Robust tuning metal/carbon heterointerfaces via ketonic oxygen enables hydrogen evolution reaction outperforming Pt/C

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • Jiaying Yu, Nanchang University, University of Padova
  • ,
  • Yunshuo Yang, Nanchang University
  • ,
  • Runtao Jia, Nanchang University
  • ,
  • Kim Daasbjerg
  • Jun Wang, Nanchang University
  • ,
  • Mauro Carraro, University of Padova
  • ,
  • Zhuo Xin, Nanchang University
  • ,
  • Yuxing Huang, Nanchang University
  • ,
  • Troels Skrydstrup

Large-scale synthesis of metal/carbon hybrids with tunable metal/carbon heterointerfaces is vital for practical application of such hybrids in electrocatalysis. Herein, we developed a facile route for large-scale crafting of ultrafine Ru nanoparticles (NPs) anchored on the ketonic C[dbnd]O groups of carbon nanotubes (CNTs) (9.6 g in one batch). From both experimental results and theoretical calculations, we demonstrate that C[dbnd]O (rather than C–O) groups can be exploited to engineer the heterointerface of CNTs and Ru NPs. In fact, the electronic structure of Ru becomes considerably improved because the high polarity of C[dbnd]O facilitates the interface electron transfer of Ru/CNTs. Consequently, the obtained Ru-O-CNTs hybrids with low Ru loading of 1.5 wt% display a small overpotential of 25 mV at 10 mA cm−2 and with fast kinetics as deduced from a small Tafel slope of 20.4 mV dec−1 for hydrogen evolution reaction (HER) in 1 M KOH. Impressively, at 70 mV overpotential, the hybrids exhibit a record mass activity of 20.4 mA μg−1Ru, which is more than 50-fold of that for commercial Pt/C. Therefore, for the first time, we identified the vital role of C[dbnd]O groups for engineering metal/carbon heterointerfaces towards robust and efficient electrocatalysis.

OriginalsprogEngelsk
Artikelnummer147080
TidsskriftApplied Surface Science
Vol/bind529
Antal sider8
ISSN0169-4332
DOI
StatusUdgivet - nov. 2020

Se relationer på Aarhus Universitet Citationsformater

ID: 192086138