Cobalt-Based Catalysts for Oxygen Reduction / Evolution Reactions in Alkaline Medium
- Cobalt-Based Catalysts for Oxygen Reduction / Evolution Reactions in Alkaline Medium
- 정남기; 박희영; 이상영; 김만수; 남석우; 임태훈; 장종현; 성영은; 유성종
- Issue Date
- 2013 MRS Spring Meeting
- The sluggish oxygen reduction reaction (ORR) has been one of the most
important problems in fuel cell. Many researchers have studied Pt-based alloy
(Pt-M, M = Co, Ni, Fe) catalysts since the alloyed transition metal could make
the d-band center of Pt lowered by the electronic and strain effects. However,
the development of non-precious catalysts has been required since the price of
Pt is too much high in the fuel cell applications. In addition, the hydrogen
production by water splitting has been important for the fuel cell operation.
However, the oxygen evolution reaction (OER) is the key factor in water
splitting involving the hydrogen evolution reaction (HER) because the
multiple electron transfer is demanded as same as in the ORR. In these
regards, non-precious Co-based catalysts such as cobalt oxide and Co-Pi
(cobalt-phosphate complex) have been recently developed for the ORR and
OER catalysts, respectively. Additionally, Manganese oxide was studied as the
bi-functional catalyst for both the ORR and OER. We tried to synthesize
carbon-supported Co nanoparticles involving various P contents. The effects
of P on Co nanoparticles were investigated, and they were applied to ORR
and OER in 0.1 M KOH.
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