Improvement in electrocatalytic activity of oxygen reduction reaction of electrospun carbon nitride/polyacrylonitrile nanofibers by addition of carbon black and Nafion® fillers

Jindal, Amandeep; Basu, Suddhasatwa

doi:10.1016/j.ijhydene.2016.02.136

Cited by 10 publications

(11 citation statements)

References 28 publications

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“…TEM image of CN x nanofibers (Figure ) shows that CN x is dispersed as a layer on PAN nanofiber (region I) which is different from the PAN nanofiber that does not have CN x layer (region II). In some regions of CN x nanofibers, CN x is non‐uniformly distributed in PAN nanofibers, as has been shown in the previous study . Nafion ® dispersion renders stability to CN x layer on PAN nanofibers due to its binding properties and offers proton conductivity, required for ORR.…”

Section: Resultssupporting

confidence: 57%

“…The detailed physical and electrochemical characterization in a 3‐electrode assembly of CN x nanofibers as ORR catalyst are discussed in our previous study . The successful incorporation of Nafion ® into the CN x nanofibers, added to the CN x /PAN/DMF solution during the electrospinning process, is confirmed by presence of F‐ and ‐signal in the wide scan X‐ray photospectroscopy (XPS) spectrum in the mentioned study.…”

Section: Resultsmentioning

confidence: 61%

“…It improves the electrocatalytic activity of CN x nanofibers towards ORR. N‐content is observed by XPS to be 27% out of which 46% is pyridinic N, 29% is pyrrolic N and 25% is amino N . The ORR activity of CN x nanofibers is found to be comparable to Pt/C catalysts.…”

Section: Resultsmentioning

confidence: 92%

“…The onset potential and peak current density for KMnO 4 reduction on CN x nanofibers (1.5 V and 16.8 mA cm −2 ) is comparable to Pt black (1.5 V, 22.1 mA cm −2 ). The onset potential, the potential at which slope of the LSV plot changes prior to the KMnO 4 reduction peak, and peak current density for KMnO 4 reduction on CN x nanofibers is much improved as compared to oxygen reduction reaction (0.95 V, 6.32 mA cm −2 ) . This is attributed to better cathodic electron accepting ability of KMnO 4 as compared to oxygen .…”

Section: Resultsmentioning

confidence: 92%

“…In our previous studies, electrospun CN x nanofibers, which does not include metals in their active sites, show significant improvement in ORR activity as compared to native CN x nanoparticles and slightly less active than Pt/C catalyst . Although half cell studies in three electrode cell assembly show high activity of CN x catalyst towards ORR, but application of CN x cathode in PEM fuel cell does not show encouraging results possibly due to less number of active sites compared to that in Pt/C accessible to oxygen in air.…”

Section: Introductionmentioning

confidence: 92%

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Direct Formic Acid PEM Fuel Cell with Electrospun Carbon Nitride Nanofibers as Cathode Catalyst

2017

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Carbon nitride (CNx) nanofiber is tested as a cathode catalyst in the direct formic acid proton exchange membrane (PEM) fuel cell at room temperature. CNx nanofiber is synthesized by electrospinning technique with polyacrylonitrile (PAN) as a supporting polymer and carbon black and Nafion® dispersion as fillers. Potassium permanganate (0.144M) is used as oxidant, due to its higher reduction potential (1.7 V) as compared to O2. CNx nanofibers show fuel cell activity with current density (23 mA cm−2) and power density (6.77 mW cm−2) comparable to Pt black catalyst loading (43 mA cm−2, 12.90 mW cm−2) at 300 mV.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 92%

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Direct Formic Acid PEM Fuel Cell with Electrospun Carbon Nitride Nanofibers as Cathode Catalyst

2017

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Hollow Carbon Nanoballs on Graphene as Metal‐Free Catalyst for Overall Electrochemical Water Splitting

Begum

Ahmed

Jung

2021

Adv Materials Inter

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A great deal of research effort has been dedicated for designing an efficient bifunctional metal‐free carbon catalyst for electrochemical water splitting, however, it remains challenging to introduce multiactive sites into a single catalyst. Herein, a series of bifunctional catalysts is designed that exploit intramolecular reorientation of nitrogen atom within the hollow nanoball from polyacrylonitrile on graphene through thermal treatment to achieve covalent doping. The as synthesized hollow carbon nanoballs on graphene (HCNB@G) catalysts have huge defective edges and microporous channels and contain a high density of electroactive graphitic‐N and pyridinic‐N as dual‐active sites. As a result, the optimized HCNB@G‐700 enhances electrocatalytic activities for both oxygen evolution and hydrogen evolution reactions (OER and HER) in 1.0 m KOH by generating 217 and 108 mV overpotential to gain a current density of 10 mA cm−2, respectively. This remarkable electrocatalytic activity mainly originates from the appropriate combination of suitable nitrogen active sites and edge defects with microchannels that not only facilitate the penetration of electrolyte but also improve the stability of the HCNB@G. In addition, the superior conductivity and high surface area of HCNB@G boost electrocatalytic activity by supporting efficient charge transport and enabling rapid mass diffusion with gas release, respectively.

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Stable and Efficient Nitrogen‐Containing Carbon‐Based Electrocatalysts for Reactions in Energy‐Conversion Systems

et al. 2018

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High activity and stability are crucial for the practical use of electrocatalysts in fuel cells, metal-air batteries, and water electrolysis, including the oxygen reduction reaction, hydrogen evolution reaction, oxygen evolution reaction, and oxidation reactions of formic acid and alcohols. Electrocatalysts based on nitrogen-containing carbon (N-C) materials show promise in catalyzing these reactions; however, there is no systematic review of strategies for the engineering of active and stable N-C-based electrocatalysts. Herein, a comprehensive comparison of recently reported N-C-based electrocatalysts regarding both electrocatalytic activity and long-term stability is presented. In the first part of this review, the relationships between the electrocatalytic reactions and selection of the element to modify the N-C-based materials are discussed. Afterwards, synthesis methods for N-C-based electrocatalysts are summarized, and strategies for the synthesis of highly stable N-C-based electrocatalysts are presented. Multiple tables containing data on crucial parameters for both electrocatalytic activity and stability are displayed in this review. Finally, constructing M-N moieties is proposed as the most promising engineering strategy for stable N-C-based electrocatalysts.

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Improvement in electrocatalytic activity of oxygen reduction reaction of electrospun carbon nitride/polyacrylonitrile nanofibers by addition of carbon black and Nafion® fillers

Cited by 10 publications

References 28 publications

Direct Formic Acid PEM Fuel Cell with Electrospun Carbon Nitride Nanofibers as Cathode Catalyst

Direct Formic Acid PEM Fuel Cell with Electrospun Carbon Nitride Nanofibers as Cathode Catalyst

Hollow Carbon Nanoballs on Graphene as Metal‐Free Catalyst for Overall Electrochemical Water Splitting

Stable and Efficient Nitrogen‐Containing Carbon‐Based Electrocatalysts for Reactions in Energy‐Conversion Systems

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