Details

Autor(en) / Beteiligte

• Shi, Xiancheng
• Sun, Li
• Li, Xiaowei
• Wu, Lin
• Qian, Jialong
• Wang, Jinglong
• Lin, Yifan
• Su, Shengwang
• Sun, Chao
• Zhang, Yuanxing
• Zhang, Yihe

Titel

High-performance flexible supercapacitor enabled by Polypyrrole-coated NiCoP@CNT electrode for wearable devices

Ist Teil von

• Journal of colloid and interface science, 2022-01, Vol.606, p.135-147

Ort / Verlag

Elsevier Inc

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• The flexible ASC device with NCP@CNT10@PPy6 as the cathode and AC as the anode shows excellent electrochemical performance and great application potentials in heat-resistant storage energy systems and portable wearable devices. [Display omitted] •DFT calculation confirms the combination of Ni and Co is conducive to rapid electron transfer.•Carboxylic carbon nanotubes are used to load nickel-cobalt bimetallic phosphide, and polypyrrole is further coated on the surface to accelerate electron transfer and maintain a stable structure.•The NCP@CNT10@PPy6 delivers high specific capacitance, high rate performance and excellent cycle stability.•A flexible supercapacitor device is synthesized based on NCP@CNT10@PPy6 and possesses a stable working state under a wide range of operating temperatures and bending angles. As a pseudocapacitive electrode material, nickel–cobalt bimetallic phosphide has attracted wide attention with its advantage in capacitance and chemical activity. While, like Ni-Co oxides or sulfides, the application of nickel–cobalt bimetallic phosphide is generally hampered by its confined conductivity, low chemical stability and unsatisfactory cycle durability. Herein, this work demonstrates a NiCoP@CNT@PPy (NCP@CNT@PPy) composite that is obtained by polymerizing pyrrole monomer on the surface of NiCoP@CNT complex. According to density functional theory (DFT), it is theoretically demonstrated that the bimetallic Ni-Co phosphide (NiCoP) can exhibit more electrons near the Fermi level than single Ni or Co phosphide. Under the combined effects of carboxylic carbon nanotubes (c-CNTs) and polypyrrole (PPy), the NCP@CNT@PPy electrode exhibits excellent electrochemical performance. In addition, a flexible asymmetric supercapacitor (ASC) is prepared, which demonstrated high energy density and admirable heat-resistance and flexibility performance, showing huge potential in the application of heat-resistant storage energy systems and portable wearable devices.