Self-supported anodic film of Fe(III) redox center doped Ni-Co Prussian blue analogue frameworks with enhanced catalytic activity towards overall water electrolysis

This work reports on in-situ doping of Fe(III) redox centers to NiCo based Prussian blue analogue framework films and their eletrocatalytic performance towards water splitting into molecular hydrogen and oxygen. Uniform and self-supported films of frameworks are deposited onto nickel substrate via a...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-12, Vol.878, p.114594, Article 114594
Main Authors: Yoon, Seog Joon, Bui, Hoa Thi, Lee, Soo Jeong, Patil, Supriya A., Bathula, Chinna, Shrestha, Nabeen K., Im, Hyunsik
Format: Article
Language:English
Subjects:
Aqueous electrolytes
Bulk density
Catalytic activity
Cobalt
Doped films
Doping
Electrocatalyst
Electrolysis
Electrolytes
Iron
Nickel
Overall water splitting
Oxygen evolution reactions
Pigments
Prussian blue analogue
Redox center doping
Substrates
Water splitting
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Summary:This work reports on in-situ doping of Fe(III) redox centers to NiCo based Prussian blue analogue framework films and their eletrocatalytic performance towards water splitting into molecular hydrogen and oxygen. Uniform and self-supported films of frameworks are deposited onto nickel substrate via anodization in 80 vol % glycerol based aqueous electrolyte containing 0.1 M K3[Co(CN)6] with/without addition of a small amount of [Fe(CN)6]3− as doping precursor. XRD, HR-TEM, STEM and XPS characterization of the film confirmed the doping. Notably, the doped film demonstrated an enhanced electrocatalytic activity towards hydrogen and oxygen evolution reaction in alkaline electrolyte with small overpotentials of 169 and 263 mV, respectively to derive the benchmark current density of 10 mAcm−2. In addition, bulk electrolysis at 10 mAcm−2 demonstrated an improved and well-maintained long-term electrochemical durability of the doped film-based cathode and anode for overall splitting of water. [Display omitted] •PBA film is obtained by anodization of Ni-substrate in [Co(CN)6]3+ electrolyte.•Fe(III) center doped film is achieved by adding trace [Fe(CN)6]3+ to electrolyte.•After doping, PBA film shows enhanced electrocatalysis on water splitting.•In addition, an improved electrochemical durability of the doped film is achieved.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2020.114594