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Interlayer expanded lamellar CoSe2 on carbon paper as highly efficient and stable overall water splitting electrodes.
- Source :
-
Electrochimica Acta . Jul2017, Vol. 241, p106-115. 10p. - Publication Year :
- 2017
-
Abstract
- Water splitting associated with the conversion and storage of renewable energy is considered to be the most significant strategy to create hydrogen. Herein, an efficient self-supported electrode was developed by in-situ growth of interlayer expanded lamellar cobalt diselenide (CoSe 2 ) nanosheets (NS) on carbon paper (CP) substrate (CoSe 2 NS@CP). The analyses of TEM, SEM and XRD confirmed that the CP is homogeneously coated by few stacking layers of interlayer expanded lamellar structured CoSe 2 . This rationally designed nanostructure can provide more active sites for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The bifunctional electrode exhibits high electrocatalytic performance with −128 mV vs. RHE onset potential for the HER in 0.5 mol dm −3 H 2 SO 4 and +1521 mV vs. RHE for the OER in 1.0 mol dm −3 KOH. Besides, small electrolysis potentials of −201.1 mV vs. RHE and +1636 mV vs. RHE are needed to drive the HER and OER at current density of 100 mA cm −2 . Finally, a small overall cell voltage ( ca. +1.75 V) was used to drive the water splitting reaction in 1.0 mol dm −3 KOH. The CoSe 2 NS@CP electrode showed both excellent catalytic activity with overall current density of 100 mA cm −2 at 2.13 V and tremendous durability with negligible decrease in potential at a constant current of 20 mA cm −2 for more than 30 hours. Thus this rationally designed electrode material can be readily applied for large-scale water splitting process. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CARBON paper
*WATER electrolysis
*COBALT compounds
*ELECTRODES
*ENERGY conversion
Subjects
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 241
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 123196144
- Full Text :
- https://doi.org/10.1016/j.electacta.2017.04.084