Browsing UiS Brage by Author "Tucho, Wakshum Mekonnen"
Now showing items 1-17 of 17
-
Bed packing configuration and hot-spot utilization for low-temperature CO2 methanation on monolithic reactor
Huynh, Huong Lan; Tucho, Wakshum Mekonnen; Shen, Qi; Yu, Zhixin (Peer reviewed; Journal article, 2022)The revival of CO2 methanation (Sabatier reaction) as part of the large-scale Power-to-Gas technology has stimulated the development of novel reactor concepts for better heat management due to its exothermic nature. The ... -
Breaking Scaling Relations for Highly Efficient Electroreduction of CO2 to CO on Atomically Dispersed Heteronuclear Dual-Atom Catalyst
Lu, Song; Mazur, Michal; Guo, Kun; Stoian, Dragos Constantin; Gu, Minfen; Tucho, Wakshum Mekonnen; Yu, Zhixin (Peer reviewed; Journal article, 2023)Conversion of CO2 into value-added products by electrocatalysis provides a promising way to mitigate energy and environmental problems. However, it is greatly limited by the scaling relationship between the adsorption ... -
Directed laser deposition of super duplex stainless steel: Microstructure, texture evolution, and mechanical properties
Sayyar, Navid; Hansen, Vidar Folke; Tucho, Wakshum Mekonnen; Minde, Mona Wetrhus (Peer reviewed; Journal article, 2023-04)Microstructure and texture evolution of directed-laser deposited super-duplex stainless-steel, in the as-received block, were characterized using light and electron microscopies and electron backscattered diffraction. ... -
Effect of hydrogen on mechanical properties and fracture of martensitic carbon steel under quenched and tempered conditions
Adasooriya, Mudiyan Nirosha Damayanthi; Tucho, Wakshum Mekonnen; Holm, Erlend; Årthun, Terje; Hansen, Vidar; Solheim, Karl Gunnar; Hemmingsen, Tor (Peer reviewed; Journal article, 2020)The change in the mechanical properties of tempered high strength carbon steel (AISI 4130) due to hydrogen embrittlement (HE) has been investigated using slow strain rate tensile tests (SSRT). The heat treatment processes ... -
Efficient Electrochemical Reduction of CO2 to CO by Ag-Decorated B-Doped g-C3N4: A Combined Theoretical and Experimental Study
Lu, Song; Zhang, Yang; Mady, Mohamed Fawzy Hamed Attia; Tucho, Wakshum Mekonnen; Lou, Fengliu; Yu, Zhixin (Peer reviewed; Journal article, 2022)Electrochemical CO2 reduction (ECR) has received great attention in energy conversion and CO2 mitigation. In recent years, graphitic carbon nitride (g-C3N4) has been regarded as a very promising support for metal nanoparticles ... -
Enabling Increased Delithiation Rates in Silicon-Based Anodes through Alloying with Phosphorus
Huld, Frederik Thorbjørn; Lai, Samson Yuxiu; Tucho, Wakshum Mekonnen; Batmaz, Rasim; Jensen, Ingvild Julie Thue; Lu, Song; Eleri, Obinna Egwu; Koposov, Alexey; Yu, Zhixin; Lou, Fengliu (Peer reviewed; Journal article, 2022)The capability of battery materials to deliver not only high lithium storage capacity, but also the ability to operate at high charge/discharge rates is an essential property for development of new batteries. In the present ... -
The influences of international standards on structural performance and fracture behavior of 3D printed long fiber composite structures
Akessa, Adugna Deressa; Adugna, Yosef Wakjira; Tucho, Wakshum Mekonnen (Peer reviewed; Journal article, 2023)The material properties of the additive manufactured composite structures are usually done following international standards, that show some difference dimensionally. This study focuses on the impact-induced on the tensile ... -
Investigations of Microstructure and Mechanical Properties of 17-4 Ph Ss Printed by Markforged Metal X
Akessa, Adugna Deressa; Tucho, Wakshum Mekonnen; Lemu, Hirpa Gelgele; Grønsund, Jørgen (Peer reviewed; Journal article, 2022-10)The Markforged Metal X (MfMX) printing machine (Markforged Inc., Massachusetts, USA) is one of the latest introduced additive manufacturing (AM) devices. It is getting popular because of its safety, simplicity, and ability ... -
Mekaniske egenskaper og mikrostruktur til LMD 3D-printet Duplex rustfritt stål
Egeland, Erlend; Ree, Magnus (Bachelor thesis, 2021)Denne oppgaven har som hovedmål å teste et 3D-printet material i duplex rustfritt stål. De mekaniske egenskapene til 3D-printet duplex stål kan variere etter hvilken 3D-printe metode som blir brukt. Stålet i denne oppgaven ... -
Mekaniske egenskaper og mikrostruktur til LMD 3D-printet Duplex rustfritt stål
Egeland, Erlend; Ree, Magnus (Bachelor thesis, 2021)Denne oppgaven har som hovedmål å teste et 3D-printet material i duplex rustfritt stål. De mekaniske egenskapene til 3D-printet duplex stål kan variere etter hvilken 3D-printe metode som blir brukt. Stålet i denne oppgaven ... -
Promoting effect of Fe on supported Ni catalysts in CO2 methanation by in situ DRIFTS and DFT study
Huynh, Huong Lan; Zhu, Jie; Zhang, Guanghui; Shen, Yongli; Tucho, Wakshum Mekonnen; Ding, Yi; Yu, Zhixin (Peer reviewed; Journal article, 2020-12)Bimetallic NiFe catalysts have emerged as a promising alternative to the traditional Ni catalysts for CO2 methanation. However, the promoting effect of Fe on the bimetallic catalysts remains ambiguous. In this study, a ... -
Revealing mechanisms of activated carbon capacity fade in lithium-ion capacitors
Eleri, Obinna Egwu; Huld, Frederik Thorbjørn; Pires, Julie; Tucho, Wakshum Mekonnen; Schweigart, Philipp; Svensson, Ann Mari; Lou, Fengliu; Yu, Zhixin (Peer reviewed; Journal article, 2023-04)The capacity fade mechanism of activated carbon (AC) electrode in Li-ion electrolyte was studied via electrochemical impedance spectroscopy (EIS) and post-mortem electrode characterizations at different stages of electrochemical ... -
Structured NiFe catalysts derived from in-situ grown layered double hydroxides on ceramic monolith for CO2 methanation
Huynh, Huong Lan; Tucho, Wakshum Mekonnen; Yu, Zhixin (Peer reviewed; Journal article, 2020)Monolithic catalysts for CO2 methanation have become an active research area for the industrial development of Power-to-Gas technology. In this study, we developed a facile and reproducible synthesis strategy for the ... -
Studies of Post-Fabrication Heat Treatment of L-PBF-Inconel 718: Effects of Hold Time on Microstructure, Annealing Twins, and Hardness
Tucho, Wakshum Mekonnen; Hansen, Vidar Folke (Peer reviewed; Journal article, 2021-02)The widely adopted temperature for solid solution heat treatment (ST) for the conventionally fabricated Inconel 718 is 1100 °C for a hold time of 1 h or less. This ST scheme is, however, not enough to dissolve Laves and ... -
Sulfur‐Decorated Ni−N−C Catalyst for Electrocatalytic CO2 Reduction with Near 100 % CO Selectivity
Lu, Song; Zhang, Yang; Mady, Mohamed F; Eleri, Obinna Egwu; Tucho, Wakshum Mekonnen; Mazur, Michal; Li, Ang; Lou, Fengliu; Gu, Mingfen; Yu, Zhixin (Peer reviewed; Journal article, 2022-08)Developing highly efficient electrocatalysts for electrochemical CO2 reduction (ECR) to value-added products is important for CO2 conversion and utilization technologies. In this work, a sulfur-doped Ni−N−C catalyst is ... -
Synthetic natural gas production from CO2 and renewable H2: Towards large-scale production of Ni–Fe alloy catalysts for commercialization
Huynh, Huong Lan; Tucho, Wakshum Mekonnen; Yu, Xinhai; Yu, Zhixin (Peer reviewed; Journal article, 2020-08)Synthetic natural gas (SNG) is one of the promising energy carriers for the excessive electricity generated from variable renewable energy sources. SNG production from renewable H2 and CO2 via catalytic CO2 methanation has ... -
Tuning the interfacial sites between copper and metal oxides (Zn, Zr, In) for CO2 hydrogenation to methanol
Stangeland, Kristian; Navarro, Hans Herrera; Huynh, Huong Lan; Tucho, Wakshum Mekonnen; Yu, Zhixin (Peer reviewed; Journal article, 2021)The influence of different metal oxides (ZnO, ZrO2, In2O3) in CO2 hydrogenation to methanol over Cu-based catalysts was studied. The catalysts were characterized using x-ray diffraction (XRD), thermal gravimetric analysis ...