Megumi Mukoyoshi

Hybrid materials of metal-organic frameworks (MOFs) and nanoparticles (NPs) have attracted significant attention because of the wide variety of attractive properties derived from the two components. In the last decade, the development of synthesis techniques for NP/MOF composites was particularly significant. In the field of catalysis in particular, various synergistic effects that make the composites attractive catalysts have been reported. However, the role of MOFs in the composite catalysts i

Recently, mixed-metal metal-organic frameworks (MOFs) have been attracting much attention in various fields. In this study, we have systematically investigated the magnetic properties of Co_<i>x</i>Ni_1-<i>x</i>-MOF-74 [Co_2<i>x</i>Ni_{2(1-<i>x</i>)}(dhtp), where H₄dhtp = 2,5-dihydroxyterephthalic acid] with two different kinds of metals (Co and Ni) across the composition range 0 ≤ <i>x</i> ≤ 1. Bimetallic Co_<i>x</i>Ni<sub>1-<i>x</i></s

We report the synthesis of novel RuIn solid-solution alloy nanoparticles (NPs) via the electrochemical cleaning of RuIn@InOx NPs. By alloying In to Ru, the RuIn NPs exhibited enhanced hydrogen evolution reaction (HER) activity compared with monometallic face-centered cubic (fcc) Ru NPs. Furthermore, the HER activity of RuIn NPs was comparable to that of commercial Pt catalysts. At a current density of 10 mA cm–2, RuIn NPs displayed a lower overpotential of 30.7 mV compared to monometallic fcc Ru

We first report the facile synthesis of metal-carbon composites consisting of metal nanoparticles (NPs) and different types of carbon species: onion-like and amorphous carbon, Ni@onion-like carbon and Co@amorphous carbon. By simply changing the metal species in an isostructural metal-organic framework, thermal decompositions of MOF-74 directly afforded different types of metal NPs and carbon composites, which exhibited good electrical conductivity. In particular, the Ni@onion-like carbon, having

Alloy nanoparticles based on platinum group metals (PGMs) have been intensively investigated in various fields, especially in catalysis. Recently, the scope of alloying has expanded to include not only d‐block transition metals but also p‐block elements, which have a wide range of properties that are very different from those of d‐block transition metals. By alloying PGMs with p‐block elements, the electronic structure and surface properties of the catalysts can be tuned, enhancing their catalyt

We demonstrate physically consistent and interpretable extended X-ray absorption fine structure (EXAFS) curve-fitting analyses for estimating element-selective local structures in multielement alloy nanoparticles (MEA NPs). The difficulty in analyzing multielement systems originates from the too large number of independent structural parameters to fit, far exceeding the information content of the typical experimental data. Herein, this challenge is overcome by simultaneously fitting multiple dat

High-throughput synthesis of multi-element alloy nanoparticles (MEA NPs) is essential for accelerating the discovery of advanced materials with complex compositions. Herein, we developed an automated continuous-flow reactor system capable of synthesising a wide variety of MEA NPs under controlled solvothermal conditions (up to 400 °C and 35 MPa). The system demonstrates a high screening throughput, capable of preparing up to 20 distinct samples in a single, automated run, with each synthesis req