Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 253, Issue -, Pages 131-139Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2019.04.054
Keywords
Layered double hydroxide; Architectures; Oxygen evolution reaction; Hydrogen; Evolution reaction; Synergistic effect
Funding
- National Nature Science Foundation of China [21606111, 21878130]
- Natural Science Foundation of Jiangsu Province [BK20150482]
- China Postdoctoral Science Foundation [2018M642181, 2017T110453]
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Developing active, stable and cost-effective bifunctional electrocatalysts with earth-abundant metals (Ni, Fe, Co) is a prerequisite to achieve overall water splitting. In this work, a novel CoFe-layered double hydroxide (LDH) coupled with NiFe-LDH nanosheet array supported on nickel foam (denoted as CoFe@NiFe/NF) is developed through a facile hydrothermal and electrodeposition method. Remarkably, benefiting from strong synergistic effect between CoFe-LDH and NiFe-LDH and the unique structural features, the resulting CoFe@NiFe/NF architectures catalyst exhibits excellent activities and stabilities for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Furthermore, an efficient and stable alkali-electrolyzer using CoFe@NiFe/NF as both the cathode and anode achieve a voltage of 1.59 V at the current density of 10 mA cm(-2), which is superior to many other state-of-the-art earth-abundant electrocatalysts. This work provides a facile method for enhancing the electrocatalytic activity by constructing hierarchical core-shell architectures using the LDH nanosheet materials.
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