| 1. |
- Ail, Ujwala, et al.
(författare)
-
Lignin Functionalized with Catechol for Large-Scale Organic Electrodes in Bio-Based Batteries
- 2023
-
Ingår i: ADVANCED ENERGY AND SUSTAINABILITY RESEARCH. - : WILEY. - 2699-9412. ; 4:12
-
Tidskriftsartikel (refereegranskat)abstract
- Lignin, obtained as a waste product in huge quantities from the large-scale cellulose processing industries, holds a great potential to be used as sustainable electrode material for large-scale electroactive energy storage systems. The fixed number of redox-active phenolic groups present within the lignin structure limits the electrochemical performance and the total energy storage capacity of the lignin-based electrodes. Herein, the way to enhance the charge storage capacity of lignin by incorporating additional small catechol molecules into the lignin structure is demonstrated. The catechol derivatives are covalently attached to the lignin via aromatic electrophilic substitution reaction. The increased phenolic groups in all functionalized lignin derivatives notably increase the values of capacitance compared to pristine lignin. Further, solvent fractionation of lignin followed by functionalization using catechol boosts three times the charge capacity of lignin electrode. Herein, a scalable, cost-effective method to enhance the electrochemical performance of lignin electrodes via incorporation of small redox active moieties into the lignin structure is demonstrated. Solvent fractionation of lignin followed by functionalization using catechol increases the charge storage capacity of the lignin-carbon composite electrode by a factor of 3 reaching record high charge capacity above 100 mAh g-1.
|
|
| 2. |
- Hjort, Victor, et al.
(författare)
-
Phase Composition and Thermoelectric Properties of Epitaxial CrMoVN Thin Films
- 2023
-
Ingår i: ADVANCED ENERGY AND SUSTAINABILITY RESEARCH. - : WILEY. - 2699-9412. ; 4:12
-
Tidskriftsartikel (refereegranskat)abstract
- Thin films of CrMoVN are deposited on c-plane sapphire (Al2O3 (0001)) by direct current reactive magnetron sputtering, to investigate the effects of Mo and V addition to CrN-based films. All films grow epitaxially, but Mo incorporation affects the crystal structure and nitrogen content. All films in the CrMoVN series are understoichiometric in nitrogen, but largely retain the NaCl B1 structure of stoichiometric CrN films. Addition of vanadium increases the phase-stability range of the cubic phase, allowing for higher solubility of Mo than what has previously been reported for cubic CrN. The Seebeck coefficient and electrical resistivity are greatly affected by the alloying, showing a decrease of the Seebeck coefficient along with a decrease in resistivity. Cr0.83Mo0.11V0.06Nz shows a 70% increase in power factor (S2 sigma = 0.22 mW m-1 K-2) compared to the reference CrNz (S2 sigma = 0.13 mW m-1 K-2). Thermoelectric (TE) materials are in use in several applications, but often have too low efficiency. For more widespread use of these materials, fundamental research on TE material system is necessary. In this work, alloying in CrN, with the hope of pushing a material with great promise closer to applications, is investigated.image (c) 2023 WILEY-VCH GmbH
|
|
| 3. |
- Molaei, Arman, 1988-, et al.
(författare)
-
Faradic Side Reactions at Novel Carbon Flow-Through Electrodes for Desalination Studied in a Static Supercapacitor Architecture
- 2023
-
Ingår i: Advanced Energy and Sustainability Research. - : Wiley. - 2699-9412. ; 4:1
-
Tidskriftsartikel (refereegranskat)abstract
- Desalination by capacitive deionization (CDI) is a promising technique to combine desalination and energy storage. The efficiency of charge storage process, which is equivalent to the desalination process, depends strongly on the presence of Faradic side reactions on the electrode. Herein, the performance of a new low-cost designed flow-through electrode with porous carbon nanoparticles (CP) coating on carbon-fiber paper (CFP) is evaluated. The CP layer enables high capacitance while the CFP core makes fluid dynamics along and across the electrode. The electrodes are evaluated by studying the effective operational CDI parameters, such as operational voltage, degassing of electrolyte, and salt concentration. The Faradic side reaction and its effect on charge efficiency (CE) are evaluated which are estimated to decrease to 46% by liquid flow bringing dissolved oxygen from the air-electrolyte interface to the electrode. The CE enhances to 59% with a salt concentration of 1 m. By purging N-2 gas, CE is much higher (>85%) with a maximum efficiency of 97% at 0.6 V. Three regimes of the complex kinetic of side reactions are found involving various species such as O-2, H2O2, H-2, and carbon oxidation and the implication of those regimes for real applications are discussed.
|
|
| 4. |
- Siam Siraj, Mohammad, 1993, et al.
(författare)
-
Advancing Structural Battery Composites: Robust Manufacturing for Enhanced and Consistent Multifunctional Performance
- 2023
-
Ingår i: Advanced Energy and Sustainability Research. - 2699-9412. ; 4:11
-
Tidskriftsartikel (refereegranskat)abstract
- Multifunctional materials offer a possibility to create lighter and more resource-efficient products and thereby improve energy efficiency. Structural battery composites are one type of such a multifunctional material with potential to offer massless energy storage for electric vehicles and aircraft. Although such materials have been demonstrated, their performance level and consistency must be improved. Also, the cell dimensions need to be increased. Here, we develop a robust manufacturing procedure and repeatedly manufacture structural battery composite cells with double the multifunctional performance and size compared to state-of-the-art structural battery cells. Furthermore, six structural battery cells are selected and laminated into a structural battery composite multicell demonstrator to showcase the technology. The multicell demonstrator performance is characterised for two different electrical configurations. The low variability in the multifunctional properties of the cells verifies the potential for upscaling offered by the proposed manufacture technique.
|
|
| 5. |
- Tian, Gui-Xian, et al.
(författare)
-
Facile Hydrothermal Synthesis of Highly Efficient and Durable Ternary PtPdCu Electrocatalysts for the Methanol Oxidation Reaction
- 2023
-
Ingår i: Advanced Energy and Sustainability Research. - : Wiley. - 2699-9412.
-
Tidskriftsartikel (refereegranskat)abstract
- Precious metal Pt-based electrocatalysts have been widely used in the methanol catalytic oxidation anodes in direct methanol fuel cells. However, decreasing their cost and improving their efficiency and durability have still been challenging. Herein, ternary PtPdCu nanocatalysts are synthesized through a facile one-step hydrothermal synthesis method. When KI is present with a suitable amount in the synthesis, PtPdCu nanospheres with surface-embedded CuI clusters (CuI/PtPdCu) are fabricated. However, without KI, the prepared PtPdCu catalysts show a distinct hollow structure (h-PtPtCu). CuI/PtPdCu displays the highest specific activity with enhancement 4 times higher than commercial Pt/C for the methanol oxidation reaction in an alkaline medium. The superior activity can be attributed to two aspects: 1) the electronic effect originating from the highly alloyed PtPdCu; 2) the synergetic effect resulting from surface inlaid CuI clusters, which can promote the CO intermediate removal. Furthermore, because of the stable Pt-Pd-rich surface and its special linked hollow structure, the h-PtPtCu catalyst exhibits good durability with only a 3.6% decay in the specific activity.
|
|
| 6. |
- Weindl, Christian L., et al.
(författare)
-
Toluene‐Mediated Morphology Tuning of Diblock Copolymer‐Templated Porous Si/Ge/K/C Thin Films for Li‐Ion Batteries
- 2023
-
Ingår i: Advanced Energy and Sustainability Research. - : Wiley. - 2699-9412 .- 2699-9412. ; 4:10
-
Tidskriftsartikel (refereegranskat)abstract
- Amphiphilic diblock copolymer poly(styrene-b-ethylene oxide) templating in combination with sol–gel chemistry is utilized to synthesize porous mixed silicon/germanium/potassium/carbon (Si/Ge/K/C) thin films. As a Si/Ge source, the dissolvable Zintl phase K12Si12Ge5 is used. The toluene-mediated morphological changes in the porous mixed Si/Ge/K/C thin films are studied with scanning electron microscopy and grazing incidence small/wide-angle X-Ray scattering. A dichloromethane solvent vapor annealing step is applied to study the additional morphological transformation inside the films. Since Ge and Si are promising anode materials in Li-ion batteries, CR2032 half-cells are manufactured with the porous mixed Si/Ge/K/C thin films and characterized by cyclic voltammograms, cycling, and impedance spectroscopy.
|
|
| 7. |
- Yang, Zhongwei, et al.
(författare)
-
Application of Biomass-Based Nanomaterials in Energy
- 2023
-
Ingår i: Advanced Energy and Sustainability Research. - 2699-9412. ; 4:12
-
Forskningsöversikt (refereegranskat)abstract
- The utilization of biomass as a sustainable and renewable resource for nanomaterial synthesis has received considerable attention in recent years. Through the efficient utilization of biomass waste, opportunities for energy production, energy conversion, and the fabrication of nanomaterials can be maximized. The combination of biomass-based nanomaterials with additional nanomaterials makes the composite system have more remarkable performance, which further facilitates the transformation procedure of biomass-based nanomaterials for applications. This comprehensive review provides an overview of the preparation and applications of biomass-based nanomaterials. The preparation section covers a range of methods for synthesizing biomass-based nanomaterials, including biomass-based carbonaceous nanomaterials, biomass-based carbon nitride nanomaterials, nanomaterials derived from biomass templates, biomass-based nanomaterials as carriers, and the use of biomass for metal ion reduction. The applications section explores the diverse applications of biomass-based nanomaterials, such as hydrogen production, carbon dioxide reduction, batteries, and supercapacitors. The unique properties and advantages of biomass-based nanomaterials in each application are discussed. The conclusion summarizes the current progress and presents future perspectives for the development and utilization of biomass-based nanomaterials. This review emphasizes the potential of biomass as a valuable and sustainable source for nanomaterial synthesis, opening up promising opportunities in various fields.
|
|
