Atomic‐Level Coupled Interfaces and Lattice Distortion on CuS/NiS2 Nanocrystals Boost Oxygen Catalysis for Flexible Zn‐Air Batteries,Advanced Functional Materials

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Atomic‐Level Coupled Interfaces and Lattice Distortion on CuS/NiS2 Nanocrystals Boost Oxygen Catalysis for Flexible Zn‐Air Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-09-08 , DOI: 10.1002/adfm.201703779
Li An ₁ , Yuxuan Li ₁ , Mingchuan Luo _{2,

3} , Jie Yin ₁ , Yong-Qing Zhao ₁ , Cailing Xu ₁ , Fangyi Cheng ₄ , Ying Yang ₁ , Pinxian Xi ₁ , Shaojun Guo _{2,

3}

Affiliation

The exploration of highly efficient nonprecious metal bifunctional electrocatalysts to boost oxygen evolution reaction and oxygen reduction reaction is critical for development of high energy density metal‐air batteries. Herein, a class of CuS/NiS₂ interface nanocrystals (INs) catalysts with atomic‐level coupled nanointerface, subtle lattice distortion, and plentiful vacancy defects is reported. The results from temperature‐dependent in situ synchrotron‐based X‐ray absorption fine spectroscopy and electron spin resonance spectroscopy demonstrate that the lattice distortion of 14.7% in CuS/NiS₂ caused by the strong Jahn–Teller effect of Cu, the strong atomic‐level coupled interface of CuS and NiS₂ domains, and distinct vacancy defects can provide numerous effective active sites for their excellent bifunctional performance. A liquid Zn‐air battery with the CuS/NiS₂ INs as air electrode displays a large peak power density (172.4 mW cm⁻²), a high specific capacity (775 mAh g_Zn⁻¹), and long cycle life (up to 83 h), making the CuS/NiS₂ INs among the best bifunctional catalysts for Zn‐air battery. More remarkably, the flexible CuS/NiS₂ INs‐based solid‐state Zn‐air batteries can power the LED after twisting, making them be promising in portable and wearable electronic devices.

中文翻译：

CuS / NiS2纳米晶体上的原子级耦合界面和晶格畸变增强了柔性Zn-空气电池的氧催化作用

探索高效的非贵金属双功能电催化剂以促进氧释放反应和氧还原反应对于开发高能量密度金属空气电池至关重要。本文报道了一类具有原子级偶联纳米界面，细微晶格畸变和大量空位缺陷的CuS / NiS ₂界面纳米晶体（INs）催化剂。基于温度的原位基于同步加速器的X射线吸收精细光谱和电子自旋共振光谱的结果表明，CuS / NiS ₂的14.7％晶格畸变是由Cu的强Jahn-Teller效应引起的，Cu是强原子的。 CuS和NiS _2的液位耦合界面区域和明显的空位缺陷可以为其出色的双功能性能提供大量有效的活性位点。以CuS / NiS ₂ INs作为空气电极的液态Zn-空气电池显示出大的峰值功率密度（172.4 mW cm ^-2），高的比容量（775 mAh g _Zn^-1）和长的循环寿命（高达83 h），使CuS / NiS ₂ INs成为用于锌空气电池的最佳双功能催化剂之一。更引人注目的是，基于CuS / NiS ₂ INs的柔性固态Zn-air固态电池可在扭曲后为LED供电，使其在便携式和可穿戴电子设备中很有前途。

更新日期：2017-09-08

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