Unassisted selective solar hydrogen peroxide production by an oxidised buckypaper-integrated perovskite photocathode

Mehrotra, Rashmi; Oh, Dongrak; Jang, Ji‐Wook

doi:10.1038/s41467-021-26832-5

Cited by 28 publications

(32 citation statements)

References 50 publications

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“…The employment of inorganic−organic-or organic-based materials 35,44 could overcome the limitations of inorganic semiconductors as the former have an optimum bandgap of 1.6−1.8 eV and exhibit superior charge transfer characteristics. 67,68 The resulting inorganic−organic- 44 and organicbased 35 photoelectrodes achieved SCC efficiencies of 1.46 and 3.24%, respectively, which are higher than those of metal oxide-based photoelectrodes (0.1−1% SCC efficiency) (Figure 5).…”

Section: Benchmarking Solar-to-chemical Conversion Efficiency Of Bias...mentioning

confidence: 99%

“…To overcome this issue, Mehrotra et al developed a buried junction-based photocathode using a perovskite passivated with Field’s metal (FM) and a H 2 O 2 -selective electrocatalyst . In the buried junction photoelectrochemical cell, the internal junction is isolated from the liquid, so the produced photovoltage is not fixed relative to a specific material flat band potential, unlike a traditional semiconductor–liquid junction .…”

Section: Single Photoelectrochemical H2o2 Production From 2e– Orrmentioning

confidence: 99%

“…Figure 5. SCC efficiency benchmarking of bias-free photoelectrochemical H 2 O 2 production cells 5,[27][28][29]35,37,44,53,[58][59][60]63,65. …”

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confidence: 99%

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Bias-Free Photoelectrochemical H₂O₂ Production and Its In Situ Applications

Lim

Jang

2023

ACS EST Eng.

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Hydrogen peroxide (H2O2) is a valuable chemical that has been used in a wide range of applications. Currently, H2O2 production relies predominantly on the anthraquinone process, which is energy-intensive and non-ecofriendly. The photoelectrochemical two-electron O2 reduction reaction (2e– ORR) and 2e– water oxidation reaction (2e– WOR) have recently emerged as promising alternatives to produce H2O2 in a bias-free, cost-effective, and environmentally benign manner. In this Perspective, we overview photoelectrochemical routes to H2O2 production and its in situ application for valuable chemical synthesis. We discuss the design principles needed for achieving a bias-free photoelectrochemical H2O2 synthesis and introduce the concept of single and dual constructions, with notable examples of each one. We benchmark the solar-to-chemical conversion efficiencies of photoelectrochemical H2O2 synthesis cells. Further, we present the application of photoelectrochemically produced H2O2 for in situ green chemical synthesis. Finally, we provide future perspectives on this emerging field, discussing its main limitations and targets for further development, including high performance, stability of produced H2O2, and practical viability.

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Section: Benchmarking Solar-to-chemical Conversion Efficiency Of Bias...mentioning

confidence: 99%

Section: Single Photoelectrochemical H2o2 Production From 2e– Orrmentioning

confidence: 99%

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Bias-Free Photoelectrochemical H₂O₂ Production and Its In Situ Applications

Lim

Jang

2023

ACS EST Eng.

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“…Hydrogen peroxide (H 2 O 2 ) as the basic chemical for a variety of industries, is widely used in wastewater treatment 1 , bio-disinfection 2 , chemical synthesis 3 , bleaching 4 , and fuel cell in the energy eld [5][6][7] . Harnessing oxygen as a feedstock is a means of achieving green H 2 O 2 synthesis and a promising method to overcome the imbalance of a tight supply and an annual increase in demand of more than 5% 8 .…”

Section: Resultsmentioning

confidence: 99%

Enduring and Instant H2O2 Generation via Controlled Coupling Transfer

Zhao¹,

Duan

et al. 2022

Preprint

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Extremely slow kinetics and limited accumulation of H2O2 during the oxygen reduction reaction, which derives from the negative effects of diffusion-limited and further catalysis, are the grant challenges seriously hindering the development of green H2O2 synthesis. Herein, we first controlled the coupling energy of the proton and electron by periodic-potential-driven catalysis, achieving 56-fold greater H2O2 accumulation than that generated by constant-potential catalysis. To modulate proton and electron coupling transfer, we employed optimized dual-electrolytes to achieve a rate of 45900 mmol gcat−1 h− 1, and provided strong evidence of molecular-level understanding via comprehensive microenvironment simulation. These results were obtained with a pyrolytic metal/reduced cage crystal (RCC1) catalyst with stable performance reaching 3.6 million pulses, which generated products that can be directly utilized for the complete removal of bacteria in 2 seconds from seawater. Our systemic methodology and in situ application are anticipated to aid in the design of innovative catalysts, provide a deep understanding of pulse and electrolyte effects, and aid in the design of a new effective cell system to achieve industry-level H2O2 production.

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“…Currently, environmental and energy issues have attracted increasing attention, where one of the feasible methods to alleviate these issues is considered the use of solar energy for photocatalysis to produce clean sources. [1][2][3][4] The process of photocatalysis is simple and convenient, which involves dispersing a photocatalyst in water and then yielding a product under light, which has good prospect for industrialization. 5,6 Hydrogen peroxide (H 2 O 2 ), as an alternative clean oxidant material, [7][8][9][10] has the advantages of convenient transportation and higher energy density than hydrogen, exhibiting wide application in synthesis, industry and other elds.…”

Section: Introductionmentioning

confidence: 99%