NiMo Nanoparticles Electrodeposited by Pulsed Current and Their Catalytic Properties for Hydrogen Production

作者：Lucatero Savidra; Tamayo Gabriel; Crespo Diego; Marino Ernesto; Videa Marcelo^*

来源：Journal of New Materials for Electrochemical Systems, 2013, 16(3): 177-182.

• hydrogen
• evolution
• nanoparticles
• electrodeposition
• NiMo alloy

The electrocatalytic activity of NiMo nanoparticles (NPs) fabricated by means of current pulses from a binary electrolyte was characterized using cyclic voltammetry. The pulse current density, j(pulse), was varied in the range of 7 to 430 mA/cm(2), whereas the pulse time, t(pulse), was kept constant at two seconds. Mean NP size, D-mean, ranged within 27 and 38 nm at j(pulse) values between 15 and 140 mA/cm2; with D-mean. increasing as jpulse was higher. NP dispersion (i. e., number of objects per unit area of substrate) was lower when j(pulse), values were also low (15 and 35 mA/cm2), which showed consistency with a promoted nuclei formation and prolonged NP growth at higher values. An improved catalytic performance for hydrogen evolution was determined upon increasing pulse in the range of 7 to 70 mA/cm2 and remaining practically unvaried at higher j(pulse) values. The electrosynthesis of two distinct catalytic materials was indicated by electro-chemical characterization of deposits; the material with greatest catalytic activity also showed high instability, causing a dramatic decay (similar to 80%) in the activity after two consecutive cycles of operation. Ni and Mo content in electrodeposits were both sensitive to variations in jpulse.

• 出版日期2013-7