Enhancement of the photoelectrochemical production of hydrogen peroxide under intermittent light supply in the presence of an optimized biochar supercapacitor

Dhawle, Rebecca; Vakros, John; Dracopoulos, Vassilios; Manariotis, Ioannis D.; Mantzavinos, Dionissios; Lianos, Panagiotis

doi:10.1016/j.electacta.2022.140846

Cited by 11 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wheat, the world's third-largest cereal, is also a great source of biochar feedstock due to its malt roots. It can be used to make supercapacitor electrodes, which have increased supercapacitance values because of the material's good specific surface area [35,36]. Biochar made from agricultural waste has the advantage that raw materials are easily accessible and abundant.…”

Section: Agricultural and Forest Wastesmentioning

confidence: 99%

Research on the Preparation of Biochar from Waste and Its Application in Environmental Remediation

Wang,

Huang,

et al. 2023

Water

View full text Add to dashboard Cite

Biochar is a carbon-rich material that can be composed of a variety of raw materials. From the perspective of resource reuse, it is quite feasible to use waste as a raw material for the preparation of biochar. This paper provides an overview of the types of waste that can be used to prepare biochar and their specific substances, and also summarises methods to enhance or improve the performance of biochar, including physical, chemical, biological and other methods. The feedstock for biochar includes four categories: agricultural and forestry waste, industrial by-products, municipal solid waste and other non-traditional materials. This paper also summarises and classifies the role played by biochar in environmental applications, which can be classified according to its role as an adsorbent, catalyst and soil conditioner, and other applications. In addition to being widely used as an adsorbent, catalyst and activator, biomass charcoal also has good application prospects as a soil remediation agent, amendment agent and supercapacitor, and in soil carbon sequestration. Finally, some ideas and suggestions are detailed for the present research and experiments, offering new perspectives for future development.

show abstract

Section: Agricultural and Forest Wastesmentioning

confidence: 99%

Research on the Preparation of Biochar from Waste and Its Application in Environmental Remediation

Wang,

Huang,

et al. 2023

Water

View full text Add to dashboard Cite

show abstract

“…For example, four different carbon materials, Vulcan XC-72R, carbon nanotubes, graphene, and biochar were used as supports for electrocatalysts in fuel cell applications and it has been reported that other characteristics, like the crystalline phase and the point of zero charge of the carbon material, affect the interactions between the carbon and metal phase and consequently the electrocatalytic activity [39]. Also, biochar from spent malt rootlets untreated or with various chemical treatments was used as supercapacitors [40] or as an electrode for the production of H 2 O 2 [41], and the influence of the SSA was not significant.…”

Section: Introductionmentioning

confidence: 99%

Study of the Suitability of Corncob Biochar as Electrocatalyst for Zn–Air Batteries

Soursos,

Kottis,

Premeti

et al. 2024

Batteries

Self Cite

View full text Add to dashboard Cite

There has been a recent increasing interest in Zn–air batteries as an alternative to Li-ion batteries. Zn–air batteries possess some significant advantages; however, there are still problems to solve, especially related to the tuning of the properties of the air–cathode which should carry an inexpensive but efficient bifunctional oxygen reduction (ORR) and oxygen evolution (OER) reaction electrocatalyst. Biochar can be an alternative, since it is a material of low cost, it exhibits electric conductivity, and it can be used as support for transition metal ions. Although there is a significant number of publications on biochars, there is a lack of data about biochar from raw biomass rich in hemicellulose, and biochar with a small number of heteroatoms, in order to report the pristine activity of the carbon phase. In this work, activated biochar has been made by using corncobs. The biomass was first dried and minced into small pieces and pyrolyzed. Then, it was mixed with KOH and pyrolyzed for a second time. The final product was characterized by various techniques and its electroactivity as a cathode was determined. Physicochemical characterization revealed that the biochar had a hierarchical pore structure, moderate surface area of 92 m2 g−1, carbon phase with a relatively low sp2/sp3 ratio close to one, and a limited amount of N and S, but a high number of oxygen groups. The graphitization was not complete while the biochar had an ordered structure and contained significant O species. This biochar was used as an electrocatalyst for ORR and OER in Zn–air batteries where it demonstrated a satisfactory performance. More specifically, it reached an open-circuit voltage of about 1.4 V, which was stable over a period of several hours, with a short-circuit current density of 142 mA cm−2 and a maximum power density of 55 mW cm−2. Charge–discharge cycling of the battery was achieved between 1.2 and 2.1 V for a constant current of 10 mA. These data show that corncob biochar demonstrated good performance as an electrocatalyst in Zn–air batteries, despite its low specific surface and low sp2/sp3 ratio, owing to its rich oxygen sites, thus showing that electrocatalysis is a complex phenomenon and can be served by biochars of various origins.

show abstract

“…Later on, the progress has been made by modifying the TiO 2 as a photocatalyst for various applications. Lianos and co-workers reported CdS/TiO 2 as a photoanode used in the two-compartment cell for H 2 O 2 production. ,,, The industrial-scale synthesis of H 2 O 2 is done by the anthraquinone method . AQ displays some advantageous properties like significant electron affinities and good thermal and electrochemical stability, and most of the derivatives of this molecule are synthetically relatively easily accessible .…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Production of Hydrogen Peroxide with TiO₂ and 1,5-Di(thien-2-yl)-9,10-anthraquinone via a Selective Two-Electron Oxygen Reduction Reaction in the Two-Compartment Cell

et al. 2023

View full text Add to dashboard Cite

The industrial process of hydrogen peroxide (H 2 O 2 ) synthesis proceeds through the hydrogenation of anthraquinone followed by successive oxidation in an organic solvent. This process is a multistep synthesis that is far away from green synthesis. An alternative photoelectrochemical (PEC) H 2 O 2 production method requires only sunlight and water. Herein, we established the direct production of H 2 O 2 by using a twocompartment PEC cell composed of TiO 2 nanorods hydrothermally grown on fluorine-doped tin oxide as a photoanode for water oxidation and 1,5-di(thien-2-yl)-9,10-anthraquinone (AQTh) anchored carbon cloth as a cathode for the selective two-electron (2e − ) reduction of oxygen. This photoanode and cathode are positioned in an anodic compartment and a cathodic compartment of a two-compartment cell, respectively. The Nafion membrane (N-117) separates these two compartments. This PEC cell continuously produces H 2 O 2 at −0.1 V RHE applied voltage, which reaches 60 μM after 3 h. The density functional theory study is carried out to better understand the H 2 O 2 production mechanism and the role of thiophene substituents on anthraquinone.

show abstract

Enhancement of the photoelectrochemical production of hydrogen peroxide under intermittent light supply in the presence of an optimized biochar supercapacitor

Cited by 11 publications

References 29 publications

Research on the Preparation of Biochar from Waste and Its Application in Environmental Remediation

Research on the Preparation of Biochar from Waste and Its Application in Environmental Remediation

Study of the Suitability of Corncob Biochar as Electrocatalyst for Zn–Air Batteries

Photoelectrochemical Production of Hydrogen Peroxide with TiO₂ and 1,5-Di(thien-2-yl)-9,10-anthraquinone via a Selective Two-Electron Oxygen Reduction Reaction in the Two-Compartment Cell

Contact Info

Product

Resources

About

Enhancement of the photoelectrochemical production of hydrogen peroxide under intermittent light supply in the presence of an optimized biochar supercapacitor

Cited by 11 publications

References 29 publications

Research on the Preparation of Biochar from Waste and Its Application in Environmental Remediation

Research on the Preparation of Biochar from Waste and Its Application in Environmental Remediation

Study of the Suitability of Corncob Biochar as Electrocatalyst for Zn–Air Batteries

Photoelectrochemical Production of Hydrogen Peroxide with TiO2 and 1,5-Di(thien-2-yl)-9,10-anthraquinone via a Selective Two-Electron Oxygen Reduction Reaction in the Two-Compartment Cell

Contact Info

Product

Resources

About

Photoelectrochemical Production of Hydrogen Peroxide with TiO₂ and 1,5-Di(thien-2-yl)-9,10-anthraquinone via a Selective Two-Electron Oxygen Reduction Reaction in the Two-Compartment Cell