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Elaborately tailored NiCo2O4 for highly efficient overall water splitting and urea electrolysis.
- Source :
- Green Chemistry; 10/21/2023, Vol. 25 Issue 20, p8181-8195, 15p
- Publication Year :
- 2023
-
Abstract
- For effective overall water splitting (OWS) in alkaline media, a novel Ru-doped bimetal oxide (Ru-NiCo<subscript>2</subscript>O<subscript>4</subscript>) catalyst deposited onto a conductive nickel foam (NF) is fabricated by a multi-step hydrothermal reaction, ion exchange, and subsequent annealing process. The distinctive 3D nanoneedle-like arrays not only provide an even distribution of Ru decorated NiCo<subscript>2</subscript>O<subscript>4</subscript>, but also expose additional active sites, facilitating electron transport and improving reaction kinetics. Besides, density functional theory (DFT) studies elucidate the electronic structure regulation in Ru-NiCo<subscript>2</subscript>O<subscript>4</subscript> and the modification of the d-band center optimizes H* adsorption energy, which considerably increased the hydrogen production efficiency. Considering the aforementioned advantages, the as-prepared Ru-NiCo<subscript>2</subscript>O<subscript>4</subscript> electrocatalyst exhibits greatly improved catalytic activity, requiring only 25 mV and 249 mV at 10 mA cm<superscript>−2</superscript> for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, as well as robust stability. Amazingly, the Ru-NiCo<subscript>2</subscript>O<subscript>4</subscript> electrode in a two-electrode alkaline electrolyzer only needs 1.55 V to produce 10 mA cm<superscript>−2</superscript>, making it more efficient than the commercial RuO<subscript>2</subscript>‖‖Pt/C electrode (1.62 V). More importantly, 0.33 M urea only needs a low voltage of 1.427 V to drive the urine-mediated electrolysis, which is about 123 mV less than the urea-free electrolysis cell. This work presents an effective electronic structure engineering approach based on heteroatom doping that may be extended to design and fabricate novel high-performance OWS catalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 25
- Issue :
- 20
- Database :
- Complementary Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 172981183
- Full Text :
- https://doi.org/10.1039/d3gc01828h