Alkaline earth metal based single atom catalyst for the highly durable oxygen reduction reaction

Bisen, Omeshwari Yadorao

doi:10.1016/j.apmt.2020.100846

Cited by 20 publications

(30 citation statements)

References 44 publications

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“…In contrast to this, the methanol tolerance study on Pt–C clearly indicates the oxidation of methanol as soon as it is introduced into the aqueous electrolyte solution during experimental study (Figure S13). Overall, the present study suggests that the electrochemical oxygen reduction on NFCC is much more favorable than various recently reported state-of-the-art electrocatalysts based on nanocarbon and transition-metal composites. − A comparison between the ORR activity on our best-performing NFCC with a variety of non-precious-metal-based electrocatalysts, recently reported in the literature, is summarized in Table S5.…”

Section: Resultsmentioning

confidence: 52%

Atomic Arrangement Modulation in CoFe Nanoparticles Encapsulated in N-Doped Carbon Nanostructures for Efficient Oxygen Reduction Reaction

Nandan

Pandey

Gautam

et al. 2021

ACS Appl. Mater. Interfaces

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The properties and, hence, the application of materials are dependent on the way their constituent atoms are arranged. Here, we report a facile approach to produce body-centered cubic (bcc) and face-centered cubic (fcc) phases of bimetallic FeCo crystalline nanoparticles embedded into nitrogen-doped carbon nanotubes (NCNTs) with equal loading and almost similar particle size for both crystalline phases by a rational selection of precursors. The two electrocatalysts with similar composition but different crystalline structures of the encapsulated nanoparticles have allowed us, for the first time, to account for the effect of crystal structure on the overall work function of electrocatalysts and the concomitant correlation with the oxygen reduction reaction (ORR). This study unveils that the electrocatalysts with lower work function show lower activation energy to facilitate the ORR. Importantly, the difference between the ORR activation energy on electrocatalysts and their respective work functions are found to be identical (∼0.2 eV). A notable decrease in the ORR activity after acid treatment indicates the significant role of encapsulated FeCo nanoparticles in influencing the oxygen electrochemistry by modulating the material property of overall electrocatalysts.

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Section: Resultsmentioning

confidence: 52%

Atomic Arrangement Modulation in CoFe Nanoparticles Encapsulated in N-Doped Carbon Nanostructures for Efficient Oxygen Reduction Reaction

Nandan

Pandey

Gautam

et al. 2021

ACS Appl. Mater. Interfaces

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“…32 The N 1s spectrum of Ru@NC_800 as shown in Figure 1c demonstrates the presence of pyridinic N (∼398.2 eV), pyrrolic N (∼399.5 eV), graphitic N (∼400.9 eV), and some oxygenated nitrogen functionalities (∼402.8 eV). 16,28,33,34 Figure S2 shows the N 1s HRXPS spectra of Ru@NC_700 and Ru@NC_900. Careful analysis of N 1s spectra reveals that the atomic % of graphitic N in Ru@ NC_800 (∼ 38.57 at.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Furthermore, the figures of merit such as the number (n) of electron transfer and corresponding HO 2 − generation are employed for evaluating the effectiveness of ORR electrocatalysts. n and %HO 2 − per oxygen molecule during ORR are evaluated from ORR RRDE polarization curves using the following equations, 16 n I I 4…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Pt-based catalysts are widely used for ORR owing to their low overpotential and excellent current density. 16 However, its low abundance and high expenses hinder the large-scale applicability. 17,18 At the crux of electrochemical energy conversion devices, the major challenge is to develop a highly active, Pt-free, economically viable and stable oxygen electrocatalyst.…”

Section: ■ Introductionmentioning

confidence: 99%

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Uniform Distribution of Ruthenium Nanoparticles on Nitrogen-Doped Carbon Nanostructure for Oxygen Reduction Reaction

Bisen

2021

ACS Appl. Energy Mater.

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Highly efficient, durable, and economically viable electrocatalysts for oxygen reduction reaction (ORR) is central for energy conversion and storage devices such as fuel cells and metal–air batteries. Despite of the enormous recent achievements, it is challenging to achieve satisfactory activity and stability at the same time due to lack of fundamental understanding on the activity governing factors. Here, we demonstrate the mechanistic insight of oxygen reduction on the uniformly dispersed Ru nanoparticles on N-doped carbon support (Ru@NC). The promotion of energy efficient inner-sphere electron transfer mechanism with reduced HO2 – generation demonstrates as the crucial descriptor for appreciable activity and remarkable stability. In terms of the mass activity, the developed catalyst outperforms other previously reported state-of-the-art catalysts. The greatly suppressed HO2 – generation endows remarkable stability (∼6 mV of negative shift in half-wave potential and only 1.9% reduction of activity at 0.9 V after 10000 potential cycles) in alkaline medium. Overall, Ru@NC exhibits remarkably superior stability which is much better than the limit fixed by the U.S. Department of Energy (DOE) and surpasses the state-of-the-art Pt/C catalyst.

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“…[29][30][31] Reports suggest that metal-nitrogen coordination (M-N x ) centers are highly beneficial for ORR and HER. [32][33][34][35][36][37] Transition metal nanoparticles supported on N-doped carbon have been extensively studied for HER. [38][39][40] Metal nanoparticles optimize the surface states of M-N x thereby reducing the energy barrier for water dissociation.…”

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confidence: 99%

Design of Hierarchical Oxide‐Carbon Nanostructures for Trifunctional Electrocatalytic Applications

Devi

Bisen

Cao

et al. 2022

Adv Materials Inter

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The rational design of efficient trifunctional catalysts for oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) is of significant importance for metal–air batteries and electrolyzers. Herein, a hierarchical carbon architecture that comprises of 1D tubes and 2D sheets supported on Ni–Co oxide is synthesized. The 1D–2D carbon nanostructures further support homogeneously dispersed Co/Ni–Nx centers, NiCo and its oxide nanoparticles that are beneficial for ORR, HER, and OER, respectively. The hierarchical nanostructures offer highly exposed surface that enables the maximum utility of active sites for different reactions and also provide a single platform that can be used as OER–ORR and OER‐HER bifunctional catalyst for metal– air batteries and electrolyzers, respectively. The catalyst displays a low ΔE (EJ(OER) = 10 − E½(ORR)) of 0.846 V for bifunctional OER–ORR and low potential of 1.54 V at 10 mA cm−2 for overall water splitting with appreciable durability for 40 h. Overall, the nanostructures exhibit remarkable activity and are durable for OER, ORR, and HER. Moreover, the study offers a pathway to expand the functionality of the non‐noble electrocatalyst and simultaneously offers a platform to prove that preferential active sites exist for different reactions.

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Alkaline earth metal based single atom catalyst for the highly durable oxygen reduction reaction

Cited by 20 publications

References 44 publications

Atomic Arrangement Modulation in CoFe Nanoparticles Encapsulated in N-Doped Carbon Nanostructures for Efficient Oxygen Reduction Reaction

Atomic Arrangement Modulation in CoFe Nanoparticles Encapsulated in N-Doped Carbon Nanostructures for Efficient Oxygen Reduction Reaction

Uniform Distribution of Ruthenium Nanoparticles on Nitrogen-Doped Carbon Nanostructure for Oxygen Reduction Reaction

Design of Hierarchical Oxide‐Carbon Nanostructures for Trifunctional Electrocatalytic Applications

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