Journal
ELECTROCHIMICA ACTA
Volume 307, Issue -, Pages 275-284Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.210
Keywords
Metal-organic frameworks; Layered double hydroxide; 3D hierarchical architecture; Oxygen evolution reaction; Electrocatalysis
Categories
Funding
- National Natural Science Foundation of China [21776017, 21521005]
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Efficient and cost-effective electrocatalysts for the oxygen evolution reaction (OER) are of paramount importance for renewable energy conversion and storage. Here, we developed a facile approach for integrating two-dimensional (2D) zeolitic imidazolate framework-67 (ZIF-67) nanoarrays and CoNiAl ternary layered double hydroxide (CoNiAl-LDH) nanoplatelets onto three-dimensional (3D) nickel foam (NF) to form a 3D hierarchical ZIF-67/CoNiAl-LDH/NF electrocatalyst. Due to the unique 3D hierarchical architecture with increased electrochemical active surface area, multi-porous framework, and intimate interfacial coupling effect, the as-prepared ZIF-67/CoNiAl-LDH/NF electrocatalyst exhibits excellent electrocatalytic activity towards OER with a small overpotential of 303 mV at 10 mA cm(-2) and Tafel slope around 88 mV dec(-1), much lower than those of the reported nickel- or cobalt-based OER catalysts. Moreover, the ZIF-67/CoNiAl-LDH/NF electrocatalyst also shows excellent electrochemical durability, and the hierarchical structure is well maintained with no detectable activity decay after continuous testing at 10 mA cm(-2) for 8 h. The present work provides a general strategy for the rational design and synthesis of multi-functional 3D hierarchical catalyst, which is expected to exhibit superior performance in a wide range of catalysis, especially in water electrolysis. (C) 2019 Elsevier Ltd. All rights reserved.
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