The Experts below are selected from a list of 47004 Experts worldwide ranked by ideXlab platform
Jianyun Zheng - One of the best experts on this subject based on the ideXlab platform.
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Defect engineering of the Protection Layer for photoelectrochemical devices
EnergyChem, 2020Co-Authors: Jianyun Zheng, Yanhong Lyu, Shuangyin WangAbstract:Abstract Photoelectrochemical (PEC) device integrated by solar absorber and catalyst is an economically viable solution for storing the solar energy into the fuel, synthesizing the chemical production, and purifying the environment. However, the degradation of semiconductor-based photoelectrodes during PEC reactions is one of the largest limitations for the application of PEC devices. Facing this challenge, the most prevailing strategy is to construct the Protection Layer on the surface of semiconductor for insulating the semiconductor from the electrolyte. The development of defect engineering in the Protection Layer is used to further addresses the issues from the introduction of new Layer, including light transmission, charge transfer, interfacial recombination and surface activity. This review aims to discuss recent advances in the defect engineering of Protection Layer for PEC devices. The types, characterization, role and utilization of the defects in the Protection Layer are discussed and summarized. Finally, the critical challenges and future perspective towards the development of the defect engineering of Protection Layer for PEC devices are analyzed.
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crystalline tio2 protective Layer with graded oxygen defects for efficient and stable silicon based photocathode
Nature Communications, 2018Co-Authors: Jianyun Zheng, Ruilun Wang, Huaijuan Zhou, San Ping Jiang, Shuangyin WangAbstract:The trade-offs between photoelectrode efficiency and stability significantly hinder the practical application of silicon-based photoelectrochemical devices. Here, we report a facile approach to decouple the trade-offs of silicon-based photocathodes by employing crystalline TiO2 with graded oxygen defects as Protection Layer. The crystalline Protection Layer provides high-density structure and enhances stability, and at the same time oxygen defects allow the carrier transport with low resistance as required for high efficiency. The silicon-based photocathode with black TiO2 shows a limiting current density of ~35.3 mA cm−2 and durability of over 100 h at 10 mA cm−2 in 1.0 M NaOH electrolyte, while none of photoelectrochemical behavior is observed in crystalline TiO2 Protection Layer. These findings have significant suggestions for further development of silicon-based, III–V compounds and other photoelectrodes and offer the possibility for achieving highly efficient and durable photoelectrochemical devices. While silicon-based materials can convert sunlight directly to fuel and electricity, balancing their stability and efficiency constrains usage. Here, authors protect silicon photocathodes with crystalline titanium dioxide Layers with graded oxygen defects to improve both durability and efficiency.
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defect enhanced charge separation and transfer within Protection Layer semiconductor structure of photoanodes
Advanced Materials, 2018Co-Authors: Jianyun Zheng, Yanhong Lyu, Chao Xie, Ruilun Wang, Li Tao, Huaijuan Zhou, San Ping Jiang, Shuangyin WangAbstract:Silicon (Si) requires a Protection Layer to maintain stable and long-time photoanodic reaction. However, poor charge separation and transfer are key constraint factors in Protection Layer/Si photoanodes that reduce their water-splitting efficiency. Here, a simultaneous enhancement of charge separation and transfer in Nb-doped NiOx /Ni/black-Si photoanodes induced by plasma treatment is reported. The optimized photoanodes yield the highest charge-separation efficiency (ηsep ) of ≈81% at 1.23 V versus reversible hydrogen electrode, corresponding to the photocurrent density of ≈29.1 mA cm-2 . On the basis of detailed characterizations, the concentration and species of oxygen defects in the NiOx -based Layer are adjusted by synergistic effect of Nb doping and plasma treatment, which are the dominating factors for forming suitable band structure and providing a favorable hole-migration channel. This work elucidates the important role of oxygen defects on charge separation and transfer in the Protection Layer/Si-based photoelectrochemical systems and is encouraging for application of this synergistic strategy to other candidate photoanodes.
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Defect-Enhanced Charge Separation and Transfer within Protection Layer/Semiconductor Structure of Photoanodes.
Advanced materials (Deerfield Beach Fla.), 2018Co-Authors: Jianyun Zheng, Yanhong Lyu, Chao Xie, Ruilun Wang, Li Tao, Huaijuan Zhou, San Ping Jiang, Shuangyin WangAbstract:Silicon (Si) requires a Protection Layer to maintain stable and long-time photoanodic reaction. However, poor charge separation and transfer are key constraint factors in Protection Layer/Si photoanodes that reduce their water-splitting efficiency. Here, a simultaneous enhancement of charge separation and transfer in Nb-doped NiOx /Ni/black-Si photoanodes induced by plasma treatment is reported. The optimized photoanodes yield the highest charge-separation efficiency (ηsep ) of ≈81% at 1.23 V versus reversible hydrogen electrode, corresponding to the photocurrent density of ≈29.1 mA cm-2 . On the basis of detailed characterizations, the concentration and species of oxygen defects in the NiOx -based Layer are adjusted by synergistic effect of Nb doping and plasma treatment, which are the dominating factors for forming suitable band structure and providing a favorable hole-migration channel. This work elucidates the important role of oxygen defects on charge separation and transfer in the Protection Layer/Si-based photoelectrochemical systems and is encouraging for application of this synergistic strategy to other candidate photoanodes.
Shuangyin Wang - One of the best experts on this subject based on the ideXlab platform.
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Defect engineering of the Protection Layer for photoelectrochemical devices
EnergyChem, 2020Co-Authors: Jianyun Zheng, Yanhong Lyu, Shuangyin WangAbstract:Abstract Photoelectrochemical (PEC) device integrated by solar absorber and catalyst is an economically viable solution for storing the solar energy into the fuel, synthesizing the chemical production, and purifying the environment. However, the degradation of semiconductor-based photoelectrodes during PEC reactions is one of the largest limitations for the application of PEC devices. Facing this challenge, the most prevailing strategy is to construct the Protection Layer on the surface of semiconductor for insulating the semiconductor from the electrolyte. The development of defect engineering in the Protection Layer is used to further addresses the issues from the introduction of new Layer, including light transmission, charge transfer, interfacial recombination and surface activity. This review aims to discuss recent advances in the defect engineering of Protection Layer for PEC devices. The types, characterization, role and utilization of the defects in the Protection Layer are discussed and summarized. Finally, the critical challenges and future perspective towards the development of the defect engineering of Protection Layer for PEC devices are analyzed.
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crystalline tio2 protective Layer with graded oxygen defects for efficient and stable silicon based photocathode
Nature Communications, 2018Co-Authors: Jianyun Zheng, Ruilun Wang, Huaijuan Zhou, San Ping Jiang, Shuangyin WangAbstract:The trade-offs between photoelectrode efficiency and stability significantly hinder the practical application of silicon-based photoelectrochemical devices. Here, we report a facile approach to decouple the trade-offs of silicon-based photocathodes by employing crystalline TiO2 with graded oxygen defects as Protection Layer. The crystalline Protection Layer provides high-density structure and enhances stability, and at the same time oxygen defects allow the carrier transport with low resistance as required for high efficiency. The silicon-based photocathode with black TiO2 shows a limiting current density of ~35.3 mA cm−2 and durability of over 100 h at 10 mA cm−2 in 1.0 M NaOH electrolyte, while none of photoelectrochemical behavior is observed in crystalline TiO2 Protection Layer. These findings have significant suggestions for further development of silicon-based, III–V compounds and other photoelectrodes and offer the possibility for achieving highly efficient and durable photoelectrochemical devices. While silicon-based materials can convert sunlight directly to fuel and electricity, balancing their stability and efficiency constrains usage. Here, authors protect silicon photocathodes with crystalline titanium dioxide Layers with graded oxygen defects to improve both durability and efficiency.
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defect enhanced charge separation and transfer within Protection Layer semiconductor structure of photoanodes
Advanced Materials, 2018Co-Authors: Jianyun Zheng, Yanhong Lyu, Chao Xie, Ruilun Wang, Li Tao, Huaijuan Zhou, San Ping Jiang, Shuangyin WangAbstract:Silicon (Si) requires a Protection Layer to maintain stable and long-time photoanodic reaction. However, poor charge separation and transfer are key constraint factors in Protection Layer/Si photoanodes that reduce their water-splitting efficiency. Here, a simultaneous enhancement of charge separation and transfer in Nb-doped NiOx /Ni/black-Si photoanodes induced by plasma treatment is reported. The optimized photoanodes yield the highest charge-separation efficiency (ηsep ) of ≈81% at 1.23 V versus reversible hydrogen electrode, corresponding to the photocurrent density of ≈29.1 mA cm-2 . On the basis of detailed characterizations, the concentration and species of oxygen defects in the NiOx -based Layer are adjusted by synergistic effect of Nb doping and plasma treatment, which are the dominating factors for forming suitable band structure and providing a favorable hole-migration channel. This work elucidates the important role of oxygen defects on charge separation and transfer in the Protection Layer/Si-based photoelectrochemical systems and is encouraging for application of this synergistic strategy to other candidate photoanodes.
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Defect-Enhanced Charge Separation and Transfer within Protection Layer/Semiconductor Structure of Photoanodes.
Advanced materials (Deerfield Beach Fla.), 2018Co-Authors: Jianyun Zheng, Yanhong Lyu, Chao Xie, Ruilun Wang, Li Tao, Huaijuan Zhou, San Ping Jiang, Shuangyin WangAbstract:Silicon (Si) requires a Protection Layer to maintain stable and long-time photoanodic reaction. However, poor charge separation and transfer are key constraint factors in Protection Layer/Si photoanodes that reduce their water-splitting efficiency. Here, a simultaneous enhancement of charge separation and transfer in Nb-doped NiOx /Ni/black-Si photoanodes induced by plasma treatment is reported. The optimized photoanodes yield the highest charge-separation efficiency (ηsep ) of ≈81% at 1.23 V versus reversible hydrogen electrode, corresponding to the photocurrent density of ≈29.1 mA cm-2 . On the basis of detailed characterizations, the concentration and species of oxygen defects in the NiOx -based Layer are adjusted by synergistic effect of Nb doping and plasma treatment, which are the dominating factors for forming suitable band structure and providing a favorable hole-migration channel. This work elucidates the important role of oxygen defects on charge separation and transfer in the Protection Layer/Si-based photoelectrochemical systems and is encouraging for application of this synergistic strategy to other candidate photoanodes.
Ming Zhu - One of the best experts on this subject based on the ideXlab platform.
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stable sodium metal anode enabled by an interface Protection Layer rich in organic sulfide salt
Nano Letters, 2020Co-Authors: Ming Zhu, Yuanjun Zhang, Zhongyi Huang, Ying Zhang, Guanyao Wang, Liaoyong Wen, Huakun Liu, S X DouAbstract:Sodium (Na) metal is considered as a promising anode candidate for large-scale energy storage systems because of its high theoretical capacity and low electrochemical redox potential. However, Na anode suffers from a few challenges, such as the dendrite growth and severe parasitic reactions with electrolytes, which greatly hinder its practical applications. In this work, we demonstrate that an organosulfur compound additive (tetramethylthiuram disulfide) provides a facile and promising approach to overcome the above challenges in carbonate-based electrolytes. This unique organosulfur additive can in situ form a stable interfacial Protection Layer rich in organic sulfide salts on the sodium metal surface during cycling, leading to a stable stripping/plating cycling. Additionally, a cycling Coulombic efficiency of 94.25% is achieved, and the full battery using Prussian Blue as a cathode delivers a reversible capacity of 86.2 mAh g-1 with a capacity retention of 80% after 600 cycles at 4 C.
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Dendrite-Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate-Rich Protection Layer.
Angewandte Chemie (International ed. in English), 2020Co-Authors: Ming Zhu, Zhongyi Huang, Guanyao Wang, Huakun Liu, Xing Liu, Bingkun Guo, Shi Xue DouAbstract:Sodium metal is an ideal anode material for metal rechargeable batteries, owing to its high theoretical capacity (1166 mAh g-1 ), low cost, and earth-abundance. However, the dendritic growth upon Na plating, stemming from unstable solid electrolyte interphase (SEI) film, is a major and most notable problem. Here, a sodium benzenedithiolate (PhS2 Na2 )-rich Protection Layer is synthesized in situ on sodium by a facile method that effectively prevents dendrite growth in the carbonate electrolyte, leading to stabilized sodium metal electrodeposition for 400 cycles (800 h) of repeated plating/stripping at a current density of 1 mA cm-2 . The organic salt, PhS2 Na2 , is found to be a critical component in the Protection Layer. This finding opens up a new and promising avenue, based on organic sodium slats, to stabilize sodium metals with a Protection Layer.
Shi Xue Dou - One of the best experts on this subject based on the ideXlab platform.
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Dendrite-Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate-Rich Protection Layer.
Angewandte Chemie (International ed. in English), 2020Co-Authors: Ming Zhu, Zhongyi Huang, Guanyao Wang, Huakun Liu, Xing Liu, Bingkun Guo, Shi Xue DouAbstract:Sodium metal is an ideal anode material for metal rechargeable batteries, owing to its high theoretical capacity (1166 mAh g-1 ), low cost, and earth-abundance. However, the dendritic growth upon Na plating, stemming from unstable solid electrolyte interphase (SEI) film, is a major and most notable problem. Here, a sodium benzenedithiolate (PhS2 Na2 )-rich Protection Layer is synthesized in situ on sodium by a facile method that effectively prevents dendrite growth in the carbonate electrolyte, leading to stabilized sodium metal electrodeposition for 400 cycles (800 h) of repeated plating/stripping at a current density of 1 mA cm-2 . The organic salt, PhS2 Na2 , is found to be a critical component in the Protection Layer. This finding opens up a new and promising avenue, based on organic sodium slats, to stabilize sodium metals with a Protection Layer.
Guanyao Wang - One of the best experts on this subject based on the ideXlab platform.
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stable sodium metal anode enabled by an interface Protection Layer rich in organic sulfide salt
Nano Letters, 2020Co-Authors: Ming Zhu, Yuanjun Zhang, Zhongyi Huang, Ying Zhang, Guanyao Wang, Liaoyong Wen, Huakun Liu, S X DouAbstract:Sodium (Na) metal is considered as a promising anode candidate for large-scale energy storage systems because of its high theoretical capacity and low electrochemical redox potential. However, Na anode suffers from a few challenges, such as the dendrite growth and severe parasitic reactions with electrolytes, which greatly hinder its practical applications. In this work, we demonstrate that an organosulfur compound additive (tetramethylthiuram disulfide) provides a facile and promising approach to overcome the above challenges in carbonate-based electrolytes. This unique organosulfur additive can in situ form a stable interfacial Protection Layer rich in organic sulfide salts on the sodium metal surface during cycling, leading to a stable stripping/plating cycling. Additionally, a cycling Coulombic efficiency of 94.25% is achieved, and the full battery using Prussian Blue as a cathode delivers a reversible capacity of 86.2 mAh g-1 with a capacity retention of 80% after 600 cycles at 4 C.
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Dendrite-Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate-Rich Protection Layer.
Angewandte Chemie (International ed. in English), 2020Co-Authors: Ming Zhu, Zhongyi Huang, Guanyao Wang, Huakun Liu, Xing Liu, Bingkun Guo, Shi Xue DouAbstract:Sodium metal is an ideal anode material for metal rechargeable batteries, owing to its high theoretical capacity (1166 mAh g-1 ), low cost, and earth-abundance. However, the dendritic growth upon Na plating, stemming from unstable solid electrolyte interphase (SEI) film, is a major and most notable problem. Here, a sodium benzenedithiolate (PhS2 Na2 )-rich Protection Layer is synthesized in situ on sodium by a facile method that effectively prevents dendrite growth in the carbonate electrolyte, leading to stabilized sodium metal electrodeposition for 400 cycles (800 h) of repeated plating/stripping at a current density of 1 mA cm-2 . The organic salt, PhS2 Na2 , is found to be a critical component in the Protection Layer. This finding opens up a new and promising avenue, based on organic sodium slats, to stabilize sodium metals with a Protection Layer.
