Enhanced degradation of organic pollutants by MnCo2O4.5/formic acid process: Active species and mechanism

Zhu, Fang; Xiao, Qixing; Ji, Lingli; Yu, Miao; Komarneni, Sridhar; Ma, Jianfeng

doi:10.1016/j.matlet.2022.132661

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“…The Mn 2p spectrum of Ir–MnCo 2 O 4.5 reveals peaks at 641.8 and 653.5 eV, corresponding to Mn 2p 3/2 and Mn 2p 1/2 , respectively (Figure S7b). The fitting peaks at 641.69 and 653.24 eV can be assigned to Mn 3+ , while the peaks at 643.60 and 654.85 eV represent Mn 4+ . , According to the peak areas of the Co 2p and Mn 2p spectra of MnCo 2 O 4.5 as shown in Table S4, the average oxidation states of Co and Mn are calculated to be +2.5 and +3.5, respectively. In comparison to the +2 and +3 oxidation states of Mn in MnCo 2 O 4 , , the higher oxygen content in MnCo 2 O 4.5 may be attributed to the prolonged high-temperature (at 300 °C for 12 h) oxidation of Mn in ambient air (Table S5).…”

Section: Resultsmentioning

confidence: 99%

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Hua,

Li,

Rui

et al. 2024

ACS Catal.

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Industrial water electrolysis requires oxygen evolution reaction (OER) catalysts that exhibit both high activity and adaptability to high current densities. However, single Ir atoms of the OER catalysts often show high performance in the three-electrode system but are limited to low current densities in proton exchange membrane water electrolyzers (PEMWE). The high oxidation potential and catalyst shedding caused by oxygen bubble desorption have hindered the stability, resulting in unsatisfactory PEMWE performance. Achieving high catalytic stability under high current density conditions still presents a significant challenge for all of the OER catalysts. In this study, an efficient and stable catalytic system for OER is constructed by a doping strategy, which consists of atomically dispersed Ir sites in MnCo 2 O 4.5 . The integrated Ir−MnCo 2 O 4.5 catalyst demonstrates remarkable OER activity, with a low overpotential of 238 mV at 10 mA/cm 2 . It exhibits long-term stability, maintaining this high activity for 700 h at 20 mA/cm 2 with a degradation rate of 0.025 mV/h. Impressively, the PEMWE with the integrated Ir− MnCo 2 O 4.5 as the anode remains stable even after nearly 100 h at 200 mA/cm 2 , outperforming most previously reported singleiridium atom-based PEMWEs. Density functional theory calculations show that the redistribution of charges brought by the introduction of Ir and Mn not only effectively reduces the dissolution of lattice oxygen and Ir active sites but also lowers the energy barrier of the rate-determining step, thereby significantly improving the stability and activity of Ir−MnCo 2 O 4.5 under high current density.

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Section: Resultsmentioning

confidence: 99%

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Hua,

Li,

Rui

et al. 2024

ACS Catal.

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Enhanced degradation of organic pollutants by MnCo2O4.5/formic acid process: Active species and mechanism

Cited by 1 publication

References 12 publications

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

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Enhanced degradation of organic pollutants by MnCo2O4.5/formic acid process: Active species and mechanism

Cited by 1 publication

References 12 publications

Integrating Atomically Dispersed Ir Sites in MnCo2O4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Integrating Atomically Dispersed Ir Sites in MnCo2O4.5 for Highly Stable Acidic Oxygen Evolution Reaction

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Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction