Molecular dynamics in the lyophases of copolymer P123 investigated with FFC NMR relaxometry. - In: Langmuir, ISSN 1520-5827, Bd. 35 (2019), 2, S. 435-445
https://doi.org/10.1021/acs.langmuir.8b03057
Collection optimization of photo-generated charge carriers for efficient organic solar cells. - In: Journal of power sources, ISSN 1873-2755, Bd. 412 (2019), S. 465-471
https://doi.org/10.1016/j.jpowsour.2018.11.063
Charge transport in GaAs nanowires: interplay between conductivity through the interior and surface conductivity. - In: Journal of physics, ISSN 1361-648X, Bd. 31 (2019), 7, 074004, insges. 7 S.
https://doi.org/10.1088/1361-648X/aaf515
Exciting vibrons in both frontier orbitals of a single hydrocarbon molecule on graphene. - In: Journal of physics, ISSN 1361-648X, Bd. 31 (2019), 6, S. 065001, insges. 9 S.
https://doi.org/10.1088/1361-648X/aaf54c
Optimizing hydrogen evolution activity of nanoporous electrodes by dual-step surface engineering. - In: Applied catalysis, ISSN 1873-3883, Bd. 244 (2019), S. 87-95
https://doi.org/10.1016/j.apcatb.2018.11.036
Enhancing potassium-ion battery performance by defect and interlayer engineering. - In: Nanoscale horizons, ISSN 2055-6764, Bd. 4 (2019), 1, S. 202-207
Defect and interlayer engineering is applied to exploit the large van der Waals gaps of transition metal dichalcogenides for potassium-ion batteries (KIBs). As a demonstrator, MoS2 nanoflowers with expanded interlayer spacing and defects in the basal planes are used as KIB anodes in the voltage range of 0.5–2.5 V, where an intercalation reaction rather than a conversion reaction takes place to store K-ions in the van der Waals gaps. The nanoflowers show enhanced K-storage performance compared to the defect-free counterpart that has a pristine interlayer spacing. Kinetic analysis verifies that the K-ion diffusion coefficient and surface charge storage are both enhanced in the applied voltage range of the intercalation reaction. The collective effects of expanded interlayer spacing and additionally exposed edges induced by the in-plane defects enable facile K-ion intercalation, rapid K-ion transport and promoted surface K-ion adsorption simultaneously.
https://doi.org/10.1039/C8NH00305J
A metal-organic framework-derived bifunctional catalyst for hybrid sodium-air batteries. - In: Applied catalysis, ISSN 1873-3883, Bd. 241 (2019), S. 407-414
https://doi.org/10.1016/j.apcatb.2018.09.063
Insights into the crystallinity of layer-structured transition metal dichalcogenides on potassium ion battery performance: a case study of molybdenum disulfide. - In: Small, ISSN 1613-6829, Bd. 15 (2019), 15, 1900497, insges. 9 S.
Layer-structured transition metal dichalcogenides (LS-TMDs) are being heavily studied in K-ion batteries (KIBs) owing to their structural uniqueness and interesting electrochemical mechanisms. Synthetic methods are designed primarily focusing on high capacities. The achieved performance is often the collective results of several contributing factors. It is important to decouple the factors and understand their functions individually. This work presents a study focusing on an individual factor, crystallinity, by taking MoS2 as a demonstrator. The performance of low and high-crystallized MoS2 is compared to show the function of crystallinity is dependent on the electrochemical mechanism. Lower crystallinity can alleviate diffusional limitation in 0.5-3.0 V, where intercalation reaction takes charge in storing K-ions. Higher crystallinity can ensure the structural stability of the MoS2 layers and promote surface charge storage in 0.01-3.0 V, where conversion reaction mainly contributes. The low-crystallized MoS2 exhibits an intercalation capacity (118 mAh g^-1), good cyclability (85% over 100 cycles), and great rate capability (41 mAh g^-1 at 2 A g^-1), and the high-crystallized MoS2 delivers a high capacity of 330 mAh g^-1 at 1 A g^-1 and retains 161 mAh g^-1 at 20 A g^-1, being one of the best among the reported LS-TMDs in KIBs.
https://doi.org/10.1002/smll.201900497
Albedo-Bestimmung von photovoltaisch relevanten Materialien. - In: RET.Con 2018, (2018), S. 63-68
In der vorliegenden Arbeit wurde der räumlich integrierte Reflexionsgrad von Materialien untersucht, die als Hintergrund für bifaciale Solarzellen eingesetzt werden könnten. Dabei wurden eine weiße Dachbahn, eine Dachpappe, eine weiße Reflexionsfolie und eine silberne Reflexionsfolie für die Eignung als Rückreflektoren untersucht, sowie in wie weit sich ein schwarzer Bühnenmolton als Lichtfalle für Charakterisierungsaufbauten eignet. Dabei wurde zwischen dem spektral gemittelten Reflexionsgrad und einem durch das Sonnenspektrum gewichteten gemittelten Reflexionsgrad unterschieden. Diese Unterscheidung zeigt, dass bei Materialien mit starken spektralen Änderungen des Reflexionsgrades, eine Über- oder Unterschätzung des Materials bezüglich seiner Tauglichkeit als Reflektor, im photovoltaischen Bereich, durch eine Reine Mittelung des Reflektionsgrades, auftreten kann. Für alle untersuchten Materialien würde, im für Silizium Solarzellen relevanten Bereich, die direkte und die diffuse Reflexion bestimmt.
https://doi.org/10.22032/dbt.45822
Scanning tunneling spectroscopies of magnetic atoms, clusters, and molecules. - In: Atomic- and nanoscale magnetism, (2018), S. 25-53