Controllable pyrolysis of metal−organic frameworks (MOFs) in confined spaces is a promising strategy for the design and development of advanced functional materials. In this study, Co-Co₃O₄@carbon composites were synthesized via pyrolysis of a Co-MOFs@glucose polymer (Co-MOFs@GP) followed by partial oxidation of Co nanoparticles (NPs). The pyrolysis of Co-MOFs@GP generated a core–shell structure composed of carbon shells and Co NPs. The controlled partial oxidation of Co NPs formed Co-Co₃O₄ heterojunctions confined in carbon shells. Compared with Co-MOFs@GP and Co@carbon-n (Co@C-n), Co-Co₃O₄@carbon-n (Co-Co₃O₄@C-n) exhibited higher catalytic activity during NaBH₄ hydrolysis. Co-Co₃O₄@C-II provided a maximum specific H₂ generation rate of 5,360 mL·min⁻¹·g_Co⁻¹ at room temperature due to synergistic interactions between Co and Co₃O₄ NPs. The Co NPs also endowed Co-Co₃O₄@C-n with the ferromagnetism needed to complete the magnetic momentum transfer process. This assembly-pyrolysis-oxidation strategy may be an efficient method of preparing novel nanocomposites.

中文翻译：

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Co-Co 3 O 4 @碳核-金属-有机骨架纳米晶体的壳作为有效的氢气释放催化剂

密闭空间中金属有机骨架（MOF）的可控热解是设计和开发高级功能材料的有前途的策略。在这项研究中，Co-Co ₃ O ₄碳复合材料是通过热解Co-MOFs @葡萄糖聚合物（Co-MOFs @ GP），然后部分氧化Co纳米颗粒（NPs）来合成的。Co-MOFs @ GP的热解产生了由碳壳和Co NPs组成的核-壳结构。Co NPs的受控部分氧化形成了限制在碳壳中的Co-Co ₃ O ₄异质结。与Co-MOFs @ GP和Co @ carbon- n（Co @ C- n）相比，Co-Co ₃ O ₄ @ carbon- n（Co-Co ₃ O ₄ @ C- n）在NaBH ₄水解过程中表现出较高的催化活性。由于Co和Co ₃ O ₄ NP之间的协同相互作用，Co-Co ₃ O ₄ @ C-II在室温下提供的最大比H ₂生成率为5,360 mL·min ^-1 ·g _Co ^-1。Co NP还为Co-Co ₃ O ₄ @ C- n赋予了完成磁动量传递过程所需的铁磁性。这种组装-热解-氧化策略可能是制备新型纳米复合材料的有效方法。