Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 10, Pages 4346-4353Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta10584c
Keywords
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Funding
- National Natural Science Foundation of China [21675127]
- Fundamental Research Funds for the Northwest A&F University of China [2014YB093, 2452015257]
- Development Project of Qinghai Key Laboratory [2017-ZJ-Y10]
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In this study, we report that bimetallic iron-nickel sulfide nanowall arrays supported on nickel foam (Fe-11.1%-Ni3S2/Ni foam) via wet-chemistry conversion from its LDH precursor could perform the function of a high-performance and versatile catalyst toward both overall water and urea electrolysis in a base. Its efficiency for overall water splitting is superior to those of most newly reported transition metal-based bifunctional catalysts, with small cell voltage of 1.60 V needed to gain 10 mA cm(-2). Moreover, this electrode also performs well toward the UOR, requiring very small potentials of 0.284 and 0.372 V (vs. SCE) to achieve 10 and 100 mA cm(-2) in 1.0 M KOH with 0.33 M urea. After replacing the anodic OER with the UOR that has a much lower thermodynamic voltage, this urea-mediated water-electrolysis device could sustain an overall current density of 10 mA cm(-2) at a low voltage of only 1.46 V (140 mV less than that for its urea-free counterpart) for over 20 h. Also, battery-and solar energy-assisted overall water and urea electrolysis devices were built to explore the viability of future less-energy-intensive and large-scale hydrogen generation.
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