Journal
NANOSCALE ADVANCES
Volume 2, Issue 2, Pages 792-797Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9na00725c
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Funding
- Natural Science Foundation of China [21771020, 21671019, 21961024, 21961025]
- Inner Mongolia Natural Science Foundation [2018JQ05, 2019BS02007, 2019BS02008, 2017BS0205]
- Nano Innovation Institute (NII) of Inner Mongolia University for Nationalities (IMUN)
- Inner Mongolia Autonomous Region Funding Project for Science & Technology Achievement Transformation [CGZH2018156]
- Inner Mongolia Autonomous Region Incentive Funding Guided Project for Science & Technology Innovation (2016)
- Doctoral Scientific Research Foundation of Inner Mongolia University for the Nationalities [BS245, BS379, BS437]
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Constructing noble metal-free electrocatalytically active sites for the simultaneous hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution is key to realizing electricity-driven water splitting in practical applications. Here, we rationally designed Co(OH)(2)@CoSe nanorods (NRs) as an excellent bifunctional electrocatalyst by an in situ electrochemical transformation strategy, where the Co-based nanorod template was converted into Co(OH)(2)@CoSe at the cathode. The obtained electrode exhibits superior electrocatalytic activity for both the HER (overpotential of 208 mV at 20 mA cm(-2)) and the OER (268 mV at 20 mA cm(-2)) at high current density in a 1 M KOH solution. The theoretical calculations and experimental evidence indicate that the chemical coupling Co-OH active site between Co(OH)(2) and CoSe regulates the hydrogen adsorption and desorption energy and fast electron transfer capability, which is responsible for the improved HER. Moreover, the Co(OH)(2)@CoSe NRs can be further converted into CoOOH nanosheets which serve as OER active sites. Toward practical electrolytic cell applications, the Co(OH)(2)@CoSe nanorods as both the cathode and anode achieved a current density of 100 mA cm(-2) at 1.94 V for overall water splitting, better than that of noble metal-based electrocatalysts.
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