Effect of carbon precursor and initial pH on cobalt-doped carbon xerogel for oxygen reduction

Abidin, Azim Fitri Zainul; Loh, Kee Shyuan; Wong, Wai Yin; Mohamad, Abu Bakar; Puspasari, Ifa

doi:10.1016/j.ijhydene.2018.05.015

Cited by 17 publications

(10 citation statements)

References 31 publications

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“…In this study, it is observed that the presence of the graphitic phase is limited, regardless of the iron amount. The iron nanostructures are useless for ORR catalysis and can be removed by acid leaching. ,, Although we did not perform this dissolution process during this material study, this step should certainly be considered for the integration of these materials in functional fuel cells to avoid potential side effects such as long-term dissolution.…”

Section: Resultsmentioning

confidence: 99%

“…The microstructure of carbon cryogels is expected to change with the pH. This could give access to the optimization of the specific surface area. , To this goal, the diphasic materials formed in a specific pH range were further characterized.…”

Section: Resultsmentioning

confidence: 99%

“…This kind of material has been very recently studied and the impact of many parameters on the formation of active sites is still to be comprehensively understood . Among them, the pH at the beginning of the polymerization reaction and the loading of iron before the heat treatment step seem crucial for the formation of active sites in a suitable porous network. , Moreover, in this method, iron is used both as a precursor of the active site and as a catalyst of the graphitization of carbon. , This dual role of iron is of interest to understand the formation of active sites …”

Section: Introductionmentioning

confidence: 99%

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Structure–Property Relationship of Cryogel-Based Fe–N–C Catalysts for the Oxygen Reduction Reaction

et al. 2021

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As part of the cost reduction of proton exchange membrane fuel cells, the substitution of the standard platinum catalyst by iron active sites for the oxygen reduction reaction (ORR) appears as a promising route. Herein, we report Pt-free catalysts prepared through an Fe–N-doped carbon cryogel synthesis process. By tuning selected parameters such as the initial pH and precursor molar ratios, various new structures with different chemical compositions and catalytic activities were synthesized and characterized. Carbon cryogels are porous materials, and the achieved hierarchical structures proved favorable for the accessibility of the active sites for O2 and H+. The value of the pH medium was identified as a key parameter to control the structure of N-rich carbon cryogels, leading to a specific pH range to diphasic hydrogels. These materials are described and characterized for the first time, and they show promising catalytic activity for the ORR.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure–Property Relationship of Cryogel-Based Fe–N–C Catalysts for the Oxygen Reduction Reaction

et al. 2021

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“…In addition, transition metals also have been reported to contribute to the incorporation of nitrogen atom into the carbon lattice, forming highly reactive C–N structures serve to ORR. 14,15…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrocatalytic performance of N-doped carbon xerogels obtained through dual nitrogen doping for the oxygen reduction reaction

et al. 2022

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“…The carbon structure has a strong influence on the anchoring effect of metal and auxiliary atoms on its surface, which is crucial in providing fixed reaction sites for the reactants . Various types of carbons, such as carbon black, multiwall carbon nanotubes (MWCNTs), activated carbon, C/polymer composite, and graphene, have been identified as key potential catalyst support materials in fuel cells. The use of carbon nanostructures was shown to significantly increase the current density, durability, and stability of the electrode due to the increase in the specific surface area and a strong anchoring effect.…”

Section: Introductionmentioning

confidence: 99%

Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

et al. 2019

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Summary Reduced graphene oxide (RGO) has progressed as one of key emerging carbon for catalyst support material. As an alternative to the conventional RGO precursor, biomass Sengon wood was converted into RGO for use as a noble metal free catalyst support in oxygen reduction reaction (ORR). This work intends to reveal the applicability of Sengon wood‐derived RGO in anchoring/doping iron and nitrogen particles onto its surface and to study its ORR performance in a half‐cell environment. Thin‐sheet layer and highly defective (ID/IG) was gradually obtained at elevated pyrolysis temperature of Sengon wood graphene oxide (GO) at range 700°C to 900°C. As prepared RGO was further doped into catalyst (Fe/N/RGO) through the same pyrolysis procedure at a selected temperature after mixing the GO powder with iron chloride and different nitrogen precursors (urea, choline chloride, and polyaniline) at a fixed ratio. The ORR activity reached a current density up to 2.43 mA/cm2, which in conjunction with smooth multilayer sheet morphology and high graphitic‐N content as the active sites. Stability analysis indicated an 85% current efficiency and only 0.03 V reduction in onset potential on methanol resistant test for Fe/ChoCl/RGO catalyst. This study revealed that Sengon wood‐derived RGO successfully supported Fe‐N‐C catalyst which showed comparable oxygen reduction activity to Pt/C.

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Effect of carbon precursor and initial pH on cobalt-doped carbon xerogel for oxygen reduction

Cited by 17 publications

References 31 publications

Structure–Property Relationship of Cryogel-Based Fe–N–C Catalysts for the Oxygen Reduction Reaction

Structure–Property Relationship of Cryogel-Based Fe–N–C Catalysts for the Oxygen Reduction Reaction

Enhanced electrocatalytic performance of N-doped carbon xerogels obtained through dual nitrogen doping for the oxygen reduction reaction

Noble‐free oxygen reduction reaction catalyst supported on Sengon wood ( Paraserianthes falcataria L. ) derived reduced graphene oxide for fuel cell application

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