Serosa-Mimetic Nanoarchitecture Membranes for Highly Efficient Osmotic Energy Generation

Man, Zengming; Safaei, Javad; Zhang, Zhen; Wang, Yizhou; Zhou, Dong; Li, Peng; Zhang, Xiaogang; Jiang, Lei; Wang, Guoxiu

doi:10.1021/jacs.1c07392

Cited by 89 publications

(78 citation statements)

References 48 publications

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“…RED-based energy conversion is based on charge separation via ion-permeation membranes to convert the chemical potential/temperature gradient into electricity. Moreover, the membrane charge density, which induces the formation of an electric double layer (EDL), is key to determining the ion conductance and charge screening ability and, consequently, the thermo-osmotic conversion efficiency 17 – 27 . Elucidating the molecular-level operation of RED membranes is necessary to advance practical implementation of this technology.…”

Section: Introductionmentioning

confidence: 99%

Anomalous thermo-osmotic conversion performance of ionic covalent-organic-framework membranes in response to charge variations

et al. 2022

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Increasing the charge density of ionic membranes is believed to be beneficial for generating high output osmotic energy. Herein, we systematically investigated how the membrane charge populations affect permselectivity by decoupling their effects from the impact of the pore structure using a multivariate strategy for constructing covalent-organic-framework membranes. The thermo-osmotic energy conversion efficiency is improved by increasing the membrane charge density, affording 210 W m−2 with a temperature gradient of 40 K. However, this enhancement occurs only within a narrow window, and subsequently, the efficiency plateaued beyond a threshold density (0.04 C m−2). The complex interplay between pore-pore interactions in response to charge variations for ion transport across the upscaled nanoporous membranes helps explain the obtained results. This study has far-reaching implications for the rational design of ionic membranes to augment energy extraction rather than intuitively focusing on achieving high densities.

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Section: Introductionmentioning

confidence: 99%

Anomalous thermo-osmotic conversion performance of ionic covalent-organic-framework membranes in response to charge variations

et al. 2022

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“…An important component of the RED system is ion-selective membranes, as the permselectivity of membrane directly determines the energy conversion performance. Till now, extensive studies have been conducted, focusing on the high permselectivity of cation-selective membranes in RED systems ( Zhang et al, 2015 ; Zhang et al, 2017 ; Xiao et al, 2019 ; Xin et al, 2019 ; Xin et al, 2020 ; Man et al, 2021 ). However, little research has been made on anion-selective membranes, which is to say, ignoring the possibility of energy generation with anion gradients.…”

Section: Introductionmentioning

confidence: 99%

Bio-Inspired Salinity-Gradient Power Generation With UiO-66-NH2 Metal-Organic Framework Based Composite Membrane

Pan

et al. 2022

Front. Bioeng. Biotechnol.

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Salinity-gradient directed osmotic energy between seawater and river water has been widely considered as a promising clean and renewable energy source, as there are numerous river estuaries on our planet. In the past few decades, reverse electrodialysis (RED) technique based on cation-selective membranes has been used as the key strategy to convert osmotic energy into electricity. From this aspect, developing high-efficiency anion-selective membranes will also have great potential for capturing osmotic energy, however, remains systematically unexplored. In nature, electric eels can produce electricity from ionic gradients by using their “sub-nanoscale” protein ion channels to transport ions selectively. Inspired by this, here we developed a UiO-66-NH2 metal-organic framework (MOF) based anion-selective composite membrane with sub-nanochannels, and achieved high-performance salinity-gradient power generation by mixing artificial seawater (0.5 M NaCl) and river water (0.01 M NaCl). The UiO-66-NH2 metal-organic framework based composite membranes can be easily and economically fabricated with dense structure and long-term working stability in saline, and its performance of power generation can also be adjusted by pH to enhance the surface charge density of the MOF sub-nanochannels. This study will inspire the exploitation of MOFs for investigating the sub-nanochannel directed high-performance salinity-gradient energy harvesting systems based on anion-selective ion transport.

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“…The extraction of osmotic energy has been increasingly focused on in the past decade. − Researchers have predicted that 0.8 kW of Gibbs free energy can be obtained from the controlled mixing of per cubic meter of river water and seawater, which is sufficient to satisfy most of the energy requirements for society . Reverse electrodialysis (RED) has proven to be an efficient technology for directly harvesting this energy. − Despite enormous research efforts, full-scale utilization of RED has thus far failed in realizing satisfactory output power densities, limiting its practical application; this is primarily because of the concentration polarization (CP) of ionic membranes, which are at the heart of RED-based saline batteries. − Among the various parameters that determine the performance of ionic membranes, charge density is a particularly critical factor.…”

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confidence: 99%

Integration of Thermoelectric Conversion with Reverse Electrodialysis for Mitigating Ion Concentration Polarization and Achieving Enhanced Output Power Density

et al. 2022

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Concentration polarization (CP) is a ubiquitous phenomenon in membrane separation that is possibly responsible for the decline in overall efficiency. However, no quantitative connection between the key membrane parameters and the degree of CP has been established. In this study, the variation in permselectivity during CP was comprehensively elucidated using isostructural covalent organic framework (COF) membranes with varied charge densities. A volcano-like plot of output power density against charge population was obtained, in contrast to the conventional presumptions regarding an increase in the membrane charge density leading to an enhancement in permselectivity, and a consequent increase in osmotic voltage. The CP-induced detrimental effects were considerably mitigated by imposing a temperature gradient on the solutions, which led to an increase in the thermophoretic mobility of ions. The reverse electrodialysis (RED) device with alleviated CP yielded an output power density of up to 24.7 mW cm–2 with a temperature difference of ∼40 K; this value far exceeds the commercial benchmark, thus establishing a new criterion for RED batteries. These results outline a previously undiscovered benefit for linking thermoelectric conversion and RED to realize advanced energy-conversion technologies.

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Serosa-Mimetic Nanoarchitecture Membranes for Highly Efficient Osmotic Energy Generation

Cited by 89 publications

References 48 publications

Anomalous thermo-osmotic conversion performance of ionic covalent-organic-framework membranes in response to charge variations

Anomalous thermo-osmotic conversion performance of ionic covalent-organic-framework membranes in response to charge variations

Bio-Inspired Salinity-Gradient Power Generation With UiO-66-NH2 Metal-Organic Framework Based Composite Membrane

Integration of Thermoelectric Conversion with Reverse Electrodialysis for Mitigating Ion Concentration Polarization and Achieving Enhanced Output Power Density

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