Sulfate Ions Induced Concave Porous S‐N Co‐Doped Carbon Confined FeCx Nanoclusters with Fe‐N4 Sites for Efficient Oxygen Reduction in Alkaline and Acid Media

Jin, Huihui; Zhao, Xin; Liang, Lvhan; Ji, Pengxia; Liu, Bingshuai; Hu, Chenxi; He, Daping; Mu, Shichun

doi:10.1002/smll.202101001

Cited by 53 publications

(29 citation statements)

References 48 publications

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“…Pt-based catalysts are considered to be the most effective catalysts for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). [1][2][3][4] However, the sluggish oxygen reduction kinetics and poor durability of Pt-based materials limit their widespread application. [5][6][7][8][9][10] Based on the Sabatier principle for designing catalysts rationally, the catalysts bind O ad should be at an optimal value.…”

Section: Introductionmentioning

confidence: 99%

Tuning d‐Band Center of Pt by PtCo‐PtSn Heterostructure for Enhanced Oxygen Reduction Reaction Performance

Chen

Qian

Chu

et al. 2022

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The development of efficient and stable Pt‐based catalysts is significant but challenging for fuel cells. Herein, Sn and Co elements are introduced into Pt to form PtCo‐PtSn/C heterostructure for enhancing the oxygen reduction reaction (ORR). Electrochemical results indicate that it has remarkable ORR intrinsic activity with a high mass activity (1,158 mA mg–1 Pt) at 0.9 V in HClO4 solution, which is 2.18‐, 6.81‐, and 9.98‐fold higher than that of PtCo/C, PtSn/C, and Pt/C. More importantly, the catalytic activity attenuation for PtCo‐PtSn/C is only 27.4% after 30 000 potential cycles, showing high stability. Furthermore, theoretical calculations reveal that the enhancement is attributed to charge transfer and the unique structure of PtCo‐PtSn/C heterostructure, which regulate the d‐band center of Pt and prevent non‐noble metals from further dissolution. This work thus opens a way to design and prepare highly efficient Pt‐based alloy catalysts for proton exchange membrane fuel cells.

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Section: Introductionmentioning

confidence: 99%

Tuning d‐Band Center of Pt by PtCo‐PtSn Heterostructure for Enhanced Oxygen Reduction Reaction Performance

Chen

Qian

Chu

et al. 2022

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“…After a pyrolysis treatment at 950 °C, ZIF‐8 and FeCo@ZIF precursors were transformed into NC and FeCo−NC, respectively. As shown in Figure S1a, there are two broad peaks around 26 and 44° in the XRD patterns of N‐doped C (NC) and FeCo−NC, which are assigned to (002) and (101) planes of the carbon substrate [22]. The absence of other significant diffraction peaks indicates that no crystalline metal or metal compound nanoparticles were formed in the prepared catalysts [23].…”

Section: Resultsmentioning

confidence: 98%

Bimetallic FeCo−N−C Catalyst for Efficient Oxygen Reduction Reaction

et al. 2022

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Oxygen reduction reaction (ORR) is being deeply studied because of its significance in energy storage and conversion. It is an urgent and challenging task to explore low‐cost ORR catalysts with excellent activity and outstanding long‐term stability. Herein, we report an efficient bimetallic FeCo catalyst based on nitrogen‐doped carbon (FeCo−NC) for ORR by pyrolysis of FeCo‐1,10‐phenanthroline complexes (FeCo‐phen) supported on ZIF‐8. The as‐synthesized FeCo−NC catalyst shows excellent ORR activity, improved durability and excellent methanol cross poisoning resistance, which are ascribed to the formation of metal‐N−C active sites, the synergistic effect between Fe and Co, as well as the porous structure.

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“…[ 41 ] In addition, the high‐temperature pyrolysis may also result in the decreased accessibility to participate in the ORR process due to a large number of Fe–N x being covered by graphitic carbon matrix, which greatly reduces the catalytic activity of the Fe–N–C electrocatalysts. [ 42 ]…”

Section: Types Of Zif‐derived M–n–c For Orr Electrocatalysismentioning

confidence: 99%

Recent Advances in ZIF‐Derived Atomic Metal–N–C Electrocatalysts for Oxygen Reduction Reaction: Synthetic Strategies, Active Centers, and Stabilities

Chen

Yan

et al. 2022

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oxidation reaction on the anode, while the oxygen undergoes a reduction reaction on the cathode. However, the sluggish kinetics and instability of oxygen reduction reaction (ORR) electrocatalysts, especially in the practical acidic and oxidation environments, have severely hindered their further developments. Therefore, engineering ORR electrocatalysts with high activity and good stability is desired to promote energy transformation efficiency. By far, the most popular ORR electrocatalysts are the costly platinum group metal (PGM)-derived ones. However, the use of expensive, unsatisfied stability, and scarce PGM materials as ORR electrocatalyst limits the developments of this field. [8][9][10][11][12][13][14][15][16][17][18] To improve catalytic efficiency and cut the high expenditure, various strategies have been studied in recent years. Among them, electrocatalysts based on the metal-N-C (M-N-C) structures have attracted extensive attention in recent years due to their unique electronic structure to bind with the intermediates, abundant substitutional metal elements, maximum atomic utilization efficiency, as well as excellent stability. [19][20][21][22][23][24][25] Besides, compared to ORR electrocatalysts loaded with nanoclusters or nanoparticles, the M-N-C presents unambiguous catalytic sites and facile synthesis, which help the understanding of ORR mechanisms by precise theoretical calculations and in Exploring highly active, stable electrocatalysts with earth-abundant metal centers for the oxygen reduction reaction (ORR) is essential for sustainable energy conversion. Due to the high cost and scarcity of platinum, it is a general trend to develop metal-N-C (M-N-C) electrocatalysts, especially those prepared from the zeolite imidazolate framework (ZIF) to replace/minimize usage of noble metals in ORR electrocatalysis for their amazingly high catalytic efficiency, great stability, and readily-tuned electronic structure. In this review, the most pivotal advances in mechanisms leading to declined catalytic performance, synthetic strategies, and design principles in engineering ZIF-derived M-N-C for efficient ORR catalysis, are presented. Notably, this review focuses on how to improve intrinsic ORR activity, such as M-N x -C y coordination structures, doping metal-free heteroatoms in M-N-C, dual/ multi-metal sites, hydrogen passivation, and edge-hosted M-N x . Meanwhile, how to increase active sites density, including formation of M-N complex, spatial confinement effects, and porous structure design, are discussed. Thereafter, challenges and future perspectives of M-N-C are also proposed. The authors believe this instructive review will provide experimental and theoretical guidance for designing future, highly active ORR electrocatalysts, and facilitate their applications in diverse ORR-related energy technologies.

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Sulfate Ions Induced Concave Porous S‐N Co‐Doped Carbon Confined FeC_x Nanoclusters with Fe‐N₄ Sites for Efficient Oxygen Reduction in Alkaline and Acid Media

Cited by 53 publications

References 48 publications

Tuning d‐Band Center of Pt by PtCo‐PtSn Heterostructure for Enhanced Oxygen Reduction Reaction Performance

Tuning d‐Band Center of Pt by PtCo‐PtSn Heterostructure for Enhanced Oxygen Reduction Reaction Performance

Bimetallic FeCo−N−C Catalyst for Efficient Oxygen Reduction Reaction

Recent Advances in ZIF‐Derived Atomic Metal–N–C Electrocatalysts for Oxygen Reduction Reaction: Synthetic Strategies, Active Centers, and Stabilities

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