The thermal annealing method is regarded as a general and promising method for preparation of carbon-based electrocatalysts. However, this method always suffers from complex and harsh preparative conditions, such as high pyrolysis temperature, protective gas environment, and long synthesis period. Herein, a laser engraving method is introduced for preparation of porous nitrogen-doped graphene layer-enclosed FeNi nanoparticles (FeNi/PNGs), starting with metal organic frameworks (MOFs) as precursors. All the steps were quickly achieved at room temperature and in air environment. Another attractive feature of this method is that FeNi/PNG supported on polyamide (PI) film could directly act as electrocatalytic electrode for hydrogen (HER) and oxygen evolution reaction (OER) without the involvement of dispersion and drop-casting of electrocatalyst ink. The FeNi/PNG shows overpotentials of 132 and 353 mV with Tafel slope of 94 and 80 mV dec^–1 for HER and OER catalyses, respectively. This simple and convenient method could be extended to other catalytic systems with carbon-based materials as electrocatalysts.

中文翻译：

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FeNi纳米颗粒嵌入氮掺杂石墨烯中以电催化释放氢和氧

热退火法被认为是制备碳基电催化剂的通用方法。然而，该方法总是遭受复杂且苛刻的制备条件，例如高的热解温度，保护性气体环境和长的合成时间。在此，从金属有机骨架（MOF）作为前体开始，引入了激光雕刻方法来制备多孔氮掺杂石墨烯层包裹的FeNi纳米颗粒（FeNi / PNG）。所有步骤均在室温和空气环境中快速完成。该方法的另一个吸引人的特点是，聚酰胺（PI）膜上负载的FeNi / PNG可以直接用作氢（HER）和氧释放反应（OER）的电催化电极，而无需参与电催化剂油墨的分散和滴铸。HER和OER催化分别为^–1。这种简单方便的方法可以扩展到其他以碳基材料为电催化剂的催化体系。