电解水制氢具有可持续、高效率、无污染等优点,但该技术存在能耗过大、生产成本偏高等问题。其原因在于电解电极析氢过电位太高,造成能源消耗大,为了有效地降低能耗,研究新型析氢电极材料是解决电解水难题的关键所在。MXenes具有高比表面积、良好的亲水性、较低的析氢过电位和氢吸附吉布斯自由能,是一种理想的析氢阴极材料。系统地从MXene材料的制备、储存及其表面官能团结构改性等方面开展了探讨,结合析氢理论研究和实验研究,对MXene二维材料的电解析氢性能和析氢反应机理进行了阐述。最后,对MXene在析氢催化领域的发展前景作出展望,随着制备方法的多样化和技术手段的改进,MXene定会作为未来主要的析氢催化材料之一。
Water electrolysis is sustainable,high efficiency and pollution-free technology.However,the shortcomings of the technology are also significantly,such as high energy consumption and high production cost.The reason is that the hydrogen evolution overpotential of the current electrolysis electrode is too high,resulting in large energy consumption.In order to effectively reduce energy consumption,further investigation and development of novel hydrogen evolution electrode materials is critical.MXenes is two-dimensional nanomaterial with the high specific surface area,good hydrophilic property,low hydrogen evolution overpotential and hydrogen adsorption gibbs free energy,which is ideal candidate cathode material for hydrogen evolution.The preparation,storage,structure modification by surface functional group of MXene were systematically discussed.Combined with theoretical and experimental studies on hydrogen evolution,electrolysis hydrogen properties of MXene and the mechanism of hydrogen evolution reaction were described.Finally,the development prospect of MXene in the hydrogen evolution catalysis was illustrated.With the diversification of preparation methods and the improvement of technology,MXene will definitely be one of the main catalytic materials for hydrogen evolution in the future.
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基金资助
国家自然科学基金(51704221);武汉轻工大学杰出青年基金项目(2018J05)