Abstract
Electrochemical characterization of the uniformly dispersed Pt and Ag nanodots synthesized after in situ scalable electron‐beam reduction on copper grid and carbon‐fiber electrode is demonstrated. By employing plasma pretreatment to produce functional organosilicon micronetworks‐based reaction sites on copper grid, the size and standard deviation of the electrochemically reduced metallic nanodots can be strictly confined. When detuning the accelerating voltage of electron‐beam from 3 to 120 kV, the reshaped nanodot diameter enlarges from 12.7 ± 0.8 to 18.3 ± 3.6 nm due to the gradual self‐aggregation. In comparison with sputtering method, the electroactivity of Pt nanodot covered carbon fiber electrode obtained after electron‐beam reduction exhibits a larger electroactive surface (Spt) of 16.56 cm2/mg. The electron‐beam reduction provides a better dispersion of the reduced Pt nanodots based catalysts on carbon‐fiber electrode, promoting the utilization efficiency of these nanoscale catalyst (defined as the ratio of electroactive to geometric area) from 2.5% to 7%.
Highlights
At the beginning of the 20th century, Louis de Broglie theorized that the electron had wave-like characteristic with a wavelength far smaller than light visible to the human eye [1]
Electroactivities and electrochemical properties of the Pt/Carbon fiber electrodes prepared between electron-beam and sputtering methods were analyzed by cyclic voltammetry (CV) through the CHI614B electrochemical analyzer
During electron-beam irradiation with SEM or scanning transmission electron microscopes (STEM), the monodispersed metallic nanodots are in situ and locally synthesized without using any reducing agents
Summary
At the beginning of the 20th century, Louis de Broglie theorized that the electron had wave-like characteristic with a wavelength far smaller than light visible to the human eye [1]. A few reports have demonstrated that metallic nanodots, through electron-beam-induced reduction, are effective for object application regarding electrodes, catalyst particles, and so forth [6], which ascribe to a strictly controlled nucleation method resulting in the prevention of dot aggregation. This was an impracticable method for use with a dispersing agent due to the in situ electron-beam. This study employed the plasma technique prior to electron-beam irradiation to create more nucleation sites in order to reach our goal Following this process, the controlled nucleation of uniformly size-distributed metallic nanodots from the metal-salt precursors under electron irradiation in SEM or STEM was evaluated. To better understand the electrode application, the effective active area of the electrode is discussed and compared to other current techniques and processes
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