Liu Zihan, Li Mingzhong, Xia Yan, Chen Chen, Ning Jing, Xi Xiangyun, Long Ying, Li Zhicheng, Yang Dong, Dong Angang
Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China.
State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200438, China.
J Colloid Interface Sci. 2021 Jul;593:125-132. doi: 10.1016/j.jcis.2021.02.126. Epub 2021 Mar 9.
Self-assembly of colloidal nanoparticles (NPs) into well-defined superstructures has been recognized as one of the most promising ways to fabricate rationally-designed functional materials for a variety of applications. Introducing hierarchical mesoporosity into NP superstructures will facilitate mass transport while simultaneously enhancing the accessibility of constituent NPs, which is of critical importance for widening their applications in catalysis and energy-related fields. Herein, we develop a colloidal co-assembly strategy to construct mesostructured, carbon-coated CoFeO NP superstructures (M-C@CFOSs), which show great promise as highly efficient electrocatalysts for the oxygen evolution reaction (OER). Specifically, organically-stabilized SiO NPs are employed as both building blocks and sacrificial template, which co-assemble with CoFeO NPs to afford binary NP superstructures through a solvent drying process. M-C@CFOSs are obtainable after in situ ligand carbonization followed by the selective removal of SiO NPs. The hierarchical mesoporous structure of M-C@CFOSs, combined with the conformal graphitic carbon coating derived from the native organic ligands, significantly improves their electrocatalytic performance as OER electrocatalysts when compared with nonporous CoFeO NP superstructures. This work establishes a new and facile approach for designing NP superstructures with hierarchical mesoporosity, which may find wide applications in energy storage and conversion.
将胶体纳米颗粒（NPs）自组装成结构明确的超结构，已被认为是制备用于各种应用的合理设计功能材料的最有前景的方法之一。将分级介孔引入NP超结构将促进质量传输，同时提高组成NP的可及性，这对于扩大其在催化和能源相关领域的应用至关重要。在此，我们开发了一种胶体共组装策略来构建介孔结构的、碳包覆的CoFeO NP超结构（M-C@CFOSs），其作为析氧反应（OER）的高效电催化剂具有很大潜力。具体而言，有机稳定的SiO NPs既用作构建单元又用作牺牲模板，它们通过溶剂干燥过程与CoFeO NPs共组装以提供二元NP超结构。经过原位配体碳化，然后选择性去除SiO NPs后可获得M-C@CFOSs。与无孔CoFeO NP超结构相比，M-C@CFOSs的分级介孔结构与源自天然有机配体的保形石墨碳涂层相结合，显著提高了它们作为OER电催化剂的电催化性能。这项工作建立了一种设计具有分级介孔的NP超结构的新颖且简便的方法，这可能在能量存储和转换中找到广泛应用。
