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surface on the oxygen reduction reaction and the H2O2 produc-
tion in a 0.5 M H2SO4 electrolyte. We performed these detailed
investigations with the rotating disk electrode and rotating ring-
disk electrode techniques. The ORR activity and H2O2 production
depended on the catalytic layer thickness and on the catalytic
site density. Carbon-supported CoSe2 nanoparticles have shown
promise as non-precious metal electrocatalysts, with an OCP value
of 0.81 V vs. RHE and a possible four-electron transfer mechanism.
Currently, H2O2 production is still higher than the requirement
(below 5%) for polymer electrolyte membrane fuel cell systems and
the ORR activity is still lower than that of Pt- or Ru-based catalysts.
We plan further investigation to improve the ORR multi-electron
charge transfer and to reduce H2O2 production. This future work
will focus on ways to modify the CoSe2 nanoparticle surface and
methods to reduce CoSe2 particle size.
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