Interfacial effects in hierarchically porous α-MnO2/Mn3O4 heterostructures promote photocatalytic oxidation activity

Wu, Peng; Dai, Shuqi; Chen, Guangxu; Zhao, Shuaiqi; Xu, Zhi You; Fu, Mingli; Chen, Peirong; Chen, Qin; Jin, Xiaojing; Qiu, Yongcai; Yang, Shihe; Ye, Daiqi

doi:10.1016/j.apcatb.2019.118418

Cited by 114 publications

(62 citation statements)

References 51 publications

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“…With increase the content of α-MnO 2 in α-MnO 2 @MnIn 2 S 4 heterostructure, the absorption of the composite materials in Please do not adjust margins Please do not adjust margins visible light gradually increases, which is beneficial for the easily excitation of semiconductor under visible-light and generate more carriers. Furthermore, the band gap width of α-MnO 2 and MnIn 2 S 4 calculated by the Kubelka-Munk formula are determined to be 1.53 eV and 2.23 eV, respectively, which are consistent with the reported literature 30,34 . Similarly, the positions of the bottom of the valence band (VB) of α-MnO 2 and MnIn 2 S 4 are determined from the VB-XPS analysis and it was found to be 2.61 eV and 1.42 eV, respectively (Fig.…”

Section: Optical Properties Band Structure and Carrier Separation Efsupporting

confidence: 88%

“…The α-MnO 2 nanocubes were prepared by calcining the δ-MnO 2 precursor, where the δ-MnO 2 precursor comes from the etching of MnCO 3 nanocubes by KMnO 4 . Typically 30,35 , 4g of CTAB was added to 100 mL of cyclohexane, and then 5 mL of n-butanol and 0.8 M NH 4 HCO 3 were added. After stirring until the solution becomes clear, 5 mL of 0.4 M MnSO 4 solution was added dropwise.…”

Section: Preparation Of α-Mno 2 Nanocubesmentioning

confidence: 99%

“…The good contact of the heterojunction structure of TiO 2 /MnO 2 has effectively inhibited the recombination of phto-excited electron-hole pairs and improved the catalytic activity. Qiu et al 30 built a Z-scheme mesoporous α-MnO 2 /Mn 3 O 4 heterojunction to promote the photocatalytic oxidation activity by using the characteristics of Mn having multivalent states. It is proposed that the heterojunction of multivalent manganese oxide can efficiently prevent the recombination of photo-generated carriers.…”

Section: Introductionmentioning

confidence: 99%

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Direct Z-scheme α-MnO₂@MnIn₂S₄ hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

et al. 2021

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Section: Optical Properties Band Structure and Carrier Separation Efsupporting

confidence: 88%

Section: Preparation Of α-Mno 2 Nanocubesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct Z-scheme α-MnO₂@MnIn₂S₄ hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

et al. 2021

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“…doping, artificial crystal structure modification, and carbonaceous nanomaterial compositing (carbon nanotubes, graphene, and fullerenes) [4][5][6][7][8][9][10]. Nevertheless, the visible-light energy conversion remains insufficient due to little solar light absorption and many carrier-recombination centers [11,12]. In recent years, black TiO 2 has gained enormous attention owing to its extraordinary visible and infrared…”

Section: Introductionmentioning

confidence: 99%

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

Zhang

Feng

et al. 2020

Nanomaterials

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Defect engineering in photocatalysts recently exhibits promising performances in solar-energy-driven reactions. However, defect engineering techniques developed so far rely on complicated synthesis processes and harsh experimental conditions, which seriously hinder its practical applications. In this work, we demonstrated a facile mass-production approach to synthesize gray titania with engineered surface defects. This technique just requires a simple liquid-plasma treatment under low temperature and atmospheric pressure. The in situ generation of hydrogen atoms caused by liquid plasma is responsible for hydrogenation of TiO 2 . Electron paramagnetic resonance (EPR) measurements confirm the existence of surface oxygen vacancies and Ti 3+ species in gray TiO 2−x . Both kinds of defects concentrations are well controllable and increase with the output plasma power. UV-Vis diffused reflectance spectra show that the bandgap of gray TiO 2−x is 2.9 eV. Due to its extended visible-light absorption and engineered surface defects, gray TiO 2−x exhibits superior visible-light photoactivity. Rhodamine B was used to evaluate the visible-light photodegradation performance, which shows that the removal rate constant of gray TiO 2−x reaches 0.126 min −1 and is 6.5 times of P25 TiO 2 . The surface defects produced by liquid-plasma hydrogenation are proved stable in air and water and could be a candidate hydrogenation strategy for other photocatalysts.Nanomaterials 2020, 10, 342 2 of 13 light absorption, prompting superior performances in photodegradation and water splitting [13][14][15]. The enhanced solar light absorption of black TiO 2 is ascribed to additional intermediate electronic states (e.g., V o or Ti 3+ states) and disorder surface caused by hydrogenation [16][17][18]. More importantly, defect engineering, for instance defects concentration and distribution, also plays an important role in tuning photocatalytic activity of black TiO 2 . It was reported that the high defect ratio of surface to bulk can significantly enhance the photoactivity owing to preferential diffusion from bulk to surface of photoinduced charges [19,20]. However, surface defects are not stable enough as it can be spontaneously oxidized in air and water. So far, mainstream strategies to synthesize black/gray TiO 2−x are relied on the reduction of pristine stoichiometric TiO 2 [20][21][22][23][24], such as annealing under high pressures of H 2 or NH 3 , high-energy particle bombardment (hydrogen plasma, laser plasma, or high-energy electrons), and chemical reduction with reducing agent in vacuum. Apparently, it is significant and desirable to develop a simple and feasible strategy for massive production of black/gray TiO 2−x with engineered surface defects and related abundant solar absorption.Hereafter, we conduct a one-pot synthesis of gray TiO 2−x with large solar harvesting and engineered surface defects using a liquid-plasma technology at room temperature and atmospheric pressure [25]. There has recently been increasing interest in liquid-plasma...

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“…Wu et al. [ 188 ] designed and synthesized a hierarchically porous α‐MnO 2 /Mn 3 O 4 nanostructure using a simple topotactic transformation synthesis strategy. The as‐prepared α‐MnO 2 /Mn 3 O 4 hybrid supplied not only numerous intimate interfaces but also a direct Z‐scheme heterostructure, which greatly promoted catalytic oxidation activity to eliminate volatile organic compounds (VOCs).…”

Section: Fabrication Of Mno2‐based Compositesmentioning

confidence: 99%

MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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Interfacial effects in hierarchically porous α-MnO2/Mn3O4 heterostructures promote photocatalytic oxidation activity

Cited by 114 publications

References 51 publications

Direct Z-scheme α-MnO₂@MnIn₂S₄ hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

Direct Z-scheme α-MnO₂@MnIn₂S₄ hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

MnO₂‐Based Materials for Environmental Applications

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Interfacial effects in hierarchically porous α-MnO2/Mn3O4 heterostructures promote photocatalytic oxidation activity

Cited by 114 publications

References 51 publications

Direct Z-scheme α-MnO2@MnIn2S4 hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

Direct Z-scheme α-MnO2@MnIn2S4 hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

MnO2‐Based Materials for Environmental Applications

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Product

Resources

About

Direct Z-scheme α-MnO₂@MnIn₂S₄ hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

Direct Z-scheme α-MnO₂@MnIn₂S₄ hierarchical photocatalysts with atomically defined junctions for improved photocatalytic activities

MnO₂‐Based Materials for Environmental Applications