Graphite nanosheets/nanoporous carbon black/cerium oxide nanoparticles as an electrode material for electrochemical capacitors

Sarpoushi, Mahdi Robat; Nasibi, Mahdi; Shishesaz, Mohammadreza; Golozar, M.A.; Riazi, Hamid

doi:10.1016/j.synthmet.2014.12.031

Cited by 7 publications

(8 citation statements)

References 33 publications

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“…Also, 3D GO, G functionalised with oxygen moieties, achieved a C s of 352 F g À1 at a sweep rate of 5 mV s À1 [117]. A composite of G/CeO 2 /carbon black in electrodes with a narrow deep morphology was reported to increase charge storage but reduced current response [95]. This in turn increased the specific surface area, Faradaic reactions and charge storage capabilities, but reduced the current response and power delivery capabilities.…”

Section: Graphenementioning

confidence: 99%

“…Furthermore, the capacitive behaviour of carbonaceous nanomaterials is structure‐dependent . For example, flake‐ or sheet‐like nanostructures are highly accessible to the electrolyte cations; hence they have increased charge transfer even though they have low specific surface areas . In most cases internal surfaces of nanostructured carbons are inactive in double layer formation.…”

Section: Ecsmentioning

confidence: 99%

“…In most cases internal surfaces of nanostructured carbons are inactive in double layer formation. Various forms of carbon nanostructured materials such as carbon nanofibers, nanorods, G nanosheets and CNTs, amongst others, have been reported as electrodes in EDLCs (Figure ). For instance, CNTs and G are common materials used in enhancing electrode surface accessibility to electrolytes .…”

Section: Ecsmentioning

confidence: 99%

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A review on the use of carbon nanostructured materials in electrochemical capacitors

Mombeshora

Nyamori

2015

Int. J. Energy Res.

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SUMMARYSustainable and renewable energy resources, as well as energy storage systems (ESSs), are amongst the current and critical global requirements. A comparative discussion on batteries, fuel cells and electrochemical capacitors (ECs) is presented. The mechanisms involved in various classes of ECs are also elaborated. Additionally, a historical background highlighting some of the major steps associated with EC development over the years is discussed in this review. In particular, carbon nanostructured materials have high potential in the development of ESSs, and hence this review presents an insight on the current ESSs with a strong bias towards these materials as ECs. The current status of carbon nanomaterials, such as carbon nanotubes, nanofibers, nano-onions, nanorods, fullerenes and graphene nanosheets, in ECs is reviewed. The associated effects of nanostructural parameters, such as pore sizes and specific electro-active areas, amongst others, in terms of energy storage capabilities are also discussed. Typical physicochemical characterisation techniques, which enrich understanding of their characteristics, are also reviewed. The discussion views set platforms for a variety of unique carbon nanomaterial designs with high prospective specific capacitance. Key porosity tailoring protocols, such as chemical activation, introduction of heteroatoms in carbon nanostructures and template synthesis methods, are also reviewed. The effects of other device components, such as electrolyte ion size and solvent system, electrode design and use of binders, to the overall capability of EC, are also discussed.

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Section: Graphenementioning

confidence: 99%

Section: Ecsmentioning

confidence: 99%

Section: Ecsmentioning

confidence: 99%

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A review on the use of carbon nanostructured materials in electrochemical capacitors

Mombeshora

Nyamori

2015

Int. J. Energy Res.

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“…For small‐sized RE‐based nanoparticles, spontaneous aggregation caused by the high surface energy needs to be solved. The combination of small‐sized RE‐based nanoparticles and other electroactive materials is provided as one of the countermeasures [73,74] Chakrabarty. et al.…”

Section: Morphology Controlmentioning

confidence: 99%

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

Zhou

2022

ChemSusChem

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Supercapacitors (SCs) can effectively alleviate problems such as energy shortage and serious greenhouse effect. The properties of electrode materials directly affect the performance of SCs. Rare earth (RE) is known as “modern industrial vitamins”, and their functional materials have been listed as key strategic materials. In the past few years, the number of scientific reports on RE‐based nanomaterials for SCs has increased rapidly, confirming that adding RE elements or compounds to the host electrode materials with various nanostructured morphologies can greatly enhance their electrochemical performance. Although RE‐based nanomaterials have made rapid progress in SCs, there are very few works providing a comprehensive survey of this field. In view of this, a comprehensive overview of RE‐based nanomaterials for SCs is provided here, including the preparation methods, nanostructure engineering, compounds, and composites, along with their capacitance performances. The structure–activity relationships are discussed and highlighted. Meanwhile, the future challenges and perspectives are also pointed out. This Review can not only provide guidance for the further development of SCs but also arouse great interest in RE‐based nanomaterials in other research fields such as electrocatalysis, photovoltaic cells, and lithium batteries.

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“…O filme n-Ag/PAni mostra uma corrente maior do que a amostra PAni, devido à incorporação das nanopartículas de Ag ser mais condutora. Já o perfil da voltametria com a presença de cério, os valores de densidade de corrente são menores quando comparado aos da PAni, indicando que a presença da nanopartícula na matriz polimérica influencia no comportamento eletroativo do polímero condutor 62,86,87 . E por fim, as curvas voltamétricas de n-AgCe/PAni que ao contrário das curvas correspondentes a n-Ag/PAni e n-Ce/PAni de natureza assimétrica, apresentou um perfil mais próximo ao da PAni.…”

Section: Resultados E Discussão Capítulo 3 -Resultados E Discussãounclassified

Proteção de superfícies de ligas de alumínio contra a corrosão utilizando bicamada de recobrimentos à base de nanopartículas e polímero condutor

Oliveira¹

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As superfícies das ligas de alumínio AA6063 e AA7075 foram revestidas por uma única camada contendo nanopartículas (AgCe) e polianilina (PAni), ambas na presença de ácido dodecilbenzenosulfônico (DBSA). Os filmes foram obtidos por deposição casting, a fim de aumentar a capacidade de adesão e dispersão do filme sobre a superfície das ligas. A camada de nanopartículas de AgCe aparece como opção para melhorar a morfologia e textura do revestimento de cério, assim como, minimizar processos corrosivos oferecendo maior utilidade para estes materiais. Espera-se que estas propriedades aumentem a capacidade do filme de PAni em proteger as superfícies metálicas contra a corrosão. Neste trabalho, as amostras foram caracterizadas por difratometria de raios X, espectroscopia no infravermelho, espectroscopia no ultravioleta visível, espectroscopia de fotoelétrons excitada por raios X, microscopia de força atômica, microscopia eletrônica de varredura, espectroscopia de energia dispersiva e microscopia ótica. Testes de corrosão como potencial de circuito aberto, polarização potenciodinâmica e espectroscopia de impedância eletroquímica também foram realizados. Os testes de corrosão mostraram que os valores para o potencial de circuito aberto das ligas AA6063 e AA7075 são mais positivos para as amostras revestidas, ou seja, mais nobres em comparação com as amostras não revestidas. Para os ensaios eletroquímicos de 3h de imersão em NaCl 3,5% os valores do potencial de corrosão (E corr) obtidos na polarização potenciodinâmica foi-0,63 V para AA6063/AgCe/PAni e-0,61 V para AA7075/AgCe/PAni e para as ligas sem revestimento os valores foram em-0,78 V para a liga AA6063 e-0,83 V para a AA7075, o que indicou um deslocamento do potencial para valores mais nobres. Para os ensaios de corrosão com tempos de imersão de 6, 30 e 60h realizados apenas para os revestimentos de PAni e n-AgCe / PAni por apresentarem E corr mais positivos e pela adesão relativamente boa, também indicaram melhor desempenho contra corrosão para o revestimento contendo as nanopartículas mesmo após o tempo máximo de imersão em NaCl 3,5%. Assim, a eficiência de proteção do revestimento n-AgCe/PAni para a liga AA6063 foi de 80% e para a liga AA7075 91%, apresentando maior porcentagem em comparação ao revestimento de PAni, confirmando que o revestimento contendo as nanopartículas/PAni promoveu maior proteção contra corrosão em até 60h de imersão em meio salino. Palavras-chave: Polianilina. Nanopartículas. DBSA. Liga de Alumínio. Corrosão.

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Graphite nanosheets/nanoporous carbon black/cerium oxide nanoparticles as an electrode material for electrochemical capacitors

Cited by 7 publications

References 33 publications

A review on the use of carbon nanostructured materials in electrochemical capacitors

A review on the use of carbon nanostructured materials in electrochemical capacitors

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

Proteção de superfícies de ligas de alumínio contra a corrosão utilizando bicamada de recobrimentos à base de nanopartículas e polímero condutor

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