Heterometallic Feed Ratio‐Dominated Oxygen Evolution Activity in Self‐Supported Metal‐Organic Framework Nanosheet Arrays Electrocatalyst

Developing earth‐abundant, highly active and long‐term durable electrocatalysts for oxygen evolution reaction (OER) is highly desirable and great challenging for large‐scale industrial application of electrochemical water splitting. Herein, in‐situ growth of uniform nanosheet arrays on nickel foam (...

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Bibliographic Details
Published in:Zeitschrift für anorganische und allgemeine Chemie (1950) 2020-09, Vol.646 (17), p.1412-1418
Main Authors: Li, Rui‐Jie, Qi, Yu‐Feng, Wang, Qian, Wang, Jia‐Jun, Liu, Zheng‐Yu, Wang, Xiu‐Guang, Zhao, Xiao‐Jun, Yang, En‐Cui
Format: Article
Language:English
Subjects:
Arrays
Electrocatalyst
Electrocatalysts
Electrocatalytic activity
Electronic structure
Industrial applications
Metal foams
Metal‐organic frameworks
Morphology
Nanosheet array
Nanosheets
Nanostructure
Oxygen evolution reaction
Oxygen evolution reactions
Reaction kinetics
Synergistic effect
Water splitting
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Summary:Developing earth‐abundant, highly active and long‐term durable electrocatalysts for oxygen evolution reaction (OER) is highly desirable and great challenging for large‐scale industrial application of electrochemical water splitting. Herein, in‐situ growth of uniform nanosheet arrays on nickel foam (NF) is hydrothermally achieved by varying feed ratios of FeIII and NiII salts. The feed ratio of the two active metals has significantly dominated both the morphological and electronic structures of the resultant electrocatalysts, leading to feed ratio‐dependent volcano‐type OER activity. The optimized Fe0.89Ni0.11‐BDC/NF exhibits the best OER performance, affording a low overpotential of 220 mV to drive a current density of 50 mA·cm–2 with small Tafel slope of 44.8 mV·dec–1 and long‐lasting stability over 20 hours. The synergistic effect from the FeIII and NiII species on both the morphological and electronic structure modulations have dramatically accelerated the reaction kinetics, responsible eventually for the enhanced OER activity. This work provides valuable information for nanostructured MOFs as efficient electrocatalysts.
ISSN:0044-2313
1521-3749
DOI:10.1002/zaac.202000121