Nickel–Cobalt Selenide Electrocatalytic Electrode toward Glucose Oxidation Coupling with Alkaline Hydrogen Production

Abstract

Electrochemical glucose oxidation reaction (GOR) is a promising alternative anodic reaction to water oxidation reaction for various electrochemical oxidation reactions owing to the relatively low thermodynamic potential of GOR and the abundant source of glucose from biomass-based platform molecules. However, it remains difficult to develop high-activity and low-cost electrocatalysts toward GOR. Herein, we report a NiCoSe x nanoplate supported on Ni foam with excellent activity for GOR electrocatalysis, which achieves a high current density of 500 mA cm −2 at 1.41 V vs reversible hydrogen electrode (RHE) and a 70.2% Faraday efficiency of formate at 1.40 V vs RHE. The surface component evolution of NiCoSe x is studied by an in situ Raman spectrum, which points out the catalytic active species to be CoO x /CoOOH and NiOOH. Furthermore, we develop a two-electrode cell by pairing GOR with hydrogen evolution reaction using the NiCoSe x electrode as the bifunctional catalyst for the anode and the cathode, which only requires an applied voltage of 1.50 V to reach a high current density of 200 mA cm −2 and retains long-term stability over 18 h with a high Faraday efficiency of H 2 (close to 100%) in the cathode.

Deciphering the Influence of Morphology and Crystal Structure on Alkaline Hydrogen Evolution Activity in Polymorphic Cobalt Diselenide

“…Notably, the intensity of the O peak increases significantly after cycling due to surface hydroxylation. Deconvolution of the high-resolution Co 2p spectra of o-CoSe 2 /CC (Figure c) and c-CoSe 2 /CC (Figure d) reveals that the intensity of peaks corresponding to Co­(OH) 2 (780.6/796.5 eV for Co 2p 3/2 /Co 2p 1/2 ) is relatively large compared to CoSe 2 , again verifying that Co on the surface gets hydroxylated during the long-term HER stability test in accordance with the XRD results. − Furthermore, in the Se 3d spectrum of o-CoSe 2 /CC (Figure e) and c-CoSe 2 /CC (Figure f), the intensity of peaks corresponding to the CoSe 2 phase decreases while a significant increase in peak intensity corresponding to Se–O bond (within 58 to 65 eV range) could be observed. − The deconvoluted spectra of the O 1s (Figure S9c,d) for both o-CoSe 2 /CC and c-CoSe 2 /CC samples after the long-term stability test also confirm an appreciable increase in OH species and physi/chemisorbed water on the catalyst surface. Therefore, the overall outcome of XRD and XPS analyses suggest the formation of a hydroxide layer on the surface of CoSe 2 during the stability test in an alkaline medium.…”

Water electrolysis for hydrogen production: from hybrid systems to self-powered/catalyzed devices

“…In recent years, there has been growing interest in the coupling of the HER and the GOR on non-noble metal electrocatalysts, particularly Fe, Co, Ni, and Cu-based catalysts, such as Co@CoO heterojunctions, 441 CoNi foam, 442 NiCoSe x , 443 Ru@NiB, 444 amorphous NiFe-LDH, 445 NiFeO x , 446 Co/N-codoped carbon, 447 Co/CoP cluster, 448 2D NiCo phosphate nanosheets, 449 Cu/Cu 2 O, 450 and Fe 2 P/SSM. 451 Yu et al fabricated NiV LDH by electrochemical and N 2 /H 2 plasma regulations for boosting the activity of the GOR and HER.…”

Review and Perspective of Nickel and Its Derived Catalysts for Different Electrochemical Synthesis Reactions in Alkaline Media for Hydrogen Production

“…In another study, Lin et al 234 prepared NiCoSe x nanoplatesupported Ni foam as an effective GOR electrocatalyst, which attains 500 mA/cm 2 current density at 1.41 V (RHE) and 70.2% FE for formate production at 1.40 V (RHE) (Figure 13d). Raman spectra are used to study NiCoSe x surface component evolution, revealing that the active species are CoO x /CoOOH and NiOOH.…”

“…(f) LSV plots of two-electrode system made by bifunctional NiCoSe x catalyst for GOR and HER. (g) Comparison of H 2 generation with the conventional water splitting at 1.5 V. Reproduced with permission from ref . Copyright 2023, American Chemical Society.…”