A General Concurrent Template Strategy for Ordered Mesoporous Intermetallic Nanoparticles with Controllable Catalytic Performance

Abstract

We report a general concurrent template strategy for precise synthesis of mesoporous Pt‐/Pd‐based intermetallic nanoparticles with desired morphology and ordered mesostructure. The concurrent template not only supplies a mesoporous metal seed for re‐crystallization growth of atomically ordered intermetallic phases with unique atomic stoichiometry but also provides a nanoconfinement environment for nanocasting synthesis of mesoporous nanoparticles with ordered mesostructure and rhombic dodecahedral morphology under elevated temperature. Using the selective hydrogenation of 3‐nitrophenylacetylene as a proof‐of‐concept catalytic reaction, mesoporous intermetallic PtSn nanoparticles exhibited remarkably controllable intermetallic phase‐dependent catalytic selectivity and excellent catalytic stability. This work provides a very powerful strategy for precise preparation of ordered mesoporous intermetallic nanocrystals for application in selective catalysis and fuel cell electrocatalysis.

Noble‐Metal‐Based Hollow Mesoporous Nanoparticles: Synthesis Strategies and Applications

“…Precise control of the atomic ratios of Pt/Sn feeds and reaction temperatures resulted in a gradual evolution of the crystal structure from a PtSn random alloy to an ordered Pt 1 Sn 1 intermetallic compound (Figure 6h,i). [ 20 ] This report broadly expands the synthetic capability of the KEST strategy to a library of novel NM‐based HMN materials with more compositional functions.…”

“…PdS HMNs [6e] Selective hydrogenation of 4-nitrophenylacetylene Pt 1 Sn 1 HMNs [20] -Galvanic-replacementassisted surfactanttemplate strategy…”

“…Lv et al recently utilized this method to synthesize AuAg HMNs (Figure 8a). [5d] The key to the synthesis is to introduce a surfactant, which can [20] Copyright 2022, The Authors, published by Wiley-VCH.…”

“…h,i) Reproduced under the terms of the CC‐BY Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0). [ 20 ] Copyright 2022, The Authors, published by Wiley‐VCH.…”

“…Herein, we aim to summarize the progress in the synthesis and applications of NM‐based HMNs, mainly focusing on the results of studies conducted by our two groups ( Table 1 ). [ 5a–f,6e,7–22 ] For the synthesis of NM‐based HMNs, hollow cavities are introduced into NMs. Herein, we discuss five strategies to introduce hollow cavities into MNs: SSTN, surfactant‐templated sequential nucleation (STSN), soft “dual”‐template (SDT), Kirkendall effect in synergistic template (KEST), and galvanic‐replacement‐assisted surfactant‐template (GRST) ( Figure ).…”