Monolithic Au Nanoscale Films with Tunable Nanoporosity Prepared via Dynamic Soft Templating for Electrocatalytic Oxidation of Methanol
Monolithic Au Nanoscale Films with Tunable Nanoporosity Prepared via Dynamic Soft Templating for Electrocatalytic Oxidation of Methanol
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DOI：
10.1021/acsanm.0c01316
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
Shunsuke Shiba;S. Hirabayashi;O. Niwa;Dai Kato;M. Kunitake;M. Matsuguchi
中科院分区：
文献类型：
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作者：
Shunsuke Shiba;S. Hirabayashi;O. Niwa;Dai Kato;M. Kunitake;M. Matsuguchi
本文报道了以双连续微乳液为动态软模板，采用电沉积Au的方法，自底向上合成具有整体形貌的纳米多孔金（Au）薄膜。Au电沉积仅发生在BME的水相，其具有由表面活性剂和助表面活性剂分隔的水相和油相组成的交织的三维网络。在电沉积和动态变化的BME微结构的相互进步，导致在垂直于电极表面生长的单片Au纳米结构。通过调节初始BME组成和电沉积动力学参数，如沉积电位和时间，可以广泛地和可重复地控制所得的膜纳米结构。所得的单片纳米多孔Au膜表现出甲醇氧化反应（莫尔）和氧还原反应（ORR）的过电位的显著降低，这不仅可以提供大的电化学活性表面积，而且还可以提供丰富的台阶/扭结位点或优选暴露的小平面。
We report the bottom-up synthesis of nanoporous gold (Au) thin films with monolithic morphology based on Au electrodeposition from a bicontinuous microemulsion (BME) as a dynamic soft template. Au electrodeposition occurs only at the aqueous phase of the BME, which has intertwined three-dimensional networks composed of aqueous and oil phases compartmentalized by surfactant and cosurfactant. Mutual progress in electrodeposition and dynamic change in the BME microstructure resulted in a monolithic Au nanostructure grown vertically to the electrode surface. The resultant film nanostructure can be widely and repeatably controlled by adjusting the initial BME composition and electrodeposition kinetic parameters, such as deposition potential and time. The resultant monolithic nanoporous Au film exhibited a significant decrease in the overpotentials of both methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) derived from its nanostructure, which could provide not only a large electrochemically active surface area but also abundant step/kink sites or preferably exposed facets.