Synthesis of V2O5 Nanoribbon–Reduced Graphene Oxide Hybrids as Stable Aqueous Zinc-Ion Battery Cathodes via Divalent Transition Metal Cation-Mediated Coprecipitation,ACS Sustainable Chemistry & Engineering

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Synthesis of V2O5 Nanoribbon–Reduced Graphene Oxide Hybrids as Stable Aqueous Zinc-Ion Battery Cathodes via Divalent Transition Metal Cation-Mediated Coprecipitation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-01-30 , DOI: 10.1021/acssuschemeng.2c07629
Kamalambika Muthukumar ₁ , Sabari Rajendran ₁ , Archana Sekar ₁ , Ya Chen ₂ , Jun Li ₁

Affiliation

Aqueous zinc-ion batteries (AZIBs) are an emerging sustainable and safer technology for large-scale electrical energy storage. Here, we report the synthesis of hybrid materials consisting of V₂O₅ nanoribbons (NRs) and reduced graphene oxide (rGO) nanosheets as AZIB cathode materials by divalent metal cation-mediated coprecipitation. The divalent metal ions M²⁺ (Zn²⁺ and Mn²⁺) effectively neutralize the negative charges on the surface of microwave-exfoliated crystalline V₂O₅ NRs and graphene oxide (GO) nanosheets to form a strongly bound assembly. After thermal annealing in a nitrogen atmosphere, GO is converted into rGO with higher electrical conductivity while the layers in V₂O₅ NRs are expanded by M²⁺ intercalation. When only Zn²⁺ ions are used during coprecipitation, the produced Zn-V₂O₅ NR/rGO hybrid shows a very high reversible specific capacity of ∼395 mAh g^–1 at 0.50 A g^–1 but suffers from poor stability. This is improved by mixing Mn²⁺ with Zn²⁺ ions during coprecipitation. The (Mn + Zn)-V₂O₅ NR/rGO hybrid shows a slightly lower specific capacity of ∼291 mAh g^–1 at 0.5 A g^–1 but a substantially improved long-cycling stability and better rate performance due to the stronger binding of Mn atoms in the V₂O₅ host that serve as stable pillars to support the expanded V₂O₅ layers.

中文翻译：

通过二价过渡金属阳离子介导的共沉淀法合成 V2O5 纳米带-还原氧化石墨烯杂化物作为稳定的水系锌离子电池阴极

水系锌离子电池 (AZIB) 是一种新兴的可持续且更安全的大规模电能存储技术。在这里，我们报告了通过二价金属阳离子介导的共沉淀法合成由 V ₂ O ₅纳米带 (NRs) 和还原氧化石墨烯 (rGO) 纳米片组成的混合材料作为 AZIB 阴极材料。二价金属离子M ²⁺（Zn ²⁺和Mn ^{2+ ）有效地中和了微波剥离结晶V}₂ O ₅表面的负电荷NR 和氧化石墨烯 (GO) 纳米片形成强结合的组装体。在氮气气氛中热退火后，GO 转化为具有更高电导率的 rGO，而 V ₂ O ₅ NRs 中的层通过 M ²⁺嵌入而膨胀。当在共沉淀过程中仅使用 Zn ²⁺离子时，生成的 Zn-V ₂ O ₅ NR/rGO 杂化物在 0.50 A g ^{–1时显示出非常高的可逆比容量，约为 395 mAh g}^–1 ，但稳定性较差。^{这可以通过在共沉淀过程中将 Mn 2+}与 Zn ²⁺离子混合来改善。(Mn+Zn)-V ₂ O ₅NR/rGO 杂化物在 0.5 A g ^{–1时的比容量略低，约为 291 mAh g}^{–1 ，但由于 V}₂ O ₅主体中 Mn 原子的结合更强，因此长循环稳定性和倍率性能得到显着改善作为稳定的支柱来支撑扩展的 V ₂ O ₅层。

更新日期：2023-01-30

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