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Self-assembly of homointerface engineered IrCo0.14 bracelet-like nanorings as efficient and stable bifunctional catalysts for electrochemical water splitting in acidic media
- Source :
- Electrochimica Acta. 337:135738
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- To develop robust and highly active bifunctional electrocatalysts for electrochemical water splitting in acidic media is still a great challenge for proton exchange membrane (PEM) electrolyzer. Herein, a self-assembled IrCox nanorings (NRs) with bracelet-like architecture is fabricated as a bifunctional high-efficient overall water splitting electrocatalyst by a facile, controllable and surfactant-free strategy. The unique nanoring architecture enriches in abundant homointerface and strong synergistic electronic interaction between Ir and Co. The optimized IrCo0.14 NRs exhibits remarkable electrocatalytic performance with a low overpotential of 16 mV for hydrogen evolution reaction (HER) and 278 mV for oxygen evolution reaction (OER) at 10 mA cm−2 in 0.1 M HClO4, respectively, significantly outperforming the commercial Pt/C, Ir/C and reported Ir-based catalysts. As both anode and cathode, a cell voltage of only 1.53 V to reach 10 mA cm−2 is obtained for overall water splitting and no obvious activity loses after a long-term electrolysis for 14 h. Combined with a PV cell, this catalyst also shows excellent water splitting performance with a solar-to-hydrogen conversion efficiency of 12.8%. This work provides further insights on designing promising and efficient bifunctional electrocatalysts for clean energy electrochemical conversion in the future.
- Subjects :
- Electrolysis
Materials science
General Chemical Engineering
Oxygen evolution
Proton exchange membrane fuel cell
02 engineering and technology
Overpotential
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
Electrocatalyst
01 natural sciences
0104 chemical sciences
law.invention
chemistry.chemical_compound
chemistry
Chemical engineering
law
Water splitting
0210 nano-technology
Bifunctional
Subjects
Details
- ISSN :
- 00134686
- Volume :
- 337
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........48686f67236a8a9a12455dce4af76aed