Controllable Heterojunctions with a Semicoherent Phase Boundary Boosting the Potassium Storage of CoSe<sub>2</sub> /FeSe<sub>2</sub>.
basic_science · Level V
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- Also identified by DOI 10.1002/adma.202102471.
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Abstract
Heterostructure construction is an efficient method for reinforcing K<sup>+</sup> storage of transition metal selenides. The spontaneously developed internal electric fields give a strong boost to charge transport and significantly reduce the activation energy. Nevertheless, perfection of the interfacial region based on the energy level gradient and lattice matching degree is still a great challenge. Herein, rich vacancies and ultrafine CoSe<sub>2</sub> -FeSe<sub>2</sub> heterojunctions with semicoherent phase boundary are simultaneously obtained, which possess unique electronic structures and abundant active sites. When employed as anodes for potassium-ion batteries (PIBs), CoSe<sub>2</sub> -FeSe<sub>2</sub> @C composites display a reversible potassium storage of 401.1 mAh g<sup>-1</sup> at 100 mA g<sup>-1</sup> and even 275 mAh g<sup>-1</sup> at 2 A g<sup>-1</sup> . Theoretical calculation also reveals that the potassium-ion diffusion can be dramatically promoted by the controllable CoSe<sub>2</sub> -FeSe<sub>2</sub> heterojunction.