Details

Autor(en) / Beteiligte

• Zhu, Wenxin
• Yue, Zhihao
• Zhang, Wentao
• Hu, Na
• Luo, Zhengtao
• Ren, Meirong
• Xu, Zhijie
• Wei, Ziyi
• Suo, Yourui
• Wang, Jianlong

Titel

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

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2018-01, Vol.6 (10), p.4346-4353

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In this study, we report that bimetallic iron–nickel sulfide nanowall arrays supported on nickel foam (Fe 11.1% –Ni 3 S 2 /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.