Nickel selenide as a high-efficiency catalyst for oxygen evolution reaction

Abstract

Ni3Se2 has been identified as a high-efficiency oxygen evolution catalyst with low onset potential and extended stability under alkaline conditions.

Cobalt Selenide Nanostructures: An Efficient Bifunctional Catalyst with High Current Density at Low Coverage

“…Such decrease of Faradaic efficiency with increasing voltage has been observed previously, 55 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 58 59 60 20 these the tubular geometry is even more lucrative since that architecture offers even more surface area for catalytic activities. Hence we have grown the Co7Se8 as ordered arrays of rods and tubes following a protocol developed by Nath et al, [49][50] which involves confined electrodeposition in lithographically patterned nanoelectrodes on conducting substrates (see supporting information).…”

“…The onset potential as well as overpotential @ 10 mA cm -2 for Co7Se8 on GC are significantly better than the cobalt selenide phases reported previously and is comparable to some of the nickel selenide based electrocatalysts recently produced from our group. 55 It should be noted that these values are amongst the best for OER electrocatalysts in alkaline medium and outperform most of the conventional oxides as well as the high performing transition metal oxide and hydroxides.…”

“…This procedure has been published previously 55 and is described in details in the supporting information. The basic theme of this experiment is combining the ORR and OER processes such that the gas evolved at the anode (OER) is carried over to the Pt ring electrode and if the gas is indeed O2, the Pt electrode (maintained at 0.2 V) should be able to reduce it (ORR) thereby producing the reduction current.…”

“…Hence to understand the kinetic parameters, Tafel slopes of these catalysts were retrieved from the LSVs following standard procedures, 55 and are presented in Figure 5b (details have been provided in supporting information). It was observed that η vs log(j) plot was linear for all deposition times, with almost similar slopes (Table 1) indicating that the reaction mechanism follows a similar pathway.…”

“…53,54 In this study, 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 58 59 60 12 based catalysts in alkali solution. [53][54][55] CDL was calculated from of slope of line in the plot of capacitive current (iDL) versus scan rates, ν (V / s).…”