Nickel-Doped Titanium Oxide with the Rutile Structure for High-Performance Sodium Storage
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Le résumé fourni par la source
High Resolution Image Download MS PowerPoint Slide We prepared rutile TiO 2 particles doped with Ni 2+, Al 3+, Nb 5+, and Ta 5+ by hydrothermal synthesis as anode materials for Na-ion batteries and investigated the effect of doping cation valence on the anode performance and the Na + diffusion behavior. In situ X-ray diffraction analyses confirmed the insertion and extraction of Na + while maintaining the rutile structure. Among the various doped TiO 2 electrodes, the Ni-doped TiO 2 one exhibited the best anode performance with a high reversible capacity of 135 mA h g –1 even at 50 C (16.75 A g –1 ). This electrode showed a very long cycle life: the capacity of 225 mA h g –1 could be attained even after 10,000 cycles. The first-principles calculation suggested the formation of impurity levels in the forbidden band of TiO 2 by various cation dopings. Electrochemical impedance analyses revealed that the Ni-doped TiO 2 electrode showed lower charge-transfer resistance ( R ct ) compared with other cation-doped TiO 2 electrodes. Measurements using the galvanostatic intermittent titration technique found that the Na + diffusion coefficient ( D Na+ ) of Ni-doped TiO 2 has a higher value of 1.2 × 10 –13 cm 2 s –1 compared with D Na+ of 4.8 × 10 –14 cm 2 s –1 in the case of undoped TiO 2 . The first-principle calculation supported this result: the Ni 2+ doping could reduce the activation energy required for Na + diffusion in rutile TiO 2 . Therefore, we suggest that an easier migration of Na + was promoted in the Ni-doped TiO 2, effectively enhancing the charge–discharge capacity and the cycle life. Although rutile TiO 2 as an anode has had a difficult history, this study proved that impurity element doping such as Ni 2+ can transform it into a very attractive anode material.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Nickel-Doped Titanium Oxide with the Rutile Structure for High-Performance Sodium Storage
- Date Crossref
- 18/03/2025
- Éditeur
- American Chemical Society (ACS)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Tottori University Center for Research on Green Sustainable Chemistry pays non établi dans la noticeUniversité ou école supérieure
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National Institute for Fusion Science Plasma Quantum Process Unit pays non établi dans la noticeStructure de recherche
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Tottori Institute of Industrial Technology pays non établi dans la noticeStructure de recherche
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Graduate School of Engineering Department of Chemistry and Biotechnology pays non établi dans la noticeUniversité ou école supérieure
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Graduate School of Sustainability Science Department of Engineering pays non établi dans la noticeUniversité ou école supérieure
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Mechanical and Material Research Laboratory pays non établi dans la noticeStructure de recherche
Center for Research on Green Sustainable Chemistry — Tottori University, Plasma Quantum Process Unit — National Institute for Fusion Science et Tottori Institute of Industrial Technology, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.