Exploring the Influence of the Nickel Oxide Species on the Kinetics of Hydrogen Electrode Reactions in Alkaline Media

Influence of the NaOH Concentration on the Hydrogen Electrode Reaction Kinetics of Ni and NiCu Electrodes

“…Nevertheless, this behavior significantly differs from the trends observed on noble metals, such as Pt (111), for which the onset potential of the HER current as well 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 as the inverse of the charge transfer resistance of the H ad formation decrease with pH between pH 11 and 13. [25] In agreement with the previous publications, HOR/HER kinetics is significantly improved when the Ni electrode surface is partially covered with Ni (hydr)oxide species [35] and/or when Ni is alloyed with Cu. [40,41] The CV curves obtained on partially oxidized Ni disk and on NiCu/C electrodes at pH 12, 13 and 14 are displayed in Figure 2a,b and 3, respectively.…”

“…In agreement with the previous publications, HOR/HER kinetics is significantly improved when the Ni electrode surface is partially covered with Ni (hydr)oxide species and/or when Ni is alloyed with Cu . The CV curves obtained on partially oxidized Ni disk and on NiCu/C electrodes at pH 12, 13 and 14 are displayed in Figure a,b and 3, respectively.…”

“…. [35] Briefly, the anodic peak observed around 0.25 V versus RHE in Ar-saturated solution (dashed curves in Figures 1 a,b) is attributed to the oxidation of strongly adsorbed H ad (step 3) followed by the adsorption of OH (step 4), and then formation of a surface layer of α-Ni(OH) 2 (step 6):…”

“…[28] In this work, we present a kinetic study of the HOR/HER on Ni electrodes in the pH range from 12 to 14. Since the HOR/HER activity of Ni is rather low [29][30][31] due to the strong hydrogen binding to the surface, [32][33][34] it is usually enhanced either by partially oxidizing Ni surfaces [21,[35][36][37][38] or by combining Ni with other non-noble transition metals such as Mo, Cr, Co or Cu. [34,[39][40][41][42][43][44] Hence, to have a better understanding of the pH dependence, along with metallic Ni, in this work we also explore a partially oxidized Ni as well as a NiCu/C electrode.…”

Ni(OH)2-Ni/C for hydrogen oxidation reaction in alkaline media

“…For example, h-BN shell confined Ni nanoparticles (NPs) and Ni-NCNT were reported to be good HOR catalysts [29,30] . Decoration of oxygen containing species were also reported to improve the HOR catalytic activity of Ni by electronic effect [7,31] , but the systematic study of the decoration strategy is still leaking.…”