The interfacial engineering via surface amorphization is an effective strategy to regulate the structure and character of material. Herein, a facile hydrothermal method followed by NaBH treatment is proposed to fabricate surface-amorphized CoS (SA-CoS). XRD and SEM characterization implies the micro flower structure of CoS. TEM test further demonstrates the heterointerface between crystal CoS core and defect-rich amorphous CoS surface, which can reduce electron/ion transport path and accelerate internal charge transfer rate, thus enhancing the integral electrical conductivity. Electrochemical measurements imply that the SA-CoS displays satisfying specific capacitance of 1043.9 F g at 0.5 A g and good rate performance. By employing SA-CoS as a cathode, and active carbon as an anode, the asymmetric supercapacitor exhibits a high energy density of 41.9 Wh kg at a power density of 162 W kg and good cycling durability (above 90 % retention rate after 10,000 cycles). This work offers a novel structure design strategy for fabricating cobalt sulfide materials with high conductivity and electrochemical performances.

中文翻译：

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表面非晶化 Co3S4 作为超级电容器坚固阴极的增强循环性能

通过表面非晶化进行界面工程是调节材料结构和特性的有效策略。在此，提出了一种简便的水热法，然后进行 NaBH 处理来制造表面非晶化 CoS（SA-CoS）。 XRD 和 SEM 表征表明 CoS 的微花结构。 TEM测试进一步证明了晶体CoS核心与富含缺陷的非晶CoS表面之间的异质界面，该异质界面可以减少电子/离子传输路径并加速内部电荷传输速率，从而增强整体电导率。电化学测量表明 SA-CoS 在 0.5 A g-1 下表现出满足 1043.9 F g 的比电容和良好的倍率性能。采用SA-CoS作为阴极，活性炭作为阳极，非对称超级电容器在162 W kg的功率密度下表现出41.9 Wh kg的高能量密度和良好的循环耐久性（10,000次循环后保持率高于90%） 。这项工作为制造具有高导电性和电化学性能的硫化钴材料提供了一种新颖的结构设计策略。