4.7 Article

Ultrathin nanosheet metal-organic framework@NiO/Ni nanorod composites

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 417, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129201

Keywords

Metal-organic framework; NiO/Ni; Electrocatalyst; Overall urea electrolysis

Funding

  1. National Natural Science Foundation of China [NSFC-U1904215, 21671170]
  2. Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
  3. Program for Young Changjiang Scholars of the Ministry of Education, China [Q2018270]
  4. Qinglan Project of Jiangsu Province
  5. Natural Science Foundation of Jiangsu Province [BK20200044]

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A facile approach for preparing ultrathin nanosheet metal-organic frameworks@NiO/Ni nanorods was described, showing increased stability and highly active sites for urea electrolysis. These hierarchical nanocomposites exhibited excellent properties, with potential for promising electrocatalytic applications in the urea oxidation reaction.
Two-dimensional metal-organic frameworks are a family of materials with great potential for electrocatalysis; however, these materials usually have the poor thermodynamic stability and require harsh preparation conditions. Here, we describe a facile approach for preparing ultrathin nanosheet metal-organic framework@NiO/Ni nanorods with increased stability and highly active sites compared with in case of pristine metal-organic frameworks. These peculiar hierarchical nanocomposites exhibit excellent properties for urea electrolysis, including abundant exposed active sites owing to their nanosheet-nanorod hierarchical structure, enriched Ni-species, and improved stability. The prepared composites demonstrate superior electrocatalytic performance toward the urea oxidation reaction with a low overpotential of only 170 mV to reach 10 mA cm(-2), a small Tafel slope of 48.1 mV dec(-1), and a low cell voltage of 1.42 V for overall urea electrolysis, with outstanding long-term durability (15,000 s with only 7.1% activity decay). This combination between metal-organic frameworks and materials with high thermodynamic stability offers a strategy for further development of excellent electrocatalysts.

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