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The Jahn-Teller Effect for Amorphization of Molybdenum Trioxide towards High-Performance Fiber Supercapacitor.

ABSTRACT: Amorphous pseudocapacitive nanomaterials are highly desired in energy storage applications for their disordered crystal structures, fast electrochemical dynamics, and outstanding cyclic stability, yet hardly achievable using the state-of-the-art synthetic strategies. Herein, for the first time, high capacitive fiber electrodes embedded with nanosized amorphous molybdenum trioxide (A-MoO_3-x) featuring an average particle diameter of ~20 nm and rich oxygen vacancies are obtained via a top-down method using α-MoO₃ bulk belts as the precursors. The Jahn-Teller distortion in MoO₆ octahedra due to the doubly degenerate ground state of Mo⁵⁺, which can be continuously strengthened by oxygen vacancies, triggers the phase transformation of α-MoO₃ bulk belts (up to 30 μm long and 500 nm wide). The optimized fibrous electrode exhibits among the highest volumetric performance with a specific capacitance (C _V ) of 921.5 F cm^-3 under 0.3 A cm^-3, endowing the fiber-based weaveable supercapacitor superior C _V and E _V (energy density) of 107.0 F cm^-3 and 9.5 mWh cm^-3, respectively, together with excellent cyclic stability, mechanical robustness, and rate capability. This work demonstrates a promising strategy for synthesizing nanosized amorphous materials in a scalable, cost-effective, and controllable manner.

SUBMITTER: Yu C

PROVIDER: S-EPMC8025085 | biostudies-literature |

REPOSITORIES: biostudies-literature

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