Highly stable energy-storage performance of donor-acceptor co-doped TiO2 films

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2024-07-09 DOI:10.1016/j.materresbull.2024.112993

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Abstract

Energy-storage films that remain stable at high temperatures and frequencies are crucial for various applications. In this study, we demonstrated that donor-acceptor co-doped simple oxide TiO₂ films, viz. V⁵⁺-Cr³⁺ co-doped TiO₂ [(V_0.5Cr_0.5)_xTi_1-_xO₂] films, can exhibit highly stable energy-storage performance. The co-doped TiO₂ films exhibited high breakdown strength and polarization owing to the local polarization induced by the V⁵⁺-Cr³⁺ ionic pairs. The energy-storage density of the (V_0.5Cr_0.5)_0.02Ti_0.98O₂ film was approximately 48.93 J/cm³ at room temperature, which is approximately 195 times higher than that of the pure TiO₂ film (0.25 J/cm³). In addition, the (V_0.5Cr_0.5)_0.02Ti_0.98O₂ film exhibited excellent temperature stability from 303 K to 403 K, frequency stability from 0.5 kHz to 7.5 kHz, and fatigue durability over 10⁷ charge-discharge cycles. The proposed strategy can effectively improve the stable energy-storage performance of lead-free donor-acceptor co-doped TiO₂ films, which are in high demand in various applications.

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供体-受体共掺杂二氧化钛薄膜的高稳定储能性能

在高温和高频条件下保持稳定的储能薄膜对各种应用都至关重要。在这项研究中，我们证明了供体-受体共掺杂简单氧化物 TiO 薄膜，即 V-Cr 共掺杂 TiO [(VCr)TiO] 薄膜，可以表现出高度稳定的储能性能。由于 V-Cr 离子对引起的局部极化，共掺杂 TiO 薄膜表现出较高的击穿强度和极化。室温下，(VCr)TiO 薄膜的储能密度约为 48.93 J/cm，是纯 TiO 薄膜（0.25 J/cm）的约 195 倍。此外，(VCr)TiO 薄膜在 303 K 至 403 K 的温度稳定性、0.5 kHz 至 7.5 kHz 的频率稳定性以及 10 次充放电循环的疲劳耐久性方面均表现优异。所提出的策略能有效提高无铅供体-受体共掺杂 TiO 薄膜的稳定储能性能，而这种薄膜在各种应用中都有很高的需求。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.