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Wet-chemistry topotactic synthesis of bimetallic iron–nickel sulfide nanoarrays: an advanced and versatile catalyst for energy efficient overall water and urea electrolysis

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Abstract

In this study, we report that bimetallic iron–nickel sulfide nanowall arrays supported on nickel foam (Fe11.1%–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.

Graphical abstract: Wet-chemistry topotactic synthesis of bimetallic iron–nickel sulfide nanoarrays: an advanced and versatile catalyst for energy efficient overall water and urea electrolysis

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Publication details

The article was received on 01 Dec 2017, accepted on 02 Feb 2018 and first published on 02 Feb 2018


Article type: Paper
DOI: 10.1039/C7TA10584C
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Wet-chemistry topotactic synthesis of bimetallic iron–nickel sulfide nanoarrays: an advanced and versatile catalyst for energy efficient overall water and urea electrolysis

    W. Zhu, Z. Yue, W. Zhang, N. Hu, Z. Luo, M. Ren, Z. Xu, Z. Wei, Y. Suo and J. Wang, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA10584C

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