A General and Scalable Approach to Sulfur-Doped Mono-/Bi-/Trimetallic Nanoparticles Confined in Mesoporous Carbon

Abstract

Metal nanoparticles confined in porous carbon materials have been widely used in various heterogeneous catalytic processes due to their enhanced activity and stability. However, fabrication of such catalysts in a facile and scalable way remains challenging. Herein, we report a general and scalable thiol-assisted strategy to synthesize sulfur-doped mono-/bi-/trimetallic nanoparticles confined in mesoporous carbon (S-M@MC, M = Pt, Pd, Rh, Co, Zn, etc.), involving only two synthetic steps, i.e., a hydrothermal process and pyrolysis. The strategy is based on coordination chemistry and hydro-phobic interaction that the metal precursors coordinated with the hydrophobic thiol ligands are located at the hydrophobic core of micelles, in situ confined in the hydrothermally prepared mesostructured polymer, and then converted into sulfur-doped metal nanoparticles confined in MC after pyrolysis. It is demonstrated that the S-PtCo@MC exhibits enhanced catalytic activity and improved durability toward acidic hydrogen evolution reaction due to the confinement effect and S-doping.

Three-dimensional N, P, and O tri-doped porous carbon for multifunctional electrocatalytic reactions

“…1f), which is in favor of the transport of electrolytes and liberation of gas to enhance the electrocatalytic activity. 36,37 The corresponding elemental mapping of 3D-NPOC showcases that the C, N, O, and P elements are evenly distributed in the whole framework of 3D-NPOC (Fig. 1g), well consistent with the XPS spectrogram results, which also indicates the successful preparation of the N, P, O co-doped carbon material.…”

Melamine foam-induced isotropic graphite foam for effective thermal management and electromagnetic interference shielding

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“…The long-range oriented conductive network induces local microcurrent which brings about rapid attenuation of electromagnetic waves in multiple resistance networks. 52,56,58 In general, the absorption loss is related to the electromagnetic wave energy converted from the generated current and polarization relaxation. The existence of defects and folds in the GFs implies the presence of amorphous structures that serve as scattering sites and polarization centers to supply polarization loss.…”

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“…With the rapid development of deformable and wearable electronic devices, as well as an increasingly complex electromagnetic environment, high requirements have been proposed for electromagnetic interference (EMI) shielding materials. [1][2][3] To this end, high-performance, easy-manufacturing, low-cost, flexible, and intelligent EMI shielding materials are required to satisfy the current demands. [4][5][6] Of particular interest are intelligent responsive EMI shielding materials, which exhibit the capacity to dynamically acclimate to evolving scenarios, rendering them exceptionally well-suited for the forthcoming demands in both civilian and military domains.…”