期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 23, 页码 5552-5557出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c01461
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资金
- Australian Research Council (ARC) [FL110100013]
- European Union [797295]
- Marie Curie Actions (MSCA) [797295] Funding Source: Marie Curie Actions (MSCA)
By carefully designing the anion chemistry of protic ionic liquids, the proton exchange rate can be significantly increased, leading to reduced potential loss at the electrode and more efficient energy conversion.
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 degrees 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.
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