Oxygen Reduction Reaction Electrocatalysts Derived from Iron Salt and Benzimidazole and Aminobenzimidazole Precursors and Their Application in Microbial Fuel Cell Cathodes

Mecheri, Barbara; Gokhale, Rohan; Santoro, Carlo; Oliveira, Maida Aysla Costa de; D’Epifanio, Alessandra; Licoccia, Silvia; Serov, Alexey; Artyushkova, Kateryna; Atanassov, Plamen

doi:10.1021/acsaem.8b01360

Cited by 23 publications

(47 citation statements)

References 108 publications

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“…The as fabricated Co‐ZIF, CoZn‐ZIF, and Zn‐ZIF have similar X‐ray diffraction (XRD) patterns, indicating the same coordination structure, which matches well with the reported Zn‐ZIF. [ 14 ] As shown in Figure S2b, Supporting Information, CoZn‐ZIF has a cake‐shape structure with smooth surface and edge‐rich sideface. The average diameter is approximately 3.5 µm and the thickness is about 500 nm.…”

Section: Resultsmentioning

confidence: 99%

Dual Evolution in Defect and Morphology of Single‐Atom Dispersed Carbon Based Oxygen Electrocatalyst

Ban

Wen

et al. 2021

Adv Funct Materials

105

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The structure design and atomic modulation of catalysts are two sides of the same coin, both of which are deemed critical factors to regulate the intrinsic electrocatalytic activity. Herein, cobalt single‐atom anchored on nitrogen‐doped graphene‐sheet@tube (CoSAs‐NGST) is derived from a novel Co, Zn‐coordinated zeolitic imidazolate framework (CoZn‐ZIF) in the presence of dicyandiamide. CoSAs‐NGST exhibited a hybrid structure with a bamboo‐like graphene tube and sheet. The atomic configuration of intrinsic defects is characterized by electron energy loss spectroscopy. The morphology differentiation from cake‐shape structure to low‐dimension hybrid not only enhances the dispersity of single atoms but also induces defect state evolution, which results in the formation of a CoN4‐rich graphene tube. Density functional theory (DFT) modeling revealed that the coupling effect on oxygen reduction reaction and oxygen evolution reaction (ORR/OER) pathways of Co‐N4‐tube and Co‐N4‐sheet is responsible for the enhanced activity of CoSAs‐NGST. In addition to the superb ORR/OER bifunctional catalytic performance, CoSAs‐NGST also demonstrates a notably small charge–discharge voltage drop of 0.93 V when applied in the rechargeable zinc–air battery outperforming Pt/C + RuO2 catalyst. The present study provides an insight into the relationship between the structure design and atomic modulation of the carbon based catalysts.

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Section: Resultsmentioning

confidence: 99%

Dual Evolution in Defect and Morphology of Single‐Atom Dispersed Carbon Based Oxygen Electrocatalyst

Ban

Wen

et al. 2021

Adv Funct Materials

105

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“…The environment pollution generated by use of fossil fuels combined with their depletion demands urgent development of renewable and clean energy technology. In this scenario, fuel cells and electrolyzers offer a good strategy for electrochemical energy storage and conversion; in particular microbial fuel cells are able to generate electricity by the oxidation of organic matter at the anode side promoted by the action of microorganisms [1][2][3]. Oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) are the most crucial cathodic reactions of fuel cell and electrolyzers, respectively.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Fe-N-C as Bifunctional Catalysts for Oxygen Reduction and Hydrogen Evolution

et al. 2021

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The development of electrocatalysts for energy conversion and storage devices is of paramount importance to promote sustainable development. Among the different families of materials, catalysts based on transition metals supported on a nitrogen-containing carbon matrix have been found to be effective catalysts toward oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) with high potential to replace conventional precious metal-based catalysts. In this work, we developed a facile synthesis strategy to obtain a Fe-N-C bifunctional ORR/HER catalysts, involving wet impregnation and pyrolysis steps. Iron (II) acetate and imidazole were used as iron and nitrogen sources, respectively, and functionalized carbon black pearls were used as conductive support. The bifunctional performance of the Fe-N-C catalyst toward ORR and HER was investigated by cyclic voltammetry, rotating ring disk electrode experiments, and electrochemical impedance spectroscopy in alkaline environment. ORR onset potential and half-wave potential were 0.95 V and 0.86 V, respectively, indicating a competitive performance in comparison with the commercial platinum-based catalyst. In addition, Fe-N-C had also a good HER activity, with an overpotential of 478 mV @10 mAcm−2 and Tafel slope of 133 mVdec−1, demonstrating its activity as bifunctional catalyst in energy conversion and storage devices, such as alkaline microbial fuel cell and microbial electrolysis cells.

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“…A more drastic decrease was noticed by Mecheri et al . in which the decrease in power generation of roughly 50%, detected after one-month of operation, then the performance stabilised in the additional month of the test [89]. A much lower decrease in performance is usually observed when AC is used as a cathode catalyst in single chamber membrane-less MFC [44].…”

Section: Discussionmentioning

confidence: 99%

Iron-streptomycin derived catalyst for efficient oxygen reduction reaction in ceramic microbial fuel cells operating with urine

Salar-García

Santoro

Kodali

et al. 2019

Journal of Power Sources

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In recent years, the microbial fuel cell (MFC) technology has drawn the attention of the scientific community due to its ability to produce clean energy and treat different types of waste at the same time. Often, expensive catalysts are required to facilitate the oxygen reduction reaction (ORR) and this hinders their large-scale commercialisation. In this work, a novel iron-based catalyst (Fe-STR) synthesised from iron salt and streptomycin as a nitrogen-rich organic precursor was chemically, morphologically and electrochemically studied. The kinetics of Fe-STR with and without being doped with carbon nanotubes (CNT) was initially screened through rotating disk electrode (RDE) analysis. Then, the catalysts were integrated into air-breathing cathodes and placed into ceramic-type MFCs continuously fed with human urine. The half-wave potential showed the following trend Fe-STR > Fe-STR-CNT ≫ AC, indicating better kinetics towards ORR in the case of Fe-STR. In terms of MFC performance, the results showed that cathodes containing Fe-based catalyst outperformed AC-based cathodes after 3 months of operation. The long-term test reported that Fe-STR-based cathodes allow MFCs to reach a stable power output of 104.5 ± 0.0 μW cm −2 , 74% higher than AC-based cathodes (60.4 ± 3.9 μW cm −2 ). To the best of the Authors' knowledge, this power performance is the highest recorded from ceramic-type MFCs fed with human urine.

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Oxygen Reduction Reaction Electrocatalysts Derived from Iron Salt and Benzimidazole and Aminobenzimidazole Precursors and Their Application in Microbial Fuel Cell Cathodes

Cited by 23 publications

References 108 publications

Dual Evolution in Defect and Morphology of Single‐Atom Dispersed Carbon Based Oxygen Electrocatalyst

Dual Evolution in Defect and Morphology of Single‐Atom Dispersed Carbon Based Oxygen Electrocatalyst

Nanostructured Fe-N-C as Bifunctional Catalysts for Oxygen Reduction and Hydrogen Evolution

Iron-streptomycin derived catalyst for efficient oxygen reduction reaction in ceramic microbial fuel cells operating with urine

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