Photoinduced decoration of NiO nanosheets/Ni foam with Pd nanoparticles towards a carbon-free and self-standing cathode for a lithium–oxygen battery with a low overpotential and long cycle life†,Materials Horizons

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Photoinduced decoration of NiO nanosheets/Ni foam with Pd nanoparticles towards a carbon-free and self-standing cathode for a lithium–oxygen battery with a low overpotential and long cycle life†
Materials Horizons ( IF 12.2 ) Pub Date : 2018-01-25 00:00:00 , DOI: 10.1039/c7mh01014a
Fan-Lu Meng _{1,

2,

3,

4,

5} , Zhi-wen Chang _{1,

2,

3,

4,

5} , Ji-jing Xu _{1,

2,

3,

4,

5} , Xin-bo Zhang _{1,

2,

3,

4,

5} , Jun-min Yan _{6,

7,

8,

9,

10}

Affiliation

Constructing an air electrode with a porous structure and tunable chemical composition can provide a solution to improve the performances of Li–O₂ batteries. Herein, via a facile synthesis strategy by combining electrodeposition and photoreduction, we have fabricated a free-standing cathode with palladium (Pd)-modified NiO nanosheets (NS) grown on Ni foam (PNS). The Li–O₂ battery with the PNS cathode delivers a high capacity (18 900 mA h g⁻¹ at 200 mA g⁻¹), a much reduced charge overpotential (∼0.35 V), and a long-term cycling life (103 cycles at 200 mA g⁻¹ and 1000 mA h g⁻¹). These properties are due to the good activity of NiO/Pd catalyst, the highly porous structure of NiO nanosheets, and the absence of an organic binder. More importantly, film-like Li₂O₂ is formed via a surface growth pathway in the PNS cathode, providing a large contact area between the Li₂O₂ and cathode surfaces. As a benefit, the electron transfer during the charge process is facilitated, contributing to a much reduced charge overpotential.

中文翻译：

NiO纳米片/ Ni泡沫与Pd纳米粒子的光诱导装饰朝向无碳且自立的阴极，用于锂-氧电池，其低电势低且循环寿命长†

构建具有多孔结构和可调化学成分的空气电极可以提供一种改善Li–O ₂电池性能的解决方案。在这里，通过结合电沉积和光还原的简便合成策略，我们制造了一个独立的阴极，并在镍泡沫（PNS）上生长了钯（Pd）改性的NiO纳米片（NS）。锂-O ₂电池与PNS阴极提供了一个大容量（18900毫安汞柱^-1以200mA克^-1），一个多电荷降低的超电势（~0.35 V），和一个长期的循环寿命（103次循环在200 mA g ^-1和1000 mA hg ^-1时）。这些性质归因于NiO / Pd催化剂的良好活性，NiO纳米片的高度多孔结构以及不存在有机粘合剂。更重要的是，通过PNS阴极中的表面生长路径形成膜状的Li ₂ O ₂，从而在Li ₂ O ₂与阴极表面之间提供大的接触面积。有益的是，在充电过程中促进了电子转移，从而大大降低了电荷超电势。

更新日期：2018-01-25

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