Luo Jin-Min, Sun Tian-Qi, Sun Yong-Gang, Lv Rong-Wen, Cao An-Min, Wan Li-Jun
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), No.2 Zhongguancun North First Street, 100190, Beijing, P. R. China.
University of Chinese Academy of Sciences, No.19(A) Yuquan Road, 100049, Beijing, P. R. China.
Angew Chem Int Ed Engl. 2021 Sep 20;60(39):21377-21383. doi: 10.1002/anie.202106481. Epub 2021 Aug 18.
Hollow metal oxide microspheres (HMMs) have drawn enormous attention in different research fields. Reliable and scalable synthetic protocols applicable for a large variety of metal oxides are in emergent demand. Here we demonstrated that polymer hydrogel, such as the resorcinol formaldehyde (RF) one, existed as an efficient synthetic platform to build HMMs. Specifically, the RF gel forms stacked RF microspheres enlaced with its aqueous phase, where the following evaporation of the highly dispersed water leads to a gel-assisted precipitation (GAP) of the dissolved metal precursor onto the embedded polymeric solids suited for the creation of HMMs. By taking advantage of the structural features of hydrogel, this synthesis design avoids the delicate control on the usually necessitated coating process and provides a simple and effective synthetic process versatile for functional HMMs, particularly Nb O as a high-performance electrode material in Li-ion intercalation pseudocapacitor.
空心金属氧化物微球（HMMs）在不同的研究领域引起了极大的关注。目前迫切需要适用于多种金属氧化物的可靠且可扩展的合成方案。在此，我们证明了聚合物水凝胶，如间苯二酚甲醛（RF）水凝胶，可作为构建HMMs的有效合成平台。具体而言，RF凝胶形成由其水相环绕的堆叠RF微球，其中高度分散的水随后蒸发，导致溶解的金属前驱体在嵌入的聚合物固体上发生凝胶辅助沉淀（GAP），适合于制备HMMs。通过利用水凝胶的结构特征，这种合成设计避免了对通常必需的涂层过程的精细控制，并为功能性HMMs，特别是作为锂离子插层赝电容器中的高性能电极材料的NbO，提供了一种简单有效的通用合成方法。
