Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 258, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117952
Keywords
Ru nanoassembly; Electrocatalysts; HER; HOR; Reversible fuel cells
Funding
- National Natural Science Foundation of China [21471039, 21571043, 21671047, 21871065]
- Natural Science Foundation of Heilongjiang Province [B2015001]
- U.S. Department of Energy, Fuel Cell Technologies Office
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Here, in an effort to prepare Ru-based metal organic frameworks, we developed a one-step solvothermal synthesis for Ru nanoassembly catalysts, which consist of (similar to)4 nm Ru nanoparticles well dispersed on amorphous carbon (Ru/C). The Ru/C catalyst obtained from a mixed solvent of H2O and CH3CH2OH (Ru/C-H2O/CH3CH2OH), featured a chain-like porous structure, provides Pt-like catalytic properties with low overpotentials at -10 mA cm(-2) for the hydrogen evolution reaction (HER) within a wide range of pH values, i.e., 35 mV in 0.5 M H2SO4, 53 mV in 1.0 M KOH, and 93 mV in 3.5 wt% NaCl. Ru/C is also an efficient hydrogen oxidation reaction (HOR) catalyst at all pH values. In the alkaline media, Ru/C-H2O/CH3CH2OH achieves a mass activity of 41.1 mA mg(-1) at an overpotential of 50 mV and a high exchange current density (0.65 mA cm(-2)). The work provides a facile strategy to synthesize highly active Ru/C catalysts for bifunctional HER and HOR electrocatalysis.
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