Efficient Photocatalytic Hydrogen Peroxide Production over TiO2 Passivated by SnO2

Zuo, Guifu; Li, Bingdong; Guo, Zhaoliang; Wang, Liang; Yang, Fan; Hou, Weishu; Zhang, Songtao; Zong, Peixiao; Liu, Shanshan; Meng, Xianguang; Du, Yi; Wang, Tao; Roy, Vellaisamy A. L.

doi:10.3390/catal9070623

Cited by 35 publications

(16 citation statements)

References 31 publications

(42 reference statements)

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“…Several metal oxides have been investigated and studied as additives (or also as a support) for Pt-based catalysts such as SnO 2 [24], TiO 2 [25,26], ZrO 2 [27], IrO 2 [28] showing an enhancement in terms of activity and durability of the catalyst. Among these materials, TiO 2 has attracted a major interest because of its stability in acidic fuel cell environment, as well as the features of being inexpensive, safe (not toxic), and abundant in nature [29,30]. Nevertheless, TiO 2 material cannot be considered as a suitable catalyst support because unmodified and bulk titanium oxides present a low electrical conductivity [31].…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement in Direct Methanol Fuel Cells by Using CaTiO3-δ Additive at the Cathode

et al. 2019

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A non-stoichiometric calcium titanate CaTiO3-δ (CTO) was synthesized and used as oxygen reduction reaction co-catalyst (together with Pt/C) in direct methanol fuel cells (DMFCs). A membrane-electrode assembly (MEA), equipped with a composite cathode formulation (Pt/C:CTO1:1), was investigated in DMFC, using a 2 M methanol solution at the anode and oxygen at the cathode, and compared with an MEA equipped with a benchmark Pt/C cathode catalyst. It appears that the presence of the CTO additive promotes the oxygen reduction reaction (ORR) due to the presence of oxygen vacancies as available active sites for oxygen adsorption in the lattice. The increase in power density obtained with the CTO-based electrode, compared with the benchmark Pt/C, was more than 40% at 90 °C, reaching a maximum power density close to 120 mW cm−2, which is one of the highest values reported in the literature under similar operating conditions.

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Section: Introductionmentioning

confidence: 99%

Performance Improvement in Direct Methanol Fuel Cells by Using CaTiO3-δ Additive at the Cathode

et al. 2019

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“…Zuo et al prepared SnO 2 -TiO 2 heterojunction photocatalyst for H 2 O 2 production and further promoted its activity by depositing Au NPs. [81] The SnO 2 was supposed to improve charge separation in the SnO 2 -TiO 2 heterojunction since the CB of SnO 2 (0 V vs NHE) was more positive than the CB of TiO 2 (−0.3 V vs NHE). The SnO 2 also passivated the TiO 2 surface to suppress H 2 O 2 decomposition.…”

Section: Construction Of Heterojunctionmentioning

confidence: 99%

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Wang

Zhang

et al. 2021

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Hydrogen peroxide (H 2 O 2 ) is a mild but versatile oxidizing agent with extensive applications in bleaching, wastewater purification, medical treatment, and chemical synthesis. The state-of-art H 2 O 2 production via anthraquinone oxidation is hardly considered a cost-efficient and environment-friendly process because it requires high energy input and generates hazardous organic wastes. Photocatalytic H 2 O 2 production is a green, sustainable, and inexpensive process which only needs water and gaseous dioxygen as the raw materials and sunlight as the power source. Inorganic metal oxide semiconductors are good candidates for photocatalytic H 2 O 2 production due to their abundance in nature, biocompatibility, exceptional stability, and low cost. Progress has been made to enhance the photocatalytic activity toward H 2 O 2 production, however, H 2 O 2 photosynthesis is still in the laboratory research phase since the productivity is far from satisfaction. To inspire innovative ideas for boosting the H 2 O 2 yield in photocatalysis, the most well-studied metal oxide photocatalysts are selected and the modification strategies to improve their activity are listed. The mechanisms for H 2 O 2 production over modified photocatalysts are discussed to highlight the facilitating role of the modification methods. Besides, methods for the quantification of H 2 O 2 and associated radical intermediates are provided to guide future studies in this field.

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“…Thus far, several TiO 2 modification strategies such as surface fluorination [23], noble metal deposition [24][25][26] and heterojunction construction [27][28][29][30][31][32][33] have been proposed. The modification techniques improve H 2 O 2 productivity by effectively inhibiting decomposition and promoting interfacial charge separation.…”

Section: Introductionmentioning

confidence: 99%

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

et al. 2021

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Photocatalytic production of hydrogen peroxide (H 2 O 2 ) is an ideal pathway for obtaining solar fuels. Herein, an S-scheme heterojunction is constructed in hybrid TiO 2 /In 2 S 3 photocatalyst, which greatly promotes the separation of photogenerated carriers to foster efficient H 2 O 2 evolution. These composite photocatalysts show a high H 2 O 2 yield of 376 μmol/(L•h). The mechanism of charge transfer and separation within the S-scheme heterojunction is well studied by computational methods and experiments. Density functional theory and in-situ irradiated X-ray photoelectron spectroscopy results reveal distinct features of the S-scheme heterojunction in the TiO 2 /In 2 S 3 hybrids and demonstrate charge transfer mechanisms. The density functional theory calculation and electron paramagnetic resonance results suggest that O 2 reduction to H 2 O 2 follows stepwise one-electron processes. In 2 S 3 shows a much stronger interaction with O 2 than TiO 2 as well as a higher reduction ability, serving as the active sites for H 2 O 2 generation. The work provides a novel design of S-scheme photocatalyst with high H 2 O 2 evolution efficiency and mechanistically demonstrates the improved separation of charge carriers.

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Efficient Photocatalytic Hydrogen Peroxide Production over TiO2 Passivated by SnO2

Cited by 35 publications

References 31 publications

Performance Improvement in Direct Methanol Fuel Cells by Using CaTiO3-δ Additive at the Cathode

Performance Improvement in Direct Methanol Fuel Cells by Using CaTiO3-δ Additive at the Cathode

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

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Efficient Photocatalytic Hydrogen Peroxide Production over TiO2 Passivated by SnO2

Cited by 35 publications

References 31 publications

Performance Improvement in Direct Methanol Fuel Cells by Using CaTiO3-δ Additive at the Cathode

Performance Improvement in Direct Methanol Fuel Cells by Using CaTiO3-δ Additive at the Cathode

Inorganic Metal‐Oxide Photocatalyst for H2O2 Production

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

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Product

Resources

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Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production