Increasing cerium dispersion favours lattice oxygen activity of cobalt oxides for CO catalytic combustion

Qin, Chunlan; Xu, Kangwei; Shi, Ying; Ruan, Shanshan; He, Chenliang; Zhang, Lidong

doi:10.1016/j.combustflame.2023.113219

Cited by 4 publications

(1 citation statement)

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“…25 ). Given that the binding energy of Co 2+ is higher than that of Co 3+ , the shift in the binding energy peak to the lower energy corroborates the higher valence state 24 , 25 . It is also evident that the characteristic satellite peak of Co 2+ almost disappears, further proving that Co 2+ is almost completely oxidized to the higher valence state during the OER process.…”

Section: Resultsmentioning

confidence: 64%

Highly efficient anion exchange membrane water electrolyzers via chromium-doped amorphous electrocatalysts

Li,

Liu,

Zhang

et al. 2024

Nat Commun

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In-depth comprehension and modulation of the electronic structure of the active metal sites is crucial to enhance their intrinsic activity of electrocatalytic oxygen evolution reaction (OER) toward anion exchange membrane water electrolyzers (AEMWEs). Here, we elaborate a series of amorphous metal oxide catalysts (FeCrOx, CoCrOx and NiCrOx) with high performance AEMWEs by high-valent chromium dopant. We discover that the positive effect of the transition from low to high valence of the Co site on the adsorption energy of the intermediate and the lower oxidation barrier is the key factor for its increased activity by synchrotron radiation in-situ techniques. Particularly, the CoCrOx anode catalyst achieves the high current density of 1.5 A cm−2 at 2.1 V and maintains for over 120 h with attenuation less than 4.9 mV h−1 in AEMWE testing. Such exceptional performance demonstrates a promising prospect for industrial application and providing general guidelines for the design of high-efficiency AEMWEs systems.

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Section: Resultsmentioning

confidence: 64%