Efficacious nitrogen introduction into MoS2 as bifunctional electrocatalysts for long-life Li-O2 batteries

Fan, Xiaoping; Huang, Youguo; Wang, Shaoyi; Zheng, Fenghua; Tan, Chunlei; Li, Yu; Lu, Xifei; Ma, Zhaoling; Li, Qingyu

doi:10.1016/j.electacta.2020.137653

Cited by 21 publications

(13 citation statements)

References 39 publications

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“…This observation indicates that the electronic structure of Mo for MoS 2 -SnS/PNC is modified after SnS coupling. 12,15,41 This change cannot be the result of difference in electronegativity between Mo and Sn but the tuned crystal structure as confirmed by XRD. 12 The ORR catalytic performance of the developed catalysts was evaluated using the RRDE.…”

Section: Resultsmentioning

confidence: 80%

“…Both pyrrolic-N and pyridinic-N can promote the catalytic activity, with the former showing a higher catalytic activity than the latter. , Moreover, pyridinic-N can improve the onset potential for ORR. , For comparison, MoS 2 /NPC and SnS/NPC were also examined by XPS, and the results are provided in Figure S4. The Mo 3d XPS comparison spectra (Figure S5a) reveal that there is a negative shift (0.53 eV) in the binding energy of Mo 3d 5/2 for MoS 2 -SnS/PNC compared to MoS 2 /PNC (229.70 eV), indicating electron transfer from SnS to Mo. ,, However, as shown in Figure S5b, a little shift in the binding energy can be seen in the Sn 3d XPS spectra between SnS/PNC (495.69 eV for Sn 3d 3/2 and 487.31 eV for Sn 3d 5/2 ) and MoS 2 -SnS/PNC (495.67 eV for Sn 3d 3/2 and 487.24 eV for Sn 3d 5/2 ). This observation indicates that the electronic structure of Mo for MoS 2 -SnS/PNC is modified after SnS coupling. ,, This change cannot be the result of difference in electronegativity between Mo and Sn but the tuned crystal structure as confirmed by XRD …”

Section: Resultsmentioning

confidence: 97%

“…The Tafel plots compared in Figure b show that the developed catalysts have a larger Tafel slope than that of Pt/C, implying relatively slow catalytic kinetics. The enhanced ORR catalytic activity of MoS 2 -SnS/NPC is mainly attributed to the additional catalytic sites of SnS. ,,, The electrochemically active surface area (ECSA) of the catalyst was evaluated using the CV method, and the results are provided in Figure S7. , MoS 2 -SnS/NPC possessed a higher capacitance value, which is proportional to ECSA, than MoS 2 /NPC and SnS/NPC, implying more available catalytic sites for ORR. The ECSA value of Pt/C was also evaluated using the CV method for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…The Mo 3d XPS comparison spectra (Figure S5a) reveal that there is a negative shift (0.53 eV) in the binding energy of Mo 3d 5/2 for MoS 2 -SnS/PNC compared to MoS 2 /PNC (229.70 eV), indicating electron transfer from SnS to Mo. 12,35,41 However, as shown in Figure S5b, a little shift in the binding energy can be seen in the Sn 3d XPS spectra between SnS/ PNC (495.69 eV for Sn 3d 3/2 and 487.31 eV for Sn 3d 5/2 ) and MoS 2 -SnS/PNC (495.67 eV for Sn 3d 3/2 and 487.24 eV for Sn 3d 5/2 ). This observation indicates that the electronic structure of Mo for MoS 2 -SnS/PNC is modified after SnS coupling.…”

Section: Resultsmentioning

confidence: 99%

“…The enhanced ORR catalytic activity of MoS 2 -SnS/NPC is mainly attributed to the additional catalytic sites of SnS. 24,26,28,41 The electrochemically active surface area (ECSA) of the catalyst was evaluated using the CV method, and the results are provided in Figure S7. 35,42 MoS 2 -SnS/NPC possessed a higher capacitance value, which is proportional to ECSA, than MoS 2 / NPC and SnS/NPC, implying more available catalytic sites for ORR.…”

Section: Resultsmentioning

confidence: 99%

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Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS₂ and SnS

Cui

et al. 2021

ACS Appl. Energy Mater.

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Graphene-like molybdenum disulfide (MoS2) with unique catalytic features and chemical/electrochemical stability holds great potential as an oxygen reduction reaction (ORR) catalyst, but the overall weak oxygen adsorption and low electron conductivity limit its catalytic activity. Herein, MoS2 strongly coupled with an oxophilic SnS heterostructure embedded in nitrogen-doped porous carbon sheets (MoS2-SnS/NPC) was developed. The coupled SnS can not only tune the electronic structure but also promote the oxygen molecule adsorption and activation. Moreover, NPC can enhance the electron transfer as well as the structural stability of the MoS2-SnS heterostructure without agglomeration. As expected, MoS2-SnS/NPC exhibited enhanced catalytic activity that is superior to those of MoS2/NPC and SnS/NPC along with good catalytic stability for ORR. As a cathode catalyst, a homemade zinc–air battery driven by MoS2-SnS/NPC showed considerable discharging performance superior to the one driven by a commercial Pt/C catalyst in terms of open-circuit voltage, peak power density, and specific capacity. Furthermore, a MoS2-SnS/NPC-based zinc–air battery displayed a stable charging and discharging voltage gap for 48 h without an expanding trend, suggesting a robust cycling performance and heralding promising application prospects. The rotating ring-disk electrode and in situ electrochemical Raman tests revealed that the ORR underwent a combined 2-electron and 4-electron associative mechanism on MoS2-SnS/NPC, and the improved catalytic activity came from the synergistic effect of MoS2, SnS, S vacancy, and porous carbon sheets. This study provided a heterojunction strategy by coupling oxophilic SnS for boosting ORR electrocatalysis, which can be extended to other cheap transition-metal catalysts for efficient energy conversion.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS₂ and SnS

Cui

et al. 2021

ACS Appl. Energy Mater.

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Homogeneous In‐Plane Lattice Strain Enabling d‐Band Center Modulation and Efficient d–π Interaction for an Ag₂Mo₂O₇ Cathode Catalyst With Ultralong Cycle Life in Li‐O₂ Batteries

Yu,

Zhang,

Zhang

et al. 2024

Advanced Energy Materials

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Although lithium–oxygen batteries (LOBs) hold great promise as future energy storage systems, they are impeded by insulated discharge product Li2O2 and sluggish oxygen reduction reaction/oxygen evolution revolution (ORR/OER) kinetics. The application of a highly efficient cathode catalyst determines the LOBs performance. The d‐band modulation and catalytic kinetics promotion are important concept guidelines for the performance enhancement of cathode catalysts. In this work, the homogeneous in‐plane distortion‐derived synergistic catalytic capability of an Ag2Mo2O7 catalyst with modulated d‐band centers and promoted ORR/OER kinetics is demontrated. The uniform elongation of Ag─O bonds and compression of Mo─O bonds in (020) plane leads to d‐band splitting and d‐band center optimization and delivers improved adsorption behavior for high ORR/OER capability. Furthermore, the spatial and energy overlap of Ag dxz and O2 anti‐bonding π* orbitals facilitate electron injection during ORR process and reduce the energy barrier for charge transfer and O2 desorption during OER process, accelerating the ORR/OER kinetics. As a result, the (020) plane‐exposed Ag2Mo2O7 cathode exhibits ultralong cycle stability of 817 cycles at 500 mA g−1 and large specific discharge/charge capacities of 15898/15180 mAh g−1. This work provides facile concept guidance for optimizing catalytic capability through controlled lattice distortion in cathode catalysts for LOBs.

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Epitaxial Growth of Li₂O₂ Achieved by a Rational Designed Fe₃O₄@N‐doped Carbon Nanoflower Structure for Improving the Performance of Li−O₂ Batteries

Ma,

Lou,

Yao

et al. 2023

ChemNanoMat

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The insulated and insoluble discharge product Li2O2 can cause excessive charge overpotential, eventually leading to the deactivation of the Li‐O2 battery. Here, a nanoflower structure (Fe3O4@NC) fabricated by coating Fe3O4 with N‐doped carbon was used as an effective catalyst for Li‐O2 cathode. The N‐doped defective carbon layer provides sufficient active sites for the formation of discharge intermediates and exhibits a coating effect on Fe3O4, thereby facilitating the maintenance of structural stability. The hierarchical structure of Fe3O4 can effectively mitigate the agglomeration of the carbon layer, thus promoting a homogeneous distribution and optimal utilization of active sites on the carbon layer. As a result, the synergistic effect of Fe3O4 combined with the N‐doped carbon layer enhances the Li+/e‐ transfer rate and effectively accelerates the kinetic of oxygen reduction/ evolution reaction (ORR/OER). Furthermore, the unique functionality of Fe3O4@NC induces the epitaxial growth of Li2O2 into uniform nanosheets, thereby increasing the utilization of cathode space and ultimately promoting the energy release of Li‐O2 batteries. The Li‐O2 battery with Fe3O4@NC cathode exhibits remarkable full discharge capacity of 16495 mAh g‐1 and significantly improved round‐trip performances for 120 cycles at a cutoff capacity of 1000 mAh g‐1 with a current density of 200 mA g‐1.

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Efficacious nitrogen introduction into MoS2 as bifunctional electrocatalysts for long-life Li-O2 batteries

Cited by 21 publications

References 39 publications

Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS₂ and SnS

Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS₂ and SnS

Homogeneous In‐Plane Lattice Strain Enabling d‐Band Center Modulation and Efficient d–π Interaction for an Ag₂Mo₂O₇ Cathode Catalyst With Ultralong Cycle Life in Li‐O₂ Batteries

Epitaxial Growth of Li₂O₂ Achieved by a Rational Designed Fe₃O₄@N‐doped Carbon Nanoflower Structure for Improving the Performance of Li−O₂ Batteries

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Efficacious nitrogen introduction into MoS2 as bifunctional electrocatalysts for long-life Li-O2 batteries

Cited by 21 publications

References 39 publications

Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS2 and SnS

Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS2 and SnS

Homogeneous In‐Plane Lattice Strain Enabling d‐Band Center Modulation and Efficient d–π Interaction for an Ag2Mo2O7 Cathode Catalyst With Ultralong Cycle Life in Li‐O2 Batteries

Epitaxial Growth of Li2O2 Achieved by a Rational Designed Fe3O4@N‐doped Carbon Nanoflower Structure for Improving the Performance of Li−O2 Batteries

Contact Info

Product

Resources

About

Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS₂ and SnS

Oxygen Reduction Reaction Promoted by the Strong Coupling of MoS₂ and SnS

Homogeneous In‐Plane Lattice Strain Enabling d‐Band Center Modulation and Efficient d–π Interaction for an Ag₂Mo₂O₇ Cathode Catalyst With Ultralong Cycle Life in Li‐O₂ Batteries

Epitaxial Growth of Li₂O₂ Achieved by a Rational Designed Fe₃O₄@N‐doped Carbon Nanoflower Structure for Improving the Performance of Li−O₂ Batteries