A carbon dot-based metal-free photocatalyst enables O2 to serve as both a reactant and electron sink for enhancing H2O2 photoproduction

Wang, Jiaxuan; Liu, Yan; Han, Yidong; Bao, Kaili; He, Tiwei; Huang, Hui; Liu, Yang; Kang, Zhenhui

doi:10.1039/d2ta03865j

Cited by 17 publications

(3 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As for the case of O 2 , the production of H 2 O 2 was inhibited to some extent, but not too much. As reported by the literatures about the synthesis of H 2 O 2 through the ORR pathway, − O 2 as the reactant is significant for the yield rate. Normally, Ar or N 2 purging will result in an obvious decrease of H 2 O 2 generation by reducing the dissolved oxygen and the reactant concentration in an ORR system while O 2 purging will lead to an opposite effect.…”

Section: Resultsmentioning

confidence: 83%

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi₃TiNbO₉ Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Cui,

Wang,

Yuan

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Developing green, efficient, and sustainable techniques to synthesize hydrogen peroxide has always been the challenge faced by researchers. The rising-star piezocatalysis has been demonstrated to be capable of drive redox reactions based on the piezoelectric effect and therefore may provide novel solutions for H 2 O 2 production through mechanical energy conversion. Herein, the bismuth layered compound Bi 3 TiNbO 9 (BTNO) was utilized to produce H 2 O 2 by harvesting ultrasound vibration in a pure water system for the first time. A yield rate of 407.05 μmol• g −1 •h −1 was achieved under ultrasonic conditions (40 kHz, 50 W) without any cocatalysts and scavengers, surpassing the majority of the reported piezocatalysts with similar mechanisms. Furthermore, a satisfied circulation and long-term running stability of piezocatalyst BTNO were proved, and the accumulated concentration of H 2 O 2 could reach 1127 μM after 5 h of reaction. The satisfied piezoelectric response of BTNO was demonstrated by piezoresponse force microscopy (PFM), electrochemical characterization, and piezodeposition experiments. On the basis of band structure analysis, the possible pathway of generating hydrogen peroxide by piezocatalysis with BTNO was proposed according to the radical-trapping and atmosphere control experiment results. It was found that both the water oxidation reaction (WOR) and oxygen reduction reaction (ORR) contributed to the yield of H 2 O 2 , but direct WOR plays an absolute dominant role. In addition, Ar sparging was verified to be able to efficiently enhance the generation of H 2 O 2 due to the enlarged cavitation effect, and piezocatalysis of BTNO was found to be superior to its photocatalysis in synthesizing H 2 O 2 . It is hoped that this work can provide deep insights into piezocatalysis for H 2 O 2 generation and offer clues for the green, sustainable synthesis of hydrogen peroxide.

show abstract

Section: Resultsmentioning

confidence: 83%

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi₃TiNbO₉ Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Cui,

Wang,

Yuan

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…2c, electrochemical impedance spectroscopy (EIS) measurements were also performed to estimate the carrier transmission ability of the photocatalysts. 40 With the addition of CDs, all the semicircle arcs of x % CDs/p(DB) become smaller than that of p(DB), suggesting that CDs decrease the charge transfer resistance. In addition, the semicircle arc of 1% CDs/p(DB) is the smallest while those of 3%, 5% and 7% CDs/p(DB) are similar, indicating that the improvement of charge transfer by CDs reaches saturation.…”

Section: Resultsmentioning

confidence: 97%

Bifunctional carbon dots as cocatalyst and reactor decorating an organic photocatalyst for H₂ production from water-splitting in an emulsion

Qiang

Wang

et al. 2023

J. Mater. Chem. A

Self Cite

View full text Add to dashboard Cite

show abstract

“…Inspired by this pioneering study, Kang and co-workers further designed a metal-free photocatalyst with in situ generated CDs by annealing dextran. [92] The as-synthesized CDs could tune the interface transference by storing charges. In situ transient photovoltage (TPV) measurements showed a larger time attenuation constant in the presence of CDs, indicating the slower recombination rate of the photoexcited charge carrier.…”

Section: Size Effectmentioning

confidence: 99%

Clean Production of Hydrogen Peroxide: A Heterogeneous Solar‐Driven Redox Process

2023

Advanced Energy Materials

View full text Add to dashboard Cite

Hydrogen peroxide is an essential chemical that is attracting strong attention for energy and environmental applications. However, the struggle between the growing market demand and the unsustainability of the conventional anthraquinone method motivates the exploration of alternative H2O2 production processes. Although several new production processes have been proposed, the environmental‐friendly solar‐driven H2O2 production attracts most attention because of the only inputs of water, oxygen, and light energy. The rational design of functional photo‐responsive catalysts promotes H2O2 production in the photocatalytic and photoelectrocatalytic approaches. These are, in general, achieved by facilitating the preferential adsorption of key intermediates of OOH*/OH*/O*, enhancing the light absorption, promoting the charge separation, and accelerating the surface charge transfer with selective number of involved charges. This review systematically summarizes strategies for photo(electro)catalysts toward H2O2 production via both the water oxidation and oxygen reduction pathways. Though the oxygen reduction route is perceived as more popular in the community, selective water oxidation is emerging as a convincing alternative. Furthermore, prevailing hypotheses, state‐of‐the‐art catalysts, critical challenges, and perspectives are discussed in depth. This review aims to enhance the comprehension of this research field and promote interest in sustainable H2O2 production.

show abstract

A carbon dot-based metal-free photocatalyst enables O₂ to serve as both a reactant and electron sink for enhancing H₂O₂ photoproduction

Abstract: Photocatalytic oxygen reduction by a two-electron way is the most clean and green method for hydrogen peroxide (H2O2) production. However, in the most catalytic systems, the function of oxygen is...

Cited by 17 publications

References 45 publications

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi₃TiNbO₉ Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi₃TiNbO₉ Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Bifunctional carbon dots as cocatalyst and reactor decorating an organic photocatalyst for H₂ production from water-splitting in an emulsion

Clean Production of Hydrogen Peroxide: A Heterogeneous Solar‐Driven Redox Process

Contact Info

Product

Resources

About

A carbon dot-based metal-free photocatalyst enables O2 to serve as both a reactant and electron sink for enhancing H2O2 photoproduction

Abstract: Photocatalytic oxygen reduction by a two-electron way is the most clean and green method for hydrogen peroxide (H2O2) production. However, in the most catalytic systems, the function of oxygen is...

Cited by 17 publications

References 45 publications

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi3TiNbO9 Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi3TiNbO9 Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Bifunctional carbon dots as cocatalyst and reactor decorating an organic photocatalyst for H2 production from water-splitting in an emulsion

Clean Production of Hydrogen Peroxide: A Heterogeneous Solar‐Driven Redox Process

Contact Info

Product

Resources

About

A carbon dot-based metal-free photocatalyst enables O₂ to serve as both a reactant and electron sink for enhancing H₂O₂ photoproduction

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi₃TiNbO₉ Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Harvesting Vibration Energy to Produce Hydrogen Peroxide with Bi₃TiNbO₉ Nanosheets through a Water Oxidation Dominated Dual-Channel Pathway

Bifunctional carbon dots as cocatalyst and reactor decorating an organic photocatalyst for H₂ production from water-splitting in an emulsion