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baresi6milan

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[资源] 最新angew Oxygen reduction文献

Co1xS–Graphene Hybrid: A High-Performance Metal Chalcogenide
Electrocatalyst for Oxygen Reduction**
Hailiang Wang, Yongye Liang, Yanguang Li, and Hongjie Dai*

Owing to their high energy-conversion efficiency, low or even
zero emission, and high energy and power density, fuel cells
such as proton-exchange membrane fuel cells (PEMFC) and
direct methanol fuel cells (DMFC) have drawn tremendous
attention as potential clean and efficient power sources for
both electric vehicles and portable electronics.[1, 2] A major
limiting factor of energy-conversion efficiency for present fuel
cells is the sluggish kinetics of the oxygen reduction reaction
(ORR) at the cathode.[3–9] Platinum and its alloys have been
so far the most active ORR catalysts.[3–9] However, the
prohibitive cost, scarcity, and declining activity of Pt-based
catalysts have hindered widespread application and commercialization
of fuel cells.[3–9] Consequently, alternative electrocatalysts
based on nonprecious metals have been actively
pursued.[3–9]
Cobalt sulfides have been investigated as ORR catalyst
with the highest activity among all chalcogenides of nonprecious
metals in acidic solution.[2,10–16] Theoretical studies
predicted electrocatalytic activity of Co9S8 similar to that of
Pt via a four-electron ORR pathway.[11] However, current
ORR catalysts based on cobalt sulfides and cobalt selenides
have exhibited activities far lower than that of Pt.[12–16]
Moreover, it has been shown that two-electron reduction is
the dominant reaction pathway for cobalt sulfide catalysts,
especially at potentials higher than 0.5 V versus the reversible
hydrogen electrode (RHE).[2] It is thus highly desirable to
design and synthesize high-performance cobalt chalcogenide
based electrocatalyst materials capable of catalyzing fourelectron
ORR.
Here we describe a novel cobalt sulfide–graphene hybrid
electrocatalyst for ORR, obtained by controlled two-step
synthesis of Co1xS nanoparticles on reduced graphene oxide
(RGO).
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牛人呀,看来载体上是提升催化性能的一个很好的方向。
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