Synergistic coupling of Co4N/VN confined in N-doped carbon derived from zeolitic imidazolate frameworks for oxygen reduction reaction

Zhang, Jie; Chen, Jinwei; Luo, Yan; Chen, Yihan; Li, Zhenjie; Shi, Junjie; Wang, Gang; Wang, Ruilin

doi:10.1016/j.carbon.2019.12.027

Cited by 39 publications

(24 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 21 ] The N 1s spectrum for 3DOM Fe/Co@NC‐WO 2− x was deconvoluted to four peaks located at 397.8, 398.4, 400.6, and 401.8 eV (Figure 4b ), which corresponds to metal‐N, pyridinic‐N, graphite‐N, and oxidized‐N, respectively. [ 22 ] The percentage for oxidized‐N, graphite‐N, pyridinic‐N, and metal‐N are 24.8%, 24.97%, 28.46%, and 21.77%, respectively (Table S2 , Supporting Information). Pyridinic‐N is beneficial for the formation of 4‐electron pathway with water as products and can reduces the generation of H 2 O 2 , and graphite‐N facilitates electron transfer from the carbon electronic bands to the antibonding orbitals of oxygen, thus contributing to the catalytic performance of ORR.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc‐Air Battery

et al. 2021

View full text Add to dashboard Cite

Rational design of metal oxide supported non-precious metals is essential for the development of stable and high-efficiency oxygen reduction reaction (ORR) electrocatalysts. Here, an efficient ORR catalyst consisting of binary Fe/Co nanoclusters supported by defective tungsten oxide and embedded N-doped carbon layer (NC) with a 3D ordered macroporous architecture (3DOM Fe/Co@NC-WO 2−x ) is developed. The oxygen deficient 3DOM WO 2−x not only serves as a porous and stable support, but also enhances the conductivity and ensures good dispersion of the binary Fe/Co nanocluster, benefiting its ORR catalytic activity. Theoretical calculation shows that there exists a synergistic effect of electron transfer from Fe to Co in the supported binary Fe/Co cluster, promoting the ORR reaction energetics. Accordingly, the 3DOM Fe/Co@NC-WO 2−x catalyst exhibits excellent ORR activity in alkaline medium with a half wave potential (E 1/2 ) of 0.87 V higher than that of Pt/C (0.85 V). The zinc-air batteries assembled by 3DOM Fe/Co@NC-WO 2−x cathode deliver a higher power density and specific capacity than that of Pt/C. A new strategy of combining synergistic binary-metal nanoclusters and conductive metal oxide support design is provided here to develop efficient and durable ORR electrocatalyst.

show abstract

Section: Resultsmentioning

confidence: 99%

Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc‐Air Battery

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The peaks at 397.0, 398.3, 399.7, and 401.0 eV can be attributed to Mn−N, pyridine nitrogen, pyrrolic nitrogen, and graphitic nitrogen, respectively. 17 20,23,40 The graph of C 1s indicates that N is doped into carbon. The combination of carbon and nitrogen in the catalyst facilitates the transfer of electrons and promotes the rapid progress of the catalytic reaction.…”

Section: Resultsmentioning

confidence: 99%

“…The C 1s peak of N-MnO 2 /NC was divided into four small peaks, which belong to C–C, C–N, C–O, and CO at 284.4, 285.4, 286.6, and 288.6 eV. While the C 1s of MnO 2 /C was divided into three peaks, corresponding to C–C, C–O, and CO at 284.5, 286.3, and 288.2 eV. ,, The graph of C 1s indicates that N is doped into carbon. The combination of carbon and nitrogen in the catalyst facilitates the transfer of electrons and promotes the rapid progress of the catalytic reaction. , Therefore, EIS characterization was devoted to the study of electron conduction behavior of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…This makes it difficult to participate in the reaction as an active site and generally heating to a certain temperature is required to activate lattice oxygen, which is not conducive to remove HCHO at ambient temperature. In the current study, the use of nitrogen-doped metal oxides have been proven to be an effective method to destroy the chemical bonding of metal oxides and further transform their electronic structure, lattice structure, oxygen diffusion characteristics, oxygen vacancy concentration, and oxygen with metal bonding strength. − Yu et al took advantage of different electronegativities of O and N to improve the electrophilicity of surface oxygen and reduce the C–H bond activation energy in methane through N-doped Co 3 O 4 , which had a significant effect on the activation of Co 3 O 4. He et al.…”

Section: Introductionmentioning

confidence: 94%

See 1 more Smart Citation

Surface Lattice Oxygen Activation by Nitrogen-Doped Manganese Dioxide as an Effective and Longevous Catalyst for Indoor HCHO Decomposition

Chen

Tang

Huang

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Oxygen vacancy plays an important role in catalytic oxidation of formaldehyde (HCHO), but the inherent drawback of its thermodynamic instability causes the deactivation of catalysts. Hence, improving the thermodynamic stability of oxygen vacancy is a crux during HCHO oxidation. Here, a novel and simple nitrogen doping of MnO2/C catalyst is designed for HCHO oxidation at room temperature. The surface lattice oxygen of MnO2 will be activated by nitrogen-doping, which acts as active sites for HCHO oxidation and solves the thermodynamic instability issue of oxygen vacancy. Furthermore, carbon is doped with nitrogen to promote electron transfer and accelerate the HCHO oxidation process. Therefore, the catalytic activity and stability of the catalyst can be significantly promoted, which can completely remove ∼1 ppm HCHO in the tank within 3 h, and remains highly active after 5 cycles at room temperature (RH = 55%). In addition, the excellent removal performance over the prepared catalyst is also attributed to abundant surface oxygen species, amorphous crystallinity, and low reduction temperature. In situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) and density functional theory (DFT) calculations reveal the reaction mechanism of HCHO. This strategy provides crucial enlightenment for designing novel Mn-based catalysts for application in the HCHO oxidation field.

show abstract

“…[52,53] The Lewis base that N-doped carbon derived from ZIF-67, can adsorb O 2 molecules owing to the possibility of electron pair donation and hence promoting the ORR. [54,55] Considering its remarkable bifunctional OER/ORR activity, the SSM/Co 4 N/CoNC was performed as the air cathode to explore its performance in rechargeable aqueous ZAB. As shown in Figure 5a, at 10 mA cm −2 , the SSM/Co 4 N/CoNC cathode exhibited a high specific capacity of 773.9 mAh g −1 (based on the consumed Zn), which exceeded the RuO 2 (620.6 mAh g −1 ) and Pt/C (659.0 mAh g −1 ).…”

Section: Resultsmentioning

confidence: 99%

In Situ Anchoring Co–N–C Nanoparticles on Co₄N Nanosheets toward Ultrastable Flexible Self‐Supported Bifunctional Oxygen Electrocatalyst Enables Recyclable Zn–Air Batteries Over 10 000 Cycles and Fast Charging

Liu

Zhao

Wang

et al. 2021

Small

View full text Add to dashboard Cite

the complex processes, low throughput, and high cost. [5][6][7] Among various novel flexible batteries, the aqueous rechargeable flexible Zinc-air battery (ZAB) with a semi-open structure is a promising candidate due to the high energy density of 1086 Wh kg −1 , high power density, low cost, environmentally friendliness, and high safety. [8][9][10][11][12] However, most of the reported ZABs are severely limited by the cycling performance and energy efficiency, resulting from the Zn dendrite formation and sluggish cathodic oxygen reduction/evolution reaction (ORR/OER). [13,14] Moreover, the long charging time of flexible batteries severely hindered their real applications for wearable electronics, and thus fast charging capability has become one of the key requirements. [15] The current application of ZAB is still limited to primary battery commonly applied in small devices such as hearing aids, let alone the fast-charging features. Although significant progress has been achieved on cathodes, developing ideal bifunctional air electrodes that are active for ORR and OER is yet challenging for realizing highperformance flexible ZABs. [16,17] At present, the benchmark catalysts for ORR and OER are Pt-based and Ir/Ru-based composites, respectively. Nevertheless, their single electrocatalytic activity for either ORR or OER, scarcity, high cost, and declining stability limit their Zn-air batteries (ZABs) are very promising for flexible energy storage, but their application is limited to the primary battery. Developing an efficient and non-noble metal cathode toward oxygen reduction/evolution reactions (ORR/ OER) is of great significance for the commercial application of rechargeable ZABs. Herein, a flexible self-supported integrated bifunctional cathode is presented in which the Co-N-C nanoparticles are in situ anchored on Co 4 N nanosheets via a facile and scalable strategy. Benefiting from integrated 3D architecture with adequate active sites, porous structure, high conductivity originating from the metal substrate, and the synergistic effects of Co-N-C and Co 4 N, the cathode exhibits excellent bifunctional activity (low overpotential of 275 mV at 10 mA cm −2 for OER, high half-wave potential of 0.833 V for ORR), and ultralong durability for ORR/OER in the alkaline medium. Impressively, this cathode enables the recyclable aqueous ZABs a record overall lifespan over 10 000 cycles at 20 mA cm −2 , and a superior fast-charging feature at an ultrahigh charging current density of 100 mA cm −2 . Furthermore, such a flexible integrated cathode can be directly used as a self-supported cathode for flexible solid-state ZABs, with excellent reversibility for 300 cycles, demonstrating its feasibility for practical application.

show abstract

Synergistic coupling of Co4N/VN confined in N-doped carbon derived from zeolitic imidazolate frameworks for oxygen reduction reaction

Cited by 39 publications

References 61 publications

Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc‐Air Battery

Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc‐Air Battery

Surface Lattice Oxygen Activation by Nitrogen-Doped Manganese Dioxide as an Effective and Longevous Catalyst for Indoor HCHO Decomposition

In Situ Anchoring Co–N–C Nanoparticles on Co₄N Nanosheets toward Ultrastable Flexible Self‐Supported Bifunctional Oxygen Electrocatalyst Enables Recyclable Zn–Air Batteries Over 10 000 Cycles and Fast Charging

Contact Info

Product

Resources

About

Synergistic coupling of Co4N/VN confined in N-doped carbon derived from zeolitic imidazolate frameworks for oxygen reduction reaction

Cited by 39 publications

References 61 publications

Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc‐Air Battery

Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc‐Air Battery

Surface Lattice Oxygen Activation by Nitrogen-Doped Manganese Dioxide as an Effective and Longevous Catalyst for Indoor HCHO Decomposition

In Situ Anchoring Co–N–C Nanoparticles on Co4N Nanosheets toward Ultrastable Flexible Self‐Supported Bifunctional Oxygen Electrocatalyst Enables Recyclable Zn–Air Batteries Over 10 000 Cycles and Fast Charging

Contact Info

Product

Resources

About

In Situ Anchoring Co–N–C Nanoparticles on Co₄N Nanosheets toward Ultrastable Flexible Self‐Supported Bifunctional Oxygen Electrocatalyst Enables Recyclable Zn–Air Batteries Over 10 000 Cycles and Fast Charging