In situ revealing the reconstruction behavior of monolayer rocksalt CoO nanosheet as water oxidation catalyst

Guo, Weiqi; Luo, Haolin; Fang, Dongxu; Jiang, Zhi; Chi, Jiasheng; Shangguan, Wenfeng

doi:10.1016/j.jechem.2022.02.049

Cited by 27 publications

(12 citation statements)

References 54 publications

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“…In Figure h, the Raman spectra of CMNC-1, CNC, and MNC between 500 and 800 cm –1 are compared. The obvious peaks at 667.2 cm –1 for CNC and 636.3 cm –1 for MNC are assigned to the A 1g vibration modes of Co 2+ and Mn 2+ in their respective octahedral oxygen coordination systems. , For CMNC-1, the broad peak at 645.4 cm –1 may result from the coexistence of Co–O and Mn–O vibrations in the sample, which well supports the presence of the Co/MnO heterointerface in CMNC-1. Moreover, Raman spectra of CMNC-1, CMNC-2, and CMNC-0.5 are also provided in Figure i.…”

Section: Resultssupporting

confidence: 56%

“…The obvious peaks at 667.2 cm −1 for CNC and 636.3 cm −1 for MNC are assigned to the A 1g vibration modes of Co 2+ and Mn 2+ in their respective octahedral oxygen coordination systems. 45,46 For CMNC-1, the broad peak at 645. Figure 4a displays the LSV curves of various samples in an oxygen-saturated electrolyte at a rotation speed of 1600 rpm, and Figure 4b exhibits their onset potential (E onset ) and halfwave potential (E 1/2 ).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Construction of a Co/MnO Mott–Schottky Heterostructure to Achieve Interfacial Synergy in the Oxygen Reduction Reaction for Aluminum–Air Batteries

Cheng

Xue

et al. 2023

ACS Appl. Mater. Interfaces

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The rational design of non-noble metal-based electrocatalysts for an efficient oxygen reduction reaction (ORR) is an important research topic to promote the advancement of aluminum−air batteries. In this work, heterostructural Co/MnO nanoparticles encapsulated in a N-doped carbon electrocatalyst were prepared via one-step pyrolysis utilizing different reduction potentials of Co and Mn ions, and the heterointerface between the two phases was confirmed. The prepared catalyst displays Pt/C competitive ORR performance because of the interfacial synergy of a Co/MnO Mott−Schottky (M−S) heterostructure, which leads to boosted conductivity, formation of an M−S barrier, and a reduced oxygen reduction energy barrier for excited electrons. Furthermore, the Co/MnO-based aluminum−air battery displays good discharge performance, demonstrating good feasibility for practical application.

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Section: Resultssupporting

confidence: 56%

Section: ■ Results and Discussionmentioning

confidence: 99%

Construction of a Co/MnO Mott–Schottky Heterostructure to Achieve Interfacial Synergy in the Oxygen Reduction Reaction for Aluminum–Air Batteries

Cheng

Xue

et al. 2023

ACS Appl. Mater. Interfaces

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“…1 and Sat. 2) at 786.5 and 803.1 eV indicate abundant Co 2+ , demonstrating the existence of CoO [ 32 ]. Moreover, Co 3 O 4 is also presented in the CoO x according to distinguishable Sat.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Cobalt Oxide (CoOx) Nanowires with Different Aspect Ratios for High Performance Hybrid Supercapacitors

Zhuo

et al. 2023

Nanomaterials

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Cobalt oxide (CoOx) nanowires have been broadly explored as advanced pseudocapacitive materials owing to their impressive theoretical gravimetric capacity. However, the traditional method of compositing with conductive nanoparticles to improve their poor conductivity will unpredictably lead to a decrease in actual capacity. The amelioration of the aspect ratio of the CoOx nanowires may affect the pathway of electron conduction and ion diffusion, thereby improving the electrochemical performances. Here, CoOx nanowires with various aspect ratios were synthesized by controlling hydrothermal temperature, and the CoOx electrodes achieve a high gravimetric specific capacity (1424.8 C g−1) and rate performance (38% retention at 100 A g−1 compared to 1 A g−1). Hybrid supercapacitors (HSCs) based on activated carbon anode reach an exceptional specific energy of 61.8 Wh kg−1 and excellent cyclic performance (92.72% retention, 5000 cycles at 5 A g−1). The CoOx nanowires exhibit great promise as a favorable cathode material in the field of high-performance supercapacitors (SCs).

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“…The G band arises due to the bond stretching of sp 2 carbon pairs in both rings and chains, and this band is associated with the optical E2g phonons at the Brillouin zone center. The D band, associated with the bending mode of aromatic rings, arises due to defects in the sample; the degree of disorder was also measured using the intensity of the D band [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation Activity Using the V2O5/RGO Composite

et al. 2023

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Semiconductor-based photocatalyst materials played an important role in the degradation of organic compounds in recent years. Photocatalysis is a simple, cost-effective, and environmentally friendly process for degrading organic compounds. In this work, vanadium pentoxide (V2O5) and V2O5/RGO (reduced graphene oxide) composite were synthesized by a hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman spectroscopy, and UV-Vis spectroscopic analysis, etc. Raman analysis shows the occurrence of RGO characteristic peaks in the composite and different vibrational modes of V2O5. The band gap of flake-shaped V2O5 is reduced and its light absorption capacity is enhanced by making its composite with RGO. The photocatalytic degradation of methylene blue (MB) was studied using both V2O5 and V2O5/RGO composite photocatalyst materials. The V2O5/RGO composite exhibits a superior photocatalytic performance to V2O5. Both catalyst and light play an important role in the degradation process.

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In situ revealing the reconstruction behavior of monolayer rocksalt CoO nanosheet as water oxidation catalyst

Cited by 27 publications

References 54 publications

Construction of a Co/MnO Mott–Schottky Heterostructure to Achieve Interfacial Synergy in the Oxygen Reduction Reaction for Aluminum–Air Batteries

Construction of a Co/MnO Mott–Schottky Heterostructure to Achieve Interfacial Synergy in the Oxygen Reduction Reaction for Aluminum–Air Batteries

Mesoporous Cobalt Oxide (CoOx) Nanowires with Different Aspect Ratios for High Performance Hybrid Supercapacitors

Enhanced Photocatalytic Degradation Activity Using the V2O5/RGO Composite

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