Abstract
Mixed transition metal nickel oxide materials (M-NiO; M = Co, Mn, Fe) supported on silicone nanofilaments (SNFs) were synthesized via precipitation reaction with urea. All materials were evaluated for their OER activity in 0.1 M KOH, of which the Fe-NiO/SNFs showed a notable improvement over NiO/SNFs and unsupported NiO. The results presented herein demonstrate the extension of our previously reported synthesis for NiO/SNFs to yield SNF-supported mixed transition metal-oxide materials. The versatility and scalability of the synthesis are particularly interesting for the facile preparation of three-dimensional, binderless electrodes for alkaline water electrolysis applications.
Highlights
This page was generated automatically upon download from the ETH Zurich Research Collection
Physical characterization.—The thickness of the entangled, uncoated silicone nanofilament (SNF) layer grown on fluorine doped tin oxide (FTO) glass substrate was measured prior to the deposition of M-Ni(OH)[2] (M = Co, Mn, Fe) using scanning electron microscopy (SEM, not shown) and ranged from 5 μm to 8 μm
Individual filaments were approximately 20 nm–120 nm in diameter with a mean of 60 ± 20 nm. These observations are consistent with our previous reports on SNFs, and Scanning electron microscopy (SEM) images representative of the uncoated network can be found in Reference 27
Summary
This page was generated automatically upon download from the ETH Zurich Research Collection. The urgency for efficient large-scale energy storage and conversion systems continues to rise as the implementation of intermittent renewable energy sources, such as wind and solar energy harvesting plants, continues to become more prevalent. To meet this demand, the electrolytic splitting of water is expected to play a key role due to its ability to produce clean, carbon emission-free hydrogen fuel at high pressure.[1,2,3] Typically, the choice of highly active and stable electrocatalysts for use in acid-based polymer electrolyte water electrolysis (PEWE) is restricted to the noble metal oxides (i.e. IrO2/RuO2), the scarcity and high cost of which will largely impede widespread commercialization.
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