Hydrogen storage in incompletely etched multilayer Ti2CTx at room temperature

Liu, Shiyuan; Liu, Jieyuan; Liu, Xiaofang; Shang, Jia‐Xiang; Li, Xu; Yu, Ronghai; Shui, Jianglan

doi:10.1038/s41565-020-00818-8

Cited by 202 publications

(87 citation statements)

References 45 publications

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“…However, Fourier transform infrared (FT‐IR) spectra show that H@FeNC has much fewer oxygen‐containing groups and more CH and NH bonds than FeNC in the regions of 3100–3600 and 900–1500 cm –1 (Figure 1c), indicating that the hydrogen passivation reduced the oxygen and grafted hydrogen onto the catalyst surface. [ 13 ] The hydrogenation also enhances the hydrophobicity of the catalyst as verified by the dispersibility of catalyst powder in water. FeNC powder can be wetted and completely submerge into the water in a short time; while H@FeNC is relatively difficult to be wetted, and some powder remain floating on the water surface (Figure 1d).…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Passivation of M–N–C (M = Fe, Co) Catalysts for Storage Stability and ORR Activity Improvements

et al. 2021

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M–N–C (M = Fe, Co) are highly active nonprecious metal electrocatalysts for the oxygen reduction reaction (ORR) and other applications. Although their operation stability has been extensively studied in proton‐exchange‐membrane fuel cells, the storage stability that determines the performance maintenance before use has not yet been understood. Here, it is found that long‐term exposure of M–N–C catalysts in air would cause surface oxidation and hydroxylation, resulting in significant decrease of ORR activity and fuel‐cell performances. Hydrogen passivation is demonstrated to be an effective strategy to protect the atomic M–N4 active sites and improve the storage stability of the catalysts. In addition, the hydrogen‐termination can also reduce the ORR energy barrier and increase the utilization of active sites, leading to the improvements of fuel‐cell activity and power density. Notably, these findings help to understand the storage‐associated degradation and protection of M–N–C catalysts.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Passivation of M–N–C (M = Fe, Co) Catalysts for Storage Stability and ORR Activity Improvements

et al. 2021

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“…However, the current hydrogen storage materials still not very well satisfy the industrial requirement. Due to the higher surface activity and larger surface area, recently, the hydrogen storage performance of the incomplete etched Ti 2 CT x MXene film has been investigated, and the hydrogen storage mechanism has been discussed [221]. It was found that the Ti 2 CT x film has excellent hydrogen storage efficiency, where 8.8 wt% hydrogen is completely absorbed at room temperature under the environment of 60 bar H 2 .…”

Section: Other Potential Applicationsmentioning

confidence: 99%

Recent Progress in Emerging Two-Dimensional Transition Metal Carbides

et al. 2021

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As a new member in two-dimensional materials family, transition metal carbides (TMCs) have many excellent properties, such as chemical stability, in-plane anisotropy, high conductivity and flexibility, and remarkable energy conversation efficiency, which predispose them for promising applications as transparent electrode, flexible electronics, broadband photodetectors and battery electrodes. However, up to now, their device applications are in the early stage, especially because their controllable synthesis is still a great challenge. This review systematically summarized the state-of-the-art research in this rapidly developing field with particular focus on structure, property, synthesis and applicability of TMCs. Finally, the current challenges and future perspectives are outlined for the application of 2D TMCs.

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“…MAX phases are ternary transition-metal carbides and nitrides with a formula of M n + 1 AX n , where M is a transition metal, A is an A-group element and X is carbon or nitrogen 1 . MXenes derived from MAX phase precursors have attracted great interest in many fields, including electrochemical energy storage 2 , 3 , electromagnetic interference (EMI) shielding 4 , superconductors 5 , and others 6 , 7 . Since the first report of Ti 3 C 2 T x synthesis in 2011 8 , MXenes have typically been prepared from selectively etching MAX phase precursors.…”

Section: Introductionmentioning

confidence: 99%

Li-ion storage properties of two-dimensional titanium-carbide synthesized via fast one-pot method in air atmosphere

Shao

et al. 2021

Nat Commun

127

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Structural bidimensional transition-metal carbides and/or nitrides (MXenes) have drawn the attention of the material science research community thanks to their unique physical-chemical properties. However, a facile and cost-effective synthesis of MXenes has not yet been reported. Here, using elemental precursors, we report a method for MXene synthesis via titanium aluminium carbide formation and subsequent in situ etching in one molten salt pot. The molten salts act as the reaction medium and prevent the oxidation of the reactants during the high-temperature synthesis process, thus enabling the synthesis of MXenes in an air environment without using inert gas protection. Cl-terminated Ti3C2Tx and Ti2CTx MXenes are prepared using this one-pot synthetic method, where the in situ etching step at 700 °C requires only approximately 10 mins. Furthermore, when used as an active material for nonaqueous Li-ion storage in a half-cell configuration, the obtained Ti2CTx MXene exhibits lithiation capacity values of approximately 280 mAh g−1 and 160 mAh g−1 at specific currents of 0.1 A g−1 and 2 A g−1, respectively.

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Hydrogen storage in incompletely etched multilayer Ti2CTx at room temperature

Cited by 202 publications

References 45 publications

Hydrogen Passivation of M–N–C (M = Fe, Co) Catalysts for Storage Stability and ORR Activity Improvements

Hydrogen Passivation of M–N–C (M = Fe, Co) Catalysts for Storage Stability and ORR Activity Improvements

Recent Progress in Emerging Two-Dimensional Transition Metal Carbides

Li-ion storage properties of two-dimensional titanium-carbide synthesized via fast one-pot method in air atmosphere

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