Interconnected honeycomb-like carbon with rich nitrogen/sulfur doping for stable potassium ion storage

Zhang, Yafei; Wei, Wenhong; Zhu, Chunliu; Gao, Zongying; Shi, Jing; Huang, Minghua; Liu, Shuai; Wang, Huanlei

doi:10.1016/j.electacta.2022.140596

Cited by 9 publications

(3 citation statements)

References 61 publications

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“…As a comparison, Figure 6c and Table S6 (Supporting Information) demonstrate the performance of CoFe PBA@NSC//AC PIC in comparison to previously published devices, highlighting the excellent energy and power performance of CoFe PBA@NSC//AC PIC. [ 83–88 ] Moreover, Figure 6d illustrates that the CoFe PBA@NSC//AC PIC can be cycled over 5000 cycles at 10 A g −1 with excellent capacity retention of 100% and Coulombic efficiency close to 97%.…”

Section: Resultsmentioning

confidence: 99%

Thermal Induced Conversion of CoFe Prussian Blue Analogs Nanocubes Wrapped by Doped Carbon Network Exhibiting Fast and Stable Potassium Ion Storage as Anode

Ouyang,

Li,

et al. 2023

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Prussian blue analogs (PBAs) show great promise as anode materials for potassium‐ion batteries (PIBs) due to their high specific capacity. However, PBAs still suffer from the drawbacks of low electronic conductivity and poor structural stability, leading to inadequate rate and cyclic performance. To address these limitations, CoFe PBA nanocubes wrapped with N/S doped carbon network (CoFe PBA@NSC) as anode for PIBs is designed by using thermal‐induced in situ conversion strategy. As expected, the structural advantages of nanosized PBA cubes, such as abundant interfaces and large surface area, enable the CoFe PBA@NSC electrode to demonstrate superior rate properties (557 and 131 mAh g−1 at 0.05 and 10 A g−1) and low capacity degradation (0.093% per cycle over 1000 cycles at 0.5 A g−1). Furthermore, several ex situ characterizations revealed the K‐ion storage mechanism. Fe+ and Co0 are generated during potassicization, followed by a completely reversible chemical state of iron while some cobalt monomers remained during depotassication. Additionally, the as‐built potassium‐ion hybrid capacitor based on CoFe PBA@NSC anode exhibits a high energy density of 118 Wh kg−1. This work presents an alternative but promising synthesis route for Prussian blue analogs, which is significant for the advancement of PIBs and other related energy storage devices.

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Section: Resultsmentioning

confidence: 99%

Thermal Induced Conversion of CoFe Prussian Blue Analogs Nanocubes Wrapped by Doped Carbon Network Exhibiting Fast and Stable Potassium Ion Storage as Anode

Ouyang,

Li,

et al. 2023

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“…This property can significantly expand the distance between carbon layers, allowing for the embedding of potassium ions. [84,85] Hu et al reported N/S co-doped porous carbon nanosheets (SÀ NÀ PCNs). [86] The pyridine-N content of NÀ PCN increased from 33.8 % to 52.9 % of SÀ NÀ PCN after doping with additional sulfur atoms, suggesting that the addition of sulfur has been shown to enhance the formation of carbon materials with high pyridinium content.…”

Section: Biomass-derived Carbonmentioning

confidence: 99%

“…Compared to nitrogen, sulfur has a relatively larger size but lower electronegativity. This property can significantly expand the distance between carbon layers, allowing for the embedding of potassium ions [84,85] . Hu et al.…”

Section: Anode Materials For Pihcsmentioning

confidence: 99%

Advanced Electrode Materials for Potassium‐Ion Hybrid Capacitors

Chen

Shen

Xiong

et al. 2023

Batteries & Supercaps

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Potassium‐ion hybrid capacitors (PIHCs) overcome the limitations of potassium‐ion batteries (PIBs) and supercapacitors (SCs) and integrate the advantages of both, including high energy density, high power density, low cost, long cycle life, and stable electrochemical performance. However, the development of PIHCs is hindered by thermodynamic instability and kinetic hysteresis. Additionally, the dynamic mismatch between anode and cathode materials poses an urgent challenge. To this end, many research works related to material development have been dedicated to overcoming the drawbacks. In this review, the energy storage mechanism of PIHCs is briefly introduced. Moreover, the research progress and achievements of anode and cathode materials in recent years are reviewed, including carbon‐based materials, MXenes, transition metal materials, Prussian blue and its analogues. Finally, the challenges and prospects of PIHCs are proposed, together with guiding significant research directions in the future.

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Engineering Local Graphitic Domains to Balance Defect Active Site and Electronic Conduction Ability in Coal‐Derived Carbon Anode for Superior Potassium Ions Storage

Jiang,

Chen,

Chen

et al. 2024

Adv Funct Materials

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Potassium‐ion hybrid capacitors (PIHCs) are regarded as one of the promising candidates for large‐scale energy storage technologies. Nevertheless, the lack of suitable anode materials combined with fast ion diffusion kinetics and favorable cycle stability restricts their application. Herein, a catalyst‐confined graphitization strategy is proposed to synthesize low‐cost coal‐based carbon anodes, which have controllable heteroatom co‐doping and rich defect sites, together with local graphitic domains. Density functional theory calculations and kinetic analysis are performed to uncover the coupling effect for heteroatom dual‐doping and defective structures. Importantly, the introduction of graphitic domains ensures good electric conductivity and charge transfer kinetics while preserving rich defects and active sites. The optimized NC‐950 exhibits superior potassium storage capacity, which delivers a high reversible specific capacity (363.3 mAh g−1), impressive rate capability (93.9 mAh g−1 at 2 A g−1), and stable cycling performance. As a practical device application, the PIHCs (NC‐950//AC) are assembled using the NC‐950 anode and commercial activated carbon (AC) cathode, which exhibits the maximum energy density of 97.0 Wh kg−1 and excellent cycling stability (10 000 cycles). Significantly, this work unveils a new pathway to developing low‐cost and fast reaction kinetics carbon anode for advanced electrochemical supercapacitors.

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Interconnected honeycomb-like carbon with rich nitrogen/sulfur doping for stable potassium ion storage

Cited by 9 publications

References 61 publications

Thermal Induced Conversion of CoFe Prussian Blue Analogs Nanocubes Wrapped by Doped Carbon Network Exhibiting Fast and Stable Potassium Ion Storage as Anode

Thermal Induced Conversion of CoFe Prussian Blue Analogs Nanocubes Wrapped by Doped Carbon Network Exhibiting Fast and Stable Potassium Ion Storage as Anode

Advanced Electrode Materials for Potassium‐Ion Hybrid Capacitors

Engineering Local Graphitic Domains to Balance Defect Active Site and Electronic Conduction Ability in Coal‐Derived Carbon Anode for Superior Potassium Ions Storage

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