Direct synthesis of P/O-enriched pitch-based carbon microspheres from a coordinated emulsification and pre-oxidation towards high-rate potassium-ion batteries

Liu, Chang; Zheng, Hongjie; Yu, Kai; Feng, Daming; Li, Hui; Yao, Junjun; Zhang, Xu; Ma, Tianyi; Qiu, Jieshan

doi:10.1016/j.carbon.2022.03.064

Cited by 40 publications

(17 citation statements)

References 38 publications

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“…The FTIR spectra curves (Figure C) are used to reveal the changes in chemical structures of samples at different heat treatment stages. Obviously, the stretching and bending vibrations peaks for NaHCO 3 (Table S1) are located at 1000–500 cm –1 (region 1), 1750–1200 cm –1 (region 2), 1915 cm –1 (region 3), and 3300–2000 cm –1 (region 4). − The CTP spectra exhibit three characteristic regions: aromatic C–H out-of-plane bending bands (region 5 located at 900–700 cm –1 ), C–H in-plane bending peak and aromatic CC stretching peak approximately located at 1600 and 1460 cm –1 (region 6), respectively, and aliphatic C–H stretching bands (region 7 at 3000–2800 cm –1 ). − The characteristic peaks of CO 3 2– located at 1000–750, 1425, and 1770 cm –1 appeared at a pyrolysis temperature of 100 °C, indicating NaHCO 3 has begun to decompose into Na 2 CO 3 at 100 °C . However, when the temperature reached 200 °C, the NaHCO 3 characteristic peaks (regions 1, 2, 3, and 4) disappeared, meaning that NaHCO 3 has completely decomposed to Na 2 CO 3 .…”

Section: Resultsmentioning

confidence: 99%

Dual-Role Salt-Assisted Construction of Hierarchically Porous Carbon for Supercapacitors with High Energy and Power Density

Liu

Shi

Song

et al. 2022

ACS Appl. Energy Mater.

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Hierarchically porous carbons (HPCs) have attracted much attention because of their potential application in carbonbased supercapacitors. Here, we list a facile and green method to obtain HPCs by annealing a coal tar pitch with sodium bicarbonate. The produced gases and sodium carbonate template can guide the formation of carbon products with a multiscale pore structure. Further activation by KOH endows HPC with a surface area of 2851.7 m 2 g −1 and a total pore volume of 2.4 cm 3 g −1 . Accordingly, such an HPC electrode achieves a specific capacitance of 321.5 F g −1 (0.5 A g −1 ) and retains 230.0 F g −1 (100.0 A g −1 ). Moreover, the HPC-based symmetric supercapacitor exhibits superior cyclic stability (1.1% capacity decay after 30,000 cycles) in an aqueous electrolyte. In the TEABF 4 /acetonitrile electrolyte, the assembled device displays a high energy density of 53.0 Wh kg −1 and still retains 77.9% even when the power density is increased from 750.0 to 15,000.0 W kg −1 . We believe that the salt-assisted synthesis strategy for HPC paves a green way to developing high-performance supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Dual-Role Salt-Assisted Construction of Hierarchically Porous Carbon for Supercapacitors with High Energy and Power Density

Liu

Shi

Song

et al. 2022

ACS Appl. Energy Mater.

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“…Compared with the recent studies on carbon-based PIBs anodes (Figure 2j), the OLSC exhibits an excellent rate performance and stability while ensuring a lower voltage plateau. [11,27,[37][38][39][40][41] The full-cell tests of OLSC further proved the practical application of OLSC in potassium-ion batteries. As shown in Figure S7 (Supporting Information), the K 2 MnFe(CN) 6 ||OLSC full cell showed a suitable voltage plateau about 1.5 V, and a discharge capacity of 78.6 mAh g -1 after 100 cycles.…”

Section: Electrochemical Performance Of Olscmentioning

confidence: 99%

Bitumen‐Derived Onion‐Like Soft Carbon as High‐Performance Potassium‐Ion Battery Anode

Tan

Wang

Liu

et al. 2022

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Potassium‐ion batteries (PIBs) have been regarded as a competitive alternative for lithium‐ion batteries, owing to the natural abundance, low cost, and similar rocking‐chair working mechanism of potassium element. However, it is challenging to simultaneously prepare suitable potassium ion anode materials of low voltage plateau, high capacity, and long cycle life. In this work, onion‐like soft carbon (OLSC) of high heteroatom content is prepared by using solvent‐sensitive self‐assembly properties of asphaltene molecules. The OLSC electrode exhibits a low voltage plateau because of a high degree of graphitization. Meanwhile, it possesses excellent cycling stability and rate capability due to the high stability of the onion‐like structure and fast transport of potassium ions, the latter of which is caused by heteroatom‐induced expanded interlayers as found by first‐principle calculations. Compared with existing carbon materials, the OLSC synthesized in this study exhibits a high reversible capacity of 466 mAh g–1 at 20 mA g–1, a reversible capacity of 222 mAh g–1 and capacity retention of 95% after 1600 cycles at 1 A g–1. This work connects the nanostructure of carbon materials and electrochemical performance and provides new insights in improving carbon‐based anodes for PIBs.

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“…LD materials can be synthesized by both bottom-up and topdown techniques. 42,43 Bottom-up strategy involves stacking atoms onto each other to synthesize LD materials, while the top-down method implies that LD materials are synthesized by exfoliating bulk counterpart crystals to obtain individual pieces.…”

Section: Pristine Ld Materials With Intrinsic Piezoelectricitymentioning

confidence: 99%

“…LD materials can be synthesized by both bottom-up and top-down techniques. , Bottom-up strategy involves stacking atoms onto each other to synthesize LD materials, while the top-down method implies that LD materials are synthesized by exfoliating bulk counterpart crystals to obtain individual pieces. The bottom-up synthesis includes chemical vapor deposition (CVD), a sol–gel method, self-assembly processes, and hydro/solvothermal synthesis.…”

Section: Pristine Ld Materials With Intrinsic Piezoelectricitymentioning

confidence: 99%

Enhanced Piezoelectric Properties Enabled by Engineered Low-Dimensional Nanomaterials

Wang

Guo

et al. 2022

ACS Appl. Nano Mater.

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Today's electronic products are moving toward personal, portable, and flexible electronics with the integration of multifunctional sensors and self-powering technologies. Consequently, efficient and highperformance mechanical−electronic interfaces will be heavily considered in the development of future electronics. Piezotronic materials are active components for the conversion of mechanical stimuli to electrical signals and vice versa. In particular, low-dimensional (LD) materials offer greater efficiencies in piezoelectric materials than their bulk counterparts. Piezoelectric LD materials have attracted significant attention because of their successful integration in miniatured and flexible electronics. The origin of the piezoelectric responses of the LD materials is ascribed as a loss of centrosymmetry and inversion center. However, challenges exist in utilizing piezoelectric materials to their full potential, including effective charge separation upon external stimuli and imperfections in their crystal structures. Therefore, considerable efforts have been devoted to engineering the LD piezoelectric materials by rational structural design and chemical modification to further improve the piezoelectric performances. Herein, we comprehensively review the recent advances for engineering technologies of piezoelectric materials on the scale of zero-dimensional (0D), one-dimensional (1D), and two-dimensional (2D), which are mainly focused on creating defects, doping, and forming Janus structures and heterointerfaces with other materials. Meanwhile, the relationships between the morphological, physicochemical, and electronics of engineered LD piezoelectric materials and their piezoelectric performances are systematically discussed. Finally, we further present the prospect and challenge of the field and future research direction, aiming to inspire more research for achieving high-performance LD piezoelectric materials in sensors, actuators, and micro-and nanoelectromechanical systems.

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Direct synthesis of P/O-enriched pitch-based carbon microspheres from a coordinated emulsification and pre-oxidation towards high-rate potassium-ion batteries

Cited by 40 publications

References 38 publications

Dual-Role Salt-Assisted Construction of Hierarchically Porous Carbon for Supercapacitors with High Energy and Power Density

Dual-Role Salt-Assisted Construction of Hierarchically Porous Carbon for Supercapacitors with High Energy and Power Density

Bitumen‐Derived Onion‐Like Soft Carbon as High‐Performance Potassium‐Ion Battery Anode

Enhanced Piezoelectric Properties Enabled by Engineered Low-Dimensional Nanomaterials

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