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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\u2010assisted 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<jats:sub>2<\/jats:sub>O<jats:sub>5<\/jats:sub> as a high\u2010performance electrode material in Li\u2010ion intercalation pseudocapacitor.<\/jats:p>","DOI":"10.1002\/anie.202106481","type":"journal-article","created":{"date-parts":[[2021,8,19]],"date-time":"2021-08-19T06:44:35Z","timestamp":1629355475000},"page":"21377-21383","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["A General Synthesis Strategy for Hollow Metal Oxide Microspheres Enabled by Gel\u2010Assisted Precipitation"],"prefix":"10.1002","volume":"60","author":[{"given":"Jin\u2010Min","family":"Luo","sequence":"first","affiliation":[{"name":"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. 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