Engineered single-crystal metal-selenide for rapid K-ion diffusion and polyselenide convention

Wang, Chunhui; Qin, Haozhe; Cao, Liang; Wang, Dong; Zhang, Jiafeng; Bao, Zhenan; Ou, Xing

doi:10.1016/j.cej.2021.131963

Cited by 35 publications

(18 citation statements)

References 62 publications

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“…The electrochemical performance of TMSs is widely documented to be closely associated with the intrinsic ionic/electronic states and crystal structures. [ 1 ] However, some inherent issues, including large volume expansion, sluggish ion transfer, and Jahn–Teller distortion (Co t 6 2g e 1 g ) in TMSs, directly cause fast capacity fading and unfavorable rate capability. [ 2 ] Extensive efforts, [ 3 ] including multiple‐phase combination, [ 4 ] anion‐cation doping, [ 5 ] working voltage regulation, [ 6 ] etc., [ 7 ] have been devoted to improving the reaction kinetics of the materials and achieving excellent performance.…”

Section: Introductionmentioning

confidence: 99%

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe₂

et al. 2022

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Heteroatom doping effectively tunes the electronic conductivity of transition metal selenides (TMSs) with rapid K+ accessibility in potassium ion batteries (PIBs). Although considerable efforts are dedicated to investigating the relationship between the doping strategy and the resulting electrochemistry, the doping mechanisms, especially in view of the ion and electronic diffusion kinetics upon cycling, are seldom elucidated systematically. Herein, the crystal structure stability, charge/ion state, and bandgap of the active materials are found to be precisely modulated by favorable heteroatom doping, resulting in intrinsically fast kinetics of the electrode materials. Based on the combined mechanisms of intercalation and conversion reactions, electron and K+ ion transfer in Ni‐doped CoSe2 embedded in carbon nanocomposites (Ni‐CoSe2@NC) can be significantly enhanced via electronic engineering. Benefiting from the synthetic controlled Ni grains, the heterointerface formed by the intermediate products of electrochemical reactions in Ni‐CoSe2@NC strengthens the conversion kinetics and interdiffusion process, developing a low‐barrier mesophase with optimized potassium storage. Overall, an electronic tuning strategy can offer deeper atomic insights into the conversion reaction of TMSs in PIBs.

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Section: Introductionmentioning

confidence: 99%

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe₂

et al. 2022

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“…Clearly, the peaks displayed for GS-OM are related to the coexisting composites of orthorhombic and monoclinic GeS 2 , which provide evidence for the formation of a heterostructure. In addition, no reflections can be detected for carbon in all of the composites owning to the low crystallinity …”

Section: Results and Discussionmentioning

confidence: 96%

“…Based on the R ct values listed in Table S1, GS-OM possesses a minimum impedance value after cycling (22.46 ω) compared to that of GS-M (41.28 ω) and GS-O (124.03 ω), demonstrating the reduced barrier for Na + insertion from electrolyte to electrode. Furthermore, the EIS spectra at the temperature from 0 to 40 °C have been obtained (Figure S7), and the concluded R ct values derived from the EIS curves are summarized in Table S2, which can be further calculated by exploiting the Arrhenius equation (equation S1) to achieve the values of activation energy (Figure c). , Clearly, GS-OM electrode materials express a minimal activation energy of 2.49 kJ mol –1 among all of the synthesized samples, demonstrating the reduced insertion energy barriers resulting from the constructed heterostructure. Meanwhile, at various sodiation states, EIS spectra (Figure S8 and Table S3) also have been tested for analyzing the values of j 0 derived from the fitted R ct results.…”

Section: Results and Discussionmentioning

confidence: 99%

Enhancing Reversible Reactions via Phase Engineering on Bi-Crystal GeS₂ Nanosheets for Superior Sodium-Ion Storage

Qin

Bao

Wang

et al. 2022

ACS Sustainable Chem. Eng.

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Phase engineering for synchronously realizing the demand of electrochemical reactions and structural stability has attracted the great enthusiasm of researchers to obtain high capacity and tolerance for Na + insertion, especially the construction of uniform heterostructures by regulating the crystal structure in the same phase. Herein, ultrathin GeS 2 nanoflakes composed of a mixture of orthorhombic and monoclinic crystal structures have been constructed by employing an in situ Ge-MOF sulfidation method. Benefiting from the combined effect of the accelerated reaction kinetics derived from the self-assembly of heterostructures, and the enhanced reaction reversibility originating from the excellent homogeneity of heterointerfaces and a stable intermediate phase interface, the GS-OM electrode materials show outstanding rate properties (371.9 mA h g −1 at 30 A g −1 ) and Na + uptake/ removal durability (603.9 mA h g −1 at 10 A g −1 over 1000 cycles) and even deliver an excellent practicability (104.01 mA h g −1 at 1 A g −1 over 300 cycles for full cells). Of note, this constructed phase engineering is expected to provide powerful guidance and effective insight for designing better sodium ion battery anodes with not only superior electrochemical reaction reversibility but also improved structure perdurability.

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“…To solve this problem, R ct -derived exchange current density (j 0 ), activation energy (E a ) and EIS spectra are employed to investigate the complexity of ion insertion systematically. [28] As shown in Figure 3c, the R ctderived value of j 0 can be adopted, and a superior j 0 value of SFS-Nest expresses a more beneficial sodiation process into electrode materials (Figure S12 and Table S3, Supporting Information). [29] Consequently, the designed SFS-Nest possesses the greater advantage to achieve Na + -ion insertion during discharge/charge process than other contrastive samples.…”

Section: Resultsmentioning

confidence: 99%

Strain Engineering of Layered Heterogeneous Structure via Self‐Evolution Confinement for Ultrahigh‐Rate Cyclic Sodium Storage

Wang

Qin

et al. 2022

Advanced Energy Materials

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To get a robust architecture for rapid and permanent ion insertion/extraction, various frameworks are constructed, attempting to enhance the high‐rate lifespan. However, uncontrollable structural evolution always results in the structural failure derived from the continuous increasing inner strain during the cycling. Herein, inspired by the nest structure, a stable framework with wave‐like surface morphology and cross‐linked inner configuration is fabricated, which possesses fast ion migration channel and stable structure. Most importantly, the concept of synchronous self‐evolution confinement is proposed for high‐capacity conversion‐type anode materials, which can control the aggregated inner strain and alleviate the inescapable electrode pulverization, thus ensuring the electrode stability and boosting the structure integrity during the repeated cycling. When serving as an anode for sodium ion batteries, the initial nest‐like (SnFe)S2 heterogeneous mildly evolves into a stable architecture with exceptional performance, expressing a prominent rate property (389.4 mA h g−1 at 30 A g−1) and stable durability (627.41 mA h g−1 at 10 A g−1 for 800 cycles). Significantly, this route of strain engineering sheds significant light on solving large volume‐expansion‐type materials for high reversible capacity, especially in the exploration of electrochemical energy storages.

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Engineered single-crystal metal-selenide for rapid K-ion diffusion and polyselenide convention

Cited by 35 publications

References 62 publications

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe₂

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe₂

Enhancing Reversible Reactions via Phase Engineering on Bi-Crystal GeS₂ Nanosheets for Superior Sodium-Ion Storage

Strain Engineering of Layered Heterogeneous Structure via Self‐Evolution Confinement for Ultrahigh‐Rate Cyclic Sodium Storage

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Engineered single-crystal metal-selenide for rapid K-ion diffusion and polyselenide convention

Cited by 35 publications

References 62 publications

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe2

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe2

Enhancing Reversible Reactions via Phase Engineering on Bi-Crystal GeS2 Nanosheets for Superior Sodium-Ion Storage

Strain Engineering of Layered Heterogeneous Structure via Self‐Evolution Confinement for Ultrahigh‐Rate Cyclic Sodium Storage

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Product

Resources

About

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe₂

Doping‐Induced Electronic/Ionic Engineering to Optimize the Redox Kinetics for Potassium Storage: A Case Study of Ni‐Doped CoSe₂

Enhancing Reversible Reactions via Phase Engineering on Bi-Crystal GeS₂ Nanosheets for Superior Sodium-Ion Storage