Journal
APPLIED SURFACE SCIENCE
Volume 570, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151182
Keywords
Bifunctional electrocatalysts; Heterostructure; Cobalt-nickel nitrides; Oxygen evolution reaction; Overall water splitting
Categories
Funding
- National Key R&D Program of China [2017YFA0700104]
- National Natural Science Foundation of China [21911530255]
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry [2019-6]
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The hybrid nano-architecture of CoNiN@NiFe LDH as a bifunctional electrocatalyst for overall water splitting exhibits excellent OER activities and stability, attributed to abundant active sites and strong electronic interactions.
Hydrogen production by electrochemical overall water splitting is considered as a clean and renewable approach for greener energy. However, the efficiency of water electrolysis suffers from the sluggish kinetics and high overpotential of OER. Although NiFe LDH is regarded as a promising OER catalyst, it faces the problem of poor conductivity, resulting in the limitations of HER performance. Herein, a hybrid nano-architecture of CoNiN@NiFe LDH as a bifunctional electrocatalyst for overall water splitting is fabricated via in-situ electrochemically assembling hierarchical NiFe LDH nanosheets on the surface of CoNiN. CoNiN@NiFe LDH shows excellent activities for OER with the overpotentials of 227 and 291 mV to deliver the current densities of 10 and 100 mA cm(-2), respectively. Moreover, an alkaline electrolyzer with CoNiN@NiFe LDH as anode and cathode requires a cell voltage of 1.63 V to achieve 10 mA cm(-2). In addition, the excellent stability with 100 h towards overall water splitting outperforms most transition metal-based bifunctional electrocatalysts. The superior performance is attributed to the abundant active sites, the strong electronic interaction, and the corresponding metal (oxy) hydroxides species generated by in situ surface reconstruction and phase transformation.
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