Journal: Chemical Science
Article Title: Nanostructured amorphous Ni–Co–Fe phosphide as a versatile electrocatalyst towards seawater splitting and aqueous zinc–air batteries †
doi: 10.1039/d5sc01249j
Figure Lengend Snippet: The Electrocatalytic ORR/OER activities of the catalysts and their performance in Zn–air batteries. (a) Polarization curves of the as-prepared catalysts based on the RRDE results in an O 2 -saturated 0.1 M KOH electrolyte at a sweep rate of 10 mV s −1 at 1600 rpm (the ring current was multiplied by 8 for a clear comparison between the samples). (b) Electron transfer number ( n ) and the H 2 O 2 selectivity (%) calculated from the RRDE studies. (c) The ORR and OER polarization curves of the NCFP catalysts as well as the control samples in 0.1 M KOH at a rotation speed of 1600 rpm. (d) Schematic illustration of a Zn–air battery based on a Zn powder anode and an NCFP2 air cathode. (e) Charge and discharge curves and the corresponding power density plots of the NCFP2 and Pt/C air cathodes of Zn‖NCFP2 and Zn‖Pt/C + RuO 2 aqueous batteries compared with a solid-state Zn foil ‖NCFP2 battery. (f) Discharge profiles of the Zn‖NCFP2 device at different discharge current densities from 10 to 75 mA cm −2 and that of the Zn‖Pt/C + RuO 2 device at a discharge rate of 10 mA cm −2 . (g) Flexibility study; monitoring the OCV of the solid-state Zn foil ‖NCFP2 battery at different bending states. (h) Practical application of the two NCFP2-based solid-state ZABs connected in series in lighting up 33 green (2.2 V) LEDs and driving a rotor (1.0 V, 30 mW). (i) Long-term cycling performances of the ZABs based on the NCFP2 and commercial 20 wt% Pt/C + RuO 2 cathodes at a charging/discharging rate of 10 mA cm −2 (each cycle lasts for 10 min).
Article Snippet: Hydrodynamic voltammetry to study the ORR using a rotating disk electrode (RDE) or rotating ring-disk electrode (RRDE) was carried out using a Princeton Applied Research Instrument model 636A Electrode Rotator (supplied by Ametek) connected to an Autolab PGSTAT30 Potentiostat/Galvanostat (Eco-Chemie, The Netherlands) and controlled via Nova 2.1.4 software.
Techniques: Comparison, Control, Battery
