Ni(OH)2NiOOH 2D-nanosheets tailored with FeOOH nanorods: A synergy of morphological engineering towards bifunctional overall water splitting
Oxygen evolution reaction (OER) is the bottleneck for effective overall water splitting owing to its sluggish reaction kinetics. Metal oxyhydroxides are a significant class of electrocatalysts that demonstrate remarkable activity and stability toward the oxygen evolution reaction. A facile one-pot h...
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Published in | International journal of hydrogen energy Vol. 54; pp. 1552 - 1562 |
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Main Authors | , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
07.02.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Oxygen evolution reaction (OER) is the bottleneck for effective overall water splitting owing to its sluggish reaction kinetics. Metal oxyhydroxides are a significant class of electrocatalysts that demonstrate remarkable activity and stability toward the oxygen evolution reaction. A facile one-pot hydrothermal synthesis is demonstrated in this study to obtain the heterostructured NiFe-oxyhydroxide electrocatalyst. FeOOH nanorods are decked over the 2D Ni(OH)2NiOOH nanosheets to form the Ni(OH)2NiOOH/FeOOH heterostructure. The prepared Ni(OH)2NiOOH/FeOOH electrocatalyst demands a minimal OER overpotential of 209 mV to reach a current density of 10 mA cm−2, which is relatively smaller than the commercial RuO2. Moreover, the NiFe-oxyhydroxide also exhibits remarkable activity towards hydrogen evolution reaction by demanding a minimal overpotential of 118 mV that is relatively lower than the commercial Pt/C to obtain a current density of 10 mA cm−2. With the implication of prepared Ni(OH)2NiOOH/FeOOH both as anode and cathode, the fabricated electrolyzer demonstrates a minimal cell voltage of 1.52 V to attain a current density of 10 mA cm−2 and displays an extended stability for a period of 50 h.
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•A facile one-pot hydrothermal procedure for the synthesis of Ni(OH)2NiOOH/FeOOH heterostructure.•FeOOH nanorods decked over 2D Ni(OH)2NiOOH nanosheets display synergism toward electrocatalytic activity.•Bifunctional OER mechanism of Ni(OH)2NiOOH/FeOOH heterostructure boosts oxygen evolution reaction kinetics.•Ni(OH)2NiOOH/FeOOH-based water electrolyzer requires a minimal cell voltage of 1.52 V. |
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ISSN: | 0360-3199 1879-3487 |
DOI: | 10.1016/j.ijhydene.2023.11.307 |