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NiSe2Nanoparticles supported on halloysite sheets as an efficient electrocatalyst toward alkaline oxygen evolution reaction

Taherinia, D ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.energyfuels.2c02734
  3. Publisher: American Chemical Society , 2022
  4. Abstract:
  5. The oxygen evolution reaction (OER) with its sluggish kinetics has imposed a significant barrier to the sustainable and green generation of hydrogen fuel (via electrolysis of water) and the development of metal-air batteries. In this study, we report an efficient and novel OER electrocatalyst based on NiSe2nanoparticles (NPs) and the naturally abundant halloysite clay mineral. The NiSe2/halloysite nanocomposite (NiSe2/H) was prepared by a simple one-step hydrothermal route. The electrocatalytic performance of the as-synthesized nanocomposite and its components (pristine NiSe2and halloysite) toward OER in 1.0 KOH solution was examined. The NiSe2/H nanocomposite exhibited a significantly enhanced catalytic activity in OER, with a low overpotential of 235 mV (measured at the current density of 60 mA cm-2), a Tafel slope of 146 mV dec-1, and an outstanding long-term electrochemical durability for 16 h. Moreover, this nanocomposite required only 340 mV of overpotential to deliver the high current density of 250 mA cm-2. Further investigations revealed that the improved catalytic performance of NiSe2/H can be attributed to the increased number of active sites and the optimized adsorption energy of OH-. These results indicate that NiSe2/H is a promising non-precious metal-based catalyst for alkaline OER. © 2022 American Chemical Society. All rights reserved
  6. Keywords:
  7. Catalyst activity ; Electrocatalysts ; Kaolinite ; Nanocatalysts ; Nanocomposites ; Oxygen ; Potassium hydroxide ; Reaction kinetics ; Selenium compounds ; Alkalines ; Electrocatalytic performance ; Electrolysis of waters ; Halloysite ; Halloysite clay ; Hydrothermal routes ; Metal-air battery ; Overpotential ; Simple++ ; Sluggish kinetics ; Nickel compounds
  8. Source: Energy and Fuels ; Volume 36, Issue 23 , 2022 , Pages 14331-14340 ; 08870624 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acs.energyfuels.2c02734