Energy Harvesting from Atmospheric Humidity by a Hydrogel-Integrated Ferroelectric-Semiconductor System

Yang, Lin; Nandakumar, Dilip Krishna; Miao, Linqing; Suresh, L. Padma; Zhang, Danwei; Xiong, Tao; Vaghasiya, Jayraj V.; Kwon, Ki Chang; Tan, Swee Ching

doi:10.1016/j.joule.2019.10.008

Cited by 100 publications

(75 citation statements)

References 41 publications

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“…Moreover, analysis of the frequency-dependent CIMPS response gives deeply information about the competition of electron-hole's recombination and transfer at photoanode/electrolyte interface. [41,42] Figure 6b shows a Nyquist complex photocurrent of P-In 2 S 3 (s) at various applied potentials, where K trans and K rec are the surface charge transfer and recombination rate constants. In this plot, the low-frequency intercept of real photocurrents indicates the charge transfer efficiency K trans /(K trans þ K rec ).…”

Section: Resultsmentioning

confidence: 99%

“…The lower surface work function in P-In 2 S 3 (s) could induce a built-in electric field and make the E F shift to a higher energy level by the substitutional P dopants. [41] The higher E F could induce the accumulation of positive charges in the depletion region at the surface of P-In 2 S 3 (s), in other words, hybridized state could broaden the depletion width, which generates built-in potential and bends the band structure upward, and therefore the dynamic of hole's transfer to surface is reinforced. [4] Furthermore, P-In 2 S 3 (s) clarifies the highest incident phototo-electron conversion efficiencies (IPCE), which is in a good agreement with the UV-vis absorption spectra and consistent with the enhanced photocurrent (Figure 8a).…”

Section: Resultsmentioning

confidence: 99%

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Tuning Electronic Structure of 2D In₂S₃ via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation

et al. 2020

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sluggish four electrons transfer process. [4] Two-dimensional (2D) materials present the advantages of a short exciton diffusion distance and a thickness less than the width of the space charge region at solid/liquid interfaces, thus potentially serve as the excellent photoanodes. [5,6] Indium sulfide (In 2 S 3) is a broad-spectral 2D material with ordered vacancy spinel-like structure, the sulfide anions are closely packed in layers, with octahedral-coordinated In cations present within the layers, and tetrahedralcoordinated In cations between them. [7,8] 2D In 2 S 3 is an n-type semiconductor with small size effect, exhibiting large surface area when its size is of nanometers, exposing a high percentage of edges that could produce active surface toward catalytic reaction. The variation of size in nanometer scale could also tune the bandgap based on quantum size and surface effect. [9,10] The common approaches to the fabrication of 2D In 2 S 3 include chemical vapor deposition, hydrothermal, solvothermal, and solgel process, however, precise controlling the dimensions of this compound is still difficult and have not been reported. [11,12] Fortunately, in a solvothermal reaction, the size and shape of the products could be controlled by nucleation and subsequent growth. The homogeneous nucleation limits the formation of nucleation sites and quantity attributing to the diversity of surface energy and nucleation barrier. [13] In 2 S 3 was fabricated by the former researchers usually leads to the large multilayer flakes, [8,14] whereas a lower surface energy can make it easier to grow on seed sites. Therefore, seed-mediated growth has a good control of nucleation density, and thus attaining uniform structure with desired edges. Introduction of alien atoms to 2D material is an effective way for tuning electrical and optical properties of the host material via orbital hybridization. [15] The Fermi level E F of most n-type semiconductors can be tuned by introducing impurity doping which is capable of causing dramatic changes in their interlayer electrical structure. [16-18] Once the position of hybridized impurity level is near the E F or valence band, it becomes the electrons or holes trap center (e.g., P-CdS and Gd-BiVO 4) and then affects the charge separation. [19-21] The doping pattern of the impurity species in the host materials include interstitial and substitutional sites. If an impurity atom is located in the gap between atoms in the lattice, it often refers to an interstitial doping, whereas an impurity atom substitute at the position of metal or chalcogen

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tuning Electronic Structure of 2D In₂S₃ via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation

et al. 2020

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“…[ 12 ] Amount of atmospheric water is equivalent to 5.2 billion Olympic‐sized pools or more than halved the size of Baltic Sea. [ 13,14 ] The atmospheric water harvesting technology opens up a self‐sustaining source of freshwater that can potentially support millions of drinking needs and agriculture. [ 15,16 ] In this work, to mitigate food and water shortage simultaneously, we have synthesized a hygroscopic copper(II)‐ethanolamine complex (Cu‐complex) to harvest atmospheric water and integrated this material into a fully automated solar‐driven device named SmartFarm, which can utilize harvested water to irrigate the plants daily without manual intervention ( Scheme ).…”

Section: Methodsmentioning

confidence: 99%

A Moisture‐Hungry Copper Complex Harvesting Air Moisture for Potable Water and Autonomous Urban Agriculture

Yang

Zhang

et al. 2020

Advanced Materials

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The earth's atmosphere houses an enormous amount of water, which could be effectively exploited for a plethora of applications. While the development of materials for harnessing this abundant resource has gained impetus in recent years, limited efforts have been devoted to in‐depth research on their agricultural applications. Herein, a novel copper(II)–ethanolamine complex (Cu‐complex), which has a maximum water uptake of up to 300% and a water production rate of 2.24 g g−1 h−1 under natural sunlight, is reported. As a proof‐of‐concept application, using this material, a fully automated and self‐sustainable solar‐powered SmartFarm device is developed. The Cu‐complex harvests atmospheric water during the night, stores the adsorbed water within, and efficiently releases the adsorbed water during the day when the device is exposed to sunlight. The water harvesting and irrigation process can be fine‐tuned to suit different types of plants and local climates for an optimal cultivation. With the SmartFarm in operation, the demand for freshwater for irrigation could be greatly reduced and urban farming techniques such as large‐scale rooftop farming could be promoted with a view of alleviating both water and food scarcity in the near future.

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“…b) Energy band diagram and fabrication of the hydrogel‐integrated ferroelectric semiconductor system. [ 62 ] Water absorption by hydrogel from ambient environment. The energy band diagram for the ferroelectric enhanced charge separation and transfer structure.…”

Section: Green Energy Conversion Devicesmentioning

confidence: 99%

“…This system presented in Figure 4b can generate energy from ambient environment, without any manual input of water or any external electric power. [ 62 ] BiVO 4 was used as the semiconductor for photo absorption and realize the water oxidation. The tetragonal phase of BaTiO 3 served as the ferroelectric, to induce an outward vector of built‐in electric field when provided with a positive polarization.…”

Section: Green Energy Conversion Devicesmentioning

confidence: 99%

Emerging Technologies for Green Energy Conversion and Storage

Zhang

Suresh

Liang

et al. 2021

Advanced Sustainable Systems

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The biggest concern of the decade is to find a way to power the future in the most ecofriendly and green manner, owing to current energy crisis and environmental pollution. A major side effect of conventional technological advancements is the inability to naturally digest and decompose the substances human society has created. This review summarizes green energy conversion and storage devices with a particular focus on recent advancements in emerging technologies. Technical innovations in energy‐related materials, device structures, and new applications are discussed. Furthermore, hybrid energy and self‐charging power systems are discussed in conjunction with recent and future research directions. The multifunctional applications of these energy systems are also emphasized. It is expected that this review will provide a platform to understand the current landmarks and promote further research to broaden the utility of energy devices.

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Energy Harvesting from Atmospheric Humidity by a Hydrogel-Integrated Ferroelectric-Semiconductor System

Cited by 100 publications

References 41 publications

Tuning Electronic Structure of 2D In₂S₃ via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation

Tuning Electronic Structure of 2D In₂S₃ via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation

A Moisture‐Hungry Copper Complex Harvesting Air Moisture for Potable Water and Autonomous Urban Agriculture

Emerging Technologies for Green Energy Conversion and Storage

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Energy Harvesting from Atmospheric Humidity by a Hydrogel-Integrated Ferroelectric-Semiconductor System

Cited by 100 publications

References 41 publications

Tuning Electronic Structure of 2D In2S3 via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation

Tuning Electronic Structure of 2D In2S3 via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation

A Moisture‐Hungry Copper Complex Harvesting Air Moisture for Potable Water and Autonomous Urban Agriculture

Emerging Technologies for Green Energy Conversion and Storage

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Tuning Electronic Structure of 2D In₂S₃ via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation

Tuning Electronic Structure of 2D In₂S₃ via P Doping and Size Controlling Toward Efficient Photoelectrochemical Water Oxidation