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Excavated RhNi alloy nanobranches enable superior CO-tolerance and CO2 selectivity at low potentials toward ethanol electro-oxidation

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Abstract

Electrocatalysts during ethanol oxidation still suffer from poor CO2 selectivity and are easily poisoned by CO intermediates at low overpotentials, causing great challenges for commercial viability of direct ethanol fuel cells. Herein, we report the synthesis of excavated RhNi alloy nanobranches constructed from ultrathin nanosheets with high-energy {110} facets and a large specific surface area (50.0 m2 gāˆ’1). These unique RhNi nanobranches achieve a CO2 selectivity of as high as 16.0% toward the EOR in alkaline solution, far exceeding the reported value of most Pd, Pt or Rh-based electrocatalysts in alkaline solution to date. More strikingly, the excavated RhNi nanobranches show outstanding CO-poisoning tolerance ability, resulting in a high CO2 selectivity at low potentials. Both CO stripping and in situ FTIR spectra of the EOR and CO oxidation analyses reveal that the alloying of Ni into Rh endows the nanobranches with high CO anti-poisoning ability, and thus great CO2 selectivity at low potentials.

Graphical abstract: Excavated RhNi alloy nanobranches enable superior CO-tolerance and CO2 selectivity at low potentials toward ethanol electro-oxidation

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Publication details

The article was received on 18 Sep 2019, accepted on 05 Nov 2019 and first published on 06 Nov 2019


Article type: Communication
DOI: 10.1039/C9TA10327A
J. Mater. Chem. A, 2019, Advance Article

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    Excavated RhNi alloy nanobranches enable superior CO-tolerance and CO2 selectivity at low potentials toward ethanol electro-oxidation

    H. Li, J. Ye, X. Li, J. Zhang, Y. Zhu, Z. Zhou, Y. Xue, Y. Jiang, Z. Xie and L. Zheng, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA10327A

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