MOF‐Based Hierarchical Structures for Solar‐Thermal Clean Water Production

Ma, Qinglang; Yin, Pengfei; Zhao, Meiting; Luo, Zhiyong; Huang, Ying; He, Qiyuan; Yu, Yifu; Liu, Zhengqing; Hu, Zhaoning; Chen, Bo; Zhang, Hua

doi:10.1002/adma.201808249

Cited by 258 publications

(152 citation statements)

References 42 publications

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“…Recently, water purification based on interfacial solar evaporation emerges as a promising technology to extract freshwater from various water resources (seawater, sewage, brackish water, etc.). [ 4–6 ] One of the critical elements of this technology is solar absorbers, which should be efficient and broadband in light absorption, scalable in fabrication, and competitive in costs. Plasmonic nanoparticles among various solar absorbers have aroused great attention due to their resonant absorption and localized heating effect.…”

Section: Figurementioning

confidence: 99%

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

Yang

Dong

et al. 2020

Advanced Materials

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absorbers have aroused great attention due to their resonant absorption and localized heating effect. [7][8][9] Nevertheless, this resonant absorption inherently features a narrow bandwidth, which is usually advantageous for applications such as biosensors [10] and resonant energy transfer, [11] but disadvantageous for broadband light absorption. [12,13] Some complex and delicate plasmonic metastructures were thus designed to hybridize proximate surface plasmons [12] or to support multiple resonances [13] in order to broaden the absorption bandwidth. However, the noble metals (i.e., Au and Ag) for plasmonic absorption along with the complicated fabrication procedures are undesirable for large-scale and full-spectrum (300-2500 nm) solar energy harvesting. [14] Zhou et al. creatively fabricated an all-aluminum hybrid plasmonic membrane, which was lowcost and enabled efficient broadband solar absorption. [15] The broadband plasmonic absorber was based on closely packed Al nanoparticles along the side walls of nanopores to induce a plasmon hybridization effect and high-density plasmonic resonances. [15] Among the several mechanisms that cause light absorption in metals, [16] interband transitions (IBTs) are single-electron excitations [17] from occupied levels in one band to unoccupied levels in another band, [18] in contrast to the collectively coherent excitation of electrons for plasmonic absorption. [19] IBTs intrinsically have a broadband attribute because photons the energy of which surpasses the interband threshold of a metal can excite IBTs. This makes IBTs very suitable for full-spectrum solar energy utilization, especially when massive IBTs over the entire solar spectrum can be supported by some transition metals (e.g., Ni, Pd, and Pt) with a high density of electronic states (DOS) near their Fermi levels. [20][21][22] In this work, we designed a Ni-cellulose hybrid metamaterial (NCM) that employs IBTs as the dominant optical absorption mechanism over the entire solar spectrum (Figures S1 and S2, and Note S1 for the detailed demonstration, Supporting Information). Nickel supports strong IBTs in very low energy regions (≈0.5 eV), which greatly increase optical absorption in the near-infrared spectrum compared to plasmonic metals (Au, Ag, and Cu). We densely embedded Ni nanoparticles into the nanogaps of cellulose microfibers via a seed-mediated and nanoconfined growth. This nanoconfinement effect can inhibit Sophisticated metastructures are usually required to broaden the inherently narrowband plasmonic absorption of light for applications such as solar desalination, photodetection, and thermoelectrics. Here, nonresonant nickel nanoparticles (diameters < 20 nm) are embedded into cellulose microfibers via a nanoconfinement effect, producing an intrinsically broadband metamaterial with 97.1% solar-weighted absorption. Interband transitions rather than plasmonic resonance dominate the optical absorption throughout the solar spectrum due to a high density of electronic states near the Fermi level of nickel. Fiel...

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Section: Figurementioning

confidence: 99%

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

Yang

Dong

et al. 2020

Advanced Materials

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“…Meanwhile, salt deposition on the surface of the absorber and the interior of the insulator will reduce light absorption and thermal insulation, resulting in deterioration of the evaporation performance and long‐term instability . Moreover, although existing literatures have reported high solar‐vapor energy efficiency (i.e., the proportion of a given quantity of solar energy used for vapor production) over 90%, the solar‐water energy efficiency (i.e., the proportion of a given quantity of solar energy used for clean water production which is effectively collected) and clean water collection ratio still fall at very low levels of 22% and 39.3%, respectively, far below the expectations.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Solar Waterways: Plasma‐Enabled Self‐Cleaning Nanoarchitectures for Energy‐Efficient Desalination

Xiong

Yang

et al. 2019

Advanced Energy Materials

122

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Evaporating seawater and separating salt from water is one of the most promising solutions for global water scarcity. State‐of‐the‐art water desalination devices combining solar harvesting and heat localization for evaporation using nanomaterials still suffer from several issues in energy efficiency, long‐term performance, salt fouling, light blocking, and clean water collection in real‐world applications. To address these issues, this work devises plasma‐enabled multifunctional all‐carbon nanoarchitectures with on‐surface waterways formed by nitrogen‐doped hydrophilic graphene nanopetals (N‐fGPs) seamlessly integrated onto the external surface of hydrophobic self‐assembled graphene foam (sGF). The N‐fGPs simultaneously transport water and salt ions, absorb sunlight, serve as evaporation surfaces, then capture the salts, followed by self‐cleaning. The sGF ensures effective thermal insulation and enhanced heat localization, contributing to high solar‐vapor efficiency of 88.6 ± 2.1%. Seamless connection between N‐fGPs and sGF and self‐cleaning of N‐fGP structures by redissolution of the captured salts in the waterways lead to long‐term stability over 240 h of continuous operation in real seawater without performance degradation, and a high daily evaporation yield of 15.76 kg m−2. By eliminating sunlight blocking and guiding condensed vapor, a high clean water collection ratio of 83.5% is achieved. The multiple functionalities make the current nanoarchitectures promising as multipurpose advanced energy materials.

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“…[23] Significantly, MOF crystals are typically prepared by spontaneous self-assembly process which can grow and form hybrid materials on various templates with complex supramolecular architectures. [24] Recently, direct growth of MOF array on different templates are widely investigated in various fields, such as catalytic water splitting, [25,26] solar-thermal water production, [27] chemiresistive sensor, [28] superhydrophobicity. [29] These MOF hybrid arrays possess pre-designed 3D hierarchical oriented architectures which can efficiently prohibit the aggregation of the nanoparticles and improve the electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Template‐Directed Growth of Hierarchical MOF Hybrid Arrays for Tactile Sensor

Zhou

Zhang

Xiong

et al. 2020

Adv Funct Materials

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Recently, conductive metal−organic frameworks (MOFs) as the active material have provided broad prospects for electronic device application. The positioning technologies for MOFs enable the fabrication of novel microstructures, which can modulate the morphology of the material and tune the properties for the targeted application. Herein, a template‐method is used to synthesize the hierarchical structure of MOF hybrid array (MHA) on copper mesh (MHA@Mesh) for flexible sensor. Finite element method (FEM) results indicate that the 3D hierarchical MHA@Mesh can mimic the micro/nanoscale structure of human skin, which enables an interlocking contact. MHA@Mesh‐based flexible sensor presents rapid response rate (<1 ms) and high sensitivity (up to 307 kPa−1) which is 20 times higher than that of MHA@Foil‐based sensor (15 kPa−1). The flexible pressure device could be applied to monitor the finger motion and human pulses. Moreover, the music recognition can be performed by integrating the MOFs hardware sensors with machine learning algorithms. Overall, this design concept of 3D hierarchical microarray structures demonstrates potential in the fields of wearable technologies and human–machine interfaces.

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MOF‐Based Hierarchical Structures for Solar‐Thermal Clean Water Production

Cited by 258 publications

References 42 publications

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

Multifunctional Solar Waterways: Plasma‐Enabled Self‐Cleaning Nanoarchitectures for Energy‐Efficient Desalination

Template‐Directed Growth of Hierarchical MOF Hybrid Arrays for Tactile Sensor

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