Tuning Proton Exchange and Transport in Protic Ionic Liquid Solution through Anion Chemistry.

The Journal of Physical Chemistry Letters
Gongyue HuangHaijin Zhu

Abstract

Herein, we demonstrate that the potential difference of proton reduction and hydrogen gas oxidation of protic ionic liquids is closely related to the proton exchange rate in the electrolyte. Through a careful design of anion chemistry, the proton exchange rate can be boosted by several orders of magnitude, reaching 200 kHz at 100 °C. It is found that the enhanced proton exchange rate can effectively decrease the potential loss at the electrode, most likely through alleviating the H+ concentration gradient incurred by electrochemical reactions at the electrode surfaces. This research therefore highlights the strategy of using anions of medium-strength acids, such as H2PO4-, for protic ionic liquids with enhanced proton exchange capability.

References

May 15, 2003·Chemical Communications : Chem Comm·Md A B H SusanMasayoshi Watanabe
Dec 11, 2003·Journal of the American Chemical Society·Masahiro YoshizawaC Austen Angell
Apr 10, 2007·The Journal of Physical Chemistry. B·Jean-Philippe Belieres, C Austen Angell
Dec 22, 2007·Chemical Reviews·Tamar L Greaves, Calum J Drummond
Jun 29, 2010·Journal of the American Chemical Society·Seung-Yul LeeMasayoshi Watanabe
Feb 22, 2012·Chemical Reviews·Hongwei Zhang, Pei Kang Shen
Oct 2, 2015·Chemical Reviews·Tamar L Greaves, Calum J Drummond
Oct 19, 2017·The Journal of Physical Chemistry Letters·Haijin ZhuMaria Forsyth

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