Amorphous Alloy Architectures in Pore Walls: Mesoporous Amorphous NiCoB Alloy Spheres with Controlled Compositions via a Chemical Reduction

Yunqing Kang, Bo Jiang, Juanjuan Yang, Zhe Wan, Jongbeom Na, Qian Li, Hexing Li, Joel Henzie, Yoshio Sakka, Yusuke Yamauchi, Toru Asahi*

*この研究の対応する著者

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Amorphous bimetallic borides are an emerging class of catalytic nanomaterial that has demonstrated excellent catalytic performance due to its glass-like structure, abundant unsaturated active sites, and synergistic electronic effects. However, the creation of mesoporous Earth-abundant bimetallic metal borides with tunable metal proportion remains a challenge. Herein, we develop a sophisticated and controllable dual-reducing agent strategy to synthesize the mesoporous nickel-cobalt boron (NiCoB) amorphous alloy spheres (AASs) with adjustable compositions by using a soft template-directed assembly approach. The selective use of tetrabutylphosphonium bromide (Bu4PBr) is beneficial to generate well-defined mesopores because it both moderates the reduction rate by decreasing the reducibility of M2+ species and prevents the generation of soap bubbles. Our meso-Ni10.0Co74.5B15.5 AASs generate the highest catalytic performance for the hydrolytic dehydrogenation of ammonia borane (AB). Its high performance is attributed to the combination of optimal synergistic effects between Ni, Co, and B as well as the high surface area and the good mass transport efficiency due to the open mesopores. This work describes a systematic approach for the design and synthesis of mesoporous bimetallic borides as efficient catalysts.

本文言語English
ページ(範囲)17224-17232
ページ数9
ジャーナルACS Nano
14
12
DOI
出版ステータスPublished - 2020 12 22

ASJC Scopus subject areas

  • 材料科学(全般)
  • 工学(全般)
  • 物理学および天文学(全般)

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