1. Unveiling the role of Atomic-Level "Pump-Driven" effect in MoS2/MnO2 for facilitating directional charge transfer in hybrid capacitive deionization.
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Yao, Shuyun, Wang, Dewei, Fu, Weijie, Gao, Xueying, Wang, Shiyu, Liu, Yuanming, Hou, Zishan, Wang, Jinrui, Nie, Kaiqi, Xie, Jiangzhou, Yang, Zhiyu, and Yan, Yi-Ming
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DEIONIZATION of water , *TRANSITION metal oxides , *MATERIALS science , *CHARGE exchange , *MANGANESE dioxide , *ELECTRIC fields , *IONIC conductivity - Abstract
We elucidate the successful harnessing of the atomistic "pump-driven" effect to engineer a potent internal electric field (IEF) within transition metal oxides (TMOs). This IEF acts as a dynamic catalyst for charge transfer, significantly bolstering reaction kinetics and, consequently, augmenting the efficacy of hybrid capacitive deionization (HCDI) systems. [Display omitted] • Successful synthesis of the MoS 2 @MnO 2 heterostructure. • Atomic-level "pump-driven" effect induces a strong inherent electric field. • Meticulous design enhances directional electron transfer and charge efficiency. • Enhanced desalination capacity and rate compared to pristine MnO 2. • Leveraging empirical and computational insights enriches understanding. In addressing the limitations imposed by the inherently low electronic conductivity and substantial ion transfer resistance of transition metal oxides (TMOs) in hybrid capacitive deionization (HCDI) applications, this study delineates a pioneering approach through the fabrication of a MoS 2 /MnO 2 heterostructure, leveraging manganese dioxide (MnO 2) as a model system. The investigation underscores the essentiality of constructing high-quality interfaces to act as conduits for directional charge flow, a critical but formidable challenge for enhancing desalination efficacy in electrode materials. By harnessing an atomistic "pump-driven" mechanism, the MoS 2 /MnO 2 heterostructure demonstrably facilitates the promotion of desalination processes, underscored by the establishment of a potent local electric field (IEF) aimed at commanding charge dynamics. Empirical and computational analyses coalesce to unveil the preferential electron transfer from MoS 2 to MnO 2 , a phenomenon precipitated by charge redistribution. This orchestrated charge flow not only augments electronic and ionic transfer efficiencies but also emboldens the MoS 2 /MnO 2 heterostructure with enhanced desalination capabilities. The results show that MoS 2 /MnO 2 demonstrates superior HCDI performance compared to MnO 2 in a 500 mg L-1 NaCl solution at 1.2 V, with SRC of 33.21 mg g-1 and SRR of 1.50 mg g-1 min-1. The elucidation of this charge-guided dynamic, achieved through meticulous manipulation of the electronic microstructure and the IEF at the atomic scale, presents a novel paradigm for material science. This research presents an innovative approach for realizing robust charge-guided dynamics through the deliberate manipulation of the electronic microstructure and IEF of materials, employing an atomic-level "pump-driven" effect. This strategy opens new avenues for extending these principles to a broad array of advanced materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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