Commercial-Level Energy Storage via Free-Standing Stacking Electrodes

Liu, Jinghai; Ji, Lei; Wang, Xia; Duan, Limei; Zhou, Jiaqi; Jia, Yongfeng; Zeng, Simei; Huang, Keke; Geng, Zhibin; Wang, Xiyang; Hou, Changmin; Wu, Xiaofeng; Lu, Luhua; Pei, Zhili; Chen, Yongsheng; Zhang, Jun; Feng, Shouhua; Zhang, Yuegang

doi:10.1016/j.matt.2019.07.017

Cited by 21 publications

(12 citation statements)

References 103 publications

(104 reference statements)

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“…Significantly, our device delivers a maximum energy density of 51.6 Wh kg –1 and a maximum power density of 32.1 kW kg –1 . As depicted in Table S2, both values are superior to those of the recently reported symmetric SCs based on carbon materials, − metal compounds, MXene, , and MOFs. , The cycling stability is also an important parameter for the rechargeable energy storage devices in practical applications. Ni 2 [CuPc(NH) 8 ]-SSCs display outstanding capacitance retention of 90.3% after 5000 charge/discharge cycles at 10 A g –1 (Figure f).…”

Section: Resultsmentioning

confidence: 85%

Dual-Redox-Sites Enable Two-Dimensional Conjugated Metal–Organic Frameworks with Large Pseudocapacitance and Wide Potential Window

et al. 2021

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Advanced supercapacitor electrodes require the development of materials with dense redox sites embedded into conductive and porous skeletons. Two-dimensional (2D) conjugated metal−organic frameworks (c-MOFs) are attractive supercapacitor electrode materials due to their high intrinsic electrical conductivities, large specific surface areas, and quasi-onedimensional aligned pore arrays. However, the reported 2D c-MOFs still suffer from unsatisfying specific capacitances and narrow potential windows because large and redox-inactive building blocks lead to low redox-site densities of 2D c-MOFs. Herein, we demonstrate the dual-redox-site 2D c-MOFs with copper phthalocyanine building blocks linked by metal-bis-(iminobenzosemiquinoid) (M 2 [CuPc(NH) 8 ], M = Ni or Cu), which depict both large specific capacitances and wide potential windows. Experimental results accompanied by theoretical calculations verify that phthalocyanine monomers and metalbis(iminobenzosemiquinoid) linkages serve as respective redox sites for pseudocapacitive cation (Na + ) and anion (SO 4 2− ) storage, enabling the continuous Faradaic reactions of M 2 [CuPc(NH) 8 ] occurring in a large potential window of −0.8 to 0.8 V vs Ag/AgCl (3 M KCl). The decent conductivity (0.8 S m −1 ) and high active-site density further endow the Ni 2 [CuPc(NH) 8 ] with a remarkable specific capacitance (400 F g −1 at 0.5 A g −1 ) and excellent rate capability (183 F g −1 at 20 A g −1 ). Quasi-solid-state symmetric supercapacitors are further assembled to demonstrate the practical application of Ni 2 [CuPc(NH) 8 ] electrode, which deliver a stateof-the-art energy density of 51.6 Wh kg −1 and a peak power density of 32.1 kW kg −1 .

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Section: Resultsmentioning

confidence: 85%

Dual-Redox-Sites Enable Two-Dimensional Conjugated Metal–Organic Frameworks with Large Pseudocapacitance and Wide Potential Window

et al. 2021

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“…The high-resolution O 1s spectrum demonstrates three chemical bonding states as quinone/pyridone O, carbonyl O (CO), and ether/phenol O (Figure c). The chemical bonds of nitrogen consist of pyridinic N at 398.8 eV and pyrrolic N at 401.1 eV (Figure d) . The peaks at 780.8 and 796.5 eV in the Co 2p spectrum are ascribed to the deconvolution Co 2p 3/2 and Co 2p 1/2 orbit of Co 2+ , respectively (Figure S2a).…”

Section: Results and Discussionmentioning

confidence: 97%

“…The chemical bonds of nitrogen consist of pyridinic N at 398.8 eV and pyrrolic N at 401.1 eV (Figure 2d). 46 The peaks at 780.8 and 796.5 eV in the Co 2p spectrum are ascribed to the deconvolution Co 2p 3/2 and Co 2p 1/2 orbit of Co 2+ , respectively (Figure S2a). The peaks at 163.2 and 162.2 eV in the S 2p spectrum correspond to S 2p 3/2 and S 2p 1/2 (Figure S2b), and the S−C bond at 164.4 eV implies the chemical coupling between carbon and sulfide in the composites.…”

Section: Resultsmentioning

confidence: 99%

Sulfide with Oxygen-Rich Carbon Network for Good Lithium-Storage Kinetics

Xue

Zhao

et al. 2021

ACS Nano

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Transition metal sulfides are of great interest as electrode material for alkali metal-ion batteries due to their high theoretical capacity. However, sluggish ion migration and electron transfer kinetics lead to poor cycling stability and rate performance, which hinders their practical applications. Herein, we develop a two-step localized carbonization and sulfurization method to construct a CoS2 composite material (CoS2@CNTs@C) from an in situ integrated zeolitic imidazolate framework (ZIF-67) and multiwalled carbon nanotube precursor (ZIF-67@CNTs). The as-prepared CoS2@CNTs@C composites with a nanoscale carbon skeleton inherit a large specific surface area and suitable nanopore size distribution from ZIF-67 and incredibly abundant oxygenated functional groups from CNTs. The theoretical calculation and material characterization demonstrate that the oxygenated functional groups on the porous carbon networks accelerate lithium-ion diffusion and electron transfer and especially electrocatalyze the progressive conversion of Li2S6 to the final product Li2S. Meanwhile, the three-dimensional conductive network guarantees the conductive and structural stability of CoS2@CNTs@C during the repeated lithium-storage process. Therefore, the CoS2@CNTs@C electrode material can deliver an initial discharge capacity of 1282.3 mA h g–1 at 200 mA g–1 with a high Coulombic efficiency of 93.5% and a reversible capacity of 558.8 mA h g–1 at 2000 mA g–1 in 600 cycles with a high capacity retention of 96.1%.

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“…In our previous work, surface oxygenated carbon nitride (OCN) with abundant defects were synthesized from g‐C 3 N 4 through a solid‐state pyrolysis technique. [ 19 ] The electron‐riched B sites at BCN catalysts were modulated by solid‐state reaction of g‐C 3 N 4 with sodium borohydride (NaBH 4 ) under the N 2 atmosphere ( Figure a). The mass ratios of g‐C 3 N 4 to NaBH 4 were set as 1:1, 1:5, and 1:10, with the BCN solids named BCN1, BCN5, and BCN10, respectively.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Electron‐Riched Boron Sites in BCN for Nitrogen Fixation via Alternate Mechanism

Yang

Wang²,

Wang³

et al. 2022

Adv Materials Inter

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The electrochemical nitrogen reduction reaction (eNRR) is promising for achieving sustainable ammonia (NH3) production under mild conditions. However, it is still challenged by nitrogen activation and strong competition with the hydrogen evolution reaction. Here, it is revealed that fine‐tuning the local electron density of boron (B) sites at the boron carbon nitride (BCN) solid catalysts has significant effects on the eNRR activity and selectivity. The concentration of electron‐rich B sites at BCN catalysts are mediated by solid‐state reaction, where their electronic structures are confirmed by electron energy‐loss spectroscopy (EELS) and electron paramagnetic resonance (EPR). Over the density functional theory (DFT) calculations, the nitrogen (N2) activation and reduction at an electron‐riched B site is through an alternate pathway with the determining‐step energy of only 0.92 eV. The optimized BCN5 catalyst with the highest ratio of electron‐riched B sites achieves an outstanding NH3 production rate of 29.3 µg h−1 mg−1cat and the highest Faradaic efficiency of 39%.

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Commercial-Level Energy Storage via Free-Standing Stacking Electrodes

Cited by 21 publications

References 103 publications

Dual-Redox-Sites Enable Two-Dimensional Conjugated Metal–Organic Frameworks with Large Pseudocapacitance and Wide Potential Window

Dual-Redox-Sites Enable Two-Dimensional Conjugated Metal–Organic Frameworks with Large Pseudocapacitance and Wide Potential Window

Sulfide with Oxygen-Rich Carbon Network for Good Lithium-Storage Kinetics

Tailoring Electron‐Riched Boron Sites in BCN for Nitrogen Fixation via Alternate Mechanism

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