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Fan, L., Song, Y., Zhang, F., Timmer, B., Kravberg, A., Zhang, B. & Sun, L. (2023). Holistic functional biomimetics: a key to make an efficient electrocatalyst for water oxidation. Journal of Materials Chemistry A, 11(20), 10669-10676
Open this publication in new window or tab >>Holistic functional biomimetics: a key to make an efficient electrocatalyst for water oxidation
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2023 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 11, no 20, p. 10669-10676Article in journal (Refereed) Published
Abstract [en]

Water oxidation is the holy grail reaction of natural and artificial photosynthesis. How to design an efficient water-oxidation catalyst remains a long-term challenge for solar fuel production. The rate of water oxidation in photosystem II by the oxygen-evolving complex (OEC) Mn4CaO5 cluster is as high as 100-400 s−1. Mimicking the structures of the OEC is a straightforward strategy to design water-oxidation catalysts. However, the high efficiency of the OEC relies on not only its highly active site but also its holistic system for well-organized electron transfer and proton transport. Lacking such a holistic functional system makes δ-MnO2 a poor water-oxidation catalyst, although the local structure of δ-MnO2 is similar to that of the Mn4CaO5 cluster. Electrocatalysts simultaneously imitating the catalytically active sites, fast electron transfer, and promoted proton transport in a natural OEC have been rarely reported. The significance of the synergy of a holistic system is underrated in the design of water-oxidation catalysts. In this work, we fabricated holistic functional biomimetic composites of two-dimensional manganese oxide nanosheets and pyridyl-modified graphene (MnOx-NS/py-G) for electrocatalytic water oxidation. MnOx-NS/py-G simultaneously imitates the synergy of catalytically active sites, fast electron transfer, and promoted proton transport in a natural OEC, resulting in overall 600 times higher activity than that of typical δ-MnO2. This work demonstrates the significance of holistic functional biomimetic design and guides the development of highly active electrocatalysts for small molecule activation related to solar energy storage.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC), 2023
National Category
Physical Chemistry Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-331571 (URN)10.1039/d3ta01040f (DOI)000983915400001 ()2-s2.0-85159156124 (Scopus ID)
Note

QC 20230711

Available from: 2023-07-11 Created: 2023-07-11 Last updated: 2023-09-06Bibliographically approved
Ornek, C., Mueller, T., Sesen, B. M., Kivisakk, U., Zhang, F., Långberg, M., . . . Pan, J. (2022). Hydrogen-Induced Micro-Strain Evolution in Super Duplex Stainless Steel-Correlative High-Energy X-Ray Diffraction, Electron Backscattered Diffraction, and Digital Image Correlation. FRONTIERS IN MATERIALS, 8, Article ID 793120.
Open this publication in new window or tab >>Hydrogen-Induced Micro-Strain Evolution in Super Duplex Stainless Steel-Correlative High-Energy X-Ray Diffraction, Electron Backscattered Diffraction, and Digital Image Correlation
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2022 (English)In: FRONTIERS IN MATERIALS, ISSN 2296-8016, Vol. 8, article id 793120Article in journal (Refereed) Published
Abstract [en]

The local lattice strain evolution during electrochemical hydrogen charging and mechanical loading in 25Cr-7Ni super duplex stainless steel were measured in-situ using synchrotron high-energy x-ray diffraction. Post-mortem electron backscattered diffraction analysis showed that the austenite phase underwent plastic deformation in the near-surface due to hydrogen-enhanced localized plasticity, where the ferrite phase experienced hardening. In bulk regions, the ferrite was the softer phase, and the austenite remained stiff. Digital image correlation of micrographs recorded, in-situ, during mechanical tensile testing revealed intensified plastic strain localization in the austenite phase, which eventually led to crack initiation. The absorption of hydrogen caused strain localization to occur primarily in austenite grains.

Place, publisher, year, edition, pages
Frontiers Media SA, 2022
Keywords
super duplex stainless steel, hydrogen embrittlement, high-energy x-ray diffraction, lattice strain, digital image correlation, synchrotron radiation, strain localization, correlative microstructure characterization
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-309799 (URN)10.3389/fmats.2021.793120 (DOI)000757999700001 ()2-s2.0-85123192999 (Scopus ID)
Note

QC 20220315

Available from: 2022-03-15 Created: 2022-03-15 Last updated: 2022-06-25Bibliographically approved
Cao, Y., Zheng, D., Zhang, F., Pan, J. & Lin, C. (2022). Layered double hydroxide (LDH) for multi-functionalized corrosion protection of metals: A review. Journal of Materials Science & Technology, 102, 232-263
Open this publication in new window or tab >>Layered double hydroxide (LDH) for multi-functionalized corrosion protection of metals: A review
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2022 (English)In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 102, p. 232-263Article, review/survey (Refereed) Published
Abstract [en]

Layered double hydroxide (LDH) has been widely developed in the field of corrosion and protection in recent years based on its unique characteristics including anion capacity, anion exchange ability, structure memory effect, and barrier resistance. This paper comprehensively reviews recent work on the preparations, properties of LDH in the forms of powder and film and their applications in different environments in corrosion and protection. Some novel perspectives are also proposed at the end of the review for future research in corrosion and protection field.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Layered double hydroxide, Powder, Films, Corrosion protection
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-311312 (URN)10.1016/j.jmst.2021.05.078 (DOI)000778426500007 ()2-s2.0-85114822881 (Scopus ID)
Note

QC 20220421

Available from: 2022-04-21 Created: 2022-04-21 Last updated: 2022-06-25Bibliographically approved
Zhang, F., Ornek, C., Liu, M., Mueller, T., Lienert, U., Ratia-Hanby, V., . . . Pan, J. (2021). Corrosion-induced microstructure degradation of copper in sulfide-containing simulated anoxic groundwater studied by synchrotron high-energy X-ray diffraction and ab-initio density functional theory calculation. Corrosion Science, 184, Article ID 109390.
Open this publication in new window or tab >>Corrosion-induced microstructure degradation of copper in sulfide-containing simulated anoxic groundwater studied by synchrotron high-energy X-ray diffraction and ab-initio density functional theory calculation
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2021 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 184, article id 109390Article in journal (Refereed) Published
Abstract [en]

Synchrotron high-energy XRD measurements and ab-initio DFT calculations were employed to investigate microstructural degradation of copper upon exposure to sulfide-containing anoxic groundwater simulating nuclear waste repository. After two-month exposure, the high-energy XRD measurements revealed heterogeneous lattice deformation in the microstructure and lattice expansion in near-surface regions. The DFT calculations show that sulfur promotes hydrogen adsorption on copper. Water causes surface reconstruction and promotes hydrogen insertion into the microstructure, occurring via interstitial sites next to vacancies leading to lattice dilation and metal bond weakening. Hydrogen infusion in the presence of sulfur caused lattice degradation, indicating a risk for H-induced cracking.

Place, publisher, year, edition, pages
Elsevier BV, 2021
Keywords
Copper canister, Hydrogen infusion, Lattice degradation, Nuclear waste, HEXRD, DFT
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-295727 (URN)10.1016/j.corsci.2021.109390 (DOI)000639161500002 ()2-s2.0-85102420395 (Scopus ID)
Note

QC 20210531

Available from: 2021-05-31 Created: 2021-05-31 Last updated: 2022-12-14Bibliographically approved
Xi, Y., Zhang, F. & Shi, Y. (2021). Effects of surface micro-structures on capacitances of the dielectric layer in triboelectric nanogenerator: A numerical simulation study. Nano Energy, 79, Article ID 105432.
Open this publication in new window or tab >>Effects of surface micro-structures on capacitances of the dielectric layer in triboelectric nanogenerator: A numerical simulation study
2021 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 79, article id 105432Article in journal (Refereed) Published
Abstract [en]

Triboelectric nanogenerator (TENG) provides a promising approach for energy harvesting and sensing. Micro-structures are often employed at dielectric layer for improving efficiency, but the effects on the electric output performance of TENG are not well understood. In this work, we conduct a numerical simulation study based on the planar capacitor analytical method to study the electric output performance for contact-separation (CS) TENG. Different from previous work, which only investigates the effects on the real contact area, this work also studies the effects of the surface micro-structures on the capacitance and the consequent effects on the electronic output performance. The separation to contact open circuit (OC) output voltage is focused on, which is widely employed for sensor applications. The effects of the capacitance variations on OC output voltages under different elastic modulus and micro-structure geometrical parameters are investigated. The results indicate that the capacitance variations can even lead up to more than 100% deviation of the OC output voltages, which confirms that the effect of the capacitance variations is also an important factor. More importantly, it is found that some existing experimental data cannot be explained/simulated by models without consideration of the capacitance variations, and it is more correct to use the ratio of real contact area to capacitance variations to predict the open circuit output voltage of TENG instead of only using contact area when the micro-structure size is larger than 10 µm.

Place, publisher, year, edition, pages
Elsevier BV, 2021
Keywords
Capacitance, Numerical simulation, Separation-to-contact, Surface micro-structures, TENG, Triboelectric Nanogenerator, Energy harvesting, Geometry, Microstructure, Nanogenerators, Nanotechnology, Numerical methods, Numerical models, Triboelectricity, Capacitance variation, Contact separation, Improving efficiency, Numerical simulation studies, Open-circuit output voltages, Output performance, Sensor applications, Surface microstructures
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-285284 (URN)10.1016/j.nanoen.2020.105432 (DOI)000620325000002 ()2-s2.0-85092446550 (Scopus ID)
Note

QC 20201203

Available from: 2020-12-03 Created: 2020-12-03 Last updated: 2025-02-14Bibliographically approved
Cheng, J., Mei, N., Chen, S., Bai, P., Shen, B., Pan, J. & Zhang, F. (2021). Interactions in Composite Film Formation of Mefp-1/graphene on Carbon Steel. Coatings, 11(10), Article ID 1161.
Open this publication in new window or tab >>Interactions in Composite Film Formation of Mefp-1/graphene on Carbon Steel
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2021 (English)In: Coatings, ISSN 2079-6412, Vol. 11, no 10, article id 1161Article in journal (Refereed) Published
Abstract [en]

Mefp-1 adhesive protein derived from marine blue mussels, together with the 2D material graphene, was used to build the green composite film with enhanced anti-corrosion property and mechanical strength. The corrosion inhibition of the composite film, formed by different methods, was evaluated by using electrochemical impedance spectroscopy. The non-degraded adhesion of the composite film to the carbon steel substrate was proved by nano-scratch tests. Infrared spectroscopy was utilized to investigate the film formation process and "three-body interactions " between Mefp-1, graphene and carbon steel surface. The results show that the Mefp-1 adsorbs on the carbon steel surface mainly through the covalent bond between catechols and Fe(III). Meanwhile, Mefp-1 can bond to non-adhesive graphene by forming hydrogen bonds and pi-pi interaction non-covalent bonds, which facilitate the formation of a robust Mefp-1/graphene composite film on the carbon steel surface.

Place, publisher, year, edition, pages
MDPI AG, 2021
Keywords
graphene, Mefp-1, corrosion, adhesion, infrared spectroscopy
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-304870 (URN)10.3390/coatings11101161 (DOI)000711521300001 ()2-s2.0-85116123278 (Scopus ID)
Note

QC 20211115

Available from: 2021-11-15 Created: 2021-11-15 Last updated: 2022-06-25Bibliographically approved
Zhao, J., Wang, D., Zhang, F., Liu, Y., Chen, B., Wang, Z. L., . . . Shi, Y. (2021). Real-Time and Online Lubricating Oil Condition Monitoring Enabled by Triboelectric Nanogenerator. ACS Nano, 15(7), 11869-11879
Open this publication in new window or tab >>Real-Time and Online Lubricating Oil Condition Monitoring Enabled by Triboelectric Nanogenerator
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2021 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 15, no 7, p. 11869-11879Article in journal (Refereed) Published
Abstract [en]

An intelligent monitoring lubricant is essential for the development of smart machines because unexpected and fatal failures of critical dynamic components in the machines happen every day, threatening the life and health of humans. Inspired by the triboelectric nanogenerators (TENGs) work on water, we present a feasible way to prepare a self-powered triboelectric sensor for real-time monitoring of lubricating oils via the contact electrification process of oil-solid contact (O-S TENG). Typical intruding contaminants in pure base oils can be successfully monitored. The O-S TENG has very good sensitivity, which even can respectively detect at least 1 mg mL(-1) debris and 0.01 wt % water contaminants. Furthermore, the real-time monitoring of formulated engine lubricating oil in a real engine oil tank is achieved. Our results show that electron transfer is possible from an oil to solid surface during contact electrification. The electrical output characteristic depends on the screen effect from such as wear debris, deposited carbons, and age-induced organic molecules in oils. Previous work only qualitatively identified that the output ability of liquid can be improved by leaving less liquid adsorbed on the TENG surface, but the adsorption mass and adsorption speed of liquid and its consequences for the output performance were not studied. We quantitatively study the internal relationship between output ability and adsorbing behavior of lubricating oils by quartz crystal microbalance with dissipation (QCM-D) for liquid-solid contact interfaces. This study provides a real-time, online, self-powered strategy for intelligent diagnosis of lubricating oils.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
Keywords
lubricating oils, condition monitoring, triboelectric nanogenerator, TENG, smart machines
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-300344 (URN)10.1021/acsnano.1c02980 (DOI)000679406500079 ()34170109 (PubMedID)2-s2.0-85110304367 (Scopus ID)
Note

QC 20210831

Available from: 2021-08-31 Created: 2021-08-31 Last updated: 2025-02-14Bibliographically approved
Bian, Z., Zhang, L., Wu, S., He, F., Zhang, F., Pan, J. & Xie, G. (2021). Temperature effect on mechanical strength and frictional properties of polytetrafluoroethylene-based core-shell nanocomposites. Journal of Applied Polymer Science, 138(9), Article ID e49929.
Open this publication in new window or tab >>Temperature effect on mechanical strength and frictional properties of polytetrafluoroethylene-based core-shell nanocomposites
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2021 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 138, no 9, article id e49929Article in journal (Refereed) Published
Abstract [en]

Polytetrafluoroethylene (PTFE) has shown an outstanding lubricity as a solid lubricant, but its application is limited due to its low-mechanical strength and high-wear rate. In this study, core-shell nanoparticles were synthesized using PTFE as the core and polymethylmethacrylate (PMMA) as the shell. The formed core-shell nanocomposites by leveraging the core-shell nanoparticles as basic structural units exhibit remarkable enhancement on uniformity, tensile strength, and wear resistance, compared to mechanically mixed composites with the same composition. Our experiments demonstrated the following results: (1) Owing to the excellent uniformity, the maximum tensile strength of core-shell nanocomposites was 62 MPa, three times higher than that of mechanically mixed composites. (2) The composite matrix formed by PMMA shell had better reinforcement and protection effect on inner PTFE phase, resulting in a reduced wear rate of 0.3 × 10−5 mm3/(N m), one order of magnitude lower than that of mechanically mixed composites. (3) The friction coefficient and interfacial mechanical properties of the core-shell nanocomposites at different temperatures have been systematically studied to get insights into lubrication mechanisms. It is proved that the temperature can decrease the modulus and increase the interfacial adhesion as well as the loss tangent of the core-shell nanocomposites, thus affecting the lubrication properties in multiple ways. 

Place, publisher, year, edition, pages
Wiley, 2021
Keywords
Core shell nanoparticles, Core-shell nanocomposites, Friction, Friction coefficients, Frictional properties, Interfacial adhesions, Interfacial mechanical properties, Lubrication mechanism, Lubrication property, Nanocomposites, Nanoparticles, Polytetrafluoroethylene (PTFE), Polytetrafluoroethylenes, Shells (structures), Solid lubricants, Synthesis (chemical), Tensile strength, Wear of materials, Wear resistance, emulsion polymerization, friction, wear and lubrication
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-284896 (URN)10.1002/app.49929 (DOI)000569913100001 ()2-s2.0-85091027674 (Scopus ID)
Note

QC 20250313

Available from: 2020-12-09 Created: 2020-12-09 Last updated: 2025-03-13Bibliographically approved
Guo, L., Liu, D., Chen, W., Yang, J., Tan, J., Yu, R. & Zhang, F. (2020). 2-Cyanopyridine as a corrosion inhibitor for mild steel: An in silico study. In: AIP Conference Proceedings: . Paper presented at 2nd International Symposium on Mechanics, Structures and Materials Science, MSMS 2020, 28 March 2020 through 29 March 2020. American Institute of Physics Inc.
Open this publication in new window or tab >>2-Cyanopyridine as a corrosion inhibitor for mild steel: An in silico study
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2020 (English)In: AIP Conference Proceedings, American Institute of Physics Inc. , 2020Conference paper, Published paper (Refereed)
Abstract [en]

The corrosion of mild steel in service environments is a complex and random phenomenon. Using inhibitors is a simple, inexpensive, and effective anticorrosion approach. In this work, the inhibition performance of 2-Cyanopyridine (CP) against the corrosion of mild steel in acid solution was investigated by means of computer simulation. Some key properties such as solubility, toxicity were calculated and analyzed. Density functional theory (DFT) calculations was employed to gain insights into the adsorption behavior and inhibition mechanism leading to the formation of a protective film. Our findings will contribute to the development and application of novel corrosion inhibitors.

Place, publisher, year, edition, pages
American Institute of Physics Inc., 2020
Keywords
2-Cyanopyridine, Corrosion Inhibitor, Mild steel, Theoretical Simulation
National Category
Surface- and Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-286480 (URN)10.1063/5.0014573 (DOI)2-s2.0-85091938441 (Scopus ID)
Conference
2nd International Symposium on Mechanics, Structures and Materials Science, MSMS 2020, 28 March 2020 through 29 March 2020
Note

QC 20201217

Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2025-02-09Bibliographically approved
Zhang, F., Örnek, C., Nilsson, J.-O. -. & Pan, J. (2020). Anodisation of aluminium alloy AA7075 – Influence of intermetallic particles on anodic oxide growth. Corrosion Science, 164, Article ID 108319.
Open this publication in new window or tab >>Anodisation of aluminium alloy AA7075 – Influence of intermetallic particles on anodic oxide growth
2020 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 164, article id 108319Article in journal (Refereed) Published
Abstract [en]

Microstructure and Volta-potential analyses were conducted to characterise intermetallic-particles (IMPs) in AA7075-T5. EIS and AFM were applied under operando-conditions to investigate anodisation processes. IMPs have pronounced influence on the growth of anodic aluminium oxide (AAO) films resulting in low charge-transfer resistance. Cu-bearing constituents show cathodic-character, whereas Mg2Si and MgZn2 particles show anodic-character. During anodisation, Al7Cu2Fe remain stable with peripheral-dissolution around boundary. De-alloying of S-phase particles leads to the detachment. Mg2Si undergoes de-alloying at low potential, and re-passivation at high potential. MgZn2 dissolves entirely upon anodization. Localised-dissolution in large-IMPs boundaries or nanometre-sized IMPs facilitates bubble evolution, confirming local breakdown of barrier-layer.

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
Keywords
Anodization, In-situ EC-AFM, Intermetallic particles, Localised dissolution, Operando EIS, SKPFM, Alloying, Alumina, Aluminum alloys, Aluminum oxide, Anodic oxidation, Binary alloys, Charge transfer, Dealloying, Dissolution, Intermetallics, Iron alloys, Oxide films, Silicon alloys, Ternary alloys, Anodizations, Inter-metallic particle, Localised, Operando, Magnesium alloys
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-268382 (URN)10.1016/j.corsci.2019.108319 (DOI)000515204200017 ()2-s2.0-85075390610 (Scopus ID)
Note

QC 20200423

Available from: 2020-04-23 Created: 2020-04-23 Last updated: 2022-10-24Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5180-9895

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