Current Advances and Applications of Fuel Cell Technologies

Saikia, Kaustav; Kakati, Biraj Kumar; Boro, Bibha; Verma, Anil

doi:10.1007/978-981-13-1307-3_13

Cited by 19 publications

(10 citation statements)

References 195 publications

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Section: Introductionmentioning

confidence: 99%

“…Fuel cells are a well-established clean energy conversion technology, efficiently converting the chemical energy contained in a fuel (usually H 2 ) into electrical energy without locally releasing poisonous chemicals or greenhouse gases. 1 The most common low-temperature technology relies upon a proton exchange membrane (PEMFC) and has seen recent commercial implementation in the transportation sector. 2 A younger technology, the anion-exchange-membrane fuel cell (AEMFC) is receiving growing attention due to potential advantages, including a wider range of oxygen reduction catalyst options involving inexpensive (potentially more sustainable) elements, a wider choice of cheaper and more easily fabricated cell and stack components, and less expensive polymer electrolyte options.…”

Section: Introductionmentioning

confidence: 99%

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CeO₂ Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells

et al. 2022

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This study reports the preparation, characterization, and electrocatalytic properties of palladium-based catalysts containing ceria (CeO 2 ) on carbon black (CB) and onion-like carbon (OLC) supports. The electrocatalysts (Pd− CeO 2 /CB and Pd−CeO 2 /OLC) exhibit a large specific surface area, pore volume, and small particle size, as well as enhanced interfacial interaction and synergy among Pd, CeO 2 , and OLC in Pd−CeO 2 /OLC that are valuable for improved electrocatalysis. The presence of CeO 2 in Pd−CeO 2 /OLC induces ca. 7% defects and modifies the electronic structure of the Pd/OLC interface, significantly improving the electrical conductivity due to enhanced charge redistribution, corroborated by density functional theory (DFT) calculations. Pd−CeO 2 /OLC displays the lowest adsorption energies (H*, OH*, and OOH*) among the series. For the hydrogen oxidation reaction (HOR), Pd−CeO 2 /OLC delivers significantly enhanced HOR (mass-specific) activities of 4.2 (8.1), 13.2 (29.6), and 15 (78.5) times more than Pd−CeO 2 /CB, Pd/OLC, and Pd/CB, respectively, with the best diffusion coefficient (D) and heterogeneous rate constant (k). Pd−CeO 2 /OLC also displays less degradation during accelerated durability testing. In an anion-exchange-membrane fuel cell (AEMFC) with H 2 fuel, Pd−CeO 2 /OLC achieved the highest peak power density of 1.0 W cm −2 at 3.0 A cm −2 as compared to Pd−CeO 2 /CB (0.9 W cm −2 at 2.2 A cm −2 ), Pd/OLC (0.6 W cm −2 at 1.7 A cm −2 ), and Pd/CB (0.05 W cm −2 at 0.1 A cm −2 ). These results indicate that Pd−CeO 2 /OLC promises to serve as a high-performing and durable anode material for AEMFCs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CeO₂ Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells

et al. 2022

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“…In fuel cells, the cathode receives oxidants (often oxygen), and the anode receives reductants, such as some organic molecules [ 33 , 34 ]. The ORR is the half reaction in the oxidization of the reductant by O 2 .…”

Section: Resultsmentioning

confidence: 99%

Bridging oxidase catalysis and oxygen reduction electrocatalysis by model single-atom catalysts

Gao

Han

et al. 2022

National Science Review

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Nanocatalysts with enzyme-like catalytic activities, such as oxidase mimics, are extensively used in biomedicine and environmental treatment. Searching for enzyme-like nanomaterials, clarifying the origins of the catalytic activity and developing activity assessment methodologies are therefore of great significance. Here, we report that oxidase catalysis and oxygen reduction reaction (ORR) electrocatalysis can be well bridged based on their identical activity origins, which makes facile electrocatalytic ORR activity measurements intrinsically applicable to oxidase-like activity evaluations. Inspired by natural heme-copper oxidases, Cu/Fe-doped single-atom catalysts (SACs) were first synthesized and used as model catalysts. Chromogenic reactions, electrochemical voltammetric measurements and density functional theory calculations further verify the linear relationship between the oxidase-like and ORR catalytic activities of the catalysts; thus, an effective descriptor ($| {\overline {{j_{\rm{n}}}} } |$) is proposed for rapid enzymatic catalyst evaluation. The enhanced tumour therapeutic efficacy of SACs has been evidenced to result from their oxidase-like/ORR activities, which proves that numerous ORR electrocatalysts are promising candidates for oxidase mimics and tumour therapy. The synergistic catalytic effect of the biomimetic heterobinuclear Cu-Fe centres has also been thoroughly probed.

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“…In fuel cells, the cathode receives oxidants (often oxygen), and the anode receives reductants, such as some organics. [29,30] The ORR is the half-reaction in the oxidization of reductant by O2. From a chemical reaction viewpoint, if the ORR activity of the catalyst is elevated, its capacity for catalysing organic oxidation by O2 would be enhanced under the same reaction conditions, especially when the rate-determining steps (RDSs) are in the processes of desorption and adsorption of O2.…”

Section: Resultsmentioning

confidence: 99%

Bridging Oxidase- and Oxygen Reduction Electro-Catalysis by Model Single-Atom Catalysts

Lu¹,

Gao²,

Lin³

et al. 2021

Preprint

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Nanocatalysts with enzyme-like catalytic activities, such as oxidase-mimics, are extensively used in biomedicine and environmental treatment. Searching enzyme-like nanomaterials, clarifying the origins of catalytic activity and developing <a></a><a>activity assessment</a> methodologies are therefore of great significance. Here we report that the oxidase- and oxygen reduction reaction (ORR) electro-catalysis can be well-bridged based on their identical activity origins, which makes the facile electrocatalytic ORR activity measurements intrinsically applicable to the oxidase-like activity evaluations. Inspired by natural heme-copper oxidases, Cu/Fe doped <a>single-atom </a><a>catalysts</a> (SACs) were first synthesized and used as model <a>catalysts</a>. Chromogenic reactions, electrochemical voltammetric measurements and <a></a><a>density functional theory</a> calculations further verify <a>the </a>linear relationship between their oxidase-like and ORR catalytic activities of the catalysts, thus an effective descriptor () are proposed for the rapid enzymic catalyst evaluation. <a>The enhanced tumour therapeutic efficacy</a> of SACs has been evidenced to result from their oxidase-like/ORR activities, which prove that numerous ORR electrocatalysts are promising candidates for oxidase mimics and tumour therapy. The synergistic catalytic effect of the biomimetic hetero-binuclear Cu-Fe centres has also been probed thoroughly.

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Current Advances and Applications of Fuel Cell Technologies

Cited by 19 publications

References 195 publications

CeO₂ Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells

CeO₂ Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells

Bridging oxidase catalysis and oxygen reduction electrocatalysis by model single-atom catalysts

Bridging Oxidase- and Oxygen Reduction Electro-Catalysis by Model Single-Atom Catalysts

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Current Advances and Applications of Fuel Cell Technologies

Cited by 19 publications

References 195 publications

CeO2 Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells

CeO2 Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells

Bridging oxidase catalysis and oxygen reduction electrocatalysis by model single-atom catalysts

Bridging Oxidase- and Oxygen Reduction Electro-Catalysis by Model Single-Atom Catalysts

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Product

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CeO₂ Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells

CeO₂ Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells