Enhanced electrocatalytic activity of FeNi alloy quantum dot-decorated cobalt carbonate hydroxide nanosword arrays for effective overall water splitting
The development of earth-abundant catalysts toward high-efficiency overall water splitting is of critical importance for electrochemical hydrogen production. Here, novel FeNi alloy quantum dot (QD)-decorated cobalt carbonate hydroxide (CoCH) nanosword arrays were successfully constructed on Ni foam...
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Published in | Nanoscale Vol. 14; no. 8; pp. 3191 - 3199 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
Royal Society of Chemistry
24.02.2022
|
Subjects | |
Online Access | Get full text |
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Summary: | The development of earth-abundant catalysts toward high-efficiency overall water splitting is of critical importance for electrochemical hydrogen production. Here, novel FeNi alloy quantum dot (QD)-decorated cobalt carbonate hydroxide (CoCH) nanosword arrays were successfully constructed on Ni foam (FeNi/CoCH/Ni foam) and used as an efficient bifunctional electrocatalyst for overall water splitting in alkaline media. Benefiting from the synergistic effect between the FeNi alloy QDs and CoCH, the FeNi/CoCH/Ni foam electrode delivers a current density of 20 mA cm
−2
at an overpotential of 240 mV and a small Tafel slope of 44.8 mV dec
−1
for the oxygen evolution reaction (OER). Further, it displays excellent performance for overall water splitting with a voltage of 1.49 V at 10 mA cm
−2
and maintains its activity for at least 23 h. In particular, it only needs low cell voltages of 1.54 and 1.6 V to drive high current densities of 100 and 400 mA cm
−2
, respectively, which is much better than commercial Pt/C/Ni foam|RuO
2
/Ni foam, providing great potential for large-scale application.
A novel FeNi/CoCH/Ni foam nanosword array is successfully constructed as an efficient bifunctional electrocatalyst for overall water splitting in alkaline media. |
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Bibliography: | 10.1039/d1nr08035k Electronic supplementary information (ESI) available. See DOI ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/d1nr08035k |