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N-doped graphene anchored ultrasmall Ir nanoparticles as bifunctional electrocatalyst for overall water splitting
- Source :
- Green Energy & Environment. 7:1111-1118
- Publication Year :
- 2022
- Publisher :
- Elsevier BV, 2022.
-
Abstract
- Seeking for extremely active and durable bifunctional electrocatalysts towards the overall water splitting possesses a strategic significance on the development of sustainable and clean energy for the replacement of fossil fuels. Ir-based nanomaterials are deemed as one of the most high-efficiency oxygen evolution reaction electrocatalysts while the hydrogen evolution reaction performance is unfavorable. In this work, we report a one-pot hydrothermal synthesis of N-doped graphene anchored Ir nanoparticles (Ir/N-rGO) with ultrasmall particle size (∼2.0 nm). Apart from the predictably superior OER performance, the resultant Ir/N-rGO also displays excellent hydrogen evolution reaction (HER) performance, requiring merely 76 and 260 mV overpotentials to achieve the current density of 10 mA cm-2 towards HER and OER, respectively. When applied as the bifunctional electrodes for overall water splitting, Ir/N-rGO needs a lower overpotential (1.74 V) to achieve a current density of 50 mA cm-2 in alkaline solution, exceeding that of Pt/C and RuO2 couple (1.85 V). Thus, the as-fabricated Ir/N-rGO has a commendable prospect in the practical application of alkaline water electrocatalysis.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Graphene
Oxygen evolution
02 engineering and technology
Overpotential
010402 general chemistry
021001 nanoscience & nanotechnology
Electrocatalyst
01 natural sciences
0104 chemical sciences
Nanomaterials
law.invention
chemistry.chemical_compound
chemistry
Chemical engineering
law
Hydrothermal synthesis
Water splitting
0210 nano-technology
Bifunctional
Subjects
Details
- ISSN :
- 24680257
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Green Energy & Environment
- Accession number :
- edsair.doi...........fe8eaade6778d61834277cde5e2a0938