论文标题
通过质子可渗透的石墨烯电极解离的界面水解离效应
Wien effect in interfacial water dissociation through proton-permeable graphene electrodes
论文作者
论文摘要
强电场可以加速分子解离反应。先前使用高压电解细胞观察到这种现象称为WIEN效应，该电解细胞产生了约10^7 V M-1的场，足以加速弱结合的分子（例如有机物和弱电解质）的分离。对常见的水解离病（H2O = H + + OH-）的WIEN效应的观察仍然难以捉摸。在这里，我们研究了与质子可渗透石墨烯电极相邻的界面水的解离，并观察到达到10^8 V M-1以上的田间反应的强加速度。石墨烯电极的使用允许测量仅由界面水解离产生的质子电流，而驱动反应的电场通过同一田间在石墨烯中诱导的载体密度进行监测。观察到的质子电流的指数增加与Onsager的理论一致。我们的结果还表明，石墨烯电极对于研究涉及质子转运的各种界面现象可能是有价值的。
Strong electric fields can accelerate molecular dissociation reactions. The phenomenon known as the Wien effect was previously observed using high-voltage electrolysis cells that produced fields of about 10^7 V m-1, sufficient to accelerate the dissociation of weakly bound molecules (e.g., organics and weak electrolytes). The observation of the Wien effect for the common case of water dissociation (H2O = H+ + OH-) has remained elusive. Here we study the dissociation of interfacial water adjacent to proton-permeable graphene electrodes and observe strong acceleration of the reaction in fields reaching above 10^8 V m-1. The use of graphene electrodes allow measuring the proton currents arising exclusively from the dissociation of interfacial water, while the electric field driving the reaction is monitored through the carrier density induced in graphene by the same field. The observed exponential increase in proton currents is in quantitative agreement with Onsager's theory. Our results also demonstrate that graphene electrodes can be valuable for the investigation of various interfacial phenomena involving proton transport.
