Phosphorene Quantum Dots as Electrocatalysts for Oxygen Evolution

  • Author: Liam Critchley
  • Published: 17 November 2018
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: ACS Nano/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Phosphorene Quantum Dots as Electrocatalysts for Oxygen Evolution

Phosphorene (pictured) is a semiconducting 2D material, composed of black-phosphorus-like single layers. Quantum dots are very small particles of semiconductor materials. Phosphorene quantum dots show electrocatalytic activity for oxygen evolution reactions (OERs), a type of reaction that splits water to form molecular oxygen.


Manikoth M. Shaijumon, Indian Institute of Science Education and Research Thiruvananthapuram, and colleagues have synthesized phosphorene quantum dots, using a two-electrode electrochemical exfoliation process with black phosphorus crystals as the precursor material. A 3 V potential was applied to a black phosphorus crystal anode in an electrolyte solution consisting of LiClO4 in formamide against a platinum counter electrode. The resulting quantum dots were surface-functionalized with nitrogen-containing groups during the process.


The quantum dots were characterized and their electrochemical properties were determined using, among other methods, linear sweep voltammetry, cyclic voltammetry, electrochemical impedance spectroscopy (EIS), UV-vis and near-infrared (NIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and atomic force microscopy (AFM).


The functionalized phosphorene quantum dots have a high efficiency and stability for OER reactions, with an overpotential of 1.66 V at 10 mA cm–2, a low Tafel slope of 48 mV dec–1, a low electrical resistance of 295 Ω and stability for over 10 hours. The results show promise for phosphorene quantum dots as an anode material in alkaline water splitting applications.


 

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