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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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