Three-Dimensional Dendritic Cu–Co–P Electrode by One-Step Electrodeposition on a Hydrogen Bubble Template for Hydrogen Evolution Reaction

Abstract

A Cu–Co–P electrocatalyst for hydrogen evolution reaction (HER) was designed with a dendritic and porous foam structure. Fabricated by one-step electrodeposition with binary alloy on a hydrogen bubble template, the porous foam exhibited remarkable HER activity in alkaline conditions. Cu was the dominant element in the core and shell region and acted for 3D structure formation. Cu–Co formed in the shell part and acted as an active region for hydrogen evolution reaction. Also, as the amount of P increased in the Cu–Co–P foams, the pore numbers, the electrochemical surface area (ECSA), and the HER activity were enhanced. The improved activity is believed to originate from the charge separation between the negatively charged P (δ–) and positively charged Cu and Co (δ+), the larger ECSA, and increased porosity.

Direct electrodeposition of Ni‐Co‐S on carbon paper as an efficient cathode for anion exchange membrane water electrolysers

“…Moreover, the thickness of the nanoflakes decreased on changing the deposition potential from −2.0 to −2.2 V Hg/HgO . (insets of Figure 1C and D), owing to the vigorous HER during the electrodeposition process, where more electrons were consumed for the reduction of the H + rather than that of the Ni 2+ , Co 2+ , and CH 4 N 2 S; this behaviour has been occasionally reported in the previous literature 51 . The bulk compositions of the Ni‐Co‐S electrodeposits were measured by EDS (Figure S4); the results are summarized in Table S1.…”

“…(insets of Figure 1C and D), owing to the vigorous HER during the electrodeposition process, where more electrons were consumed for the reduction of the H + rather than that of the Ni 2+ , Co 2+ , and CH 4 N 2 S; this behaviour has been occasionally reported in the previous literature. 51 The bulk compositions of the Ni-Co-S electrodeposits were measured by EDS ( Figure S4); the results are summarized in Table S1. For the metallic composition, the Ni/Co ratios were similar in the range of 0.40 to 0.42, regardless of the deposition potential, conceivably originated from mass-transfer controlled electrodeposition.…”

Electrodeposition of (hydro)oxides for an oxygen evolution electrode

“…Most of these materials can be electrodeposited using template methods. Anodic aluminum oxide (AAO), [91][92][93] ZnO nanorods, 48,94 hydrogen/oxygen bubbles, [95][96][97] and polystyrene 69,98 have been widely used as templates. Electrodeposition ensures the uniform production of high-density 3D materials since it allows complete inlling of the space between the template spheres from the bottom to the top layers.…”

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

“…This method can also result in the damage of the substrate owing to ion collision. In contrast, with the electrodeposition method, it is possible to coat a substrate with a uniform composition metal film to obtain a smooth surface (Maliar et al, 2019;Park et al, 2019a). Additionally, the electrodeposition method also enables low-cost deposition via direct growth, and it is associated with efficient catalyst utilization (Kim et al, 2004;Fouda-Onana et al, 2014).…”