Entropy-stabilized metal oxide solid solutions as CO oxidation catalysts with high-temperature stability

Abstract

This work reports a new strategy toward the design of a new class of supported catalysts with intrinsic high-temperature stabilities through entropy maximization.

Across the Board: Sheng Dai on Catalyst Design by Entropic Factors

“…It was demonstrated that Pt(II) can be readily doped into the rock-salt structure of CuO-ZnO-CoO-NiO-MgO. [6] The Pt(II) species (up to 5wt%)c an be readily doped into the lattice without observation of an XRD pattern correspondingt o Pt or PtO NPs under high-temperature conditions. The advantage of this class of SACs involving Pt species was clearly demonstrated with the CO oxidation reactiona saprobe reaction ( Figure 2).…”

Room‐Temperature Synthesis of High‐Entropy Perovskite Oxide Nanoparticle Catalysts through Ultrasonication‐Based Method

“…[1][2][3][4][5][6] HEMs are based on the premise of incorporatingm ultiple components (usually five or more) into as ingle crystal phase to attain unique combination of properties that are otherwise unattainable in conventional solid solutions. [10,12,13] Although conventional perovskites with high-surface area have been synthesized previously, [14,15] high-entropy perovskites with high surfacearea have not been reported previously to the best of our knowledge.Perovskites are an important class of materials that exhibit a wide range of functionality,m aking them desirable for use in different areas of application including heterogenous catalysis. Examples include high-entropy metal dibor-ides, [4] high-entropy nitrides, [8,9] and high-entropy metal oxides (HEMOs).…”

“…Ta king advantage of the acoustic cavitation phenomenon in theu ltrasonication process, BaSr(ZrHf-Ti)O 3 ,B aSrBi(ZrHfTiFe)O 3 and Ru/BaSrBi(ZrHfTiFe)O 3 nanoparticles were crystallized as single-phase perovskite structures through ultrasonication exposure withoutc alcination. [10] More recently,J iang et al extended the HEMO study to include perovskite-type oxides with six and seven metallice lements. [1][2][3][4][5][6] HEMs are based on the premise of incorporatingm ultiple components (usually five or more) into as ingle crystal phase to attain unique combination of properties that are otherwise unattainable in conventional solid solutions.…”

“…[10] More recently,J iang et al extended the HEMO study to include perovskite-type oxides with six and seven metallice lements. [10,12,13] Although conventional perovskites with high-surface area have been synthesized previously, [14,15] high-entropy perovskites with high surfacearea have not been reported previously to the best of our knowledge. Although the particle size distribution of the synthesized perovskites was not reported, several studies have demonstrated that such extreme temperatured uring the synthetic process causes coagulation of grain boundaries, leadingt ot he formation of clumps, and consequent reduction in the available surfacea rea for reactions.…”

“…[7] Amongt his novel class of crystalline materials, high-entropy alloys were first reported in 2004 by the independentp ioneering works of Cantor et al and Yeh et al [5,6] Recent studies have extended the high-entropy concept to include the ionic compounds, in which five or more metallice lements have been used to populate as inglec ation sublattice to introduce highc onfigurational entropyi nto the crystal structure. [10] More recently,J iang et al extended the HEMO study to include perovskite-type oxides with six and seven metallice lements. [10] More recently,J iang et al extended the HEMO study to include perovskite-type oxides with six and seven metallice lements.…”