Journal
ACS CATALYSIS
Volume 10, Issue 2, Pages 1152-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b04922
Keywords
RuO2; electrocatalysts; oxygen evolution reaction; Mn-doping; DFT calculation
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Funding
- National Natural Science Foundation [51772283, 21271163]
- National Key RAMP
- D Program of China [2016YFA0401801]
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Currently, RuO2 is a benchmark acidic oxygen evolution reaction (OER) catalyst. Nevertheless, its wide applications are always restricted by slow dynamics and limited durability. This paper reports a type of Mn-doped RuO2 nanocrystals for boosting the OER catalytic performance in acidic media. The catalyst (named Mn-RuO2) is prepared through annealing of Ru-exchanged Mn-based derivative at 300 degrees C. Such Mn-RuO2 exhibits excellent acidic OER activity, with an overpotential of 158 mV at 10 mA cm(-2) and a stability of 5000 cycles in the presence of sulfuric acid (0.5 mol/L). Both structural characterization and theoretical analysis show that the Mn doping in RuO2 can tune the d-band center of Ru active sites and lower antibonding surface-adsorbate states, which leads to a decreased free energy of the rate-determining step, ultimately enhancing the intrinsic activity of RuO2.
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