Structural and Electrochemical Properties of Ultra-Deep Ni3Si Microchannels

As an crucial branch for the development of micro/nanoporous metals, its exploration in ultra-deep direction has been ignored. In this paper, the electrochemical characteristics of ultra-deep micro/nanoporous metals were revealed based on Ni 3 Si microchannels for the first time. Ultra-deep Ni 3 Si microchannels were fabricated using the composite technology of directional solidification and selective phase dissolution. The large-scale morphology of the ultra-deep Ni 3 Si microchannels was characterized using field-emission scanning electron microscopy. The electrochemical characteristics of the ultra-deep Ni 3 Si microchannels were analyzed by cyclic voltammetry and electrochemical impedance spectroscopy. With the increase in microchannel depth, the specific capacitance of the Ni 3 Si microchannels increased, the charge storage capacity enhanced, and the charge transfer resistance considerably decreased from 38854 Ω·cm 2 to 404.9 Ω·cm 2 . The results suggested that ultra-deep Ni 3 Si microchannels have excellent electrochemical properties and can be used as an inexpensive and large-scale self-supporting catalyst in electrochemistry.