| 1. |
- Fan, Lizhou, et al.
(författare)
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Holistic functional biomimetics : a key to make an efficient electrocatalyst for water oxidation
- 2023
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Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 11:20, s. 10669-10676
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Guo, Yu, et al.
(författare)
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Water oxidation catalysis in natural and artificial photosynthesis
- 2023
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Ingår i: Comprehensive Inorganic Chemistry III, Third Edition. - : Elsevier BV. ; , s. 317-355
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Energy shortage and environmental pollution limit the sustainable development of human beings. Water, as a clean and renewable resource, provides a solution for sustainable energy conversion from water oxidation catalysis. Lessons should be learned from nature to explore efficient artificial catalysts. In this chapter, we will review recent major progress in natural photosynthesis, from the structure and functions to the mechanisms for the water-oxidizing center of the biological enzyme. Later, the development of molecular and material water oxidation catalysts is discussed, with a focus on the mechanisms and rational catalyst design.
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| 3. |
- Kaya, Kerem, et al.
(författare)
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Programmable Matter with Free and High-Resolution Transfiguration and Locomotion
- 2024
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Ingår i: Advanced Functional Materials. - : Wiley. - 1616-301X .- 1616-3028. ; 34:14
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Tidskriftsartikel (refereegranskat)abstract
- “Hot flow in the coldchanges shape in a dead worldcomes matter to life”Programmable matter that allows free shape transfiguration and locomotionon command promises ubiquitous access to objects or functions of interest.Current approaches for the autonomous reshaping of solid objects (smartmaterials, soft actuators, modular robotics) are limited in spatial resolution andshape. Solid-liquid phase change pumping as a mechanism for the contactlesstransfiguring and locomotion of solid objects is introduced. Thin objects aredeformed into any intended shape with sub-millimeter resolution and the abilityto freely change their topology is demonstrated, including adding or removingholes, splitting and merging. The unique locomotion of objects throughmillimeter-sized constrictions narrower than their body size is demonstrated,followed by restoring the original shape. This approach opens up avenues fordeveloping autonomous programmable matter with free shape transfiguration.
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| 4. |
- Longhini, Alberta, et al.
(författare)
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Elastic Context : Encoding Elasticity for Data-driven Models of Textiles
- 2023
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Ingår i: Proceedings - ICRA 2023. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1764-1770
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Konferensbidrag (refereegranskat)abstract
- Physical interaction with textiles, such as assistivedressing or household tasks, requires advanced dexterous skills.The complexity of textile behavior during stretching and pullingis influenced by the material properties of the yarn and bythe textile’s construction technique, which are often unknownin real-world settings. Moreover, identification of physicalproperties of textiles through sensing commonly available onrobotic platforms remains an open problem. To address this,we introduce Elastic Context (EC), a method to encode theelasticity of textiles using stress-strain curves adapted fromtextile engineering for robotic applications. We employ EC tolearn generalized elastic behaviors of textiles and examine theeffect of EC dimension on accurate force modeling of real-worldnon-linear elastic behaviors.
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