Densified graphene-like carbon nanosheets with enriched heteroatoms enabling superior gravimetric and volumetric potassium storage capacities

Zhu, Chunliu; Wang, Xuehui; Yang, Lina; Gao, Zongying; Tian, Weiqian; Chen, Jingwei; Shi, Jing; Liu, Shuai; Huang, Minghua; Wu, Jingyi; Wang, Huanlei

doi:10.1016/j.jcis.2023.05.115

Cited by 11 publications

(4 citation statements)

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“…31 Furthermore, a suitable pore structure is known to promote rapid K + transfer and buffer the volume expansion. 32 However, the evident difference is that B-HC has a substantially lower specific surface area and pore volume than P-HC, which are 1.3 m 2 /g and 0.003 cm 3 /g, respectively. The porous structure further verifies the template role of K 2 CO 3 in P-HC.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…P-HC is a type IV isotherm with a specific surface area of 286.0 m 2 /g and a pore volume of 0.840 cm 3 /g . Furthermore, a suitable pore structure is known to promote rapid K + transfer and buffer the volume expansion . However, the evident difference is that B-HC has a substantially lower specific surface area and pore volume than P-HC, which are 1.3 m 2 /g and 0.003 cm 3 /g, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Hard Carbon Anode Synthesized by an In Situ Porous Strategy for Advanced Potassium-Ion Batteries

Shen,

Lai,

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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As the next-generation renewable energy-storage technology at the grid scale, potassium-ion batteries demonstrate huge advantages when carbonaceous materials are adopted as K-storage anodes due to their low cost, environmental friendliness, and broad theoretical and practical basis in lithium-ion batteries. However, such kinds of anode materials still suffer from low capacity and severe volume change during the K-storage process. Herein, an approach based on a molecular-scale in situ porous design is proposed to develop carbonaceous electrodes with uniform pores and defective structures. K+ could move rapidly in the bulk electrode along with mitigated volume expansion owing to the abundant channel structure. Moreover, the discharge capacity of the porous hard carbon electrode increases significantly because of the defect structure in the carbon layer. As a consequence, the developed porous hard carbon electrode can maintain a high capacity of 151.9 mAh/g after 2500 cycles at 1 A/g with an average capacity decay rate per cycle of just 0.008%. These excellent K-storage properties can be attributed to the molecular-scale-derived porous structure and defects with increased carbon layer spacing.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Hard Carbon Anode Synthesized by an In Situ Porous Strategy for Advanced Potassium-Ion Batteries

Shen,

Lai,

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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“…[25,33,55] In the C 1s spectrum, these six peaks centered at 284.8, 286.0, 286.8, 287.8, 288.8, and 289.6 eV, can be attributed to C═C/C─C, C≡N, C─N, C─S, C─O, and C─O═C bonds (Figure 2g). [56] Notably, the corresponding peaks of pure CoFe PBA and pure NSC exhibit lower binding energy compared to CoFe PBA@NSC (Figures S9 and S10, Supporting Information), demonstrating the strong electronic interactions between CoFe PBA and NSC. It is probably attributed to the transfer of partial electrons at the interface, signifying the redistribution of valence states.…”

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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“…In all the catalysts synthesized, two main peaks associated with disordered carbon (1340 cm À 1 , I D ) and graphitic carbon (1587 cm À 1 , I G ) were commonly observed (Figure 2d). [34] G-band is related to E2 g symmetry (the doubly degenerate phonon mode, characteristic for C-C stretching in sp 2 carbon systems), while D-band arose from disordered structure. [35] Ratio of I D /I G is widely adopted as a reflection of defect concentration in sp 2 -hybridized carbon materials.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Selective Electrochemical CO₂ Reduction tuned by N Configuration on graphitic Shells of Nickel Particles

Xue,

Li,

et al. 2024

ChemistrySelect

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Despite of high conductivity and reducing ability, transition metal nanoparticles tend to aggregate and unavoidably impact the selectivity during the proton‐coupled reduction process of CO2RR. New strategy to regulate and utilize the electronic property of transition‐metal particles allows for effective tuning of eCO2RR activity. Through simple creation of N‐doped carbon shells surrounding Ni nanoparticles and controlling the amount and arrangement of the N atoms, successful and long‐lasting electrochemical reduction of CO2 was accomplished. The inherent HER activity was almost completely suppressed. It exhibited FECO above 90 % in a 500 mV potential window, with the optimal up to 96.5 % at −0.78 V vs RHE. In flow cell electrolysis, a current density of 289.4 mA/cm2 was achieved with Faradic efficiency of 96.4 % towards CO. The results of control experiments using different catalysts imply that electron transfer between Ni core and shells was significantly influenced by the property of N atoms. High content of graphitic nitrogen is crucial for the catalytic performance.

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Densified graphene-like carbon nanosheets with enriched heteroatoms enabling superior gravimetric and volumetric potassium storage capacities

Cited by 11 publications

References 87 publications

Hard Carbon Anode Synthesized by an In Situ Porous Strategy for Advanced Potassium-Ion Batteries

Hard Carbon Anode Synthesized by an In Situ Porous Strategy for Advanced Potassium-Ion Batteries

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

Selective Electrochemical CO₂ Reduction tuned by N Configuration on graphitic Shells of Nickel Particles

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Densified graphene-like carbon nanosheets with enriched heteroatoms enabling superior gravimetric and volumetric potassium storage capacities

Cited by 11 publications

References 87 publications

Hard Carbon Anode Synthesized by an In Situ Porous Strategy for Advanced Potassium-Ion Batteries

Hard Carbon Anode Synthesized by an In Situ Porous Strategy for Advanced Potassium-Ion Batteries

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

Selective Electrochemical CO2 Reduction tuned by N Configuration on graphitic Shells of Nickel Particles

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Selective Electrochemical CO₂ Reduction tuned by N Configuration on graphitic Shells of Nickel Particles