Multimetallic glycerolate as a precursor template of spherical porous high-entropy oxide microparticles

Emerging high-entropy coordination compounds and their derivatives for energy application

“…Using this approach, the literature generally reports the use of solvothermal processes for the preparation of HE-glycerolates, 12,26,27 by mixing a metal source with glycerol in isopropanol (or other alcohols) and subjecting it to a solvothermal reaction typically in the temperature range of 140–250 °C. 18 For instance, Gonçalves et al 12 synthesized high-entropy NiCoMnZnMg-glycerolate particles with low crystallinity and nearly equimolar metal concentrations of 20.06, 21.80, 21.22, 18.87, and 18.05% for Ni, Co, Mn, Mg and Zn; respectively. It is important to mention that a few studies report the preparation of HE-glycerolates, 12,26,27 indicating that there is much to be explored in order to fully understand the properties and design of new high-entropy based materials.…”

“…18 For instance, Gonçalves et al 12 synthesized high-entropy NiCoMnZnMg-glycerolate particles with low crystallinity and nearly equimolar metal concentrations of 20.06, 21.80, 21.22, 18.87, and 18.05% for Ni, Co, Mn, Mg and Zn; respectively. It is important to mention that a few studies report the preparation of HE-glycerolates, 12,26,27 indicating that there is much to be explored in order to fully understand the properties and design of new high-entropy based materials.…”

“…Inspired by the above considerations, recently Gonçalves et al 12 developed new porous HEOs derived from HE-glycerolate containing five metals, such as Ni, Co, Mn, Zn and Mg (NiCoMnZnMg-glycerolate). Interestingly, the composition of the HE-glycerolate precursor and temperature of the annealing process play important roles in determining porosity, crystallinity, and phase separation in HEOs.…”

“…In addition, these sol–gel and solvothermal strategies could be applied for the rational design and synthesis of the HE-CCs with various compositions and micro- and nanostructures, opening a new avenue to explore novel properties of outstanding HEMs and extend their application. 12,28 In fact, analogous to HE-MOFs, HE-glycerolates, HE-polyphenols and other HE-CCs can be considered excellent precursors with great prospects for the preparation of many other versatile and multifunctional porous HEMs, such as HE-hydroxides, HE-sulfides, HE-phosphides, and HE-carbides with homogeneous structures and various morphologies including porous, hollow, or yolk–shell features.…”

“…11 In fact, more recently the concept of high-entropy was introduced into some typical coordination compounds (HE-CCs) such Prussian blue analogues (HE-PBAs)/hexacyanoferrates (HE-HCFs) and other metal–organic frameworks (HE-MOFs), as well as metal-glycerolates (HE-glycerolates) and metal-polyphenol coordination polymers (HE-PCPs) which may facilitate new opportunities in electrochemical applications. 12 In fact, HE-CCs have piqued significant attention in recent years and offer several advantages such as structural diversity, enhanced functionality, tunable properties, stability, robustness and multifunctionality which make them attractive for a wide range of applications, including catalysis, gas storage and separation, sensing, drug delivery, energy conversion and storage, and more. 13–15…”