Ayasha 1, 2 , Santosh K Singh 3 , Sreekumar Kurungot 1, 2
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Three dimensional (3D) porous carbon materials are highly desirable for electrochemical applications owing to their high surface area and porosity. Uniformly distributed porosity in the 3D architecture of carbon support materials allows reactant molecules to access more electrochemically active centres and simultaneously facilitate removal of the product formed during electrochemical reactions. Herein, we have prepared a nitrogen-doped entangled graphene framework (NEGF), decorated with NiFe-LDH nanostructures by an in situ solvothermal method followed by freeze-drying at high vacuum pressure and low temperature. The freeze-drying method helped to prevent the restacking of the graphene sheets and the formation of a high surface area nitrogen-doped entangled graphene framework (NEGF) supported NiFe-LDHs. The incorporation of the NEGF has significantly reduced the overpotential for the electrochemical oxygen evolution reaction (OER) in 1 M KOH solution. This corresponds to an overpotential reduction from 340 mV for NiFe-LDHs to 290 mV for NiFe-LDH/NEGF to reach the benchmark current density of 10 mA cm−2. The preparation of the catalyst is conceived through a low-temperature scalable process.
中文翻译：
NiFe层状双氢氧化物装饰的N掺杂纠缠石墨烯框架：一种强大的水氧化电催化剂
三维（3D）多孔碳材料由于其高表面积和孔隙率而非常适合电化学应用。碳载体材料的 3D 结构中均匀分布的孔隙率允许反应物分子接近更多的电化学活性中心，同时有助于去除电化学反应过程中形成的产物。在此，我们制备了一种氮掺杂的纠缠石墨烯骨架（NEGF），通过原位修饰了 NiFe-LDH 纳米结构。溶剂热法，然后在高真空压力和低温下冷冻干燥。冷冻干燥方法有助于防止石墨烯片的重新堆叠和形成高表面积氮掺杂纠缠石墨烯骨架 (NEGF) 支持的 NiFe-LDH。NEGF 的加入显着降低了 1 M KOH 溶液中电化学析氧反应 (OER) 的过电位。这对应于过电势从 NiFe-LDH 的 340 mV 降低到 NiFe-LDH/NEGF 的 290 mV 以达到 10 mA cm -2的基准电流密度。催化剂的制备是通过低温可扩展工艺进行的。
更新日期：2020-04-24
中文翻译：
NiFe层状双氢氧化物装饰的N掺杂纠缠石墨烯框架：一种强大的水氧化电催化剂
三维（3D）多孔碳材料由于其高表面积和孔隙率而非常适合电化学应用。碳载体材料的 3D 结构中均匀分布的孔隙率允许反应物分子接近更多的电化学活性中心，同时有助于去除电化学反应过程中形成的产物。在此，我们制备了一种氮掺杂的纠缠石墨烯骨架（NEGF），通过原位修饰了 NiFe-LDH 纳米结构。溶剂热法，然后在高真空压力和低温下冷冻干燥。冷冻干燥方法有助于防止石墨烯片的重新堆叠和形成高表面积氮掺杂纠缠石墨烯骨架 (NEGF) 支持的 NiFe-LDH。NEGF 的加入显着降低了 1 M KOH 溶液中电化学析氧反应 (OER) 的过电位。这对应于过电势从 NiFe-LDH 的 340 mV 降低到 NiFe-LDH/NEGF 的 290 mV 以达到 10 mA cm -2的基准电流密度。催化剂的制备是通过低温可扩展工艺进行的。
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