Engineered biochar derived from pyrolyzed waste tea as a carbon support for Fe-N-C electrocatalysts for the oxygen reduction reaction

Zago, Stefano; Bartoli, Mattia; Muhyuddin, Mohsin; Vanacore, Giovanni Maria; Jagdale, Pravin; Tagliaferro, Alberto; Santoro, Carlo; Specchia, Vito

doi:10.1016/j.electacta.2022.140128

Cited by 40 publications

(21 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…38,39 Chronoamperometry measurements were also carried out for 10,000 s at a constant potential of 0.6 V vs RHE in NaOH 0.1 M under an oxygensaturated atmosphere. After 5000 s, only 20% of the original obtained current was lost, and 25% after 10,000 s. The results are comparable with the stability of pyrolyzed catalysts 96,98 suggesting that the competence of alkaline electrolyte (OH − ) to interfere during the electrocatalytic process is not of considerable importance.…”

Section: Acs Catalysissupporting

confidence: 61%

“…Evidence of a demetallation process favored in the presence of a high concentration of HO − as the supporting electrolyte has been reported. 95 In the Supporting Information file Figure S2a,b, we show the durability test after 5000 cycles (0.6 to 1.0 V vs RHE) 96,97 performed in an O 2 -saturated atmosphere which indicates that there is only a negligible loss of half-wave potential (ΔE cycle 1 to 5000 = 10 mV) proving the high stability in alkaline media, which is also corroborated by high TOF values going from 1.18 to 1.03 e − site −1 s −1 , as shown in the inset of Figure S2a, in coherence with the literature. 38,39 Chronoamperometry measurements were also carried out for 10,000 s at a constant potential of 0.6 V vs RHE in NaOH 0.1 M under an oxygensaturated atmosphere.…”

Section: Acs Catalysismentioning

confidence: 99%

See 1 more Smart Citation

Effect of Electrolyte Media on the Catalysis of Fe Phthalocyanine toward the Oxygen Reduction Reaction: Ab Initio Molecular Dynamics Simulations and Experimental Analyses

et al. 2022

View full text Add to dashboard Cite

FeN4 macrocycles are among the most promising nonprecious metal catalysts for the oxygen reduction reaction (ORR). Nevertheless, these catalysts perform poorly in acidic media. To understand what impedes the use of these catalysts in acid, graphite electrodes were drop-coated with inks of iron phthalocyanine adsorbed on carbon nanotubes (FePc-CNTs), and the electrocatalytic behavior of the catalyst was studied in four different supporting electrolytes (i.e., HCl, H2SO4, CH3COOH, and NaOH) by means of cyclic voltammetry, polarization curves, and electrochemical impedance spectroscopy. Electrolyte media are theoretically analyzed by ab initio molecular dynamic simulations, with explicit water molecules, to explain and visualize the occurring physical adsorption phenomena. The demetallation of the catalyst could be excluded because more than 3.6 eV would be necessary for this process to occur. In addition, the absorption of the anion of the specific acids at the Fe center was found to compete with the coordination of oxygen and prevent the catalytic process, modifying the ORR rate-determining step and the final product of the reaction. An electrochemical analysis and impedance spectroscopy corroborate this process.

show abstract

Section: Acs Catalysissupporting

confidence: 61%

Section: Acs Catalysismentioning

confidence: 99%

Effect of Electrolyte Media on the Catalysis of Fe Phthalocyanine toward the Oxygen Reduction Reaction: Ab Initio Molecular Dynamics Simulations and Experimental Analyses

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Therefore, the pore structure of the biochar became obvious. After doping with Fe and N, irregular nanoparticles were discovered on the surface of biochar (Figure e), further generating the pore structure . The dark dots distributed in the carbon structure in the TEM images indicate that the iron oxide nanoparticles are highly dispersed.…”

Section: Resultsmentioning

confidence: 99%

“…After doping with Fe and N, irregular nanoparticles were discovered on the surface of biochar ( Figure 1 e), further generating the pore structure. 38 The dark dots distributed in the carbon structure in the TEM images indicate that the iron oxide nanoparticles are highly dispersed. The pyrolyzed biochar was finer than palm fiber biochar, with rougher surfaces, more voids, and a more regular carbon structure with less overlap.…”

Section: Resultsmentioning

confidence: 99%

Efficient Adsorption of a Sulfonamide Antibiotic in Aqueous Solutions with N-doped Magnetic Biochar: Performance, Mechanism, and Reusability

Diao

Shan

et al. 2022

ACS Omega

View full text Add to dashboard Cite

Conventional biochar has limited effectiveness in the adsorption of sulfonamide antibiotics, while modified biochar exhibits greater adsorption potential. Residues of sulfamethoxazole (SMX) in the aquatic environment can threaten the safety of microbial populations as well as humans. In this study, iron–nitrogen co-doped modified biochar (Fe-N-BC) was prepared from palm fibers and doped with Fe and urea via synthesis at 500 °C. Fe-N-BC has a richer surface functional group based on elemental content, X-ray photoelectron spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The Brunauer–Emmett–Teller (BET) specific surface area test exhibited Fe-N-BC, which possessed a greater surface area (318.203 m2/g) and a better developed pore structure (0.149 cm3/g). The results of the hysteresis loop and the Raman spectrum show that Fe-N-BC has a higher degree of magnetization and graphitization. Fe-N-BC showed a remarkable adsorption capacity for SMX (42.9 mg/g), which could maintain 93.4% adsorption effect after four cycles, and 82.8% adsorption capacity in simulated piggery wastewater. The adsorption mechanism involves pore filling, surface complexation, electrostatic interactions, hydrogen bonding, and π–π EDA interactions. The results of this study show that Fe-N-BC prepared from palm fibers can be a stable, excellent adsorbent for SMX removal from wastewater and has promise in terms of practical applications.

show abstract

“…Therefore, valorization of waste biomass into useful and cost-effective nanomaterials through pyrolysis could be a lucid idea considering the rewards of ecological wellbeing [34]. For that reason, a huge scientific interest in biomassderived HER and ORR electrocatalysts has been witnessed in the past few years [28,29,[34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Valorization of the inedible pistachio shells into nanoscale transition metal and nitrogen codoped carbon-based electrocatalysts for hydrogen evolution reaction and oxygen reduction reaction

Muhyuddin

Zocche

Lorenzi

et al. 2022

Mater Renew Sustain Energy

Self Cite

View full text Add to dashboard Cite

Making a consistency with the objectives of circular economy, herein, waste pistachios shells were utilized for the development of hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) electrocatalysts which are the key bottleneck in the technological evolution of electrolyzers and fuel cells, respectively. As an alternative to scarce and expensive platinum-group-metal (PGM) electrocatalysts, metal nitrogen carbons (MNCs) are emerging as a promising candidate for both aforementioned electrocatalysis where iron and nickel are the metal of choice for ORR and HER, respectively. Therefore, FeNCs and NiNCs were fabricated utilizing inedible pistachio shells as a low-cost biosource of carbon. The steps involved in the fabrication of electrocatalyst were correlated with electrochemical performance in alkaline media. Encouraging onset potential of ~ 0.88 V vs RHE with a possibility of a 2 + 2 reaction pathway was observed in pyrolyzed and ball-milled FeNC. However, HF etching for template removal slightly affected the kinetics and eventually resulted in a relatively higher yield of peroxide. In parallel, the pyrolyzed NiNC demonstrated a lower HER overpotential of ~ 0.4 V vs RHE at − 10 mA cm−2. Nevertheless, acid washing adversely affected the HER performance and consequently, very high overpotential was witnessed.

show abstract

Engineered biochar derived from pyrolyzed waste tea as a carbon support for Fe-N-C electrocatalysts for the oxygen reduction reaction

Cited by 40 publications

References 69 publications

Effect of Electrolyte Media on the Catalysis of Fe Phthalocyanine toward the Oxygen Reduction Reaction: Ab Initio Molecular Dynamics Simulations and Experimental Analyses

Effect of Electrolyte Media on the Catalysis of Fe Phthalocyanine toward the Oxygen Reduction Reaction: Ab Initio Molecular Dynamics Simulations and Experimental Analyses

Efficient Adsorption of a Sulfonamide Antibiotic in Aqueous Solutions with N-doped Magnetic Biochar: Performance, Mechanism, and Reusability

Valorization of the inedible pistachio shells into nanoscale transition metal and nitrogen codoped carbon-based electrocatalysts for hydrogen evolution reaction and oxygen reduction reaction

Contact Info

Product

Resources

About