Co(OH)2 Nanosheets Supported on Laser Ablated Cu Foam: An Efficient Oxygen Evolution Reaction Electrocatalyst

Abstract

Highly efficient and low-cost non-noble metal based electrocatalysts for oxygen evolution reaction (OER) have attracted more and more attention in recent years. However, the current research has been focused on the construction of novel OER electrocatalysts themselves, little attention has been paid to the modification of the substrates. In this work, a different strategy is proposed via laser ablation to fabricate the Cu foams with rich micro/nano-structures as OER substrates. Later, the precipitation conversion method was utilized to grow cobalt hydroxide on the laser fabricated Cu foams. The as-produced Cu/Cu oxides/Co(OH) 2 electrocatalysts exhibit high OER activity in 1 M KOH, requiring an overpotential of only 259 mV at a current density of 50 mA cm −2 with excellent mild-term durability. The improved catalytic performance of the prepared samples can be attributed to the increased surface area, rich active sites, and the superhydrophilicity of the laser produced micro/nano-structures.

Electrodeposition of High-Surface-Area IrO2 Films on Ti Felt as an Efficient Catalyst for the Oxygen Evolution Reaction

“…As a promising hydrogen production strategy, water electrolysis has emerged as a sustainable and eco-friendly technology (Brillet et al, 2012;Park et al, 2019b). Despite these benefits, one key reason it has not been utilized in practical applications is the slow associated rate of the oxygen evolution reaction (OER) (Zhou et al, 2020). The OER involves four electron-proton coupled reactions, and requires the use of a relatively higher amount of energy (higher overpotential) compared to the hydrogen evolution reaction (HER), which is a typical two electron-transfer reaction (Suen et al, 2017;Jang et al, 2020).…”

Perovskite With Tunable Active-Sites Oxidation State by High-Valence W for Enhanced Oxygen Evolution Reaction

“…Taking into account the prone to surface remodeling during the OER reaction ( Diaz-Morales et al, 2016 ), cyclic voltammetry (CV) testing was carried out to obtain a more realistic catalytic surface ( Supplementary Figure S2 ). After CV for 100 cycles, the Co 0 peak disappeared and the content of Co 2+ reached up to 66% ( Zhou et al, 2019 ), which was originated from the formation of cobalt oxyhydroxide (CoOOH) as active sites for enhanced OER ( Figure 3C ) ( Da et al, 2019 ). At the lower potential, the active sites (Co) with lower valence state are more conducive to being pre-oxidated and the reconstruction of the intermediate Co-OOH structure are carried out ( Xiao et al, 2020 ).…”

Self-supported Cu3P nanowire electrode as an efficient electrocatalyst for the oxygen evolution reaction

“…Cu foam has a large surface area, porous structure, and excellent stability and conductivity under alkaline conditions, which is benecial to promote the OER reaction. 28,29 The Cu 3 P nanowires on Cu foam (Cu 3 P NWs/CF) was synthesized by a simple two-step method, as shown in Fig. The morphology of Cu(OH) 2 NWs/CF and Cu 3 P NWs/CF were observed by scanning electron microscopy (SEM).…”