Mesoporous multimetallic nanospheres with exposed highly entropic alloy sites

Yunqing Kang, Ovidiu Cretu, Jun Kikkawa, Koji Kimoto, Hiroki Nara, Asep Sugih Nugraha, Hiroki Kawamoto, Miharu Eguchi, Ting Liao (), Ziqi Sun, Toru Asahi and Yusuke Yamauchi ()
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Yunqing Kang: National Institute for Materials Science (NIMS)
Ovidiu Cretu: National Institute for Materials Science (NIMS)
Jun Kikkawa: National Institute for Materials Science (NIMS)
Koji Kimoto: National Institute for Materials Science (NIMS)
Hiroki Nara: National Institute for Materials Science (NIMS)
Asep Sugih Nugraha: The University of Queensland
Hiroki Kawamoto: Hitachi High-Tech Corporation
Miharu Eguchi: Waseda University
Ting Liao: Queensland University of Technology
Ziqi Sun: Queensland University of Technology
Toru Asahi: Waseda University
Yusuke Yamauchi: Waseda University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Multimetallic alloys (MMAs) with various compositions enrich the materials library with increasing diversity and have received much attention in catalysis applications. However, precisely shaping MMAs in mesoporous nanostructures and mapping the distributions of multiple elements remain big challenge due to the different reduction kinetics of various metal precursors and the complexity of crystal growth. Here we design a one-pot wet-chemical reduction approach to synthesize core–shell motif PtPdRhRuCu mesoporous nanospheres (PtPdRhRuCu MMNs) using a diblock copolymer as the soft template. The PtPdRhRuCu MMNs feature adjustable compositions and exposed porous structures rich in highly entropic alloy sites. The formation processes of the mesoporous structures and the reduction and growth kinetics of different metal precursors of PtPdRhRuCu MMNs are revealed. The PtPdRhRuCu MMNs exhibit robust electrocatalytic hydrogen evolution reaction (HER) activities and low overpotentials of 10, 13, and 28 mV at a current density of 10 mA cm−2 in alkaline (1.0 M KOH), acidic (0.5 M H2SO4), and neutral (1.0 M phosphate buffer solution (PBS)) electrolytes, respectively. The accelerated kinetics of the HER in PtPdRhRuCu MMNs are derived from multiple compositions with synergistic interactions among various metal sites and mesoporous structures with excellent mass/electron transportation characteristics.

Date: 2023
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DOI: 10.1038/s41467-023-39157-2

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