Nano Research ( IF 9.9 ) Pub Date : 2021-09-06 , DOI: 10.1007/s12274-021-3816-y Xuanni Lin 1, 2 , Lei Shi 1, 2 , Feng Liu 1, 2 , Changcheng Jiang 1 , Chuangang Hu 1 , Dong Liu 1 , Junjie Mao 3
Atomically dispersed metals stabilized by nitrogen elements in carbon skeleton hold great promise as alternatives for Pt-based catalysts towards oxygen reduction reaction in proton exchange membrane fuel cells. However, their widespread commercial applications are limited by complicated synthetic procedures for mass production. Herein, we are proposing a simple, green mechanochemical approach to synthesize zeolitic imidazolate frameworks precursors for the production of atomically dispersed “Fe-N4” sites in holey carbon nanosheets on a large scale. The thin porous carbon nanosheets (PCNs) with atomically dispersed “Fe-N4” moieties can be prepared in hectogram scale by directly pyrolysis of salt-sealed Fe-based zeolitic imidazolate framework-8 (Fe-ZIF-8@NaCl) precursors. The PCNs possess large specific surface area, abundant lamellar edges and rich “Fe-N4” active sites, and show superior catalytic activity towards oxygen reduction reaction in an acid electrolyte. This work provides a promising approach to cost-effective production of atomically dispersed transition metal catalysts on large scale for practical applications.
中文翻译:
大规模生产植入原子分散 Fe 位点的多孔碳纳米片以促进氧还原电催化
由碳骨架中的氮元素稳定的原子分散金属作为 Pt 基催化剂在质子交换膜燃料电池中用于氧还原反应的替代品具有很大的希望。然而,它们广泛的商业应用受到大规模生产的复杂合成程序的限制。在此,我们提出了一种简单的绿色机械化学方法来合成沸石咪唑酯骨架前体,用于在多孔碳纳米片中大规模生产原子分散的“Fe-N 4 ”位点。具有原子分散的“Fe-N 4 ”的薄多孔碳纳米片(PCNs)通过直接热解盐封的 Fe 基沸石咪唑酯骨架 8 (Fe-ZIF-8@NaCl) 前体,可以制备百克规模的部分。PCNs具有大的比表面积、丰富的层状边缘和丰富的“Fe-N 4 ”活性位点,对酸性电解质中的氧还原反应显示出优异的催化活性。这项工作为大规模生产原子分散过渡金属催化剂的实际应用提供了一种有前景的方法。