Recent Progress on Durable Metal‐N‐C Catalysts for Proton Exchange Membrane Fuel Cells

Wu, Hao‐Ran; Chen, Miao‐Ying; Li, Wei‐Dong; Lu, Bang‐An

doi:10.1002/asia.202300862

Cited by 3 publications

(1 citation statement)

References 97 publications

(228 reference statements)

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“…The X-ray photoelectron spectroscopy (XPS) full-spectrum showed distinct signals assigned to elements C, N, and O of catalysts (Figure f). The N 1s spectrum of N/C can be divided into 4 peaks, namely, pyridine-N (398.4 eV), pyrrolic-N (400.8 eV), graphitic-N (401.8 eV), and N–O (403.9 eV). − Notably, in the Fe/Mo–N/C, Fe–N/C, and Mo–N/C spectra, the additional pinnacle at 399.6 eV can be attributed to metal-N coordination similar to a porphyrin structure, , and it is speculated that the coordination structure of Fe/Mo–N/C is Fe–N 4 /Mo–N 4 (Figure g) . The 8.35–16.22% oxygen-rich group could be attributed to the strong oxidation of the catalyst during the pickling process (Table S1).…”

Section: Synthesis and Characterization Of The Fe/mo–n/c Catalystsmentioning

confidence: 99%

Electrocatalytic Generation of Singlet Oxygen via ROS-Mediated Redox Chain Reaction for Efficient Disinfection

Shi,

Wu,

Duan

et al. 2024

Nano Lett.

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The risk of harmful microorganisms to ecosystems and human health has stimulated exploration of singlet oxygen ( 1 O 2 )-based disinfection. It can be potentially generated via an electrocatalytic process, but is limited by the low production yield and unclear intermediate-mediated mechanism. Herein, we designed a two-site catalyst (Fe/ Mo−N/C) for the selective 1 O 2 generation. The Mo sites enhance the generation of 1 O 2 precursors (H 2 O 2 ), accompanied by the generation of intermediate • HO 2 / • O 2 − . The Fe site facilitates activation of H 2 O 2 into • OH, which accelerates the • HO 2 / • O 2− into 1 O 2 . A possible mechanism for promoting 1 O 2 production through the ROS-mediated chain reaction is reported. The as-developed electrochemical disinfection system can kill 1 × 10 7 CFU mL −1 of E. coli within 8 min, leading to cell membrane damage and DNA degradation. It can be effectively applied for the disinfection of medical wastewater. This work provides a general strategy for promoting the production of 1 O 2 through electrocatalysis and for efficient electrochemical disinfection.

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Section: Synthesis and Characterization Of The Fe/mo–n/c Catalystsmentioning

confidence: 99%

Electrocatalytic Generation of Singlet Oxygen via ROS-Mediated Redox Chain Reaction for Efficient Disinfection

Shi,

Wu,

Duan

et al. 2024

Nano Lett.

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Strong Electronic Metal–Support Interactions Enable the Increased Spin State of Co–N₄ Active Sites and Performance for Acidic Oxygen Reduction Reaction

Chen,

Yin,

et al. 2024

ACS Nano

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Nonprecious metal catalysts, particularly M–N–C catalysts, are widely recognized as promising contenders for the oxygen reduction reaction (ORR). However, a notable performance gap persists between M–N–C catalysts and Pt-based catalysts under acidic conditions. In this study, hybrid catalysts comprising single Co atoms and ultralow concentrations of Pt3Co intermetallic nanoparticles (NPs) are introduced to enhance ORR performance. Under acidic conditions, these hybrid catalysts demonstrate ORR efficiency with a half-wave potential of 0.895 V, negligible decay even after 80 000 cycles, and a high maximum power density of 1.34 W cm–2 in fuel cells. This performance surpasses those of Co–N–C and Pt/Co–N–C catalysts. Both experimental findings and theoretical computations suggest that the heightened ORR activity stems from an increase in the spin density of Co sites induced by noble metal NPs, facilitating the activation of O–O bonds via side-on overlapping and enabling a transition in the reaction pathway from associative to dissociative processes. This research offers a promising avenue for the systematic design of M–N–C cathodes with an enhanced performance for acidic fuel cells.

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Effect of N-Doped Carbon on the Morphology and Oxygen Reduction Reaction (ORR) Activity of a Xerogel-Derived Mn(II)O Electrocatalyst

Peera,

Koutavarapu,

Prasada Reddy

et al. 2024

Catalysts

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This work synthesizes a xerogel from a sol–gel synthesis strategy and supports it on N-doped carbon support from spent coffee biomass (Mn(II)O/N-CC, hereafter MnO) as an efficient oxygen reduction reaction (ORR) catalyst in alkaline electrolytes. The effects of N-CC carbon content on MnO nanoparticle size, dispersion, distribution, morphology, and electrochemistry on ORR are discussed. The SEM and TEM measurements show that increasing the N-CC content during the MnO gelation reaction improved MnO dispersion and particle size during thermal treatment, increasing the ORR’s electrochemical active surface area. Several physiochemical and electrochemical characterizations show a clear relationship between N-CC catalysts and ORR activities. The best catalyst, MnO/N-CC-5, had an even distribution of 27 nm MnO nanoparticles on the N-CC support. The MnO/N-CC-5 catalyst had almost identical ORR kinetics and stability to those of the state-of-the-art Pt/C catalyst in 0.1 M KOH electrolytes, losing only 10 mV in half-wave potential after 5000 potential cycles and retaining 96% of current for over 10 h of continuous chronoamperometric stability. By measuring the electrochemical active surface areas of various catalysts by cyclic voltammetry at different scan rates and measuring the double layer capacitance (Cdl) and ECSA, MnO/N-CC-5 catalysts were shown to have enhanced ORR activity. The XPS analysis explains the ORR activity in terms of the Mn3+/Mn4+ ratio, and a mechanism was proposed. These findings suggest that the MnO/N-CC-5 catalyst could be a cathode catalyst in fuel cells, biofuel cells, metal–air batteries, and other energy conversion devices.

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Recent Progress on Durable Metal‐N‐C Catalysts for Proton Exchange Membrane Fuel Cells

Cited by 3 publications

References 97 publications

Electrocatalytic Generation of Singlet Oxygen via ROS-Mediated Redox Chain Reaction for Efficient Disinfection

Electrocatalytic Generation of Singlet Oxygen via ROS-Mediated Redox Chain Reaction for Efficient Disinfection

Strong Electronic Metal–Support Interactions Enable the Increased Spin State of Co–N₄ Active Sites and Performance for Acidic Oxygen Reduction Reaction

Effect of N-Doped Carbon on the Morphology and Oxygen Reduction Reaction (ORR) Activity of a Xerogel-Derived Mn(II)O Electrocatalyst

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Recent Progress on Durable Metal‐N‐C Catalysts for Proton Exchange Membrane Fuel Cells

Cited by 3 publications

References 97 publications

Electrocatalytic Generation of Singlet Oxygen via ROS-Mediated Redox Chain Reaction for Efficient Disinfection

Electrocatalytic Generation of Singlet Oxygen via ROS-Mediated Redox Chain Reaction for Efficient Disinfection

Strong Electronic Metal–Support Interactions Enable the Increased Spin State of Co–N4 Active Sites and Performance for Acidic Oxygen Reduction Reaction

Effect of N-Doped Carbon on the Morphology and Oxygen Reduction Reaction (ORR) Activity of a Xerogel-Derived Mn(II)O Electrocatalyst

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Product

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Strong Electronic Metal–Support Interactions Enable the Increased Spin State of Co–N₄ Active Sites and Performance for Acidic Oxygen Reduction Reaction