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Hierarchical Heterostructure Engineering of Layered Double Hydroxides on Nickel Sulfides Heteronanowire Arrays as Efficient Cathode for Alkaline Aqueous Zinc Batteries
Small ( IF 13.0 ) Pub Date : 2022-07-30 , DOI: 10.1002/smll.202202799
Kai Zhou 1 , Shuai Wang 1 , Guixiang Zhong 1 , Jingrong Chen 1 , Yu Bao 1 , Li Niu 1
Affiliation  

Aqueous alkaline rechargeable nickel-zinc (Ni–Zn) batteries possess great potential for large-scale energy storage systems because of their high output voltage, cheap cost, and intrinsic safety. However, the practical applicability of Ni–Zn batteries has been limited by traditional Ni-based cathodes with low capacity and poor cycle stability. Rational design of electrode structure and composition is highly desired but still significantly challenging. Herein, uniform self-supported hierarchical heterostructure composites interacting NiCo-layered double hydroxide with 1D nickel sulfides heteronanowire rooted on Ni foam (NF\Ni3S2/NiS@NiCo-LDH) are successfully developed by a hydrothermal sulfurization-electrodeposition process. The self-supported 3D hierarchical heterostructured composites nanoarray provides abundant reactive sites, rapid ion diffusion channels, and fast electron transfer routes, as well as strong structural stability. More significantly, the strong interfacial charge transfer between Ni3S2/NiS heteronanowire and NiCo-LDH effectively modifies the electronic structure of the composites and thereby improving the reaction kinetics. Consequently, the NF\Ni3S2/NiS@NiCo-LDH electrode presents a superior capacity of 434.5 mAh g−1 (1.73 mAh cm−2) at 3 mA cm−2. In addition, the fabricated NF\Ni3S2/NiS@NiCo-LDH//Zn battery can offer a maximal energy density and power density as large as 556.3 Wh kg−1 and 26.3 kW kg−1, respectively, as well as an exceptional cycling performance.

中文翻译:

硫化镍异质纳米线阵列上层状双氢氧化物的分层异质结构工程作为碱性水系锌电池的高效阴极

水性碱性可充电镍锌(Ni-Zn)电池由于其输出电压高、成本低廉和本质安全等优点,在大规模储能系统中具有巨大的潜力。然而,传统的镍基正极容量低、循环稳定性差,限制了镍锌电池的实际应用。电极结构和组成的合理设计是非常需要的,但仍然具有很大的挑战性。在此,均匀的自支撑分级异质结构复合材料与 NiCo 层状双氢氧化物与根在泡沫镍上的一维硫化镍异质纳米线相互作用 (NF\Ni 3 S 2/NiS@NiCo-LDH) 是通过水热硫化-电沉积工艺成功开发的。自支撑的3D分层异质结构复合材料纳米阵列提供了丰富的反应位点、快速的离子扩散通道和快速的电子转移路径,以及很强的结构稳定性。更重要的是,Ni 3 S 2 /NiS异质纳米线和NiCo-LDH之间的强界面电荷转移有效地改变了复合材料的电子结构,从而改善了反应动力学。因此,NF\Ni 3 S 2 /NiS@NiCo-LDH 电极在 3 mA cm -2时具有 434.5 mAh g -1 (1.73 mAh cm -2 ) 的优异容量. 此外,制造的NF\Ni 3 S 2 /NiS@NiCo-LDH//Zn电池可以提供最大能量密度和功率密度分别高达556.3 Wh kg -1和26.3 kW kg -1,以及出色的骑行性能。
更新日期:2022-07-30
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