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Fabrication and engineering of Ru local structures toward enhanced kinetics of hydrogen generation
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  • Wenzhao Fu,
  • Qianhong Wang,
  • Wenyao Chen,
  • Gang Qian,
  • Jing Zhang,
  • De Chen,
  • Wei-Kang Yuan,
  • Xinggui Zhou,
  • Xuezhi Duan
Wenzhao Fu
East China University of Science and Technology
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Qianhong Wang
East China University of Science and Technology
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Wenyao Chen
East China University of Science and Technology
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Gang Qian
East China University of Science and Technology
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Jing Zhang
East China University of Science and Technology
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De Chen
Norges teknisk-naturvitenskapelige universitet
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Wei-Kang Yuan
East China University of Science and Technology
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Xinggui Zhou
East China University of Science and Technology
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Xuezhi Duan
East China University of Science and Technology
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Abstract

A strategy to boost hydrogen generation from ammonia borane hydrolysis was proposed by engineering Ru local structures via the employment of Cl-free Ru precursors and acid-leaching of the bimetallic Ru-Co catalysts. The effects of Cl and Co were separately investigated by comparing the Cl-free/Cl-containing monometallic Ru catalysts and Co-leaching/Co-containing bimetallic Ru-Co catalysts, respectively. Decoupled from the Co electronic effects (electron transfer from Co to Ru), the Cl geometric effects (site blockage and steric hindrance) were identified as the main factors, which could be further promoted by introducing more low-coordinated Ru sites. The increase of Co content gives rise to more edge-like Ru active sites after acid leaching, with a lower H2O activation barrier for hydrogen production. Consequently, al-Ru1Co with the most edge-like Ru active sites demonstrated a 4.1-fold increase in catalytic activity. The insights revealed here might guide the design and preparation of metal catalysts with the maximum active sites.

Peer review status:UNDER REVIEW

11 Aug 2020Submitted to AIChE Journal
28 Aug 2020Assigned to Editor
28 Aug 2020Submission Checks Completed
30 Aug 2020Reviewer(s) Assigned