Extrinsic pseudocapacitive ultrathin 2D MoS2 nanoflakes clamped on 1D Sb2S3 nanorods: an advanced heterostructured anode for high-energy ammonium ion hybrid capacitors

Supriya J. Marje, Harshitha B. Tyagaraj, Seung Kyu Hwang, Kugalur Shanmugam Ranjith, Ebrahim Alhajri, Nilesh R. Chodankar, Yun Suk Huh, Young Kyu Han

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    Abstract

    Ammonium-ion (NH4+) charge carriers have recently been considered promising for electrochemical energy storage (EES) systems because of their high safety, low molar mass, and small hydrated radius (3.31 Å). However, finding a kinetically balanced anode and cathode combination for high NH4+-ion storage is challenging. Herein, a new approach for developing a heterostructured electrode was developed by constructing extrinsic pseudocapacitive 2D ultrathin MoS2 nanoflakes clamped on 1D Sb2S3 nanorods (MoS2/Sb2S3) as an anode for high-performance ammonium-ion hybrid capacitors (AIHCs) against the intrinsic pseudocapacitive MnO2 cathode. The engineered MoS2/Sb2S3 heterostructured anode facilitated large interlayer galleries owing to the presence of 2D MoS2 for facial NH4+-ion diffusion and provided a rapid electron pathway through 1D Sb2S3, which promoted a high capacitance of 360 F g−1, low resistance, and stable cycling performance. More importantly, the constructed AIHC delivered a superior energy density of 43.75 W h kg−1 at a power density of 600 W kg−1 and excellent cycling durability over 5000 cycles. These results show that a heterostructured extrinsic pseudocapacitive anode can improve the electrochemical parameters of NH4+ EES systems and replace traditional carbon-based anode materials.

    Original languageBritish English
    JournalJournal of Materials Chemistry A
    DOIs
    StateAccepted/In press - 2024

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