Unravelling charge-transfer in Pd to pyrrolic-N bond for superior electrocatalytic performance

Sahoo, Lipipuspa; Mondal, Sanjit; Gloskovskii, A.; Chutia, Arunabhiram; Gautam, Ujjal K.

doi:10.1039/d0ta12618g

Cited by 19 publications

(6 citation statements)

References 71 publications

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“…Anion exchange membrane fuel-cells (AEMFCs) have attracted significant interest in comparison to proton exchange membrane fuel-cells where large amounts of Pt (>0.2 g/kW) are required to facilitate the sluggish oxygen reduction reaction (ORR). AEMFCs have several advantages such as a less-corrosive alkaline environment, a reduced fuel-crossover effect, and a high efficiency of less-expensive Pd-based electrocatalysts. − Recently, alloying Pd with transition metals have been shown to further reduce the noble-metal load and simultaneously improve the ORR efficiency. ,,− These metals hybridize with Pd to lower its d -band energy, leading to a favorable binding of ORR intermediates and lowering its overpotential. − …”

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Ultrathin Twisty PdNi Alloy Nanowires as Highly Active ORR Electrocatalysts Exhibiting Morphology-Induced Durability over 200 K Cycles

et al. 2022

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Even though the anion exchange membrane fuel cells have many advantages, the stability of their electrocatalysts for oxygen reduction reaction (ORR) has remained remarkably poor. We report here on the ultrathin twisty PdNi-alloy nanowires (NWs) exhibiting a very low reaction overpotential with an E 1/2 ∼ 0.95 V versus RHE in alkaline media maintained over 200 K cycles, the highest ever recorded for an electrocatalyst. The mass activity of the used NWs is >10 times higher than fresh commercial Pt/C. Therein, Ni improves the Pd d-band center for a more efficient ORR, and its leaching continuously regenerates the surface active sites. The twisty nanowire morphology imparts multiple anchor points on the electrode surface to arrest their detachment or coalescence and extra stability from self-entanglement. The significance of the NW morphology was further confirmed from the high-temperature durability studies. The study demonstrates that tailoring the number of contact points to the electrode-surface may help realize commercial-grade stability in the highly active electrocatalysts.

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confidence: 99%

Ultrathin Twisty PdNi Alloy Nanowires as Highly Active ORR Electrocatalysts Exhibiting Morphology-Induced Durability over 200 K Cycles

et al. 2022

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“…In these cases, the Bader charge analyses are implemented to quantify the corresponding bond strengths. 36 It discloses that, in the upper atomic layers, both X 1 and I 3 obtain the charge donated by Sn 2 . The averaged Δ q of Sn 2 and I 3 are respectively shown in Fig.…”

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confidence: 95%

Are formation and adsorption energies enough to evaluate the stability of surface-passivated tin-based halide perovskites?

et al. 2023

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“…The high-resolution N 1s spectrum of CN-meso (Figure C) shows four peaks related to N pyridinic at 398.2 eV (39%), N pyrrolic at 400.6 eV (45%), N graphitic at 402.8 eV (11%), and N oxide at 405 eV (5%). , The major N-species on the carbon frame is N pyrrolic , which is an N species bonded with two carbon in a five-sided ring; they are commonly located on the edges or vacancies of graphitic carbon. Following the Lewis hard–soft interaction principle, N pyrrolic presents an electron-donor nature (Lewis base) and high charge mobility. , N pyrrolic can also act as a link point between the carbon structure and metal species. , …”

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confidence: 99%

Cerium Oxide Nanoparticles Confined in Doped Mesoporous Carbons: A Strategy to Produce Catalysts for Imine Synthesis

et al. 2023

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A group of (doped N or P) carbons were synthesized using soluble starch as a carbon precursor. Further, ceria nanoparticles (NPs) were confined into these (doped) carbon materials. The obtained solids were characterized by various techniques such as N 2 physisorption, XRD, TEM, SEM, XPS, and XAS. These materials were used as catalysts for the oxidative coupling between benzyl alcohol and aniline as the model reaction. Ceria immobilized on mesoporous-doped carbon shows higher activity than the other materials, benchmark catalysts, and most of the previously reported catalysts. The control of the ceria NP size, the presence of Ce 3+ cations, and an increment in the disorder in the ceria NP structure caused by a support−ceria interaction could increase the number of oxygen vacancies and improve its catalytic performance. CN-meso/CeO 2 was also used as the catalyst for a rich scope of substrates, such as substituted aromatic alcohols, linear alcohols, and different types of amines. The influence of various reaction parameters (substrate content, reaction temperature, and catalyst content) on the activity of this catalyst was also checked.

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Unravelling charge-transfer in Pd to pyrrolic-N bond for superior electrocatalytic performance

Abstract: Fuel-cells require large quantities of Pt for oxygen reduction reaction (ORR) to subvert the activity-loss during prolonged use. Pd can complement Pt in the near future by exhibiting a similar...

Cited by 19 publications

References 71 publications

Ultrathin Twisty PdNi Alloy Nanowires as Highly Active ORR Electrocatalysts Exhibiting Morphology-Induced Durability over 200 K Cycles

Ultrathin Twisty PdNi Alloy Nanowires as Highly Active ORR Electrocatalysts Exhibiting Morphology-Induced Durability over 200 K Cycles

Are formation and adsorption energies enough to evaluate the stability of surface-passivated tin-based halide perovskites?

Cerium Oxide Nanoparticles Confined in Doped Mesoporous Carbons: A Strategy to Produce Catalysts for Imine Synthesis

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