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  1. Article ; Online: 3D printing of MAX/PLA filament

    Shaista Nouseen / Kalyan Ghosh / Martin Pumera

    Electrochemistry Communications, Vol 160, Iss , Pp 107652- (2024)

    Electrochemical in-situ etching for enhanced energy conversion and storage

    2024  

    Abstract: Two-dimensional (2D) MXenes are promising materials for a variety of sustainable energy-related applications such as photoelectrochemical water splitting and energy storage devices. Among the MXene family, the Ti3C2Tx is mostly prepared by selective ... ...

    Abstract Two-dimensional (2D) MXenes are promising materials for a variety of sustainable energy-related applications such as photoelectrochemical water splitting and energy storage devices. Among the MXene family, the Ti3C2Tx is mostly prepared by selective etching of Al from the Ti3AlC2 MAX phase using hydrofluoric acid (HF) or in-situ produced HF as an etchant. However, the severe toxicity, handling of HF acid as well as the oxidation and degradation of freshly synthesized MXenes when stored as aqueous suspensions obstruct the large-scale production of MXenes. 3D printing is an innovative and versatile technology utilized for a plethora of applications in the field of energy applications. Thus, integration of 3D printing technology with the synthesis procedure of MXene will provide a new outlook for large-scale production and the long-storing capability of MXene. Herein, we fabricated a novel MAX (Ti3AlC2)/polylactic acid (PLA) filament for fused deposition modeling (FDM) 3D printing followed by etching of the 3D-printed MAX/PLA electrode into 3DP-etched-MAX employing chronoamperometry technique consecutively in 9 M HCl and 4 M NaOH as electrolytes. The 3D printed electrochemically etched MAX (3DP-etched-MAX) electrode shows promising behaviour for the photoelectrochemical hydrogen evolution reaction (HER) and capacitive performance. In general, this work demonstrates a path of production of large-scale manufacturing of MAX/PLA filament and 3DP-etched-MAX electrodes without using toxic HF for energy conversion and energy storage applications. This work paves the way to fabricate other novel MAX filaments and electrodes for several applications beyond energy conversion and storage.
    Keywords Electrochemical etching ; MXenes ; MAX ; 3D printing ; Electrode ; Hydrogen evolution reaction ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
    Subject code 660
    Language English
    Publishing date 2024-03-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: MXene-functionalised 3D-printed electrodes for electrochemical capacitors

    Edurne Redondo / Martin Pumera

    Electrochemistry Communications, Vol 124, Iss , Pp 106920- (2021)

    2021  

    Abstract: 3D printing is a manufacturing technique that can be used to produce electrochemical capacitors with customised shapes and minimal material waste. However, the range of carbon-additive filaments currently commercially available is limited, resulting in ... ...

    Abstract 3D printing is a manufacturing technique that can be used to produce electrochemical capacitors with customised shapes and minimal material waste. However, the range of carbon-additive filaments currently commercially available is limited, resulting in 3D-printed electrodes with a poor capacitive performance due to their high thermoplastic content. Herein, a novel approach is presented for enhancing the electrochemical properties of 3D-printed electrodes, based on electrochemical activation of the electrodes followed by MXene functionalisation. Archetypal MXene, Ti3C2, has been used to modify the 3D-printed electrode surface; it has been demonstrated that it enhances the capacitance of the electrodes almost three-fold. These findings show a new route towards enhancing the performance of 3D-printed electrochemical capacitors and pave the way for further developments leading to other electrochemical applications.
    Keywords MXene ; Ti3C2 ; 3D printing ; Functionalisation ; Electrochemical capacitor ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
    Language English
    Publishing date 2021-03-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Trapping and detecting nanoplastics by MXene-derived oxide microrobots

    Mario Urso / Martina Ussia / Filip Novotný / Martin Pumera

    Nature Communications, Vol 13, Iss 1, Pp 1-

    2022  Volume 14

    Abstract: Nanoplastic water pollution represents an increasing concern. Here, photogravitactic MXene-derived microrobots are programmed to trap nanoplastics in the layered structure and magnetically transfer them to low-cost electrodes for further detection. ...

    Abstract Nanoplastic water pollution represents an increasing concern. Here, photogravitactic MXene-derived microrobots are programmed to trap nanoplastics in the layered structure and magnetically transfer them to low-cost electrodes for further detection.
    Keywords Science ; Q
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Nanomotor tracking experiments at the edge of reproducibility

    Filip Novotný / Martin Pumera

    Scientific Reports, Vol 9, Iss 1, Pp 1-

    2019  Volume 11

    Abstract: Abstract The emerging field of self-propelling micro/nanorobots is teeming with a wide variety of novel micro/nanostructures, which are tested here for self-propulsion in a liquid environment. As the size of these microscopic movers diminishes into the ... ...

    Abstract Abstract The emerging field of self-propelling micro/nanorobots is teeming with a wide variety of novel micro/nanostructures, which are tested here for self-propulsion in a liquid environment. As the size of these microscopic movers diminishes into the fully nanosized region, the ballistic paths of an active micromotor become a random walk of colloidal particles. To test such colloidal samples for self-propulsion, the commonly adopted “golden rule” is to refer to the mean squared displacement (MSD) function of the measured particle tracks. The practical significance of the result strongly depends on the amount of collected particle data and the sampling rate of the particle track. Because micro/nanomotor preparation methods are mostly low-yield, the amount of used experimental data in published results is often on the edge of reproducibility. To address the situation, we perform MSD analysis on an experimental as well as simulated dataset. These data are used to explore the effects of MSD analysis on limited data and several situations where the lack of data can lead to insignificant results.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2019-09-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: 3D-printed nanocarbon sensors for the detection of chlorophenols and nitrophenols

    Jyoti / Edurne Redondo / Osamah Alduhaish / Martin Pumera

    Electrochemistry Communications, Vol 125, Iss , Pp 106984- (2021)

    Towards environmental applications of additive manufacturing

    2021  

    Abstract: 3D printing is a manufacturing technique used to prototype devices with customized shapes composed of different materials, including carbon composites. Toxic phenolic compounds are a major environmental hazard. Herein, we demonstrate the use of carbon- ... ...

    Abstract 3D printing is a manufacturing technique used to prototype devices with customized shapes composed of different materials, including carbon composites. Toxic phenolic compounds are a major environmental hazard. Herein, we demonstrate the use of carbon-based 3D-printed electrodes for the detection of chlorophenols and nitrophenols. The influence of pH on the voltammetric response was studied, and an alkaline pH was identified as the best environment for the detection of substituted phenols. Simultaneous detection of phenolic compounds was performed using differential pulse voltammetry. This approach appears promising for the fabrication of electrochemical sensors.
    Keywords 3D-printed nanocarbon electrode ; Phenols ; Electrochemical analysis ; Additive manufacturing ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Electrocatalytic activity of layered MAX phases for the hydrogen evolution reaction

    K.P. Akshay Kumar / Osamah Alduhaish / Martin Pumera

    Electrochemistry Communications, Vol 125, Iss , Pp 106977- (2021)

    2021  

    Abstract: The hydrogen evolution reaction (HER) is important for the advancement of next-generation electrochemical energy devices. The search for an alternative inexpensive catalyst for energy conversion to replace expensive and rare noble metals is of high ... ...

    Abstract The hydrogen evolution reaction (HER) is important for the advancement of next-generation electrochemical energy devices. The search for an alternative inexpensive catalyst for energy conversion to replace expensive and rare noble metals is of high priority. There has been a significant push to investigate electrocatalysis of various layered materials for hydrogen evolution. However, the electrocatalytic activity of layered MAX phases remains largely unexplored. Herein, electrocatalytic activity studies of MAX (Ti2AlC, Ta2AlC, Ti2SnC, Ti3SiC2, V2AlC, Mo2TiAlC2, and Cr2AlC) phases are conducted. Material and electrochemical characterization are carried out to understand the morphology and catalytic activity, respectively. From Tafel slope analysis, it was found that proton adsorption is the rate-limiting step for all the MAX phases studied. Double transition-metal MAX carbides (Mo2TiAlC2) showed better catalytic activity for HER than single transition-metal MAX carbides.
    Keywords MAX phases ; Layered materials ; Double transition MAX carbides ; Electrochemistry ; Hydrogen evolution reaction ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
    Subject code 540
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Layered transition metal selenophosphites for visible light photoelectrochemical production of hydrogen

    Michela Sanna / Siowwoon Ng / Martin Pumera

    Electrochemistry Communications, Vol 129, Iss , Pp 107077- (2021)

    2021  

    Abstract: The growing consumption of global energy has posed serious challenges to environmental protection and energy supplies. A promising solution is via introducing clean and sustainable energy sources, including photoelectrochemical hydrogen fuel production. ... ...

    Abstract The growing consumption of global energy has posed serious challenges to environmental protection and energy supplies. A promising solution is via introducing clean and sustainable energy sources, including photoelectrochemical hydrogen fuel production. 2D materials, such as transition metal trichalcogenphosphites (MPCh3), are gaining more and more interest for their potential as photocatalysts. Crystals of transition metal selenophosphites, namely MnPSe3, FePSe3 and ZnPSe3, were tested as photocatalysts for the hydrogen evolution reaction (HER). ZnPSe3 is the one that exhibited the lowest overpotential and the higher response to the light during photocurrent experiments in acidic media. For this reason, among the crystals in this work, it is the most promising for the photocatalyzed production of hydrogen.
    Keywords 2D materials ; Transition metal selenophosphites ; Photoelectrocatalyst ; Hydrogen evolution reaction ; Photoelectrochemistry ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
    Subject code 660
    Language English
    Publishing date 2021-08-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Heterolayered carbon allotrope architectonics via multi-material 3D printing for advanced electrochemical devices

    Mario Palacios-Corella / Michela Sanna / José Muñoz / Kalyan Ghosh / Stefan Wert / Martin Pumera

    Virtual and Physical Prototyping, Vol 18, Iss

    2023  Volume 1

    Abstract: ABSTRACT3D printing has become a powerful technique in electrochemistry for fabricating electrodes, thanks to readily available conductive nanocomposite filaments, such as those based on carbon fillers (i.e., carbon nanotubes (CNTs) or carbon black (CB)) ...

    Abstract ABSTRACT3D printing has become a powerful technique in electrochemistry for fabricating electrodes, thanks to readily available conductive nanocomposite filaments, such as those based on carbon fillers (i.e., carbon nanotubes (CNTs) or carbon black (CB)) within an insulating polymeric matrix like polylactic acid (PLA). Inspired by inorganic heterostructures that enhance the functional characteristics of nanomaterials, we fabricated hetero-layered 3D printed devices based on carbon allotropes using a layer-by-layer assembly approach. The heterolayers were customised through the alternate integration of different carbon allotrope filaments via a multi-material 3D printing technique, allowing for a time-effective method to enhance electrochemical performance. As a first demonstration of applicability, CNT/PLA and CB/PLA filaments were utilised to construct ordered hetero-layered carbon-based electrodes. This contrasts with conventional methods where various carbon species are mixed in the same composite-based filament used for building electrochemical devices. Multi-material 3D-printed carbon electrodes exhibit improved electrochemical performance in energy conversion (e.g., hydrogen evolution reaction or HER) and sensing applications (e.g., ascorbic acid detection) compared to single-material electrodes. This work paves the way for manufacturing advanced 3D-printed heterolayered electrodes with enhanced electrochemical activity through multi-material 3D printing technology.
    Keywords Additive manufacturing ; fused deposition modelling ; electrocatalysis ; electrochemistry ; carbon allotropes ; Science ; Q ; Manufactures ; TS1-2301
    Subject code 600
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher Taylor & Francis Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Reconfigurable self-assembly of photocatalytic magnetic microrobots for water purification

    Mario Urso / Martina Ussia / Xia Peng / Cagatay M. Oral / Martin Pumera

    Nature Communications, Vol 14, Iss 1, Pp 1-

    2023  Volume 13

    Abstract: Abstract The development of artificial small-scale robotic swarms with nature-mimicking collective behaviors represents the frontier of research in robotics. While microrobot swarming under magnetic manipulation has been extensively explored, light- ... ...

    Abstract Abstract The development of artificial small-scale robotic swarms with nature-mimicking collective behaviors represents the frontier of research in robotics. While microrobot swarming under magnetic manipulation has been extensively explored, light-induced self-organization of micro- and nanorobots is still challenging. This study demonstrates the interaction-controlled, reconfigurable, reversible, and active self-assembly of TiO2/α-Fe2O3 microrobots, consisting of peanut-shaped α-Fe2O3 (hematite) microparticles synthesized by a hydrothermal method and covered with a thin layer of TiO2 by atomic layer deposition (ALD). Due to their photocatalytic and ferromagnetic properties, microrobots autonomously move in water under light irradiation, while a magnetic field precisely controls their direction. In the presence of H2O2 fuel, concentration gradients around the illuminated microrobots result in mutual attraction by phoretic interactions, inducing their spontaneous organization into self-propelled clusters. In the dark, clusters reversibly reconfigure into microchains where microrobots are aligned due to magnetic dipole-dipole interactions. Microrobots’ active motion and photocatalytic properties were investigated for water remediation from pesticides, obtaining the rapid degradation of the extensively used, persistent, and hazardous herbicide 2,4-Dichlorophenoxyacetic acid (2,4D). This study potentially impacts the realization of future intelligent adaptive metamachines and the application of light-powered self-propelled micro- and nanomotors toward the degradation of persistent organic pollutants (POPs) or micro- and nanoplastics.
    Keywords Science ; Q
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Genosensing on a 3D-printed nanocarbon electrode

    Jyoti / Miroslav Fojta / Monika Hermanová / Hana Pivoňková / Osamah Alduhaish / Martin Pumera

    Electrochemistry Communications, Vol 151, Iss , Pp 107508- (2023)

    2023  

    Abstract: In this paper we present the characterization of 3D-printed nanocarbon electrodes (3DnCes) and their application in electrochemical enzyme-linked detection of DNA hybridization. The approach takes advantage of a facile procedure based on adsorption of ... ...

    Abstract In this paper we present the characterization of 3D-printed nanocarbon electrodes (3DnCes) and their application in electrochemical enzyme-linked detection of DNA hybridization. The approach takes advantage of a facile procedure based on adsorption of target DNA on the electrode surface followed by hybridization with a biotinylated probe and binding of streptavidin–alkaline phosphatase conjugate. The alkaline phosphatase converts 1-naphthyl phosphate in the background electrolyte into electrochemically oxidizable 1-naphthol, which is subsequently detected using linear sweep voltammetry. The preparation, characterization, and analytical performance of the 3DnCes are reported. The results show the applicability of such 3DnCes in detection of target DNA hybridization specifically with the complementary biotinylated probe, and indicate the potential of 3D printed electrodes for use in various bioanalytical approaches.
    Keywords 3D-printed nanocarbon electrode ; DNA hybridization ; Electrochemical analysis ; Additive manufacturing ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
    Subject code 500
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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