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High performance direct borohydride fuel cell using bipolar interfaces and noble metal-free Ni-based anodes

Abstract : Due to its unmatched theoretical voltage of 2.18 V, direct alkaline fuel cell using sodium borohydride solution at the anode and hydrogen peroxide at the cathode, represents a promising power source for high energy density applications. However, its development faces several challenges. Here we demonstrate a BH4-/H2O2 direct borohydride fuel cell (DBFC) with a platinum group metal (PGM)-free anode, which delivers unprecedented combination of 2.0 V open-circuit voltage and peak power density of 446 mW cm-2. This exceptionally high cell voltage is enabled by combining a pH-gradient-enabled microscale bipolar interface (PMBI), a Ni anode obtained by electrodeposition of Ni nanoparticles on an electrochemically-etched Ni felt (eNFT), and a specially-designed simple but efficient coating procedure to deposit anion-exchange ionomer on the anode surface. The PMBI efficiently separates the drastically-disparate pH of the anolyte and the catholyte, the NiED/eNFT anode provides high surface area for efficient electrocatalysis and open porosity for fast mass-transport, while the coating procedure allows preserving Ni in metallic state, the latter being prerequisite for high anode performance. This work details how such fully nickel-based anodes are obtained and demonstrates why their BOR activity and stability outperforms that of PGM-based anodes.
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https://hal.univ-grenoble-alpes.fr/hal-02953350
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Soumis le : mercredi 30 septembre 2020 - 10:06:22
Dernière modification le : lundi 12 octobre 2020 - 14:00:03

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Guillaume Braesch, Zhongyang Wang, Shrihari Sankarasubramanian, Alexandr Oshchepkov, Antoine Bonnefont, et al.. High performance direct borohydride fuel cell using bipolar interfaces and noble metal-free Ni-based anodes. Journal of Materials Chemistry A, Royal Society of Chemistry, In press, ⟨10.1039/D0TA06405J⟩. ⟨hal-02953350⟩

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