Electrochemical Characterization of Rapidly-Densified Ni-Mo Electrodes

Electrochemical performance of hydrogen evolution reaction of Ni–Mo electrodes obtained by mechanical alloying

“…2b and d), revealing the milling condition e ect on the electrochemical process, as it was reported before [2,3]. Theoretically, the smaller Bc the better electrode for catalyzing HER [1][2][3]7,8]. From Table 1 it is observed that the alloys prepared with no additions of PCA present the lower Bc values under the study conditions.…”

“…The absolute value of these negative data is an indirect indication of how extraordinary active these electrodes behave at 343 K in such testing environment. Comparable testing values (vs:Ag + =AgCl) have been reported before [1][2][3]7,8].…”

“…It has been reported before that the electro-catalytic active phase is attributed to the presence of over saturated and nanocrystalline FCC solid solution of Mo into Ni [1], however the basic reasons for having such good properties are, in fact, still unknown. By the other hand, it has also been reported that potentiodynamic polarization analysis conÿrmed that microstructural factors such as metastability, galvanic couples and particle size distribution on these electrodes are required for e ective hydrogen gas production [2,3,7,8]. In spite of this, there are no reports concerning electrochemical studies carried-out in structures close to thermodynamic equilibrium.…”

“…In a number of the above mentioned papers [1][2][3]7,8] two Tafel slopes (Bc and Ba) are reported. The Bc values reported in the present work are close to those high Bc reported before for several authors.…”

“…Sturm [5] and Mund et al [6] found that its catalytic activity was enhanced by additions of transition metals such as titanium, iron and molybdenum. In a previous work, Sebastian et al [7,8], conducted the Ni-Mo electrochemical evaluation on rapidly densiÿed Ni-Mo electrodes by the spark plasma sintering process (SPS-treated powders).…”