Intrinsically robust cubic MnCoO_x solid solution: achieving high activity for sustainable acidic water oxidation

Abstract

This article reveals the promising potential of MnCoOx solid solutions as an effective catalyst for the oxygen evolution reaction (OER). The solid oxide solution was synthesized by utilizing redox deposition...

Configuration Effect of Plasmonic Vanadium–Titanium Solid Solutions for Photo-oxidation of Benzyl Alcohol

“…The Ti 2p 3/2 XPS spectrum can be simplified into two peaks at 459.0 and 457.9 eV, which are attributed to Ti 4+ and Ti 3+ species. , The Ti 3d spectra indicated that the percentage of surface Ti 3+ in the VTiO x composites ranged from 12.2 to 23.0%, with the predominant titanium state being Ti 4+ . The O 1s XPS peaks were deconvoluted into three peaks, corresponding to lattice oxygen, oxygen trapped by vacancies (O v ), and hydroxyl groups, respectively. − The O v number in the prepared VTiO x composite was determined to be much higher than that in pristine TiO 2 , with V 0.07 Ti 0.93 O x exhibiting the highest O v content of ∼24.4%. The XPS results demonstrate that the introduction of V leads to a partial reduction of Ti 4+ to Ti 3+ and the generation of additional oxygen vacancy sites, thereby enhancing the photocatalytic activity.…”

Constructing Adjustable Heterointerface for Enhancing Acidic Oxygen Evolution Performances of RuO2@CoMnO3 Nanosheets Electrocatalysts

“…In terms of the elemental valence state of CMR-x, the high-resolution X-ray photoelectron spectroscopy (XPS) spectra and fitted peaks are depicted in Figures g–i and S1. As for the high-resolution spectrum of Co 2p (Figure g), the Co 2+ (∼781.9 and ∼797.0 eV) and Co 3+ (∼779.8 and ∼795.0 eV) can be deconvoluted. , Moreover, the average values for surface oxidation state (SOS) of Co 2p for CMR-1, CMR-2, and CMR-3 are calculated based on the peak area, corresponding to ∼2.64, ∼2.56, and ∼2.66, respectively. In regard to the high-resolution spectrum of Mn 2p (Figure h), which can be divided into three kinds of peaks assigned to Mn 2+ (∼641.2 and ∼652.8 eV), Mn 3+ (∼642.2 and ∼655.2 eV), and Mn 4+ (∼644.8 and ∼656.6 eV), the average SOS values of Mn 2p for CMR-1, CMR-2, and CMR-3 are ∼2.49, ∼2.50, and ∼2.45, respectively.…”

“…As for the high-resolution spectrum of Co 2p (Figure g), the Co 2+ (∼781.9 and ∼797.0 eV) and Co 3+ (∼779.8 and ∼795.0 eV) can be deconvoluted. , Moreover, the average values for surface oxidation state (SOS) of Co 2p for CMR-1, CMR-2, and CMR-3 are calculated based on the peak area, corresponding to ∼2.64, ∼2.56, and ∼2.66, respectively. In regard to the high-resolution spectrum of Mn 2p (Figure h), which can be divided into three kinds of peaks assigned to Mn 2+ (∼641.2 and ∼652.8 eV), Mn 3+ (∼642.2 and ∼655.2 eV), and Mn 4+ (∼644.8 and ∼656.6 eV), the average SOS values of Mn 2p for CMR-1, CMR-2, and CMR-3 are ∼2.49, ∼2.50, and ∼2.45, respectively. Additionally, the difference in average SOS value between Co and Mn is 0.06 for CMR-2, which is smaller than those of CMR-1 (0.15) and CMR-3 (0.21), which is probably caused by the interfacial binding force between RuO 2 and CoMnO 3 .…”

Optimizing the active interface structure of MnO2 to achieve sustainable water oxidation in an acidic medium

“…For instance, doping elements (Ni, Co, Ru, etc. ), 19–21 developing novel structures (Co 2 MnO 4 , Mn 7.5 O 10 Br 3, etc. ), 14,22,23 regulating the phase (amorphous-MnO 2 , α-MnO 2 , γ-MnO 2 , etc. )…”