Boron-doped rGO electrocatalyst for high effective generation of hydrogen peroxide: Mechanism and effect of oxygen-enriched air

Ri, KwangChol; Pak, SongSik; Sun, Dunyu; Zhong, Qiang; Yang, Shaogui; Sin, SongIl; Wu, Leliang; Sun, Yue; Cao, Hui; Han, Chunxiao; Xu, Chenmin; Liu, Yazi; He, Huan; Li, Shiyin; Sun, Cheng

doi:10.1016/j.apcatb.2023.123471

Cited by 18 publications

(8 citation statements)

References 59 publications

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“…TOC was measured by a TOC analyzer (Analytikjena, multi N/C 3100). The MCE (%) was calculated as follows [49]: MCE(%) = nFV∆(TOC) exp 4.32 × 10 7 mIt × 100 (6) where n is the electrons consumed per SMT molecule during its mineralization and was taken as 52, F is the Faraday constant (96,486 C mol −1 ), V is the bulk volume (L), ∆(TOC) exp is the TOC decay (mg L −1 ), 4.32 × 10 7 is the conversion factor (3600 s h −1 × 12,000 mg C mol −1 ), m represents the number of carbon atoms of SMT (12), and I and t represent current (A) and time (h), respectively.…”

Section: Characterization and Analytical Methodsmentioning

confidence: 99%

“…Specifically, these modified cathodes allowed for the simultaneous generation of H 2 O 2 and • OH on their surface, facilitating the easy separation and recovery of catalysts and enabling continuous operation of the treatment system. Introducing heteroatoms such as nitrogen, sulfur, and phosphorus into the carbon skeleton can alter the chemical properties of carbon materials and improve catalytic activity [12]. Although a large number of transition-metal-based catalysts have been developed to improve the yield of • OH through Fenton-like catalysis, significant drawbacks have been noted, such as rapid release of metal ions and slow catalytic kinetics in neutral and alkaline environments [13].…”

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Treatment of Pharmaceutical Wastewater by Transition Metals Encapsulated by B, N-Doped CNTs

Sha,

Lu,

2023

Catalysts

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The electrochemical advanced oxidation process is a promising technology for tackling wastewater pollution, but it suffers from poor pH adaptability and slow catalytic kinetics in a neutral and alkaline environment in a homogeneous system, as well as fast release of metal ions in a heterogeneous system. Herein, a boron- and nitrogen-codoped carbon nanotube-encapsulated transition metal (M@BN-C, M–Co, Cu) cathode with a similar structure was synthesized to explore activity trends and mechanisms. Characteristics of Co@BN-C and Cu@BN-C cathodes were examined and compared with the previously synthesized Fe@BN-C bifunctional cathode. The activity of sulfamethazine (SMT) degradation by the Co@BN-C cathode was higher than both Fe@BN-C and Cu@BN-C at pH = 3 and pH = 7, respectively. However, the activity of Co@BN-C was also higher than that of Cu@BN-C and lower than that of Fe@BN-C at pH = 9. It was observed that •OH and 1O2 were the main reactive oxygen species (ROS) using Co@BN-C and Cu@BN-C cathodes. The Co@BN-C generated the highest •OH for efficient SMT degradation through abundant H2O2 generation, exhibiting the highest catalytic activity compared with the Cu@BN-C cathode. Overall, SMT degradation on the Co@BN-C cathode demonstrated better catalytic performance in real wastewater. This study provided insights into the fundamental catalytic trends and mechanisms of ROS production via the M@BN-C cathode, thus contributing to the development of the M@BN-C cathode for catalytic organic pollutant degradation.

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Section: Characterization and Analytical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Treatment of Pharmaceutical Wastewater by Transition Metals Encapsulated by B, N-Doped CNTs

Sha,

Lu,

2023

Catalysts

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“…[13] To decrease its overpotential and increase reaction efficiency, carbon materials are doped with heteroatoms (e.g., N, O, B) or non-noble metals. [13,[16][17][18] Based on the above, it can be concluded that, due to the cost, occurrence, and catalytic (in many cases synergistic) properties, carbon-based materials modified with transition metals seem to be the most promising ORR electrocatalysts. [19] Indeed, transition metal particles together with carbon-based materials are already employed as electrodes in billions of electronic or electric devices, including batteries.…”

Section: Introductionmentioning

confidence: 98%

Insights into the High Catalytic Activity of Li‐Ion Battery Waste toward Oxygen Reduction to Hydrogen Peroxide

Warczak,

Osial,

Urbańska

et al. 2024

ChemElectroChem

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Developing highly efficient and cost‐effective electrocatalysts for oxygen reduction reaction (ORR) in aqueous media is crucial for energy conversion systems such as fuel cells or Zn‐air batteries. Electrode materials from spent devices such as lithium‐ion batteries (LiBs) are a serious environmental problem. One of the solutions is their reuse for other electrochemical processes. This work demonstrates the application of solid residues of carbon‐based powders left over from the hydrometallurgical recycling process of LIBs’ waste as efficient catalysts for ORR. Microscopic and spectroscopic studies of the residue disclosed their porous structure and various cobalt contents, depending on the recycling procedure. These battery wastes display ORR catalytic activity when deposited at the liquid‐liquid and solid electrode‐electrolyte interfaces. Scanning Electrochemical Microscopy (SECM) tests showed that assembling battery waste at the liquid‐liquid interface boosts the efficiency of H2O2 production by one to two orders of magnitude. The catalytic activity towards 2‐electron ORR strongly depends on waste powder compositions and structures, e.g., porosity, heteroatom presence, level of defects, and graphitization.

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“…5,6 However, zinc–air batteries also have some problems, such as zinc dendrites and slow cathode reactions. 7,8 Although precious metal catalysts such as Pt/C and RuO 2 can speed up the reaction rate of the cathode, their high cost limits their large-scale use. Most precious metal catalysts can only achieve the effect of OER and ORR catalysis and cannot meet the needs of bifunctional catalysts.…”

Section: Introductionmentioning

confidence: 99%

A graphite/amorphous diamond coupled framework with high ORR and OER performance applied as a cathode catalyst in zinc–air batteries

Yin,

Ma,

Liu

et al. 2024

Sustainable Energy Fuels

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Boron-doped rGO electrocatalyst for high effective generation of hydrogen peroxide: Mechanism and effect of oxygen-enriched air

Cited by 18 publications

References 59 publications

Electrocatalytic Treatment of Pharmaceutical Wastewater by Transition Metals Encapsulated by B, N-Doped CNTs

Electrocatalytic Treatment of Pharmaceutical Wastewater by Transition Metals Encapsulated by B, N-Doped CNTs

Insights into the High Catalytic Activity of Li‐Ion Battery Waste toward Oxygen Reduction to Hydrogen Peroxide

A graphite/amorphous diamond coupled framework with high ORR and OER performance applied as a cathode catalyst in zinc–air batteries

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