Synergistic effect of tunable oxygen-vacancy defects and graphene on accelerating the photothermal degradation of methanol over Co3O4/rGO nanocomposites

Zeng, Yikui; Zhong, Jinping; Wang, Huangbin; Fu, Mingli; Ye, Daiqi; Hu, Yun

doi:10.1016/j.cej.2021.131658

Cited by 55 publications

(20 citation statements)

References 68 publications

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“…The Raman spectrum of HRS sample exhibits five distinct characteristic peaks at 195, 479, 520, 616, and 688 cm −1 , corresponding to the F 2g (1) , E g , F 2g (2) , F 2g (3) , and A 1g modes of Co 3 O 4 (Fig. 4 e) [ 52 , 53 ]. Compared with HRS samples, the A 1g peak of LRS sample shows a negative shift of 5 cm −1 , which can be ascribed to the more OVs in LRS sample.…”

Section: Resultsmentioning

confidence: 99%

Electric-Field-Treated Ni/Co3O4 Film as High-Performance Bifunctional Electrocatalysts for Efficient Overall Water Splitting

Ren

et al. 2022

Nano-Micro Lett.

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Highlights A novel physical approach is proposed to enhance the electrocatalytic performance by electric field. Under the action of electric field, some stable conductive filaments consisting of oxygen vacancies are formed in the Ni/Co 3 O 4 film, which remarkably reduces the system resistivity. The electric-field-treated Ni/Co 3 O 4 material exhibits significantly superior activity and stability as a bifunctional electrocatalyst for overall water splitting, and its performance exceeds the state-of-the-art electrocatalysts. Abstract Rational design of bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with excellent activity and stability is of great significance, since overall water splitting is a promising technology for sustainable conversion of clean energy. However, most electrocatalysts do not simultaneously possess optimal HER/OER activities and their electrical conductivities are intrinsically low, which limit the development of overall water splitting. In this paper, a strategy of electric field treatment is proposed and applied to Ni/Co 3 O 4 film to develop a novel bifunctional electrocatalyst. After treated by electric field, the conductive channels consisting of oxygen vacancies are formed in the Co 3 O 4 film, which remarkably reduces the resistance of the system by almost 2 × 10 4 times. Meanwhile, the surface Ni metal electrode is partially oxidized to nickel oxide, which enhances the catalytic activity. The electric-field-treated Ni/Co 3 O 4 material exhibits super outstanding performance of HER, OER, and overall water splitting, and the catalytic activity is significantly superior to the state-of-the-art noble metal catalysts (Pt/C, RuO 2 , and RuO 2 ǁ Pt/C couple). This work provides an effective and feasible method for the development of novel and efficient bifunctional electrocatalyst, which is also promising for wide use in the field of catalysis. Supplementary Information The online version contains supplementary material available at 10.1007/s40820-022-00889-3.

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Section: Resultsmentioning

confidence: 99%

Electric-Field-Treated Ni/Co3O4 Film as High-Performance Bifunctional Electrocatalysts for Efficient Overall Water Splitting

Ren

et al. 2022

Nano-Micro Lett.

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“…89,[276][277][278][279][280] The former step is the rate-limiting one, which indicates the vital importance of activating lattice oxygen. 281,282 The combination of temperature-programmed reduction (TPR, with H 2 or CO) and temperature-programmed desorption (TPD, with O 2 ) techniques in dark and under illumination can demonstrate the effect of light on lattice oxygen of catalysts. 131,283,284 As shown in Fig.…”

Section: Modifying Active Sitesmentioning

confidence: 99%

Thermo-photo catalysis: a whole greater than the sum of its parts

Fang

2022

Chem. Soc. Rev.

127

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“…The peaks of methoxy (2820, 1100, 1050 cm À 1 ) and formaldehyde (2940 cm À 1 ) appeared after 20 min of reaction, and gradually accumulated with the increase of time. The peaks at 2890 and 1640 cm À 1 corresponded to monodentate formate and bidentate formate species respectively, while bicarbonate and carbonate species appeared at 1420 and 1190 cm À 1 respectively, [21] indicating that the lattice oxygen participated in the process of oxidizing methanol molecules and produced intermediates such as formaldehyde, formate and carbonate. Compared with CH 3 OH/ Air atmosphere (Figure 10a), more methoxy and formaldehyde species accumulated on the surface of the catalyst, and new methoxy species (2600 cm À 1 ) were accumulated after 60 min of reaction, [51] meaning that the activity of lattice oxygen was limited.…”

Section: Study On Reaction Path and Mechanismmentioning

confidence: 99%

Alkali Etching Induced CoAl‐Layered Double Oxides with Regulatable Cation and Oxygen Vacancy Defects to Promote the Photothermal Degradation of Methanol

et al. 2022

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By controlling the alkali etching time, the cation and oxygen vacancies contents of CoAl‐LDHs were adjusted. Then CoAl‐layered double oxides catalysts (CoAl‐LDOs‐x) were prepared by calcination and applied to the photothermal catalytic degradation of methanol and acetone under the full spectrum simulated solar illumination. Compared with CoAl‐LDOs‐0 without alkali etching, CoAl‐LDOs‐9 with alkali etching for 9 h showed the most superior photothermal catalytic activity and excellent stability. A series of studies had suggested that the most superior activity of the catalyst could be ascribed to the cation vacancy produced by alkali etching, resulting in more Co3+ active sites on the surface. At the same time, alkali etching also produced oxygen vacancy, which accelerated the adsorption and conversion of surface reactive oxygen species (ROS). In addition, the activation effect of light on lattice oxygen and gas phase oxygen was proved by in‐situ DRIFTS, and the degradation path of methanol was clarified.

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Synergistic effect of tunable oxygen-vacancy defects and graphene on accelerating the photothermal degradation of methanol over Co3O4/rGO nanocomposites

Cited by 55 publications

References 68 publications

Electric-Field-Treated Ni/Co3O4 Film as High-Performance Bifunctional Electrocatalysts for Efficient Overall Water Splitting

Electric-Field-Treated Ni/Co3O4 Film as High-Performance Bifunctional Electrocatalysts for Efficient Overall Water Splitting

Thermo-photo catalysis: a whole greater than the sum of its parts

Alkali Etching Induced CoAl‐Layered Double Oxides with Regulatable Cation and Oxygen Vacancy Defects to Promote the Photothermal Degradation of Methanol

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