Bio-inspired and biomimetic materials towards solar energy...
Transcript of Bio-inspired and biomimetic materials towards solar energy...
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Bio-inspired and biomimetic materials towards solar energy utilization
Han Zhou, Tongxiang Fan, Di Zhang
Email: [email protected] State Key Lab of Metal Matrix Composites,
Shanghai Jiao Tong University, Shanghai, China Apr 7th , 2016 1
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OUTLINE Bioinspired Materials
Bioinspired systems towards solar energy
utilization Artificial Leaf for artificial photosynthesis Butterfly wing-inspired efficient NIR harvesting system
Summary
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Biological inspiration Mechanical Optics Thermal Electronic
Magnetic Sensory
Energy harvesting
transportation Surface property Self-x ability
Biological systems give us many inspirations to mimic in many areas such as their mechanical, optical, electronic, magnetic properties and so forth.
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Insects Plants
Light harvesting Light manipulation Hydrophilic hydrophobic
Photosynthesis Mass transportation Mechanical property Hydrophilic/hydrophobic
drag reducing Self-cleaning Hydrophobic Light manipulation
Fish
How to design NEW materials? Nature Knows
Natural Materials: Simple components Complicated structures Powerful functions
Bioinspired Materials
The functions are highly related to their structures.
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Metal Oxides
Three-Dimensional Hierarchical
Keep Morphology Replace Components Mimic Functions Reveal Mechanisms Build Models Biomimetic synthesis
&Applications
Biology
H. Zhou, T. X. Fan, D. Zhang, et al. Adv. Mater, 2010 H. Zhou, T. X. Fan, D. Zhang, et al. Scientific Reports, 2013 H. Zhou, J. Ye, et al. Nanoscale, 2015
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2H2O O2+ 2 “H2” 2 “H2”+2CO2 [CH2O] Fuels
“CO2 Reduction” is more URGENT than “water splitting”
Natural Systems Artificial Systems
Artificial Photosynthesis: from solar-to-fuels
Photocatalytic water splitting CO2 reduction
Solar Energy
in natural photosynthesis, there are two reactions: water splitting and CO2 fixation. In artificial systems, there are also two reactions.
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CO2 Photoreduction
Challenges Low efficiencies Limited photocatalysts Use of sacrificial reducing agents
it’s important to develop a Promising photocatalysts/or system with: Efficient mass flow network Unique 3D architectures for light harvesting Suitable catalysts with strong reducing over-potential
How to design optimized architectures?
Turn to NATURE for inspiration
Materials: TiO2
Titanates: ATiO3 (A= Sr, Ca, Ba, Pb), ALa4 Ti4 O15 (A = Ca, Sr, Ba)
Niobates: HNb3 O8 , InNbO4 , ANbO3 (A = Li, Na, K) Tantalates: Ta2 O5 , InTaO4 , ATaO3 (A = Li, Na, K) Vanadates: BiVO4 ,Fe2V4O13
Tungstates: WO3 W18O49 Bi2WO6
d10 metal oxides includes In(OH)3 Gallates: Ga2O3 , ZnGa2 O4 , CuGaO2
Germinates: Zn2GeO4 ,In2Ge2O7, solid solutions: (Zn1+x Ge)(N2Ox) and (Ga1−x Znx )(N1−x Ox ). Metal sulfides: CdS and ZnS, MnS, Polymers : g-C3N4
Strategies: Band-Structure Engineering Nanostructuralization Surface Oxygen Vacancy Engineering Meso-/Microporous Structuralization Crystal Facet Engineering Z-Scheme Construction …….. W. G. Tu, Y. Zhou, Z. G. Zou, Adv. Mater., 26, 4607 (2014).
Mori, K., Yamashita, H. & Anpo, M., RSC Advances 2, 3165 (2012). Yan, S. C., Ye, J.H., Zou, Z. G. et al, Angew. Chem. Int. Ed. 49, 6400 (2010). Iizuka, K., et al. J. Am. Chem. Soc. 133, 20863 (2011).
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A natural leaf is a synergy of elaborated structures and functional components in order to produce a highly complex machinery for photosynthesis
Natural Leaf
Perfect Solution example for Energy and Environment
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the focusing of light by the lens-like epidermal cells
the multiple scattering and absorbing of light within the veins porous architectures
the propagating of light in the columnar cells in palisade parenchyma acting like light guides
Bundle sheath extensions can transfer light into deeper laye
the enhanced effective light pathlength and light scattering by the less regularly arranged spongy mesophyll cells
the efficient light-harvesting and fast charge separation in the high surface area three-dimensional constructions of interconnected nano-layered thylakoid cylindrical stacks in chloroplast
The structure of leaf is favorable for light harvesting.
H. Zhou, X. Li, T. Fan, et al. Adv. Mater, 2010
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another important feature of leaf is that the vein network is favorable for efficient water transportation.
Efficient water transportation
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The 3D hierarchical architectures with high porosity, high connectivity and high surface areas are favorable for gas diffusion
(a) SEM image of the cross section of venation architecture
(b) optical image of venation networks.
(c) SEM image of mesophyll cells.
(d) magnified image of (a). (e) 3D schematic illustration
of venation architecture. (f) SEM image of of the cross
section of venation architecture axially.
Efficient Gas Diffusion
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Hierarchical porous perovskite titanates (ATiO3, A = Sr, Ca, and Pb) with three-dimensional architectures for enhanced mass flow
CO2 photoreduction (using Water as an electron donor )
Main Idea Typical example Natural Leaf
General method
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Han Zhou et al. Scientific reports, 2013, 3, 1667
Leaf-architectured 3D Artificial Photosynthetic System of Perovskite Titanates
The have similar processes: light harvesting, gas diffusion and gas conversion. In artificial system, we use water and CO2 to produce hydrocarbon fuels.
comparison between natural system and artificial system
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Natural Photosynthetic system Artificial Photosynthetic system
Fresh leaves
Synthetic procedure
Diluted Acid
Wash
Precusors A(CH3COO)2+Ti(OC4H9)4
A=Sr, Ca, Pb
Mix/stir
Infiltration
wash, dry
Heat 100ºC, 24h
Calcination 600ºC, 8h, O2 atmosphere
similar morphologies between natural leaves and artificial ones.
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CO2 Photoreduction CO2+H2O+Photocatalysts CO+CH4
Bare STO evolve CO and CH4 as the main products in the absence of any sacrificial agents.
The evolution amount of CO is larger than that of CH4 for bare STO leaf-architectured APS of STO has about 2 fold improvement in
activities than the corresponding powder constituents of APS and referenced STO synthesized without templates
Bare SrTiO3
Gas phase reaction
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CO2 Photoreduction Same SBET=72.6 m2g-1
Different morphology
After grounding and sonication
Mercury intrusion porosimetry
The APS of STO and the powder constituents have the same surface area, but different morphology because of grounding and sonication
The activity enhancement could be attributed to the Enhanced light harvesting and Efficient gas diffusion introduced by the large quality of macropores.
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Pt Au
Ag Cu
Control experiment
Durability
Au serves as a suitable cocatalyst while Pt not working. Control experiment (without light, catalysts, H2O and CO2) prove that H2O supplies
protons, CO2 offers a carbon source, and the photocatalyst gives the redox potentials for the whole reaction to finally produce CO and CH4.
CO2 Photoreduction
Han Zhou et al. Scientific reports, 2013, 3, 1667
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Artificial systems
Sustainable hydrocarbon fuels
(CH4, CO, H2…)
CO2+H2O
Photosynthesis
Artificial Photosynthesis O2
Light
Light
CO2+H2O
(CH2O)n+O2 Biomass, food, fossil fuels
Potential for the realization of carbon cycle.
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OUTLINE Bioinspired Materials
Bioinspired systems for energy conversion Artificial Leaf for artificial photosynthesis Butterfly wing-inspired efficient NIR harvesting system
Summary
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Butterfly wing-inspired Plasmonic Nanoarchitectured Hybrid System for efficient NIR utilizaton
The utilization of NIR light is very important.
NIR (near infrared light) accounts for about 40% of solar spectrum,
One main challenge is the development of novel strategies for activity promotion and new basic mechanisms for NIR response.
Problems limited NIR active photocatalysts (e.g. Cu2(OH)PO4, WS2, BiErWO6, defect-induced Bi2WO6, H-WO3, H-TiO2, etc.), low efficiency restricted mechanisms •upconversion process •carbon quantum dots doping •heterostructure design •oxygen vacancies induction •localized surface plasmon resonance nanoparticles modification etc.
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Learn from nature: Nature’s way to utilize NIR light
Some photosynthetic bacteria can use NIR light for photosynthesis. Black scales of some snake skins can absorb NIR light because of their hierarchical
patterns However, these NIR harvesting mechanisms in biology have never been applied for
the design of new efficient NIR responsive systems.
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Butterfly wing structures
Thus, the exploration and understanding of the NIR responsive mechanisms and further integration of bio-inspired 3D architectures with NIR-active photocatalysts for biomimetic design are highly appealing.
certain colored scales of butterfly wings are able for NIR harvesting due to their photonic crystals
Butterfly wings have optical properties (e.g. structural color, circular polarization, etc.) because of their unique, structures (e.g. multilayer, photonic crystals, double-facet microlens and so forth)
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Plasmonic metallic nanostructures
Nature Mater. 2011, 10, 911-921.
plasmonic metallic nanostructures can serve as antennas to absorb visible-to-NIR light through localized surface plasmon resonance (LSPR)
The absorption wavelength could be adjusted by tuning the morphologies and sizes of the nanostructures.
Nat. Mater., 2015, 14(6), 567-576
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structure-enhanced bio-inspired Plasmonic Nanoarchitectured Hybrid System for highly far red-to-NIR response
we propose a new strategy, inspired by nature’s NIR light responsive architectures prototypes for an efficient far red-to-NIR plasmonic hybrid photocatalytic system. The system is based on controlled assembly of light-harvesting plasmonic gold nanorods onto a typical photocatalytic unit (bismuth vanadate) with biological 3D architecture designs.
Study the structural effects on the activity promotion Investigate light-matter interaction between plasmonic metal nanostructures
and semiconductors with unique 3D micro/nanoarchitectures
H. Zhou, T. X. Fan, D. Zhang, et al. Scientific Reports, 2016, 6, 20001
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Morphology and Optical Simulation of Butterfly Wings
finite-difference time-domain (FDTD) simulations are performed to investigate the optical property
compared with the slab model, the absorption enhancement at far red-to-NIR wavelengths (700~1200 nm) reaches about 12%, 25%, 15% and 5% respectively
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Development of Bio-inspired Far Red-to-NIR Photocatalytic System
we controlled assemble Au nanorods onto the surfaces of the butterfly wing derived BVO (BiVO4, bismuth vanadate) system.
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Simulative and Experimental Optical Absorption Properties of Bio-inspired Systems
The absorption peak of Au NRs on BVO wing reaches almost twice that of non-
structured counterparts, suggesting the remarkable enhancement of optical absorption caused by the butterfly wings’ 3D architectures. (experiment accords with simulation).
the Au nanorods we synthesized have an absorption peak around 750nm.
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Simulative LSPR-induced electric-field intensity
The electric field intensity is extremely strengthened by the architecture (RE = |E|/|E0|): •RE reaches 75.89 in the holes of the structure (blue line);
•RE reaches 30.6 on the surface of the structure (red line);
•RE reaches 20.83 on the surface of BVO slab (black line).
the rate of electron-hole formation is proportional to the local intensity of the electric field
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Photocatalytic Properties IPA Photodegradation and photoelectrochemical performance of materials with the structure inherited by butterfly wings approximated 2.85 times and 2 times than the non-structural ones.
Structural effects: (1) Enhancing far red-to-NIR harvesting, up to 25%; (2) Enhancing electric-field amplitude of localized surface plasmon to more than 3.5 times than that of the nonstructural one, which promotes the rate of electron-hole pair formation, thus substantially reinforcing photocatalysis
Photocatalytic IPA degradation
H. Zhou, T. X. Fan, D. Zhang, et al. Scientific Reports, 2016, 6, 20001
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Butterfly wing-inspired efficient NIR utilization system
Artificial Leaf for artificial photosynthesis
Bioinspired Design
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Design is Nature!
Thank you! Welcome to State Key Lab of Metal Matrix Composites
Shanghai Jiao Tong University