ORCID Profile
0000-0002-7502-1215
Current Organisations
Linköpings universitet Tekniska högskolan
,
Linköpings universitet
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Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR02354B
Abstract: We report the synthesis and characterization of a new laminated i-MAX phase, (V 2/3 Sc 1/3 ) 2 AlC, with in-plane chemical ordering between the M-elements. We also produce V 2−x C MXene with only 24 h etching time using HF and MXene scrolls using LiF + HCl.
Publisher: Wiley
Date: 31-12-2021
Publisher: Elsevier BV
Date: 06-2019
Publisher: American Association for the Advancement of Science (AAAS)
Date: 13-08-2021
Abstract: A range of two-dimensional (2D) materials, including graphene and hexagonal boron nitride, have been synthesized and studied because of the unusual properties that occur when one dimension becomes very small. MXenes are a family of materials made of layers of inorganic transition metal carbides and nitrides that are a few atoms thick and are manufactured by selective etching. Attempts to make similar boridene materials have been challenging because of the reactive nature of boride phases and because the parent materials tend to dissolve rather than selectively etch. Zhou et al . synthesized boridene in the form of single-layer 2D molybdenum boride sheets by selective etching in aqueous hydrofluoric acid to produce sheets with ordered metal vacancies, opening up an additional family of materials for study. —MSL
Publisher: Wiley
Date: 18-02-2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: IOP Publishing
Date: 03-10-2017
Publisher: Wiley
Date: 04-2018
Abstract: The exploration of 2D solids is one of our time's generators of materials discoveries. A recent addition to the 2D world is MXenes that possses a rich chemistry due to the large parent family of MAX phases. Recently, a new type of atomic laminated phases (coined i-MAX) is reported, in which two different transition metal atoms are ordered in the basal planes. Herein, these i-MAX phases are used in a new route for tailoriong the MXene structure and composition. By employing different etching protocols to the parent i-MAX phase (Mo
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0NR07045A
Abstract: Tailored synthesis method is used to produce higher yield of (Mo 2/3 Y 1/3 ) 2 AlC i -MAX, for realization of 2D Mo 1.33 CT z MXene with ordered vacancies, the latter shows electrochemical performance equivalent to that produced from the Sc containing i -MAX.
Publisher: American Chemical Society (ACS)
Date: 23-02-2022
Publisher: American Chemical Society (ACS)
Date: 27-07-2015
DOI: 10.1021/ACS.NANOLETT.5B00737
Abstract: The properties of two-dimensional (2D) materials depend strongly on the chemical and electrochemical activity of their surfaces. MXene, one of the most recent additions to 2D materials, shows great promise as an energy storage material. In the present investigation, the chemical and structural properties of in idual Ti3C2 MXene sheets with associated surface groups are investigated at the atomic level by aberration corrected STEM-EELS. The MXene sheets are shown to exhibit a nonuniform coverage of O-based surface groups which locally affect the chemistry. Additionally, native point defects which are proposed to affect the local surface chemistry, such as oxidized titanium adatoms (TiOx), are identified and found to be mobile.
Publisher: American Chemical Society (ACS)
Date: 23-09-2019
Publisher: American Chemical Society (ACS)
Date: 29-06-2021
Abstract: The conversion of layered transition metal carbides and/or nitrides (MXenes) into zero-dimensional structures with thicknesses and lateral dimensions of a few nanometers allows these recently discovered materials with exceptional electronic properties to exploit the additional benefits of quantum confinement, edge effects, and large surface area. Conventional methods for the conversion of MXene nanosheets and quantum dots, however, involve extreme conditions such as high temperatures and/or harsh chemicals that, among other disadvantages, lead to significant degradation of the material as a consequence of their oxidation. Herein, we show that the large surface acceleration-on the order of 10 million
Publisher: American Chemical Society (ACS)
Date: 02-12-2209
Publisher: American Chemical Society (ACS)
Date: 30-05-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA07270A
Abstract: Ti 3 C 2 T x (MXene) thin film shows elimination of –F and domination of –O surface terminations after NaOH treatment followed by annealing while preserving the electrical conductivity of the film.
Publisher: Wiley
Date: 05-08-2021
Abstract: Exploratory theoretical predictions in uncharted structural and compositional space are integral to materials discoveries. Inspired by M 5 SiB 2 (T2) phases, the finding of a family of laminated quaternary metal borides, M ′ 4 M ″SiB 2 , with out‐of‐plane chemical order is reported here. 11 chemically ordered phases as well as 40 solid solutions, introducing four elements previously not observed in these borides are predicted. The predictions are experimentally verified for Ti 4 MoSiB 2 , establishing Ti as part of the T2 boride compositional space. Chemical exfoliation of Ti 4 MoSiB 2 and select removal of Si and MoB 2 sub‐layers is validated by derivation of a 2D material, TiO x Cl y , of high yield and in the form of delaminated sheets. These sheets have an experimentally determined direct band gap of ≈4.1 eV, and display characteristics suitable for supercapacitor applications. The results take the concept of chemical exfoliation beyond currently available 2D materials, and expands the envelope of 3D and 2D candidates, and their applications.
Publisher: American Chemical Society (ACS)
Date: 23-05-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NA00642H
Abstract: Felxiable Mo 1.33 C i -MXene/MoS 2 /graphene (MOMG) nanocomposite electrode delivers volumetric capacitance up to 1600 F cm −3 in sulphric acid electolyte.
Publisher: Springer Science and Business Media LLC
Date: 25-04-2017
DOI: 10.1038/NCOMMS14949
Abstract: The exploration of two-dimensional solids is an active area of materials discovery. Research in this area has given us structures spanning graphene to dichalcogenides, and more recently 2D transition metal carbides (MXenes). One of the challenges now is to master ordering within the atomic sheets. Herein, we present a top-down, high-yield, facile route for the controlled introduction of ordered acancies in MXenes. By designing a parent 3D atomic laminate, (Mo 2/3 Sc 1/3 ) 2 AlC, with in-plane chemical ordering, and by selectively etching the Al and Sc atoms, we show evidence for 2D Mo 1.33 C sheets with ordered metal acancies and high electrical conductivities. At ∼1,100 F cm −3 , this 2D material exhibits a 65% higher volumetric capacitance than its counterpart, Mo 2 C, with no vacancies, and one of the highest volumetric capacitance values ever reported, to the best of our knowledge. This structural design on the atomic scale may alter and expand the concept of property-tailoring of 2D materials.
Publisher: American Chemical Society (ACS)
Date: 05-04-2023
Publisher: Springer Science and Business Media LLC
Date: 12-12-2022
DOI: 10.1007/S12274-021-3913-Y
Abstract: Electrochromic (EC) materials that change color with voltage have been widely studied for use in dynamic windows. However, colorless-to-colorful switching with high contrast ratio is generically unattainable, especially for colorless-to-black electrochromic materials with an ultrahigh contrast ratio over the entire visible region. In this work, we developed Nb 1.33 C MXene-based dynamic windows with colorless-to-black switching of up to 75% reversible change in transmittance from 300 to 1,500 nm. By exploring the electrochromic effects of different electrolytes through in situ optical changes and electrochemical quartz crystal microbalance (EQCM), it is found that electrochromic behavior is greatly influenced by the extent of reversible Li + insertion/deinsertion between the two-dimensional Nb 1.33 C MXene nanosheets. In addition, a colorless-to-black EC device based on Nb 1.33 C with an overall integrated contrast ratio over 80% was successfully constructed by a solution-processable spin coating method. This work enables a simple route to fabricate MXene-based high-performance electrochromic smart windows, which is important for further expanding the application of MXenes to optoelectronic and photonic applications.
Publisher: American Chemical Society (ACS)
Date: 26-02-2021
Publisher: IOP Publishing
Date: 20-02-2019
Publisher: Wiley
Date: 06-04-2018
Abstract: Structural design on the atomic level can provide novel chemistries of hybrid MAX phases and their MXenes. Herein, density functional theory is used to predict phase stability of quaternary i-MAX phases with in-plane chemical order and a general chemistry (W
Publisher: Wiley
Date: 04-11-2018
Abstract: Global warming caused by burning of fossil fuels is indisputably one of mankind's greatest challenges in the 21st century. To reduce the ever-increasing CO
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR01986J
Abstract: We investigated the presence of adsorbed species on Nb 2 C MXene surfaces and their influence on the structural stability over time.
Location: United States of America
No related grants have been discovered for Joseph Halim.