Recent developments of nanocarbon based supports for PEMFCs electrocatalysts

Ou, Zuqiao; Chen, Haixin; Song, Shuqin; Wang, Kun; Wang, Yi

doi:10.1016/s1872-2067(20)63736-6

Cited by 43 publications

(23 citation statements)

References 236 publications

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“…The best-performing sample (Fe 3 O 4 /NPC-50) possesses the most positive onset potential of 0.95 V and the maximum limiting current density of 5.2 mA/cm 2 , which is even better than those of the commercial Pt/C (Figure d). As is known, except for Fe-N coordinations as the widely recognized active sites in Fe-N-C materials, the synergistic effect between Fe-N and Fe 3 C has been demonstrated to further enhance their ORR activities. − Combining the XRD results, the optimized NPC content can cogenerate Fe-N coordination and Fe 3 C as double active sites. Too less NPC content leads to the formation of Fe 3 O 4 with a large particle size, thus lowering the density of Fe-N active sites.…”

Section: Resultsmentioning

confidence: 99%

MOF-Derived Porous Fe-N-C Materials for Efficiently Electrocatalyzing the Oxygen Reduction Reaction

et al. 2022

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Fe-based metal–organic framework (MOF)-derived Fe-N-C materials as non-precious-metal oxygen reduction reaction (ORR) electrocatalysts to replace commercial Pt/C and realize real commercial applications still suffer from poor intrinsic electrical conductivity and part embedding or agglomeration of Fe-N active sites. Herein, we develop conductivity-enhanced MOF-derived porous Fe-N-C material via pyrolyzing Fe-based MOF particles (Fe-MIL-NH2) in situ grown onto as-prepared three-dimensional (3D) nitrogen-doped porous carbon materials (NPCs). Benefiting from the enhanced electrical conductivity, good dispersibility of Fe-N active sites, and rapid mass transfer due to the 3D ordered interconnected NPC framework, the best-performing sample (Fe3O4/NPC-50-900) exhibits an onset potential of 0.96 V (vs reversible hydrogen electrode (RHE)) and a limiting current density of 5.2 mA/cm2 for electrocatalyzing ORR in 0.1 M KOH aqueous solution, which is comparable to that of commercial Pt/C (20 wt %, Johnson Mattey Corp.). Moreover, Fe3O4/NPC-50-900 also exhibits good methanol tolerance and long-term durability. This work provides a feasible strategy to address the issues of poor electrical conductivity and inferior Fe-N active site exposure of Fe-N-C materials derived from Fe-based MOFs, thus accelerating the practical application of MOF-derived materials.

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Section: Resultsmentioning

confidence: 99%

MOF-Derived Porous Fe-N-C Materials for Efficiently Electrocatalyzing the Oxygen Reduction Reaction

et al. 2022

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“…Furthermore, organic sulfur magazines occupying the active sites lead to agglomeration and even a decrease in stability. [ 35 ] Therefore, it is necessary to further adjust the structure and morphology of carbon materials and develop other nanostructured carbon carriers to enhance the efficiency of catalysts.…”

Section: Conventional Carriersmentioning

confidence: 99%

Review and Development of Anode Electrocatalyst Carriers for Direct Methanol Fuel Cell

Chen

Sun

et al. 2022

Energy Tech

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Direct methanol fuel cell (DMFC) can be used as a promising portable power device due to its excellent energy conversion efficiency and low pollutant emissions. The performance of DMFC largely depends on the anode electrocatalyst for methanol oxidation reaction (MOR). As an important part of the electrocatalyst, the carrier greatly affects the activity and stability of the electrocatalyst. Herein, the research progress of carbonaceous carriers (such as activated carbon, nanostructured carbon), noncarbonaceous carriers (metal compounds), and conducting polymers in DMFC is reviewed. Furthermore, an overview of the development of self‐supporting carriers for flexible DMFC electronics is presented. Its role as the most ideal DMFC carrier in the future provides new ideas for the challenges and development of the commercialization of flexible DMFC.

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“…To solve the increasing environmental pollution caused by the usage of fossil fuel, Zn-air batteries and fuel cells as promising renewable clean power sources have attracted extensive interest due to their inherent characteristics of high energy efficiency and CO 2 -free emission. , The oxygen reduction reaction (ORR) plays a predominant role to determine the overall energy conversion efficiency of these devices because it is sluggish in kinetics with a four-electron process, compared with fast Zn oxidation and H 2 oxidation reactions at the anode. , Currently, Pt-based electrocatalysts are commercially available to enhance ORR . However, the high cost originating from the scarcity of Pt resources seriously hinders the large-scale commercial application of these technologies.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 The oxygen reduction reaction (ORR) plays a predominant role to determine the overall energy conversion efficiency of these devices because it is sluggish in kinetics with a four-electron process, compared with fast Zn oxidation and H 2 oxidation reactions at the anode. 3,4 Currently, Pt-based electrocatalysts are commercially available to enhance ORR. 5 However, the high cost originating from the scarcity of Pt resources seriously hinders the largescale commercial application of these technologies.…”

Section: Introductionmentioning

confidence: 99%

In Situ S-Doping Strategy of Promoting Iron Coordinated by Nitrogen-Doped Carbon Nanosheets for Efficient Oxygen Reduction Reaction

Wang

Zhang

Xiang

et al. 2022

ACS Appl. Mater. Interfaces

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Improving transition metal–nitrogen–carbon (M-N-C) as a noble-metal-free catalyst for the oxygen reduction reaction (ORR) is critical to achieve low-cost electrochemical energy conversion. Herein, an in situ S doping strategy of enhancing Fe-N-C activity for ORR was developed by newly designed Fe(II) ion coordinated S-containing bis(imino)-pyridine-based polymers as precursors, which were synthesized through copolymerizing three monomers of 2, 6-diacetylpyridine (DAP), triamterene (TIT), and 2,5-dithiobiurea (DTB) as both N and S sources. All samples derived from various molar ratios of the three monomers possess a self-supporting structure of nanosheets. Additionally, incorporating DTB into the copolymer can not only strongly affect the derived coordinative species of N dopants to Fe atom but also effectively induce the synergistic effect between S dopants and FeNx moieties, resulting a significant improvement for ORR. The S-doped Fe-N-C nansheets with Fe coordinated by 4 pyrrolic N dopants exhibit the highest ORR activity and stability in alkaline media with a higher power output of Zn-air battery than that of the same loading of Pt/C. Theoretical calculation identifies that the thiophenic S dopant adjacent to Fe-pyrrolic N moiety can decrease the d band center of Fe atom, greatly weakening the energy profiles of oxygenated intermediates and thus enhancing ORR. In addition, because of the designability of transition metal coordinated S-containing bis(imino)-pyridine based polymers in the work, therefore, it is believable that this strategy would open a wide space to explore the structural relationship between precursors and MNx active sites with S dopants for the purpose of achieving highly efficient and robust M-N-C catalysts for energy-related electrocatalysis.

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Recent developments of nanocarbon based supports for PEMFCs electrocatalysts

Cited by 43 publications

References 236 publications

MOF-Derived Porous Fe-N-C Materials for Efficiently Electrocatalyzing the Oxygen Reduction Reaction

MOF-Derived Porous Fe-N-C Materials for Efficiently Electrocatalyzing the Oxygen Reduction Reaction

Review and Development of Anode Electrocatalyst Carriers for Direct Methanol Fuel Cell

In Situ S-Doping Strategy of Promoting Iron Coordinated by Nitrogen-Doped Carbon Nanosheets for Efficient Oxygen Reduction Reaction

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