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Self‐Assembled Two‐Dimensional NiO/CeO 2 Heterostructure Rich in Oxygen Vacancies as Efficient Bifunctional Electrocatalyst for Alkaline Hydrogen Evolution and Oxygen Evolution
Author(s) -
Zhang Yan,
Ye Fei,
Li WeiDong Z.
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004271
Subject(s) - bifunctional , electrocatalyst , overpotential , oxygen evolution , tafel equation , non blocking i/o , water splitting , materials science , chemical engineering , inorganic chemistry , chemistry , catalysis , electrochemistry , electrode , photocatalysis , organic chemistry , engineering
The development of high‐efficiency bifunctional electrocatalysts toward the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline surroundings is essential and challenging for the large‐scale generation of clean hydrogen. Herein, a novel self‐assembled two‐dimensional (2 D) NiO/CeO 2 heterostructure (HS) consisting of NiO and CeO 2 nanocrystals is prepared through a facile two‐step approach, and utilized as an enhanced bifunctional electrocatalyst for the HER and OER under alkaline conditions. It is concluded that this 2 D NiO/CeO 2 HS, rich in oxygen vacancies, demonstrates attractive electrocatalytic properties for both the HER and OER in 1 m KOH, including low onset overpotential ( η 1 ), η 10 and Tafel slope, excellent durability, as well as large active surface area. Therefore, the self‐assembled 2 D NiO/CeO 2 HS is believed to be an efficient bifunctional electrocatalyst toward the HER and OER.