Single-atom oxygen reduction reaction electrocatalysts of Fe, Si, and N co-doped carbon with 3D interconnected mesoporosity

Kim, Hee Soo; Lee, Chi H.; Jang, Jue‐Hyuk; Kang, Min Seok; Jin, Haneul; Lee, Kug‐Seung; Lee, Sang Uck; Yoo, Sung Jong; Yoo, Won Cheol

doi:10.1039/d0ta11208a

Cited by 47 publications

(19 citation statements)

References 58 publications

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“…Hence, the evolution of structural, morphological, chemical and interfacial modifications during pyrolysis must be investigated with state‐of‐the‐art in‐situ and ex‐situ techniques [139] . Furthermore, the single‐atom electrocatalysts (SAECs), owing to their definite structural coordination, outstanding intrinsic activity and highest possible atomic efficiency, are emerging as new frontiers in the field of electrocatalysis and can potentially substitute the PGM‐based electrocatalysts [101,102,140,141] . However, fabrication of SAECs with homogenous and heavily dense active moieties within the carbonaceous framework is still a technical issue.…”

Section: Discussionmentioning

confidence: 99%

Recent Advances in Waste Plastic Transformation into Valuable Platinum‐Group Metal‐Free Electrocatalysts for Oxygen Reduction Reaction

2021

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Plastic waste causes severe environmental hazards, owing to inadequate disposal and limited recycling. Under the framework of circular economy, there are urgent demands to valorize plastic waste more safely and sustainably. Therefore, much scientific interest has been witnessed recently in plastic waste‐derived electrocatalysts for the oxygen reduction reaction (ORR), where the plastic waste acts as a cost‐effective and easily available precursor for the carbon backbone. The ORR is not only a key efficiency indicator for fuel cells and metal–air batteries but also a major obstacle for their commercial realization. The applicability of the aforementioned electrochemical devices is limited, owing to sluggish ORR activity and expensive platinum‐group metal electrocatalysts. However, waste‐derived ORR electrocatalysts are emerging as a potential substitute that could be inexpensively fabricated upon the conversion of plastic waste into active materials containing earth‐abundant transition metals. In this Minireview, very recent research developments regarding plastic waste‐derived ORR electrocatalysts are critically summarized with a prime focus on the followed synthesis routes, physicochemical properties of the derived electrocatalysts, and their ultimate electrochemical performance. Finally, the prospects for the future development of plastic waste‐derived electrocatalysts are discussed.

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Section: Discussionmentioning

confidence: 99%

Recent Advances in Waste Plastic Transformation into Valuable Platinum‐Group Metal‐Free Electrocatalysts for Oxygen Reduction Reaction

2021

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“…Yoo and colleagues recently demonstrated that Si-doped Fe-N-C (FeSiNC) with atomically distributed FeSi x N 4-x active sites exhibited excellent ORR activity and attractive performance as the AEMFCs cathode. 304 In the cell test, FeSiNC cathode presented a maximum power density of 208 mW cm À2 and a current density of 520 mA cm À2 . Theoretical calculations suggested the enhanced ORR activity and high AEMFCs performance arose from Si doping, which not only modified the geometric and electronic structure of Fe active centers, but also activated the catalytic activity of C sites around the Si atoms.…”

Section: Aemfcsmentioning

confidence: 95%

“…Because of the optimized oxygen absorption behavior, the incorporation of F led to a higher ORR catalytic activity and cell performance, surpassing all undoped Fe‐N‐C cathode. Yoo and colleagues recently demonstrated that Si‐doped Fe‐N‐C (FeSiNC) with atomically distributed FeSi x N 4‐x active sites exhibited excellent ORR activity and attractive performance as the AEMFCs cathode 304 . In the cell test, FeSiNC cathode presented a maximum power density of 208 mW cm −2 and a current density of 520 mA cm −2 .…”

Section: Applications In Energy Devicesmentioning

confidence: 99%

“…As a supplement of engineering high-density active sites and porosity to promote the development in AEMFCs, modulating the coordination environment and electronic structure of single metal atoms by heteroatom doping offers predominant superiority in improving their catalytic activity. 303,304 As one of the most representatives, Liu et al fabricated F-doped Fe-N-C and identified the consequent enhancement of catalytic activity and the excellent cathode performance in AEMFCs. 303 F-doped Fe-N-C as a cathode in AEMFC achieved a maximum power density of 104 mW cm À2 and an open-circuit voltage of 0.93 V, nearly tantamount to that of commercial Pt/C (1.0 V).…”

Section: Aemfcsmentioning

confidence: 99%

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Single metal atoms catalysts—Promising candidates for next generation energy storage and conversion devices

Lei

Sathish

Liu

et al. 2022

EcoMat

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Single-metal-atom catalysts (SMACs) with the merits of maximum atom utilization, peculiar electronic structure, and adjustable coordination environment, have emerged as the rising stars. They are not only regarded as the promising electrocatalysts, but also show unconventionally excellent alkali storage, thus enabling them for energy devices. In this work, we review the up-to-date progress of single metal atom catalysts including the detailed synthetic strategies and all sorts of applications in energy storage and conversion. In addition, we also discuss intrinsic catalytic effects, degradation mechanism, modulation approaches, support structure design, current challenges, and potential development trends. This work may shed light on developing high-performance SMACs using a variety of strategies for catalytic and energy applications.

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“…[ 10 ] In recent years, the development of nanomaterials, especially single‐atom catalysts, has provided possible application of non‐PGM catalysts in the AEMFC cathode catalyst layer (CCL). [ 11,12 ] However, the relationship between the catalyst and catalyst layer or membrane electrode assembly (MEA) is still unclear, but this should have a significant influence on the overall performance. In addition to the design of the catalyst and membrane/ionomer materials, the interface between them plays a dominant role in the AEMFC performance.…”

Section: Introductionmentioning

confidence: 99%

Recent Insights on Catalyst Layers for Anion Exchange Membrane Fuel Cells

et al. 2021

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Anion exchange membrane fuel cells (AEMFCs) performance have significantly improved in the last decade (>1 W cm−2), and is now comparable with that of proton exchange membrane fuel cells (PEMFCs). At high current densities, issues in the catalyst layer (CL, composed of catalyst and ionomer), like oxygen transfer, water balance, and microstructural evolution, play important roles in the performance. In addition, CLs for AEMFCs have different requirements than for PEMFCs, such as chemical/physical stability, reaction mechanism, and mass transfer, because of different conductive media and pH environment. The anion exchange ionomer (AEI), which is the soluble or dispersed analogue of the anion exchange membrane (AEM), is required for hydroxide transport in the CL and is normally handled separately with the electrocatalyst during the electrode fabrication process. The importance of the AEI–catalyst interface in maximizing the utilization of electrocatalyst and fuel/oxygen transfer process must be carefully investigated. This review briefly covers new concepts in the complex AEMFC catalyst layer, before a detailed discussion on advances in CLs based on the design of AEIs and electrocatalysts. The importance of the structure–function relationship is highlighted with the aim of directing the further development of CLs for high‐performance AEMFC.

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Single-atom oxygen reduction reaction electrocatalysts of Fe, Si, and N co-doped carbon with 3D interconnected mesoporosity

Abstract: ORR activity of Fe, Si, and N co-doped carbons (FeSiNCs) is first reported that DFT calculations reveal the origin of the ORR activity of FeSiNC, presenting excellent ORR activity and single-cell performances in Zn–air battery and AEMFC.

Cited by 47 publications

References 58 publications

Recent Advances in Waste Plastic Transformation into Valuable Platinum‐Group Metal‐Free Electrocatalysts for Oxygen Reduction Reaction

Recent Advances in Waste Plastic Transformation into Valuable Platinum‐Group Metal‐Free Electrocatalysts for Oxygen Reduction Reaction

Single metal atoms catalysts—Promising candidates for next generation energy storage and conversion devices

Recent Insights on Catalyst Layers for Anion Exchange Membrane Fuel Cells

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