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A dual heterostructure enables the stabilization of 1T-rich MoSe₂ for enhanced storage of sodium ions.

ABSTRACT: Electron injection effectively induces the formation of a 1T-rich phase to address the low conductivity of MoSe₂. Nevertheless, overcoming the inherent metastability of the 1T phase (particularly during the conversion reactions that entail the decomposition-reconstruction of MoSe₂ and volume expansion) remains a challenge. Guided by DFT results, we designed a composite with bimetal selenides-based heterostructures anchored on reduced graphene oxide (rGO) nanosheets (G-Cu₂Se@MoSe₂) to obtain stabilized 1T-rich MoSe₂ and enhanced ion transfer. The construction of 1T-rich MoSe₂ and built-in electric fields (BiEF) through electron transfer at the heterointerfaces were realized. Moreover, the rGO-metal selenides heterostructures with in situ-formed interfacial bonds could facilitate the reconstruction of the 1T-rich MoSe₂-involved heterostructure and interfacial BiEF. Such a dual heterostructure endowed G-Cu₂Se@MoSe₂ with an excellent rate capability with a capacity of 288 mA h g^-1 at 50 A g^-1 and superior cycling stability with a capacity retention ratio of 89.6% (291 mA h g^-1) after 15 000 cycles at 10 A g^-1. Insights into the functional mechanism and structural evolution of the 1T MoSe₂-involved dual heterostructure from this work may provide guidelines for the development of MoSe₂ and phase-engineering strategies for other polymorphistic materials.

SUBMITTER: Chao Y

PROVIDER: S-EPMC11253150 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature

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A dual heterostructure enables the stabilization of 1T-rich MoSe2 for enhanced storage of sodium ions.

Chao Yunfeng Y Jia Shenghui S Li Jinzhao J Chen Guohui G Liu Lu L Tang Fei F Zhu Jianhua J Wang Caiyun C Cui Xinwei X

Chemical science 20240606 28

Electron injection effectively induces the formation of a 1T-rich phase to address the low conductivity of MoSe2. Nevertheless, overcoming the inherent metastability of the 1T phase (particularly during the conversion reactions that entail the decomposition-reconstruction of MoSe2 and volume expansion) remains a challenge. Guided by DFT results, we designed a composite with bimetal selenides-based heterostructures anchored on reduced graphene oxide (rGO) nanosheets (G-Cu<su ...[more]

PMID: 39027283

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Project description:Nanoparticle aggregation of supported metal catalysts at high temperatures is a serious problem that causes a drop in catalytic performance. This study investigates the protection of metal nanoparticles from sintering by selectively forming nanoscale SiO2 shells on Pd supported on TiO2 by ultraviolet (UV) light irradiation. The proton-coupled reduction reaction increases the local pH around Pd nanoparticles, resulting in hydrolysis of tetraethoxyorthosilicate (TEOS) in only the vicinity of the metal. An apparent quantum efficiency of only 0.6% is obtained for the Pd/TiO2 catalyst in H2 evolution from ethanol-containing water under 370 nm excitation light. Therefore, the pH of raw slurry solution should be precisely controlled to that slightly below the threshold value for the TEOS hydrolysis reaction before the photodeposition. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) clearly show that the particle size of the Pd nanoparticles (∼40 nm) with the SiO2 shell (∼20 nm) was almost unchanged by the high-temperature treatment at 900 °C in air, suggesting that the SiO2 shell prevented thermal aggregation of Pd nanoparticles. The Pd/TiO2 without SiO2 shell decoration exhibited a drop in the number of active sites, which was likely due to aggregation of the Pd catalysts. However, the number of active sites on the Pd@SiO2/TiO2 catalyst was maintained even after the catalyst was calcined at 900 °C. Consequently, the Pd@SiO2/TiO2 catalyst maintained its catalytic performance for simulated exhaust gas purification even after treatment at 900 °C. This study presents a methodology to produce sintering-tolerant supported metal nanoparticles using the photocatalytic gas permeable layer fabrication method. This paper presents a new methodology to produce a sintering-resistant exhaust gas purification catalyst with ultrathin SiO2 decoration on already supported Pd metal nanoparticles using a vacuum-free photocatalytic layer deposition method.

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A dual heterostructure enables the stabilization of 1T-rich MoSe₂ for enhanced storage of sodium ions.

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A dual heterostructure enables the stabilization of 1T-rich MoSe<sub>2</sub> for enhanced storage of sodium ions.

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