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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)17224-17232
Number of pages9
JournalACS Nano
Volume14
Issue number12
DOIs
Publication statusPublished - 2020 Dec 22

Keywords

  • amorphous alloys
  • hydrogen release
  • hydrolysis of ammonia borane
  • mesoporous materials
  • mesoporous metals
  • metal borides

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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