The Experts below are selected from a list of 289656 Experts worldwide ranked by ideXlab platform
Shuhua Hou - One of the best experts on this subject based on the ideXlab platform.
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free standing covalent organic framework membrane for high efficiency salinity gradient Energy Conversion
Angewandte Chemie, 2021Co-Authors: Shuhua Hou, Liping Wen, Yunfei Teng, Jianjun Chen, Lei JiangAbstract:Both high ionic conductivity and selectivity of a membrane are required for efficient salinity gradient Energy Conversion. An efficient method to improve Energy Conversion is to align ionic transport along the membrane thickness to address low ionic conductivity in traditional membranes used for Energy harvesting. Here, we fabricate a free-standing covalent organic frameworks membrane (TpPa-SO 3 H) with excellent stability and mechanical properties. This membrane with one-dimensional nanochannels and high charge density demonstrates high ionic conductivity and selectivity. Its power density can reach up to 5.9 W/m 2 by mixing artificial seawater and river water. Based on our results, we propose that the high Energy Conversion is attributed to the high ion conductivity through aligned one-dimensional nanochannels and high ion selectivity via the size of the nanochannel at ~1 nm in the membrane. This study paves the way for designing covalent organic framework membranes for high salinity gradient Energy Conversion.
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charged porous asymmetric membrane for enhancing salinity gradient Energy Conversion
Nano Energy, 2021Co-Authors: Qianru Zhang, Shuhua Hou, Zhen ZhangAbstract:Abstract Salinity gradient Energy is an abundant renewable Energy source that can help satisfy the growing global demand for Energy. Although current approaches based on membrane design for salinity gradient Energy Conversion have been demonstrated to improve Conversion efficiency they suffer from the trade-off between selectivity and intrinsic resistance of the membranes, which impedes the rates of Energy Conversion. In this study, a charged porous asymmetric membrane was fabricated, consisting of a thin charged nanopore (~1 nm) layer and a charged porous structure (80–100 nm) layer. Its asymmetric electric potential and charged porous structure increase its affinity to uniport of ions and enables high ion conductivity. While maintaining a high degree of selectivity, the membrane exhibited an intrinsic membrane resistance of 0.53 ± 0.12 Ω·cm2, which was lower than that of the commercial and other reported membranes. The maximum power density reached up to 12.5 W/m2 with a 500-fold salinity gradient. This membrane shows great promise in industrialization and provides new insights into high salinity Energy Conversion.
Zhen Zhang - One of the best experts on this subject based on the ideXlab platform.
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nanofluidics for osmotic Energy Conversion
Nature Reviews Materials, 2021Co-Authors: Zhen Zhang, Liping Wen, Lei JiangAbstract:The osmotic pressure difference between river water and seawater is a promising source of renewable Energy. However, current osmotic Energy Conversion processes show limited power output, mainly owing to the low performance of commercial ion-exchange membranes. Nanofluidic channels with tailored ion transport dynamics enable high-performance reverse electrodialysis to efficiently harvest renewable osmotic Energy. In this Review, we discuss ion diffusion through nanofluidic channels and investigate the rational design and optimization of advanced membrane architectures. We highlight how the structure and charge distribution can be tailored to minimize resistance and promote Energy Conversion, and examine the possibility of integrating nanofluidic osmotic Energy Conversion with other technologies, such as desalination and water splitting. Finally, we give an outlook to future applications and discuss challenges that need to be overcome to enable large-scale, real-world applications. Osmotic Energy Conversion is a promising renewable Energy source. This Review discusses nanofluidics-based osmotic Energy Conversion systems, investigating the principles of ion diffusion in nanofluidic systems, optimization of membrane architectures to increase Energy Conversion and possible integration with other technologies, such as water splitting.
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charged porous asymmetric membrane for enhancing salinity gradient Energy Conversion
Nano Energy, 2021Co-Authors: Qianru Zhang, Shuhua Hou, Zhen ZhangAbstract:Abstract Salinity gradient Energy is an abundant renewable Energy source that can help satisfy the growing global demand for Energy. Although current approaches based on membrane design for salinity gradient Energy Conversion have been demonstrated to improve Conversion efficiency they suffer from the trade-off between selectivity and intrinsic resistance of the membranes, which impedes the rates of Energy Conversion. In this study, a charged porous asymmetric membrane was fabricated, consisting of a thin charged nanopore (~1 nm) layer and a charged porous structure (80–100 nm) layer. Its asymmetric electric potential and charged porous structure increase its affinity to uniport of ions and enables high ion conductivity. While maintaining a high degree of selectivity, the membrane exhibited an intrinsic membrane resistance of 0.53 ± 0.12 Ω·cm2, which was lower than that of the commercial and other reported membranes. The maximum power density reached up to 12.5 W/m2 with a 500-fold salinity gradient. This membrane shows great promise in industrialization and provides new insights into high salinity Energy Conversion.
Zhenhai Xia - One of the best experts on this subject based on the ideXlab platform.
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covalent organic framework electrocatalysts for clean Energy Conversion
Advanced Materials, 2018Co-Authors: Chunyu Lin, Detao Zhang, Zhenghang Zhao, Zhenhai XiaAbstract:Covalent organic frameworks (COFs) are promising for catalysis, sensing, gas storage, adsorption, optoelectricity, etc. owning to the unprecedented combination of large surface area, high crystallinity, tunable pore size, and unique molecular architecture. Although COFs are in their initial research stage, progress has been made in the design and synthesis of COF-based electrocatalysis for the oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, and CO2 reduction in Energy Conversion and fuel generation. Design principles are also established for some of the COF materials toward rational design and rapid screening of the best electrocatalysts for a specific application. Herein, the recent advances in the design and synthesis of COF-based catalysts for clean Energy Conversion and storage are presented. Future research directions and perspectives are also being discussed for the development of efficient COF-based electrocatalysts.
D Song - One of the best experts on this subject based on the ideXlab platform.
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phonon engineering in nanostructures for solid state Energy Conversion
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000Co-Authors: Gang Chen, T Zeng, Theodorian Borcatasciuc, D SongAbstract:Solid-state Energy Conversion technologies such as thermoelectric and thermionic refrigeration and power generation require materials with low thermal conductivity but good electrical conductivity, which are difficult to realize in bulk semiconductors. Nanostructures such as quantum wires and quantum wells provide alternative approaches to improve the solid-state Energy Conversion efficiency through size effects on the electron and phonon transport. In this paper, we discuss the possibility of engineering the phonon transport in nanostructures, with emphases on the thermal conductivity of superlattices. Following a general discussion on the directions for reducing the lattice thermal conductivity in nanostructures, specific modeling results on the phonon transport in superlattices will be presented and compared with recent experimental studies to illustrate the potential approaches and remaining questions.
Gang Chen - One of the best experts on this subject based on the ideXlab platform.
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heat transfer in nanostructures for solid state Energy Conversion
Journal of Heat Transfer-transactions of The Asme, 2002Co-Authors: Gang Chen, Ali ShakouriAbstract:Solid-state Energy Conversion technologies such as thermoelectric and thermionic refrigeration and power generation require materials with low thermal conductivity but good electrical conductivity and Seebeck coefficient, which are difficult to realize in bulk semi-conductors. Nanostructures such as superlattices, quantum wires, and quantum dots provide alternative approaches to improve the solid-state Energy Conversion efficiency through size and interface effects on the electron and phonon transport. In this review, we discuss recent research and progress using nanostructures for solid-state Energy converxion. The emphasis is placed on fundamental issues that distinguish Energy transport and Conversion between nanoscale and macroscale, as well as heat transfer issues related to device development and property characterization.
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phonon engineering in nanostructures for solid state Energy Conversion
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000Co-Authors: Gang Chen, T Zeng, Theodorian Borcatasciuc, D SongAbstract:Solid-state Energy Conversion technologies such as thermoelectric and thermionic refrigeration and power generation require materials with low thermal conductivity but good electrical conductivity, which are difficult to realize in bulk semiconductors. Nanostructures such as quantum wires and quantum wells provide alternative approaches to improve the solid-state Energy Conversion efficiency through size effects on the electron and phonon transport. In this paper, we discuss the possibility of engineering the phonon transport in nanostructures, with emphases on the thermal conductivity of superlattices. Following a general discussion on the directions for reducing the lattice thermal conductivity in nanostructures, specific modeling results on the phonon transport in superlattices will be presented and compared with recent experimental studies to illustrate the potential approaches and remaining questions.
