Optimizing oxygen redox kinetics of M-N-C electrocatalysts via an in-situ self-sacrifice template etching strategy

Yang, Yuan; Wang, Jingwen; Shi, Wenbo; Bai, Xinyi; Li, Ge; Bai, Zhengyu; Yang, Lin

doi:10.1016/j.cclet.2022.107807

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…93 The porous structure is beneficial for increasing the contact area between the catalyst and the aqueous electrolyte, facilitating the exposure of the active sites and faster mass transfer in the electrochemical reaction. Yuan et al 94 used spherical ZnO as a pore former and in situ self-sacrifice template to obtain effective mass transfer FeCo-N-C bimetallic catalysts (Fig. 2(a)).…”

Section: D Fe-based Catalystsmentioning

confidence: 99%

Advanced design strategies for Fe-based metal–organic framework-derived electrocatalysts toward high-performance Zn–air batteries

Guo,

Zhao,

Zhang

et al. 2024

Energy Environ. Sci.

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Section: D Fe-based Catalystsmentioning

confidence: 99%

Advanced design strategies for Fe-based metal–organic framework-derived electrocatalysts toward high-performance Zn–air batteries

Guo,

Zhao,

Zhang

et al. 2024

Energy Environ. Sci.

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“…In Figure S5 (Supporting Information), it was observed a definite increase trend in the value of A D /A G (from Fe/NPC-HT 1 to SA-Fe III /SNPC), implying an increase in the number of defects during secondary pyrolysis and S doping. [39][40][41] X-ray photoelectron spectroscope (XPS) was performed to understand the bonding environment in SA-Fe III /SNPC. The XPS survey spectrum shows the coexistence of C, N, O, S, and Fe elements (Figure S6 and Table S2, Supporting Information).…”

Section: Preparation and Physical Characterizationmentioning

confidence: 99%

Suppressing Thermal Migration by Fine‐Tuned Metal‐Support Interaction of Iron Single‐Atom Catalyst for Efficient ORR

Wang

et al. 2023

Adv Funct Materials

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Atomically dispersed iron–nitrogen–carbon (FeNC) catalysts have sparked great interest by virtue of the highly active isolated FeN4 sites. The catalysts with pyrolysis treatment usually induce inevitable FeN4 sites agglomeration, leading to fast degradation in catalytic activity. Herein, a pre‐coordinated protection strategy is proposed to eliminate the aggregation of Fe atoms by suppressing the thermal migration during the pyrolysis process. To this end, the S atom is introduced into the graphitic support by enhancing the metal‐support interaction. The proposed atomic structure is revealed by multiple advanced characterizations including Fe Mössbauer spectroscopy, X‐ray absorption spectroscopy, and theoretical calculations. By employing S atom into the structure, the center atom Fe is oxidized to a higher valence, improving the bonding energy with the graphitic support, which accordingly endows catalyst anti‐sintering capacity and improved catalytic activity. Compared to commercial Pt/C and the reported catalyst with secondary pyrolysis, the proposed catalysts exhibit enhanced ORR activity in alkaline media (E1/2 = 0.91 V). This work provides a new avenue toward optimizing and improving ORR performance of atomically dispersed Fe catalysts.

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“…The oxygen evolution reaction (OER) is an essential reaction dominating metal-air batteries, [1][2][3][4] water splitting, [5][6][7][8][9] and many other clean energy devices. [10][11][12][13] However, catalysts are crucial for the majority of OER processes owing to sluggish four-electron transfer, [14][15][16][17] making the expensive price of the current noble metal-based catalysts a crucial bottleneck for sustainable chemistry and industrialization.…”

Section: Introductionmentioning

confidence: 99%

Optimizing 3d spin polarization of CoOOH by in situ Mo doping for efficient oxygen evolution reaction

Jia,

Yuan,

Zhang

et al. 2023

Carbon Energy

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Transition‐metal oxyhydroxides are attractive catalysts for oxygen evolution reactions (OERs). Further studies for developing transition‐metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next catalysts. Herein, Mo‐doped CoOOH was designed as a high‐performance model electrocatalyst with durability for 20 h at 10 mA cm−2. Additionally, it had an overpotential of 260 mV (glassy carbon) or 215 mV (nickel foam), which was 78 mV lower than that of IrO2 (338 mV). In situ, Raman spectroscopy revealed the transformation process of CoOOH. Calculations using the density functional theory showed that during OER, doped Mo increased the spin‐up density of states and shrank the spin‐down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process, which simultaneously optimized the adsorption and electron conduction of oxygen‐related intermediates on Co sites and lowered the OER overpotentials. Our research provides new insights into the methodical planning of the creation of transition‐metal oxyhydroxide OER catalysts.

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Optimizing oxygen redox kinetics of M-N-C electrocatalysts via an in-situ self-sacrifice template etching strategy

Cited by 5 publications

References 26 publications

Advanced design strategies for Fe-based metal–organic framework-derived electrocatalysts toward high-performance Zn–air batteries

Advanced design strategies for Fe-based metal–organic framework-derived electrocatalysts toward high-performance Zn–air batteries

Suppressing Thermal Migration by Fine‐Tuned Metal‐Support Interaction of Iron Single‐Atom Catalyst for Efficient ORR

Optimizing 3d spin polarization of CoOOH by in situ Mo doping for efficient oxygen evolution reaction

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