A Permselective CeO_x Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

Abstract

Highly active NiFeO x electrocatalysts for the oxygen evolution reaction (OER) suffer gradual deactivation with time owingtothe loss of Fe species from the active sites into solution during catalysis.T he anodic deposition of aC eO x layer prevents the loss of such Fe species from the OER catalysts, achieving ah ighly stable performance.T he CeO x layer does not affect the OER activity of the catalyst underneath but exhibits unique permselectivity,a llowing the permeation of OH À and O 2 through while preventing the diffusion of redox ions through the layer to function as as elective O 2 -evolving electrode.T he use of such ap ermselective protective layer provides an ew strategy for improving the durability of electrocatalysts.Hydrogen is an energy carrier that can effectively store intermittent energy generated by renewable energy sources, such as solar and wind power. Many techniques,such as water electrolysis and photoelectrochemical water splitting, have been studied for the generation of hydrogen and oxygen from water. Unlike the hydrogen evolution reaction (HER) conducted on the cathodic side,t he anodic oxygen evolution reaction (OER) is ak inetically sluggish reaction, requiring as ubstantial overpotential. Highly active,d urable,a nd costeffective electrocatalysts for OER are desired for the development of an efficient water splitting device.NiFeO x is one of the most active electrocatalysts for OER in alkaline conditions,and while it is known that Fe plays acritical role in the improved activity, [1] the origin of the enhancement of the OER kinetics by Fe doping is still under debate.A lthough many studies have been devoted to decreasing the overpotential via the development of an LDH structure, [2]

A Review of Transition Metal Oxygen-Evolving Catalysts Decorated by Cerium-Based Materials: Current Status and Future Prospects

“…CeBM could inhibit the oxidation and depletion of metal-active sites. 40 Figure 1 Schematic diagram of CeBM-decorated transition metal oxygen-evolving catalysts current status and future prospects Different from previous reviews focus on CeO 2 -functionalized in various electrocatalytic applications, 24,[28][29][30] the present review by us is not meant to be comprehensive, but it does offer some new insights that are more focused on electrocatalytic oxygen evolution reaction (OER). First, we focus our review and discussion on various transition metal-based OER catalysts: TMOs, TMCs, TMPs, and TMBs have been thoroughly surveyed.…”

Effect of Catalytically Silent Cerium Hydroxide in Cobalt–Cerium Mixed Double Hydroxide for Enhanced Water Oxidation Kinetics in a BiVO4 Photoanode

“…Surprisingly, BiVO 4 -Ce(OH) x retains 99% of the initial photocurrent, which confirms that the stability of BiVO 4 -CoCe(OH) x increases mainly due to the presence of cerium hydroxide. 38 results show that cerium is acting as an excellent overlayer material for enhancing the photostability of BiVO 4 . The amount of hydrogen and oxygen generated by the BiVO 4 -CoCe(OH) x photoanode during PEC water oxidation was measured by gas chromatography.…”

Facile synthesis of Co and Ce dual-doped Ni3S2 nanosheets on Ni foam for enhanced oxygen evolution reaction

“…S5 in the ESM) [42]. Moreover, Raman spectra in Co/Ce-Ni3S2/NF presented an O-Ce-O vibration and Ni-O bonds approximately at 455 and 550 cm −1 , confirming the forming of CeOx phase [43]. The peaks of Co/Ce-Ni3S2/NF were shifted toward higher wavenumber values, which again manifested the existence of electron transfer (Fig.…”