The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Feng Deng - One of the best experts on this subject based on the ideXlab platform.
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transfer channel of photoinduced holes on a tio2 surface as revealed by solid state nuclear magnetic resonance and electron spin resonance spectroscopy
Journal of the American Chemical Society, 2017Co-Authors: Ningdong Feng, Qiang Wang, Jun Xu, Guodong Qi, Chao Wang, Feng DengAbstract:The detailed structure–activity relationship of surface hydroxyl groups (Ti–OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their Spatial Proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti–OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close Spatial Proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti–OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in th...
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transfer channel of photoinduced holes on a tio2 surface as revealed by solid state nuclear magnetic resonance and electron spin resonance spectroscopy
Journal of the American Chemical Society, 2017Co-Authors: Fen Liu, Ningdong Feng, Qiang Wang, Chao Wang, Feng DengAbstract:The detailed structure-activity relationship of surface hydroxyl groups (Ti-OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their Spatial Proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti-OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close Spatial Proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti-OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in the h+ transfer process, in situ ESR experiments were performed on TiO2 with variable H2O loading, which revealed that the hydrated OHB groups offer a channel for the transfer of photogenerated holes in the photocatalytic reaction, and the adsorbed H2O could have a synergistic effect with the neighboring OHB group to facilitate the formation and evolution of active paramagnetic intermediates. On the basis of experimental observations, the detailed photocatalytic mechanism of water splitting on the surface of TiO2 was proposed.
Rishee K Jain - One of the best experts on this subject based on the ideXlab platform.
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context aware urban energy analytics cue a a framework to model relationships between building energy use and Spatial Proximity of urban systems
Sustainable Cities and Society, 2021Co-Authors: Ranjitha Shivaram, Zheng Yang, Rishee K JainAbstract:Abstract Cities account for over 75% of primary energy use in the world, with buildings making up a significant share of this energy use. Previous simulation-based research has established that building energy use can be greatly impacted by surrounding urban systems such as other buildings, vegetation, and roads. Understanding these relationships is thus critical to enhancing the efficiency of energy-intensive urban environments. Taking advantage of the recent profusion of urban data, this paper proposes a novel Context-aware Urban Energy Analytics (CUE-A) framework to empirically extract and quantify the relationships between building energy use and the Spatial Proximity of multiple surrounding urban systems. We apply the CUE-A framework to a case study of 477 buildings in a mid-size U.S. city to demonstrate its merits and the statistical significance of explored relationships. Results show that Spatial Proximity of other buildings, trees, and roads is associated with varied and significant changes in both the central tendency and variability of building energy use, indicating that empirical frameworks, which are a growing field of work, can serve as useful complements to existing simulation models. Further, our paper demonstrates that energy-aware urban planning and design has the potential to unlock energy efficiency and low-carbon pathways for cities around the world.
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context aware urban energy analytics cue a a framework to model relationships between building energy use and Spatial Proximity of urban systems
Sustainable Cities and Society, 2021Co-Authors: Ranjitha Shivaram, Zheng Yang, Rishee K JainAbstract:Abstract Cities account for over 75% of primary energy usage in the world, with buildings making up a significant share. Previous simulation-based research has established that building energy use can be greatly impacted by surrounding urban systems such as other buildings, vegetation and roads. Understanding these relationships is thus critical to enhancing the efficiency of energy-intensive urban environments. Taking advantage of the recent profusion of urban data, this paper proposes a novel Context-aware Urban Energy Analytics (CUE-A) framework to empirically extract and quantify the relationships between building energy use and the Spatial Proximity of multiple surrounding urban systems. We apply the CUE-A framework to a case study of 477 buildings in a mid-size U.S. city to demonstrate its merits and the statistical significance of explored relationships. Results show that Spatial Proximity of other buildings, roads, and trees is associated with varied and significant changes in both the central tendency and variability of building energy use, indicating that empirical frameworks, which are a growing field of work, can serve as useful complements to existing simulation models. Further, our paper demonstrates that energy-aware urban planning and design has the potential to unlock energy efficiency and low-carbon pathways for cities around the world.
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due a data driven urban energy analytics for understanding relationships between building energy use and urban systems
Energy Procedia, 2019Co-Authors: Zheng Yang, Karan Gupta, Rishee K JainAbstract:Abstract Cities account for over 75% of all primary energy usage in the world with buildings making up the bulk of this usage. It is well acknowledged that the building energy usage is greatly impacted by urban context and thus understanding the relationships between building energy use and surrounding urban systems is critical for more energy efficient and holistic planning. This paper proposes a Data-driven Urban Energy Analytics (DUE-A) workflow to investigate and quantify the relationships between building energy usage and the Spatial Proximity of other urban systems. A case study of 530 buildings in a mid-size city in the Unites States is conducted to validate the performance of the workflow and demonstrate the statistical significance of relationships between building energy use and Spatial Proximity of other systems. Results show that Spatial Proximity of other buildings, roads and trees can have both positive and negative impacts on the mean, variability and distribution of building energy usage, and indicate that more holistic planning and design of cities could unlock urban energy efficiency and low-carbon municipal pathways.
Ningdong Feng - One of the best experts on this subject based on the ideXlab platform.
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transfer channel of photoinduced holes on a tio2 surface as revealed by solid state nuclear magnetic resonance and electron spin resonance spectroscopy
Journal of the American Chemical Society, 2017Co-Authors: Ningdong Feng, Qiang Wang, Jun Xu, Guodong Qi, Chao Wang, Feng DengAbstract:The detailed structure–activity relationship of surface hydroxyl groups (Ti–OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their Spatial Proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti–OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close Spatial Proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti–OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in th...
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transfer channel of photoinduced holes on a tio2 surface as revealed by solid state nuclear magnetic resonance and electron spin resonance spectroscopy
Journal of the American Chemical Society, 2017Co-Authors: Fen Liu, Ningdong Feng, Qiang Wang, Chao Wang, Feng DengAbstract:The detailed structure-activity relationship of surface hydroxyl groups (Ti-OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their Spatial Proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti-OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close Spatial Proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti-OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in the h+ transfer process, in situ ESR experiments were performed on TiO2 with variable H2O loading, which revealed that the hydrated OHB groups offer a channel for the transfer of photogenerated holes in the photocatalytic reaction, and the adsorbed H2O could have a synergistic effect with the neighboring OHB group to facilitate the formation and evolution of active paramagnetic intermediates. On the basis of experimental observations, the detailed photocatalytic mechanism of water splitting on the surface of TiO2 was proposed.
Zheng Yang - One of the best experts on this subject based on the ideXlab platform.
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context aware urban energy analytics cue a a framework to model relationships between building energy use and Spatial Proximity of urban systems
Sustainable Cities and Society, 2021Co-Authors: Ranjitha Shivaram, Zheng Yang, Rishee K JainAbstract:Abstract Cities account for over 75% of primary energy use in the world, with buildings making up a significant share of this energy use. Previous simulation-based research has established that building energy use can be greatly impacted by surrounding urban systems such as other buildings, vegetation, and roads. Understanding these relationships is thus critical to enhancing the efficiency of energy-intensive urban environments. Taking advantage of the recent profusion of urban data, this paper proposes a novel Context-aware Urban Energy Analytics (CUE-A) framework to empirically extract and quantify the relationships between building energy use and the Spatial Proximity of multiple surrounding urban systems. We apply the CUE-A framework to a case study of 477 buildings in a mid-size U.S. city to demonstrate its merits and the statistical significance of explored relationships. Results show that Spatial Proximity of other buildings, trees, and roads is associated with varied and significant changes in both the central tendency and variability of building energy use, indicating that empirical frameworks, which are a growing field of work, can serve as useful complements to existing simulation models. Further, our paper demonstrates that energy-aware urban planning and design has the potential to unlock energy efficiency and low-carbon pathways for cities around the world.
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context aware urban energy analytics cue a a framework to model relationships between building energy use and Spatial Proximity of urban systems
Sustainable Cities and Society, 2021Co-Authors: Ranjitha Shivaram, Zheng Yang, Rishee K JainAbstract:Abstract Cities account for over 75% of primary energy usage in the world, with buildings making up a significant share. Previous simulation-based research has established that building energy use can be greatly impacted by surrounding urban systems such as other buildings, vegetation and roads. Understanding these relationships is thus critical to enhancing the efficiency of energy-intensive urban environments. Taking advantage of the recent profusion of urban data, this paper proposes a novel Context-aware Urban Energy Analytics (CUE-A) framework to empirically extract and quantify the relationships between building energy use and the Spatial Proximity of multiple surrounding urban systems. We apply the CUE-A framework to a case study of 477 buildings in a mid-size U.S. city to demonstrate its merits and the statistical significance of explored relationships. Results show that Spatial Proximity of other buildings, roads, and trees is associated with varied and significant changes in both the central tendency and variability of building energy use, indicating that empirical frameworks, which are a growing field of work, can serve as useful complements to existing simulation models. Further, our paper demonstrates that energy-aware urban planning and design has the potential to unlock energy efficiency and low-carbon pathways for cities around the world.
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due a data driven urban energy analytics for understanding relationships between building energy use and urban systems
Energy Procedia, 2019Co-Authors: Zheng Yang, Karan Gupta, Rishee K JainAbstract:Abstract Cities account for over 75% of all primary energy usage in the world with buildings making up the bulk of this usage. It is well acknowledged that the building energy usage is greatly impacted by urban context and thus understanding the relationships between building energy use and surrounding urban systems is critical for more energy efficient and holistic planning. This paper proposes a Data-driven Urban Energy Analytics (DUE-A) workflow to investigate and quantify the relationships between building energy usage and the Spatial Proximity of other urban systems. A case study of 530 buildings in a mid-size city in the Unites States is conducted to validate the performance of the workflow and demonstrate the statistical significance of relationships between building energy use and Spatial Proximity of other systems. Results show that Spatial Proximity of other buildings, roads and trees can have both positive and negative impacts on the mean, variability and distribution of building energy usage, and indicate that more holistic planning and design of cities could unlock urban energy efficiency and low-carbon municipal pathways.
Chao Wang - One of the best experts on this subject based on the ideXlab platform.
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transfer channel of photoinduced holes on a tio2 surface as revealed by solid state nuclear magnetic resonance and electron spin resonance spectroscopy
Journal of the American Chemical Society, 2017Co-Authors: Ningdong Feng, Qiang Wang, Jun Xu, Guodong Qi, Chao Wang, Feng DengAbstract:The detailed structure–activity relationship of surface hydroxyl groups (Ti–OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their Spatial Proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti–OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close Spatial Proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti–OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in th...
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transfer channel of photoinduced holes on a tio2 surface as revealed by solid state nuclear magnetic resonance and electron spin resonance spectroscopy
Journal of the American Chemical Society, 2017Co-Authors: Fen Liu, Ningdong Feng, Qiang Wang, Chao Wang, Feng DengAbstract:The detailed structure-activity relationship of surface hydroxyl groups (Ti-OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their Spatial Proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti-OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close Spatial Proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti-OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in the h+ transfer process, in situ ESR experiments were performed on TiO2 with variable H2O loading, which revealed that the hydrated OHB groups offer a channel for the transfer of photogenerated holes in the photocatalytic reaction, and the adsorbed H2O could have a synergistic effect with the neighboring OHB group to facilitate the formation and evolution of active paramagnetic intermediates. On the basis of experimental observations, the detailed photocatalytic mechanism of water splitting on the surface of TiO2 was proposed.
