Mn-incorporated Co3O4 bifunctional electrocatalysts for zinc-air battery application: An experimental and DFT study

Huang, Changfei; Zhang, Yishuai; Li, Xiaowen; Cao, Haijie; Guo, Youmin; Zhang, Chuanhui

doi:10.1016/j.apcatb.2022.121909

Cited by 65 publications

(34 citation statements)

References 77 publications

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“…S13b, ESI†), which proves the successful doping of Mn elements in Co 3 O 4 . 34,35 In addition, the EDX elemental mapping (Fig. 2(g)) also reveals the formation of CeO 2 and Co 3 O 4 heterostructures and uniform distribution of C, N, O, and Mn elements in Mn–CeO 2 @Co 3 O 4 .…”

Section: Resultsmentioning

confidence: 89%

“…Comparing with CoCe-Oxides, there is a significant negative shift of Co3O4 (311) in Mn-CeO2@Co3O4 (Figure S13b), which proves the successful doping of Mn element in Co3O4. 34,35 In addition, the EDX elemental mapping (Figure 2g) also reveal the formation of CeO2 and Co3O4 heterostructure and uniform distribution of C, N, O, Mn elements in Mn-CeO2@Co3O4. When other factors are adjusted to synthesize the comparison material, the spherical morphology of CoCeMn-Oxides-x (x = 6-10) are largely preserved though most of nanospheres showed unsatisfactory core-shell morphology (Figure S4-S6).…”

Section: Resultsmentioning

confidence: 91%

“…S13b, ESI †), which proves the successful doping of Mn elements in Co 3 O 4 . 34,35 In addition, the EDX elemental mapping (Fig. 2 However, the spherical morphology of Co-oxides, CoMn-oxides and CoCe-oxides was severely fragmented after calcination (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Manganese and selenium co-doped CeO₂@Co₃O₄ porous core–shell nanospheres for enhanced oxygen evolution reactions

et al. 2023

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 91%

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Manganese and selenium co-doped CeO₂@Co₃O₄ porous core–shell nanospheres for enhanced oxygen evolution reactions

et al. 2023

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“…O 2 -TPD profiles of the samples with oxygen treatment (Figure B) show the codesorption of surface adsorbed oxygen and active surface oxygen at 149 °C on MnO 2 , at 121 °C on reduced Pt-in-MnO 2 , and at 98 °C on reduced Pt-on-MnO 2 . In the literature, the surface adsorbed oxygen is O – , O 2 – , or O 2 2– , which have higher oxidative ability than an active surface lattice oxygen . The lowest desorption temperature of surface adsorbed oxygen on Pt-on-MnO 2 strongly suggests its highest mobility of surface adsorbed oxygen, which may be the most active to oxidize HCHO compared to those on Pt-in-MnO 2 and MnO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…In the literature, the surface adsorbed oxygen is O − , O 2 − , or O 2 2− , which have higher oxidative ability than an active surface lattice oxygen. 33 The lowest desorption temperature of surface adsorbed oxygen on Pt-on-MnO 2 strongly suggests its highest mobility of surface adsorbed oxygen, which may be the most active to oxidize HCHO compared to those on Pt-in-MnO 2 and MnO 2 . The subsurface lattice oxygens are desorbed at 349 and 327 °C on Pt-in-MnO 2 and Pt-on-MnO 2 , respectively, which are lower than 369 °C on MnO 2 .…”

Section: Chemical and Physicalmentioning

confidence: 97%

Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

et al. 2023

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Formaldehyde (HCHO) is a hazardous pollutant in indoor space for humans because of its carcinogenicity. Removing the pollutant by MnO2-based catalysts is of great interest because of their high oxidation performance at room temperature. In this work, we regulate the Pt–MnO2 (MnO2 = manganese oxide) interaction and interface by embedding Pt in MnO2 (Pt-in-MnO2) and by dispersing Pt on MnO2 (Pt-on-MnO2) for HCHO oxidation over Pt–MnO2 catalysts with trace Pt loading of 0.01 wt %. In comparison to the Pt-in-MnO2 catalyst, the Pt-on-MnO2 catalyst has a higher Brunauer–Emmett–Teller surface area, a more active lattice oxygen, more oxygen vacancy activating more dioxygen molecules, more exposed Pt atoms, and noninternal diffusion of mass transfer, which contribute to the higher HCHO oxidation performance. The HCHO oxidation performance is stable over the Pt–MnO2 catalysts under high space velocity and high moisture humidity conditions, showing great potential for practical applications. This work demonstrates a more effective Pt-dispersed MnO2 catalyst than Pt-embedded MnO2 catalyst for HCHO oxidation, providing universally important guidance for metal–support interaction and interface regulation for oxidation reactions.

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Enhanced Oxygen Redox Kinetics and Stability in Li−O₂ Batteries Using Trimetallic MnCo_2‐xCu_xO₄ Spinel Catalysts

Kannan,

Guddehalli Chandrappa,

Kumar Gupta

et al. 2024

Batteries & Supercaps

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High energy density rechargeable Li‐O2 batteries (LOBs) have garnered significant attention as a promising energy storage device. However, the sluggish oxygen redox kinetics impeded the efficiency and cycling performance during both the charge and discharge processes. To address this issue, we introduce a non‐noble‐trimetallic MnCo2‐xCuxO4 (X= 0 to 1) spinel interface as a bifunctional catalyst, to improve the reaction kinetics and cycle stability of LOBs. The half‐filled eg orbital improves the synergistic interaction between Cu+/Cu2+, Co2+/Co3+, and Mn3+/Mn4+ redox pairs in the lattice, which enhances catalytic performance. In the series of MnCo2‐xCuxO4 (X=0 to 1) spinel catalyst MnCo1.75Cu0.25O4 (MCU25) emerged as a standout performer. This exhibited notable half‐cell performance, featuring superior ORR/OER bifunctional electrocatalytic activity with a ΔE of 1.15 V (vs RHE). Notably, the MCU25 cathode exhibited remarkable stability for over 1250 hours, enduring 225 cycles at 500 mA h g‐1 and stable up to 70 cycles at a capacity limit of 1000 mA h g‐1 in LOBs. Furthermore, it demonstrated an exceptional discharge‐specific capacity of 11272 mA h g‐1 at a current density of 175 mA g‐1, exceeding the performance achieved by state‐of‐the‐art RuO2 around 10180 mA h g‐1.

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Mn-incorporated Co3O4 bifunctional electrocatalysts for zinc-air battery application: An experimental and DFT study

Cited by 65 publications

References 77 publications

Manganese and selenium co-doped CeO₂@Co₃O₄ porous core–shell nanospheres for enhanced oxygen evolution reactions

Manganese and selenium co-doped CeO₂@Co₃O₄ porous core–shell nanospheres for enhanced oxygen evolution reactions

Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

Enhanced Oxygen Redox Kinetics and Stability in Li−O₂ Batteries Using Trimetallic MnCo_2‐xCu_xO₄ Spinel Catalysts

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Mn-incorporated Co3O4 bifunctional electrocatalysts for zinc-air battery application: An experimental and DFT study

Cited by 65 publications

References 77 publications

Manganese and selenium co-doped CeO2@Co3O4 porous core–shell nanospheres for enhanced oxygen evolution reactions

Manganese and selenium co-doped CeO2@Co3O4 porous core–shell nanospheres for enhanced oxygen evolution reactions

Regulating the Pt–MnO2 Interaction and Interface for Room Temperature Formaldehyde Oxidation

Enhanced Oxygen Redox Kinetics and Stability in Li−O2 Batteries Using Trimetallic MnCo2‐xCuxO₄ Spinel Catalysts

Contact Info

Product

Resources

About

Manganese and selenium co-doped CeO₂@Co₃O₄ porous core–shell nanospheres for enhanced oxygen evolution reactions

Manganese and selenium co-doped CeO₂@Co₃O₄ porous core–shell nanospheres for enhanced oxygen evolution reactions

Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

Enhanced Oxygen Redox Kinetics and Stability in Li−O₂ Batteries Using Trimetallic MnCo_2‐xCu_xO₄ Spinel Catalysts