Hydrogen is a renewable, secure and environmentally friendly source of energy, and thus it is important to find an effective way to prepare hydrogen evolution reaction (HER) catalysts. Herein, we report a strategy to prepare noble metal‐decorated porous carbon‐based nanomaterials by direct carbonization of porphyrinic metal‐organic frameworks of M‐PCN‐222(Hf) that are also denoted as M‐PMOF‐2(Hf) (M=Rh, Ir or Pt) at an elevated temperature under an Ar atmosphere. The M‐PCN‐222(Hf) samples with the nanorod shape are synthesized by the self‐assembly of M‐TCPP (TCPP=tetrakis(4‐carboxyphenyl)porphyrin) and HfCl₄, and the noble metals within the frameworks are uniformly dispersed at the atomic level. Through pyrolysis at 600, 700 or 800 °C and followed by acid etching with HF, noble metal‐decorated porous carbon‐based nanomaterials that are termed as M‐PCN‐222(Hf)‐T (T is the pyrolysis temperature) are obtained, in which the noble metal nanoparticles are dispersed uniformly within the porphyrin ligand‐derived nitrogen‐doped carbon matrix. Inheriting the structural characteristics of the MOF template, M‐PCN‐222(Hf)‐T display relatively high BET surfaces up to 310 m²⋅g⁻¹ and large mesopores with an average pore diameter around 6 nm. Catalytic results show that the prepared M‐PCN‐222(Hf)‐T samples display high HER catalytic activities in a 0.5 M H₂SO₄ solution (pH=0.36).

中文翻译：

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卟啉金属有机骨架衍生的基于碳的纳米材料用于氢释放反应

氢气是一种可再生，安全且环保的能源，因此，找到一种有效的方法来制备析氢反应（HER）催化剂非常重要。本文中，我们报告了一种策略，通过直接碳化M-PCN-222（Hf）的卟啉金属-有机骨架来制备贵金属装饰的多孔碳基纳米材料，该骨架也称为M-PMOF-2（Hf）（M ＝ Rh，Ir或Pt）在Ar气氛下在升高的温度下。通过M-TCPP（TCPP =四（4-羧基苯基）卟啉）和HfCl ₄的自组装合成具有纳米棒形状的M‐PCN‐222（Hf）样品，并且框架内的贵金属在原子水平上均匀分散。通过在600、700或800°C的温度下热解，然后用HF进行酸蚀刻，可获得称为M-PCN-222（Hf）-T的贵金属装饰的多孔碳基纳米材料（T为热解温度） ，其中贵金属纳米颗粒均匀地分散在卟啉配体衍生的氮掺杂碳基质中。继承MOF模板的结构特点，M-PCN-222（HF）-T显示相对高的BET表面高达310米² ⋅g ^-1和大介孔周围6纳米的平均孔径。催化结果表明，制备的M-PCN-222（Hf）-T样品在0.5 MH ₂ SO _4中显示出较高的HER催化活性。 溶液（pH = 0.36）。