Metal-organic framework-derived core-shell-structured nitrogen-doped CoCx/FeCo@C hybrid supported by reduced graphene oxide sheets as high performance bifunctional electrocatalysts for ORR and OER

Fang, Hengyi; Huang, Taizhong; Sun, Yue; Kang, Baotao; Liang, Dong; Yao, Shuo; Yu, Jiemei; Manandhar, Dinesh; Wu, Si; Lee, Jin Yong; Mao, Shun

doi:10.1016/j.jcat.2019.02.005

Cited by 82 publications

(32 citation statements)

References 65 publications

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“…At the high-resolution N 1s spectrum (Fig. 2d), there are four peaks at 398.4, 399.9, 401.4, and 404.4 eV corresponding to pyridinic-N, pyrrolic-N, graphitic-N, and oxidized-N, respectively [22], suggesting successful doping N into the CNTs and thus ensuring Si@N-doped CNTs with high electronic conductivity [39].…”

Section: Resultsmentioning

confidence: 99%

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Jin

Yang

et al. 2020

Science Bulletin

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Section: Resultsmentioning

confidence: 99%

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Jin

Yang

et al. 2020

Science Bulletin

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“…The value is only a little higher than that of the Pt/C catalyst, and the Tafel slope value of Ag/ZrO 2 /MWCNTs indicates that the mechanism of oxygen reduction with Ag/ZrO 2 /MWCNTs is similar to that of Pt/ C catalyst, and the ORR rate determining step is the protonation process of O 2 . [45,46] It indicates that Ag/ZrO 2 /MWCNTs has a good reaction kinetics for ORR.…”

Section: Resultsmentioning

confidence: 99%

Ag/ZrO₂/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction

et al. 2019

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Although the development of non‐platinum electrocatalysts for oxygen reduction reaction (ORR) has made some satisfactory progress, it is still a challenge to get a non‐platinum catalyst with higher activity and better stability. In this study, a novel non‐platinum catalyst composed of silver (Ag) nanoparticles and zirconia (ZrO2) coated on the multi‐walled carbon nanotubes (MWCNTs) catalyst (denoted as Ag/ZrO2/MWCNTs) is obtained by simple hydrothermal and photochemical methods. This catalyst shows more positive onset potential of 0.97 V (vs RHE), higher limiting current density of 6.4 mA cm−2 and lower H2O2 yield of 3.9 % than that of commercial platinum‐carbon (Pt/C) catalyst (0.93 V, 6.0 mA cm−2 and 4.8 % obtained from our test results). Electrochemical tests also show that ORR follows a four‐electron pathway. Moreover, the long‐term stability and methanol tolerance are also better compared with Pt/C. The results of theoretical calculations and the characterizations reveal that the enhanced ORR performance is attributed to the robust skeleton of MWCNTs benefitting for the uniform growth of ZrO2 and the improved conductivity of the catalyst, and the enhanced ability of Ag for O2 adsorption and OH desorption by the introduction of ZrO2. This work may serve as a reference to design and prepare the composite electrocatalysts with the high ORR performance.

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“…The benchmark Pt/C catalyst is not presented, as its E 1/2 value is strongly impacted by the method of catalyst ink fabrication and electrochemical parameters, which vary from one publication to another. However, it can be stated that ORR performance (represented by E 1/2 ) is positively correlated with BET surface area, except for some examples such as the catalyst reported by Fang et al [ 104 ]. In this case, the catalyst presented a BET surface area of only 68.09 m 2 g −1 but featured the highest half-wave potential in its category (multi-metal catalysts).…”

Section: Discussionmentioning

confidence: 99%

“…A high-performance core–shell-structured N-doped CoCx/FeCo@C/reduced graphene oxide (rGO) hybrid was reported as a new bifunctional catalyst for the ORR and the oxygen evolution reaction (OER) [ 104 ]. The related synthesis was fairly long and involved successive reactions between the different precursors listed in Table 5 as well as the preparation of GO followed by 4-h pyrolysis at 800 °C under Ar.…”

Section: Mof-based Orr Electrocatalystsmentioning

confidence: 99%

Synthesis and Performance of MOF-Based Non-Noble Metal Catalysts for the Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells: A Review

et al. 2020

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Hydrogen is widely regarded as a prime energy carrier for bridging the gap between renewable energy supply and demand. As the energy-generating component of the hydrogen cycle, affordable and reliable fuel cells are of key importance to the growth of the hydrogen economy. However, the use of scarce and costly Pt as an electrocatalyst for the oxygen reduction reaction (ORR) remains an issue to be addressed, and in this regard, metal–organic frameworks (MOFs) are viewed as promising non-noble alternatives because of their self-assembly capability and tunable properties. Herein, recent (2018–2020) works on MOF-based electrocatalysts containing N-doped C, Mn, Fe, Co, multiple metals, and multiple sites are reviewed and summarized with a focus on ORR activity, and the principal physicochemical properties and electrochemical performance of these catalysts realized using rotating electrodes are compared.

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Metal-organic framework-derived core-shell-structured nitrogen-doped CoCx/FeCo@C hybrid supported by reduced graphene oxide sheets as high performance bifunctional electrocatalysts for ORR and OER

Cited by 82 publications

References 65 publications

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Ag/ZrO₂/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction

Synthesis and Performance of MOF-Based Non-Noble Metal Catalysts for the Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells: A Review

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Metal-organic framework-derived core-shell-structured nitrogen-doped CoCx/FeCo@C hybrid supported by reduced graphene oxide sheets as high performance bifunctional electrocatalysts for ORR and OER

Cited by 82 publications

References 65 publications

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Ag/ZrO2/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction

Synthesis and Performance of MOF-Based Non-Noble Metal Catalysts for the Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells: A Review

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Ag/ZrO₂/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction