超亲水性
塔菲尔方程
电解质
分解水
电极
电解
离解(化学)
电解水
材料科学
多孔性
氢
润湿
电化学
化学工程
化学
纳米技术
催化作用
光催化
物理化学
复合材料
工程类
有机化学
作者
Aiqun Kong,Peng Mao,Hongzhi Gu,Shuchun Zhao,Ye Lv,Menghui Liu,Yawei Sun,Shengdong Dai,Yan Fu,Jinli Zhang,Wei Li
标识
DOI:10.1016/j.cej.2021.131234
摘要
Synergetic control of active sites, electrolyte wetting and gas releasing is of vital importance for efficient electrocatalysts in water-splitting. Herein, a Ru/MXene 3D electrode, featuring both superaerophobicity and superhydrophilicity, is first synthesized on porous Ni foam with the aid of Ti3C2Tx nanosheets. The Ru/c-Ti3C2Tx/NF achieves the current densities of 10, 100, 500, 1000 mA/cm2 at overpotentials of 37, 113, 219 and 320 mV respectively, with the Tafel slope of 60 mV/dec for hydrogen evolution reaction in alkaline media. It remains stable at 100 mA/cm2 during continuous electrolysis of 12 h. The Ru/c-Ti3C2Tx/NF demonstrates excellent overall water splitting performance, affording a low voltage of 1.53 V at 10 mA/cm2. In combination with DFT calculation, it illustrates that the enhanced HER performance of Ru/c-Ti3C2Tx/NF attributes to the synergetic modulation of Ru and Ti3C2Tx in the process of H2O dissociation and subsequent H2 formation, as well as superior wettability and rapid gas departure.
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