Porous nitrogen doped carbon sphere as high performance anode of sodium-ion battery

Li, Dongdong; Chen, Hongbin; Liu, Guoxue; Meng, Wei; Ding, Liang‐Xin; Wang, Haihui

doi:10.1016/j.carbon.2015.07.067

Cited by 149 publications

(62 citation statements)

References 45 publications

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“…[17] The chemical bonding configurations of PCNN, NSPCNN-1, NSPCNN-2, and NSPCNN-3w ere identified by XPS Four characteristic peaks situateda t2 85, 400, 163, and 532 eV are perceived in the survey spectra (Figure 5a), in accordance with C1s, N1s, S2p, and O1ss pectra,r espectively.F or PCNN, only C1sa nd O1sp eaks emerge in the survey spectra.A fter N/S doping, two new peaks at 163 and 400 eV are attributed to N1sa nd S2p, respectively,c onfirming that N/S was doped efficientlyi nto the porous carbon nanosheet networks.T he elemental contents of N/S doped into NSPCNN-1, NSPCNN-2, and NSPCNN-3 are indicated in Ta ble S1 (Supporting Information). [33] On the other hand, it is revealed that the thiophene Sc ontent in NSPCNN-2 is the maximum, generating av ast large interlayer space to facilitate the insertion and extraction of Na + . The C1s peak of NSPCNN-2 can be disintegrated into four peaks at 284.7, [23] 285.7, [24] 287.4, [25] and 290.5 eV [26] (Figure 5b), corresponding to CÀC, CÀN, CÀS, and OÀC=O, respectively.M oreover,t he N1sp eak is decomposed into three peaks centered at 398.3, [27] 399.4, [28] and 400.9 eV, [29] which are consistent with pyridinic N, pyrrolic N, and graphitic N, respectively (Figure 5c).…”

Section: Resultsmentioning

confidence: 99%

N/S Co‐Doped 3 D Porous Carbon Nanosheet Networks Enhancing Anode Performance of Sodium‐Ion Batteries

Zou

Lai

et al. 2017

Chemistry A European J

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A facile and scalable method is realized for the in situ synthesis of N/S co-doped 3 D porous carbon nanosheet networks (NSPCNNs) as anode materials for sodium-ion batteries. During the synthesis, NaCl is used as a template to prepare porous carbon nanosheet networks. In the resultant architecture, the unique 3 D porous architecture ensures a large specific surface area and fast diffusion paths of both electrons and ions. In addition, the import of N/S produces abundant defects, increased interlayer spacings, more active sites, and high electronic conductivity. The obtained products deliver a high specific capacity and excellent long-term cycling performance, specifically, a capacity of 336.2 mA h g at 0.05 A g , remaining as large as 214.9 mA h g after 2000 charge/discharge cycles at 0.5 A g . This material has great prospects for future applications of scalable, low-cost, and environmentally friendly sodium-ion batteries.

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Section: Resultsmentioning

confidence: 99%

N/S Co‐Doped 3 D Porous Carbon Nanosheet Networks Enhancing Anode Performance of Sodium‐Ion Batteries

Zou

Lai

et al. 2017

Chemistry A European J

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“…Many efforts have been made to prepare HCs by pyrolyzing various precursors, such as carbohydrates, [22,23] biomass wastes, [24,25] and polymers. Recent studies demonstrated that the Na storage performance could be further improved by creating more activated sites by applying a nanomorphology design, [31,32] constructing a porous structure, [33][34][35][36] and doping with heteroatoms. Recent studies demonstrated that the Na storage performance could be further improved by creating more activated sites by applying a nanomorphology design, [31,32] constructing a porous structure, [33][34][35][36] and doping with heteroatoms.…”

Section: Introductionmentioning

confidence: 99%

Extended “Adsorption–Insertion” Model: A New Insight into the Sodium Storage Mechanism of Hard Carbons

Sun

Guan

Liu

et al. 2019

Advanced Energy Materials

314

320

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Hard carbons (HCs) are promising anodes of sodium‐ion batteries (SIBs) due to their high capacity, abundance, and low cost. However, the sodium storage mechanism of HCs remains unclear with no consensus in the literature. Here, based on the correlation between the microstructure and Na storage behavior of HCs synthesized over a wide pyrolysis temperature range of 600–2500 °C, an extended “adsorption–insertion” sodium storage mechanism is proposed. The microstructure of HCs can be divided into three types with different sodium storage mechanisms. The highly disordered carbon, with d002 (above 0.40 nm) large enough for sodium ions to freely transfer in, has a “pseudo‐adsorption” sodium storage mechanism, contributing to sloping capacity above 0.1 V, together with other conventional “defects” (pores, edges, heteroatoms, etc.). The pseudo‐graphitic carbon (d‐spacing in 0.36–0.40 nm) contributes to the low‐potential (<0.1 V) plateau capacity through “interlayer insertion” mechanism, with a theoretical capacity of 279 mAh g−1 for NaC8 formation. The graphite‐like carbon with d002 below 0.36 nm is inaccessible for sodium ion insertion. The extended “adsorption–insertion” model can accurately explain the dependence of the sodium storage behavior of HCs with different microstructures on the pyrolysis temperature and provides new insight into the design of HC anodes for SIBs.

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“…6a (EIS was recorded in 5 mM Fe(CN) 6 3À/4À containing 0.5 M KCl), the semicircles at high frequency region can be assigned to the charge transfer resistance (R ct ). 43 Inset is the equivalent circuit, R s , R ct , and CPE represent the electrolyte resistance, the electron-transfer resistance, and the chemical capacitance, respectively. By tting the equivalent circuit inset, the R ct values were 64.8 and 29.8 U for WN NPs/N-C and WN FNs/N-C, respectively.…”

Section: Electrochemical Characterization Of the Catalystsmentioning

confidence: 99%

Efficient synthesis of nitrogen-doped carbon with flower-like tungsten nitride nanosheets for improving the oxygen reduction reactions

et al. 2017

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A novel three-dimensional (3D) electrocatalyst composite was successfully prepared through a facile hydrothermal method, consisting of tungsten nitride nanosheets with flower-like morphology (WN FNs) and nitrogen-doped carbon black (N-C). Highly crystalline WN FNs were observed to be uniformly distributed in N-C, and remarkably promoted the catalytic activities toward oxygen reduction reaction (ORR) of the N-C. Moreover, the electrochemical results proved that, WN FNs/N-C composite shows a significantly higher ORR activity with a 4-electron transfer pathway and limiting current density of 5.8 mA cm À2 in alkaline solutions. The stability test of the nanocomposite showed less degradation after 5 h and its methanol tolerance also was enhanced compared with Pt/C. The improved performance of the WN FNs/N-C composite can be attributed to its unique configuration and the increased exposure of active sites, which suggests that it could serve as an ideal candidate for developing high performance ORR catalysts.

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Porous nitrogen doped carbon sphere as high performance anode of sodium-ion battery

Cited by 149 publications

References 45 publications

N/S Co‐Doped 3 D Porous Carbon Nanosheet Networks Enhancing Anode Performance of Sodium‐Ion Batteries

N/S Co‐Doped 3 D Porous Carbon Nanosheet Networks Enhancing Anode Performance of Sodium‐Ion Batteries

Extended “Adsorption–Insertion” Model: A New Insight into the Sodium Storage Mechanism of Hard Carbons

Efficient synthesis of nitrogen-doped carbon with flower-like tungsten nitride nanosheets for improving the oxygen reduction reactions

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