Atomic Co/Ni dual sites and Co/Ni alloy nanoparticles in N-doped porous Janus-like carbon frameworks for bifunctional oxygen electrocatalysis

Li, Zehui; He, Hongyan; Cao, Hongbin; Sun, Shaobo; Diao, Wenlin; Gao, Denglei; Zhang, Shuangshuang; Guo, Zhuang; Li, Mingjie; Liu, Rongji; Ren, Dunhao; Liu, Chenming; Zhang, Yi; Yang, Zailin; Jiang, Jingkun; Lu, Peilong

doi:10.1016/j.apcatb.2018.08.074

Cited by 339 publications

(158 citation statements)

References 57 publications

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“…), are emerging as a promising candidate for the ORR [18][19][20][21][22]. The tailored electronic structure and coordination environments of SACs bring new possibilities for improving ORR performance and fundamental understanding of active centers due to their structural simplicity [23][24][25]. An annealing process has been demonstrated for the effective formation of active metal centers, which however causes the difficulty in controlling the microstructure/porosity and coordination environment of the SACs [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Secondary-Atom-Doping Enables Robust Fe–N–C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

et al. 2020

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• Secondary-atom-doped strategy was proposed to synthesize single-atom electrocatalyst. • The increase in both the density of active sites and their intrinsic activity was achieved simultaneously. • The resultant single-atom catalyst shows outstanding ORR activity in acidic media. ABSTRACT Single-atom catalysts (SACs) with nitrogen-coordinated nonprecious metal sites have exhibited inimitable advantages in electrocatalysis. However, a large room for improving their activity and durability remains. Herein, we construct atomically dispersed Fe sites in N-doped carbon supports by secondary-atom-doped strategy. Upon the secondary doping, the density and coordination environment of active sites can be efficiently tuned, enabling the simultaneous improvement in the number and reactivity of the active site. Besides, structure optimizations in terms of the enlarged surface area and improved hydrophilicity can be achieved simultaneously. Due to the beneficial microstructure and abundant highly active FeN 5 moieties resulting from the secondary doping, the resultant catalyst exhibits an admirable half-wave potential of 0.81 V versus 0.83 V for Pt/C and much better stability than Pt/C in acidic media. This work would offer a general strategy for the design and preparation of highly active SACs for electrochemical energy devices.

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Section: Introductionmentioning

confidence: 99%

Secondary-Atom-Doping Enables Robust Fe–N–C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

et al. 2020

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“…All of these observations suggest that the CoNi@PNCFs can effectively adsorb the soluble LiPS through chemical trapping interaction. [ 51,55 ] To further understand the chemical adsorption of CoNi@PNCFs on LiPS, the binding energy of the Li 2 S 6 on the pyridinic N, metal‐N‐C active sites, and metallic Co/Ni surface was evaluated using density functional theory (DFT) calculations. As shown in Figure 3f, the CoNi‐N‐C site exhibits a binding energy of 2.54 eV, higher than that of pyridinic N (p‐N, 2.01 eV), Co‐N‐C (2.21 eV) and Ni‐N‐C (2.09 eV).…”

Section: Resultsmentioning

confidence: 99%

All‐Purpose Electrode Design of Flexible Conductive Scaffold toward High‐Performance Li–S Batteries

Zhang

et al. 2020

Adv Funct Materials

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The main obstacles that hinder the development of efficient lithium sulfur (Li-S) batteries are the polysulfide shuttling effect in sulfur cathode and the uncontrollable growth of dendritic Li in the anode. An all-purpose flexible electrode that can be used both in sulfur cathode and Li metal anode is reported, and its application in wearable and portable storage electronic devices is demonstrated. The flexible electrode consists of a bimetallic CoNi nanoparticle-embedded porous conductive scaffold with multiple Co/Ni-N active sites (CoNi@PNCFs). Both experimental and theoretical analysis show that, when used as the cathode, the CoNi and Co/Ni-N active sites implanted on the porous CoNi@PNCFs significantly promote chemical immobilization toward soluble lithium polysulfides and their rapid conversion into insoluble Li 2 S, and therefore effectively mitigates the polysulfide shuttling effect. Additionally, a 3D matrix constructed with porous carbonous skeleton and multiple active centers successfully induces homogenous Li growth, realizing a dendrite-free Li metal anode. A Li-S battery assembled with S/CoNi@PNCFs cathode and Li/CoNi@PNCFs anode exhibits a high reversible specific capacity of 785 mAh g −1 and long cycle performance at 5 C (capacity fading rate of 0.016% over 1500 cycles).

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“…Nanostructured carbon supported transition metal atoms or metal alloys nanoparticles have been widely explored for ORR and OER electrocatalysis . As above mentioned, heteroatoms, such as N, can be incorporated into carbon frameworks for enhanced electrocatalytic activity through electron modulation.…”

Section: Carbon‐based Compositesmentioning

confidence: 99%

“…Among them, Fe, Co, Ni, and their alloys have attracted growing research interest for ZAB applications and been extensively investigated by experimental and theoretical studies . For instance, Ni 3 Fe nanoparticles embedded in N‐doped 2D porous graphitic carbon (Ni 3 Fe/N−C) sheets have been obtained through a pyrolysis‐based approach .…”

Section: Carbon‐based Compositesmentioning

confidence: 99%

Recent Advances in Carbon‐Based Bifunctional Oxygen Catalysts for Zinc‐Air Batteries

Liu

Tong

Yan

et al. 2019

Batteries & Supercaps

124

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air batteries (ZABs) have recently received tremendous research attention due to their high theoretical energy densities. However, current ZABs suffer from poor energy efficiency and cyclability, mainly owing to the sluggish kinetics of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) on the air electrode. Therefore, rational design of efficient bifunctional oxygen electrocatalysts with high activity and stability is essential for improving battery performance. Carbon-based nanomaterials are promising candidates for bifunctional oxygen catalysis. In this review, we present the latest development of carbon-based bifunctional electrocatalysts for ZABs. Firstly, the related reaction mechanisms of bifunctional ORR/OER catalysts are introduced. Then, the recent advances in developing carbon-based bifunctional catalysts with tailored structure and promising catalytic performance are introduced following the regulation strategies, e. g., heteroatom doping, defect engineering, and/or hybridizing with other active materials. Finally, the key challenges and perspectives of advanced ZABs are provided to better shed light on future research. . This review aims to provide timely information of the carbon-based bifunctional oxygen catalysts for researchers and to shed light on the future development of high-performance catalysts and ZABs. 2 3 4 5 6 7 8

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Atomic Co/Ni dual sites and Co/Ni alloy nanoparticles in N-doped porous Janus-like carbon frameworks for bifunctional oxygen electrocatalysis

Cited by 339 publications

References 57 publications

Secondary-Atom-Doping Enables Robust Fe–N–C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

Secondary-Atom-Doping Enables Robust Fe–N–C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

All‐Purpose Electrode Design of Flexible Conductive Scaffold toward High‐Performance Li–S Batteries

Recent Advances in Carbon‐Based Bifunctional Oxygen Catalysts for Zinc‐Air Batteries

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