School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University , Tianjin 300072, China.
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China.
ACS Appl Mater Interfaces. 2017 Aug 16;9(32):26840-26847. doi: 10.1021/acsami.7b06727. Epub 2017 Aug 4.
Electrically splitting water to H and O is a preferred method for energy storage as long as no CO is emitted during the supplied electrical input. Here we report a laser-induced graphene (LIG) process to fabricate efficient catalytic electrodes on opposing faces of a plastic sheet, for the generation of both H and O. The high porosity and electrical conductivity of LIG facilitates the efficient contact and charge transfer with the requisite electrolyte. The LIG-based electrodes exhibit high performance for hydrogen evolution reaction and oxygen evolution reaction with excellent long-term stability. The overpotential reaches 100 mA/cm for HER, and OER is as low as 214 and 380 mV with relatively low Tafel slopes of 54 and 49 mV/dec, respectively. By serial connecting of the electrodes with a power source in an O-ring setup, H and O are simultaneously generated on either side of the plastic sheet at a current density of 10 mA/cm at 1.66 V and can thereby be selectively captured. The demonstration provides a promising route to simple, efficient, and complete water splitting.
只要在供电过程中不排放 CO，用电将水分解为 H 和 O 是一种首选的储能方法。在这里，我们报告了一种激光诱导石墨烯 (LIG) 工艺，用于在塑料片的相对面上制造高效的催化电极，以同时生成 H 和 O。LIG 的高孔隙率和导电性有利于与所需电解质的有效接触和电荷转移。基于 LIG 的电极在氢析出反应和氧析出反应中表现出优异的长期稳定性和高性能，HER 的过电势达到 100 mA/cm，OER 的过电势分别低至 214 和 380 mV，相应的 Tafel 斜率分别为 54 和 49 mV/dec。通过在 O 型环装置中将电极与电源串联，在 1.66 V 时可以在电流密度为 10 mA/cm 的情况下在塑料片的每一侧同时产生 H 和 O，并可以选择性地捕获它们。该演示提供了一种简单、高效和完整的水分解的有前途的途径。
