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Nanosheet-Derived Ultrafine CoRuOx@NC Nanoparticles with a Core@Shell Structure as Bifunctional Electrocatalysts for Electrochemical Water Splitting with High Current Density or Low Power Input
journal contribution
posted on 2020-08-01, 12:03 authored by Qifeng Yang, Yuchen Cui, Qiaoyan Li, Jiahao Cai, Dan Wang, Lai FengA series
of ultrafine core@shell electrocatalysts (CoRuOx@NC) are prepared using oleylamine (OA)-passivated
metal-oxide nanosheets (CoRuOy@OA) as
single precursors. The optimal catalyst Co0.8Ru0.2Ox@NC composed of the N-doped carbon
(NC) shell and the endohedral hybrid of metal/metal oxide exhibits
excellent catalytic activities in alkaline media with a low overpotential
of 36 mV for hydrogen evolution reaction, 278 mV for oxygen evolution
reaction, and an ultralow potential of −19 mV for hydrazine
oxidation reaction (HzOR) at 10 mA cm–2. When used
as both cathode and anode catalysts for overall water splitting, Co0.8Ru0.2Ox@NC drives
10/500 mA cm–2 with a cell voltage as low as 1.55/1.86
V and maintains long-term stability at 500 mA cm–2. Moreover, for HzOR-assisted electrochemical water splitting (EWS),
the Co0.8Ru0.2Ox@NC-based electrode couple requires ultralow cell voltages of merely
79/674 mV to deliver 10/100 mA cm–2 with excellent
long-term durability at 100 mA cm–2. The success
of the present electrocatalyst shall be attributed to the combined
effect of minor RuOx incorporation and
carbon encapsulation, which results in not only enhanced catalyst
conductivity and charge transfer kinetics but also surface-enriched
active sites and improved intrinsic catalytic activity. Thus, our
work may pave a new opportunity for rational design and facile synthesis
of bifunctional electrocatalysts for EWS operated with high current
density or low power input.
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Keywords
catalyst Co 0.8 Ru 0.2 O xCoRuO ypower input278 mVOAElectrochemical Water SplittingNC Nanoparticleshydrazine oxidation reactionCoRuO xHzOR-assisted electrochemical water...Nanosheet-Derived Ultrafine CoRuO xhydrogen evolution reactionultralow cell voltagesEWScell voltagewater splittingcharge transfer kineticscmoxygen evolution reactionCo 0.8 Ru 0.2 O xBifunctional ElectrocatalystsmANC-based electrode coupleanode catalystscatalyst conductivity36 mVN-doped carboncarbon encapsulationRuO x incorporationLow Power Inputbifunctional electrocatalysts
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