Ta–TiOx nanoparticles as radical scavengers to improve the durability of Fe–N–C oxygen reduction catalysts

Xie, Hua; Xie, Xiaohong; Hu, Guoxiang; Prabhakaran, Venkateshkumar; Saha, Sayantani; González-López, Lorelis; Phakatkar, Abhijit H.; Hong, Min; Wu, Mei‐Ling; Shahbazian‐Yassar, Reza; Ramani, Vijay; Al-Sheikhly, Mohamad; Jiang, De‐en; Shao, Yuyan; Hu, Liangbing

doi:10.1038/s41560-022-00988-w

Cited by 150 publications

(121 citation statements)

References 46 publications

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“…Iron ions have been criticized for their catalytic effect on the decomposition of H 2 O 2 to ROS . Several research groups have turned their attention to the development of iron-free M–N–C catalysts with acidic ORR activity, of which Co–N–C is the most studied. ,− Shao and co-workers compared the degradation mechanism of Co–N–C and Fe–N–C catalysts by both experiments and theoretical simulations .…”

Section: Strategies For Intrinsic Stability Improvementmentioning

confidence: 99%

Exploring Durable Single-Atom Catalysts for Proton Exchange Membrane Fuel Cells

Wan

Shui

2022

ACS Energy Lett.

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Exploring low-cost, highly active, and durable oxygen reduction catalysts is essential for the widespread use of proton exchange membrane fuel cells. Fe−N−C catalysts with nitrogen-coordinated single-atom (Fe−N x ) active sites are the most promising candidates due to their highest activity in acid media among platinum-group-metal-free catalysts. However, the application of Fe−N−C catalysts in realistic fuel cells is still hindered by the conundrum of insufficient stability. This review focuses on the understanding of the structure−stability relationship of Fe−N−C catalysts, which provides valuable guidance for the rational material design toward improved stability. The most significant achievements in recent years are the discovery of several site-specific degradation mechanisms and the identification of intrinsically stable active sites. The development of Fe-free single-atom catalysts is also discussed as an alternative solution.

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Section: Strategies For Intrinsic Stability Improvementmentioning

confidence: 99%

Exploring Durable Single-Atom Catalysts for Proton Exchange Membrane Fuel Cells

Wan

Shui

2022

ACS Energy Lett.

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“…To explore the effect of NaHCO 3 on ·OH, we have detected the concentration change of ·OH in Ti 3 C 2 T x colloids, during which some necessary measures like applying visible light radiation or raising the temperature are carried out to accelerate the oxidation kinetics . First, EPR measurements have been conducted to demonstrate the capability of NaHCO 3 for scavenging ·OH with DMPO as the spin trap Figure a shows the EPR signals in the absence and presence of NaHCO 3 in which the quartet is attributed to DMPO-·OH, evidencing the presence of ·OH in the Ti 3 C 2 T x colloid.…”

Section: Resultsmentioning

confidence: 99%

“…The binding positions are selected for the Ti 3 C 2 T x (001) surface. Specifically, the adsorption energies of ·OH are obtained from △ E ·OH = E *OH – E slab – ( E H2O – 1/2 E H2 ) …”

Section: Methodsmentioning

confidence: 99%

Stabilizing Ti₃C₂T_x in a Water Medium under Multiple Environmental Conditions by Scavenging Oxidative Free Radicals

Wang

Xie

et al. 2022

Chem. Mater.

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MXene nanosheets have been worthy contenders for various applications owing to their unique physicochemical properties but can be easily oxidized to lose their functional properties, especially in a water medium with unclear oxidation mechanism. Here, we investigate the effect of main free radicals in water on the oxidation of Ti 3 C 2 T x and screen out the corresponding effective scavengers. It is found that •OH is more detrimental to Ti 3 C 2 T x in water, and agents such as NaHCO 3 stabilizing Ti 3 C 2 T x by scavenging •OH have been proved to be effective at 50 °C and under visible light irradiation, extending the storage life of Ti 3 C 2 T x colloids up to 140 days at 5 °C. As a proof of concept, the NaHCO 3 -stablized Ti 3 C 2 T x is superior to the unprotected counterpart for supercapacitors and photocatalytic applications. It is expected that this study provides important insights into enhancing the oxidation resistance of Ti 3 C 2 T x in water and facilitates the application of Ti 3 C 2 T x -based materials under multiple environmental conditions.

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“…S13 †). 28 Chronoamperometry i-t curves (Fig. 3f) recorded at a potential of 1.464 V further evidenced the enhanced stability of N-Co 2 C HS/EC with a high current retention (87.13%) aer 40 000 s. 25 But, only 47.66% of the initial current was retained aer 40 000 s for Pt/C.…”

Section: Electrocatalysis Evaluationmentioning

confidence: 89%

Robust oxygen electrocatalysis enabled by bulk nitrogen-doped hierarchical structure cobalt carbide

Zhang

Cai

et al. 2022

J. Mater. Chem. A

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Ta–TiOx nanoparticles as radical scavengers to improve the durability of Fe–N–C oxygen reduction catalysts

Cited by 150 publications

References 46 publications

Exploring Durable Single-Atom Catalysts for Proton Exchange Membrane Fuel Cells

Exploring Durable Single-Atom Catalysts for Proton Exchange Membrane Fuel Cells

Stabilizing Ti₃C₂T_x in a Water Medium under Multiple Environmental Conditions by Scavenging Oxidative Free Radicals

Robust oxygen electrocatalysis enabled by bulk nitrogen-doped hierarchical structure cobalt carbide

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Ta–TiOx nanoparticles as radical scavengers to improve the durability of Fe–N–C oxygen reduction catalysts

Cited by 150 publications

References 46 publications

Exploring Durable Single-Atom Catalysts for Proton Exchange Membrane Fuel Cells

Exploring Durable Single-Atom Catalysts for Proton Exchange Membrane Fuel Cells

Stabilizing Ti3C2Tx in a Water Medium under Multiple Environmental Conditions by Scavenging Oxidative Free Radicals

Robust oxygen electrocatalysis enabled by bulk nitrogen-doped hierarchical structure cobalt carbide

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Stabilizing Ti₃C₂T_x in a Water Medium under Multiple Environmental Conditions by Scavenging Oxidative Free Radicals