Metal–organic frameworks (MOFs) containing rich transition metal ions and functional ligands have attracted interest for the non-noble metal oxygen evolution reaction (OER). However, the realization of MOF-based thin films for optimizing and improving electrocatalysis remains a significant challenge. In this work, we report a homodispersed CeO₂ encapsulated cobalt–porphyrin network derived thin film by epitaxial encapsulation approach for optimizing and improving OER performance. The OER activity can be optimized effectively via tuning the thicknesses and calcination temperatures of the cobalt–porphyrin network PIZA-1 thin film. After loading a Ce(III) coordination compound into PIZA-1 by the epitaxial encapsulation method and calcination at 400 °C, a thin film of PIZA-1 derivative with homo-dispersed CeO₂ was obtained successfully for greatly improved electrocatalytic OER performance (an overpotential of 370 mV at 10.0 mA cm⁻²). The work presented here will be extended to the fabrication of other composite thin film electrode materials for high electrocatalytic performance.

中文翻译：

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钴-卟啉网络衍生的薄膜中均匀分散的CeO _2的外延包封，用于高效氧释放反应

包含丰富的过渡金属离子和功能性配体的金属有机骨架（MOF）引起了对非贵金属氧气析出反应（OER）的兴趣。然而，实现用于优化和改善电催化的基于MOF的薄膜仍然是一项重大挑战。在这项工作中，我们报告了通过外延封装方法均匀分散CeO ₂封装的钴-卟啉网络衍生的薄膜，以优化和改善OER性能。通过调节钴-卟啉网络PIZA-1薄膜的厚度和煅烧温度，可以有效地优化OER活性。加载Ce（III）通过外延包封法将配位化合物配入PIZA-1中并在400°C下煅烧，成功获得了具有均匀分散的CeO ₂的PIZA-1衍生物薄膜，从而大大提高了电催化OER性能（在10.0时超电势为370 mV） mA cm ^-2）。此处介绍的工作将扩展到其他具有高电催化性能的复合薄膜电极材料的制造。