Abstract
Hydrogen electrosorption was performed in thin electrodeposits of Pd alloys with Pt, Au, and Rh. The possibility of their application as phase charging–discharging systems was investigated. The values of specific pseudocapacitance, power, and energy were calculated for hydrogen-saturated Pd-rich electrodes for temperatures 283–313 K. The best working parameters are exhibited by Pd–Rh alloys with 85–95% Pd, and by Pd–Pt alloys with 90–95% Pd in the bulk. The maximum values of specific pseudocapacitance are ca. 4,500 F g−1, specific energy ca. 150 J g−1 and specific power up to 750 W g−1 (per the mass of the electroactive material). In the case of the alloy deposits on reticulated vitreous carbon, their characteristics related to the total mass of the electroactive material and the substrate are comparable with those for other supercapacitors utilizing various redox reactions.
Highlights
Pd and its alloys represent a large class of hydrogenabsorbing materials [1], which are important for chemical/ electrochemical power sources
We summarize the characteristics of Pd alloys with Pt, Au, and Rh saturated with absorbed hydrogen in the aspect of their possible application in electrochemical capacitors
Where QHabsox is charge due to the oxidation of absorbed hydrogen, ΔE is the potential range in which absorbed hydrogen is completely oxidized, and mM is mass of the hydrogen-absorbing material
Summary
Pd and its alloys represent a large class of hydrogenabsorbing materials [1], which are important for chemical/ electrochemical power sources. We show the influence of temperature and alloy bulk composition on the values of specific pseudocapacitance, power, and energy.
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