An Isolated Zinc–Cobalt Atomic Pair for Highly Active and Durable Oxygen Reduction

Lu, Ziyang; Wang, Bo; Hu, Yongfeng; Liu, Wei; Zhao, Yufeng; Yang, Ruoou; Li, Zhiping; Luo, Jun; Chi, Bin; Jiang, Zheng; Li, Minsi; Mu, Shichun; Liao, Shijun; Zhang, Jiujun; Sun, Xueliang

doi:10.1002/anie.201810175

Cited by 512 publications

(391 citation statements)

References 48 publications

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“…The FPMD simulation (5 ps at 800 K) revealed that the Fe 1 Cu 1 @C 2 N system has very good thermal stability (Figure S14, Supporting Information). Note that during the period of revision, the Cu 1 0 –Cu 1 x + pair anchored on Pd 10 Te 3 alloy nanowires have been developed for selective and efficient electrochemical reduction of CO 2, the Zn–Co atomic pairs on N‐doped carbon support was experimentally achieved and the high activity toward oxygen reduction reaction was demonstrated . Thus, we believe that the highly stable and efficient Fe 1 Cu 1 @C 2 N catalysts could be synthesized by using CuCl 2 and FeCl 2 as the metal precursors.…”

Section: Resultsmentioning

confidence: 99%

1 + 1′ > 2: Heteronuclear Biatom Catalyst Outperforms Its Homonuclear Counterparts for CO Oxidation

Liu

Chen

2019

Small Methods

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By means of density functional theory (DFT) computations, the CO/O2 adsorption and CO oxidation pathways on the biatom catalyst, namely the heteronuclear Fe1Cu1@C2N, in comparison with its homonuclear counterparts Fe2@C2N and Cu2@C2N are systemically investigated. The reactions of O2 dissociation and CO oxidization with preadsorbed CO or O2 are comparably studied. The computations find that the heteronuclear species Fe1Cu1@C2N possesses high stabilities and is feasible to be synthesized experimentally. More importantly, the heteronuclear Fe1Cu1@C2N catalyst has even better catalytic activity toward CO oxidation than its homonuclear counterparts, especially, without suffering the CO‐poisoning problem. Considering the myriad of unexplored heteronuclear dimers that can be potentially anchored at appropriate supports, this work opens a new avenue and provides a useful guideline for further developing bimetal‐based nanocatalysts.

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Section: Resultsmentioning

confidence: 99%

1 + 1′ > 2: Heteronuclear Biatom Catalyst Outperforms Its Homonuclear Counterparts for CO Oxidation

Liu

Chen

2019

Small Methods

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“…Traditionally, carbonized the Co‐based precursors (such as porphyrins and phthalocyanines) have been developed for several decades to synthesize metal contained N‐doped carbon nanostructures, but always suffer from large nanoparticles size and ununiformed structures. Hence, much efforts have been devoted to construct Co–N–C‐based catalysts with novel morphology and structures, such as core–shell or single‐atom dispersed Co–N–C catalysts combined with carbon nanotubes or graphene . Recently, metal–organic frameworks (MOFs) analogues, especially zeolitic‐imidazole frameworks (ZIFs), have been used as a kind of effective precursors to construct nitrogen‐doped carbon supported Co nanoparticles (NPs) or single‐atom structures .…”

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confidence: 99%

Co Nanoislands Rooted on Co–N–C Nanosheets as Efficient Oxygen Electrocatalyst for Zn–Air Batteries

et al. 2019

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been devoted to various energy storage and conversion systems. [1,2] Metal-air batteries, especially Zn-air batteries (ZABs) have been regarded as a promising energy storage system due to their low-cost, high theoretical specific energy density (1084 Wh kg −1 ), and environmental friendliness. [3][4][5] Nevertheless, the multistep and proton-coupled electron transfer processes of the reversible oxygen reactions lead to sluggish kinetics for oxygen reduction (ORR) and oxygen evolution (OER) at aircathode, which are the bottlenecks of inefficient and unideal lifetime. [6] The current benchmark catalysts for simply ORR or OER are precious-metal-based catalysts (Pt, Ir, RuO 2 , etc.), but their high cost, supply scarcity, and poor bifunctional catalytic characters have greatly restricted their applications in ZABs. [7,8] In response, various transition-based catalysts with high activity and good durability have been explored, such as transition metal oxides, chalcogenides, and metal-heteroatom doped carbon materials. [9][10][11][12][13][14] Despite significant progress, current bifunctional catalysts are still facing the problems of insufficient activity and stability together with poor mass transport properties.Alternatively, metal-nitrogen-carbon (M-N-C) systems comprising the earth abundant transition metals and catalytic active metalN x centers with carbonized ligand have received growing interest due to their low cost and excellent catalytic activities. [15][16][17] Specially, Co-N-C has emerged as ORR catalyst for improvement the overall performance of ZABs. [18,19] Inspired by the excellent OER performance of Co-based catalysts (e.g., cobalt metal and cobalt oxide) and intrinsically electrical conductivity of Co metal, [20,21] so constructing hierarchical structure of Co-N-C contained Co metal maybe an effective way to promote the bifunctional ORR/OER activity. At present, various strategies have been applied to synthesize Co-N-C structures. Traditionally, carbonized the Co-based precursors (such as porphyrins and phthalocyanines) have been developed for several decades to synthesize metal contained N-doped carbon nanostructures, [22,23] but always suffer from large nanoparticles size and ununiformed structures. Hence, much efforts have been devoted to construct Co-N-C-based catalysts with novel morphology and structures, such as core-shell or single-atom dispersed Co-N-C catalysts combined with carbon nanotubes Developing non-precious-metal bifunctional oxygen reduction and evolution reaction (ORR/OER) catalysts is a major task for promoting the reaction efficiency of Zn-air batteries. Co-based catalysts have been regarded as promising ORR and OER catalysts owing to the multivalence characteristic of cobalt element. Herein, the synthesis of Co nanoislands rooted on Co-N-C nanosheets supported by carbon felts (Co/Co-N-C) is reported. Co nanosheets rooted on the carbon felt derived from electrodeposition are applied as the self-template and cobalt source. The synergistic effect of metal Co islands with OER a...

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“…I n recent years, single-atom catalysts (SACs) have attracted considerable attention as a means by which to maximize precious metal utilization and generate well-defined, uniform active sites [1][2][3][4][5][6][7][8][9] . SACs exhibit superior catalytic performance (activity and/or selectivity) for thermal oxidation 1,10-12 and hydrogenation 9,[13][14][15][16][17] , electrochemistry [18][19][20][21][22][23] , and industrially important processes such as the water-gas shift reaction, C-C coupling, C-H activation, and methanol reforming 11,[24][25][26][27] . Counter-intuitively, SACs were recently reported to exhibit better stability than their nanoparticle (NP) counterparts, highlighting their potential for commercial applications 28,29 .…”

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confidence: 99%

Strong metal-support interaction promoted scalable production of thermally stable single-atom catalysts

et al. 2020

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Single-atom catalysts (SACs) have demonstrated superior catalytic performance in numerous heterogeneous reactions. However, producing thermally stable SACs, especially in a simple and scalable way, remains a formidable challenge. Here, we report the synthesis of Ru SACs from commercial RuO 2 powders by physical mixing of sub-micron RuO 2 aggregates with a MgAl 1.2 Fe 0.8 O 4 spinel. Atomically dispersed Ru is confirmed by aberration-corrected scanning transmission electron microscopy and X-ray absorption spectroscopy. Detailed studies reveal that the dispersion process does not arise from a gas atom trapping mechanism, but rather from anti-Ostwald ripening promoted by a strong covalent metalsupport interaction. This synthetic strategy is simple and amenable to the large-scale manufacture of thermally stable SACs for industrial applications.

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An Isolated Zinc–Cobalt Atomic Pair for Highly Active and Durable Oxygen Reduction

Cited by 512 publications

References 48 publications

1 + 1′ > 2: Heteronuclear Biatom Catalyst Outperforms Its Homonuclear Counterparts for CO Oxidation

1 + 1′ > 2: Heteronuclear Biatom Catalyst Outperforms Its Homonuclear Counterparts for CO Oxidation

Co Nanoislands Rooted on Co–N–C Nanosheets as Efficient Oxygen Electrocatalyst for Zn–Air Batteries

Strong metal-support interaction promoted scalable production of thermally stable single-atom catalysts

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