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A General Synthesis Strategy for Hollow Metal Oxide Microspheres Enabled by Gel‐Assisted Precipitation
Author(s) -
Luo JinMin,
Sun TianQi,
Sun YongGang,
Lv RongWen,
Cao AnMin,
Wan LiJun
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202106481
Subject(s) - materials science , oxide , precipitation , nanotechnology , calcination , chemical engineering , polymer , coating , chemistry , catalysis , organic chemistry , composite material , meteorology , engineering , metallurgy , physics
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 2 O 5 as a high‐performance electrode material in Li‐ion intercalation pseudocapacitor.