Designing and Tuning the Electronic Structure of Nickel–Vanadium Layered Double Hydroxides for Highly Efficient Oxygen Evolution Electrocatalysis

Abstract

Despite the considerable efforts in advancing nonprecious-metal candidates as oxygen evolution reaction (OER) electrocatalysts, cost-effective production of efficient and stable catalysts via simple synthesis routes remains to be realized. We report on the experimental and density functional theory (DFT) guidelines of nickel (Ni)−vanadium (V) layered double hydroxides (LDHs) to prepare an optimal electrocatalyst by changing its composition ratio. The optimized Ni 0.75 V 0.25 LDH exhibits the ultralow overpotentials of 200 and 292 mV at the current densities of 10 and 400 mA cm −2 , respectively, a long-term durability of more than 100 h at 10 mA cm −2 , and an extremely low Tafel slope of 48.3 mV dec −1 . These findings can provide guidance for the facile optimal design of state-of-the-art water oxidation catalysts by using LDHs for large-scale practical applications. The enhanced catalytic performance can be attributed to a lower hydrogen desorption energy and the presence of many open O sites, which can promote the initiation of the OER reaction.

rGO functionalized (Ni,Fe)-OH for an efficient trifunctional catalyst in low-cost hydrogen generation via urea decomposition as a proxy anodic reaction

“…This indicates the presence of a relatively higher amount of (Ni,Fe)-OOH on the electrode surface after the stability testing. This is associated with the compactness of catalyst particles after the stability test, 51 as shown in the SEM images (Fig. S11a and b†).…”

Chemical etching induced microporous nickel backbones decorated with metallic Fe@hydroxide nanocatalysts: an efficient and sustainable OER anode toward industrial alkaline water-splitting

“…S13†), which clearly showed a pair of peaks corresponding to the M–OOH phase (M = Ni, Fe). 54,55 In addition, the area under the Fe 0 peak decreased while that of the O 1s peaks increased, supporting the likely oxidation of M–OH into M–OOH. The XRD analysis, however, did not reveal peaks from the M–OOH phase.…”

Bimetallic Cu/Fe MOF-Based Nanosheet Film via Binder-Free Drop-Casting Route: A Highly Efficient Urea-Electrolysis Catalyst

“…In addition, the combustion of hydrogen releases only water as a by-product, and is, therefore, eco-friendly [ 1 , 2 , 3 , 4 ]. Among the several hydrogen production techniques, the electrochemical water-splitting process is the emission-free green route for generating hydrogen with high purity [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Unfortunately, the efficiency of hydrogen production is severely hindered due to the sluggish oxygen evolution reaction process (OER) at the anode [ 15 , 16 , 17 , 18 ].…”