The Experts below are selected from a list of 1494 Experts worldwide ranked by ideXlab platform

Solly Motaung - One of the best experts on this subject based on the ideXlab platform.

  • Sulphate removal from sodium sulphate-rich brine and recovery of Barium as a Barium Salt mixture.
    Journal of Environmental Science and Health Part A-toxic\ hazardous Substances & Environmental Engineering, 2013
    Co-Authors: Viswanath R.k. Vadapalli, J. N. Zvimba, Jean Mulopo, Solly Motaung
    Abstract:

    Sulphate removal from sodium sulphate-rich brine using Barium hydroxide and recovery of the Barium Salts has been investigated. The sodium sulphate-rich brine treated with different dosages of Barium hydroxide to precipitate Barium sulphate showed sulphate removal from 13.5 g/L to less than 400 mg/L over 60 min using a Barium to sulphate molar ratio of 1.1. The thermal conversion of precipitated Barium sulphate to Barium sulphide achieved a conversion yield of 85% using coal as both a reducing agent and an energy source. The recovery of a pure mixture of Barium Salts from Barium sulphide, which involved dissolution of Barium sulphide and reaction with ammonium hydroxide resulted in recovery of a mixture of Barium carbonate (62%) and Barium hydroxide (38%), which is a critical input raw material for Barium Salts based acid mine drainage (AMD) desalination technologies. Under alkaline conditions of this Barium Salt mixture recovery process, ammonia gas is given off, while hydrogen sulfide is retained in sol...

  • Sulphate removal from sodium sulphate-rich brine and recovery of Barium as a Barium Salt mixture.
    Journal of environmental science and health. Part A Toxic hazardous substances & environmental engineering, 2013
    Co-Authors: Viswanath R.k. Vadapalli, J. N. Zvimba, Jean Mulopo, Solly Motaung
    Abstract:

    Sulphate removal from sodium sulphate-rich brine using Barium hydroxide and recovery of the Barium Salts has been investigated. The sodium sulphate-rich brine treated with different dosages of Barium hydroxide to precipitate Barium sulphate showed sulphate removal from 13.5 g/L to less than 400 mg/L over 60 min using a Barium to sulphate molar ratio of 1.1. The thermal conversion of precipitated Barium sulphate to Barium sulphide achieved a conversion yield of 85% using coal as both a reducing agent and an energy source. The recovery of a pure mixture of Barium Salts from Barium sulphide, which involved dissolution of Barium sulphide and reaction with ammonium hydroxide resulted in recovery of a mixture of Barium carbonate (62%) and Barium hydroxide (38%), which is a critical input raw material for Barium Salts based acid mine drainage (AMD) desalination technologies. Under alkaline conditions of this Barium Salt mixture recovery process, ammonia gas is given off, while hydrogen sulfide is retained in solution as bisulfide species, and this provides basis for ammonium hydroxide separation and recovery for reuse, with hydrogen sulfide also recoverable for further industrial applications such as sulfur production by subsequent stripping.

Mao Yanli - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Performance of Perovskite Solar Cells by Using Ultrathin BaTiO3 Interface Modification
    ACS applied materials & interfaces, 2018
    Co-Authors: Jianqiang Qin, Zhenlong Zhang, Wenjia Shi, Yuefeng Liu, Hui-ping Gao, Mao Yanli
    Abstract:

    Efficiency promotion has been severely constrained by charge recombination in perovskite solar cells (PSCs). Interface modification has been proved to be an effective way to reduce the interfacial charge recombination. In this work, a mesoporous TiO2 (mp-TiO2) layer was modified by an ultrathin BaTiO3 layer to suppress charge recombination in PSCs. The ultrathin BaTiO3 modification layer was prepared by the spin coating method using a Barium Salt solution. The concentration of the Barium Salt solution was optimized, and the effect of the BaTiO3 modification layer on the performance of the cells was also investigated. The modification layer can not only successfully retard charge recombination but also effectively boost the rate of electron extraction at the interface, resulting in enhanced open-circuit voltage (Voc), short circuit current density (Jsc), and fill factor. Furthermore, the hysteresis of the PSCs was also significantly reduced after the modification. By optimizing and employing the BaTiO3 mod...

Jianqiang Qin - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Performance of Perovskite Solar Cells by Using Ultrathin BaTiO3 Interface Modification
    ACS applied materials & interfaces, 2018
    Co-Authors: Jianqiang Qin, Zhenlong Zhang, Wenjia Shi, Yuefeng Liu, Hui-ping Gao, Mao Yanli
    Abstract:

    Efficiency promotion has been severely constrained by charge recombination in perovskite solar cells (PSCs). Interface modification has been proved to be an effective way to reduce the interfacial charge recombination. In this work, a mesoporous TiO2 (mp-TiO2) layer was modified by an ultrathin BaTiO3 layer to suppress charge recombination in PSCs. The ultrathin BaTiO3 modification layer was prepared by the spin coating method using a Barium Salt solution. The concentration of the Barium Salt solution was optimized, and the effect of the BaTiO3 modification layer on the performance of the cells was also investigated. The modification layer can not only successfully retard charge recombination but also effectively boost the rate of electron extraction at the interface, resulting in enhanced open-circuit voltage (Voc), short circuit current density (Jsc), and fill factor. Furthermore, the hysteresis of the PSCs was also significantly reduced after the modification. By optimizing and employing the BaTiO3 mod...

  • Enhanced Performance of Perovskite Solar Cells by Using Ultrathin BaTiO3 Interface Modification
    2018
    Co-Authors: Jianqiang Qin, Zhenlong Zhang, Wenjia Shi, Yuefeng Liu, Hui-ping Gao, Yanli Mao
    Abstract:

    Efficiency promotion has been severely constrained by charge recombination in perovskite solar cells (PSCs). Interface modification has been proved to be an effective way to reduce the interfacial charge recombination. In this work, a mesoporous TiO2 (mp-TiO2) layer was modified by an ultrathin BaTiO3 layer to suppress charge recombination in PSCs. The ultrathin BaTiO3 modification layer was prepared by the spin coating method using a Barium Salt solution. The concentration of the Barium Salt solution was optimized, and the effect of the BaTiO3 modification layer on the performance of the cells was also investigated. The modification layer can not only successfully retard charge recombination but also effectively boost the rate of electron extraction at the interface, resulting in enhanced open-circuit voltage (Voc), short circuit current density (Jsc), and fill factor. Furthermore, the hysteresis of the PSCs was also significantly reduced after the modification. By optimizing and employing the BaTiO3 modification layer, the power conversion efficiency of the cells was increased from 16.13 to 17.87%

Viswanath R.k. Vadapalli - One of the best experts on this subject based on the ideXlab platform.

  • Sulphate removal from sodium sulphate-rich brine and recovery of Barium as a Barium Salt mixture.
    Journal of Environmental Science and Health Part A-toxic\ hazardous Substances & Environmental Engineering, 2013
    Co-Authors: Viswanath R.k. Vadapalli, J. N. Zvimba, Jean Mulopo, Solly Motaung
    Abstract:

    Sulphate removal from sodium sulphate-rich brine using Barium hydroxide and recovery of the Barium Salts has been investigated. The sodium sulphate-rich brine treated with different dosages of Barium hydroxide to precipitate Barium sulphate showed sulphate removal from 13.5 g/L to less than 400 mg/L over 60 min using a Barium to sulphate molar ratio of 1.1. The thermal conversion of precipitated Barium sulphate to Barium sulphide achieved a conversion yield of 85% using coal as both a reducing agent and an energy source. The recovery of a pure mixture of Barium Salts from Barium sulphide, which involved dissolution of Barium sulphide and reaction with ammonium hydroxide resulted in recovery of a mixture of Barium carbonate (62%) and Barium hydroxide (38%), which is a critical input raw material for Barium Salts based acid mine drainage (AMD) desalination technologies. Under alkaline conditions of this Barium Salt mixture recovery process, ammonia gas is given off, while hydrogen sulfide is retained in sol...

  • Sulphate removal from sodium sulphate-rich brine and recovery of Barium as a Barium Salt mixture.
    Journal of environmental science and health. Part A Toxic hazardous substances & environmental engineering, 2013
    Co-Authors: Viswanath R.k. Vadapalli, J. N. Zvimba, Jean Mulopo, Solly Motaung
    Abstract:

    Sulphate removal from sodium sulphate-rich brine using Barium hydroxide and recovery of the Barium Salts has been investigated. The sodium sulphate-rich brine treated with different dosages of Barium hydroxide to precipitate Barium sulphate showed sulphate removal from 13.5 g/L to less than 400 mg/L over 60 min using a Barium to sulphate molar ratio of 1.1. The thermal conversion of precipitated Barium sulphate to Barium sulphide achieved a conversion yield of 85% using coal as both a reducing agent and an energy source. The recovery of a pure mixture of Barium Salts from Barium sulphide, which involved dissolution of Barium sulphide and reaction with ammonium hydroxide resulted in recovery of a mixture of Barium carbonate (62%) and Barium hydroxide (38%), which is a critical input raw material for Barium Salts based acid mine drainage (AMD) desalination technologies. Under alkaline conditions of this Barium Salt mixture recovery process, ammonia gas is given off, while hydrogen sulfide is retained in solution as bisulfide species, and this provides basis for ammonium hydroxide separation and recovery for reuse, with hydrogen sulfide also recoverable for further industrial applications such as sulfur production by subsequent stripping.

Wenjia Shi - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Performance of Perovskite Solar Cells by Using Ultrathin BaTiO3 Interface Modification
    ACS applied materials & interfaces, 2018
    Co-Authors: Jianqiang Qin, Zhenlong Zhang, Wenjia Shi, Yuefeng Liu, Hui-ping Gao, Mao Yanli
    Abstract:

    Efficiency promotion has been severely constrained by charge recombination in perovskite solar cells (PSCs). Interface modification has been proved to be an effective way to reduce the interfacial charge recombination. In this work, a mesoporous TiO2 (mp-TiO2) layer was modified by an ultrathin BaTiO3 layer to suppress charge recombination in PSCs. The ultrathin BaTiO3 modification layer was prepared by the spin coating method using a Barium Salt solution. The concentration of the Barium Salt solution was optimized, and the effect of the BaTiO3 modification layer on the performance of the cells was also investigated. The modification layer can not only successfully retard charge recombination but also effectively boost the rate of electron extraction at the interface, resulting in enhanced open-circuit voltage (Voc), short circuit current density (Jsc), and fill factor. Furthermore, the hysteresis of the PSCs was also significantly reduced after the modification. By optimizing and employing the BaTiO3 mod...

  • Enhanced Performance of Perovskite Solar Cells by Using Ultrathin BaTiO3 Interface Modification
    2018
    Co-Authors: Jianqiang Qin, Zhenlong Zhang, Wenjia Shi, Yuefeng Liu, Hui-ping Gao, Yanli Mao
    Abstract:

    Efficiency promotion has been severely constrained by charge recombination in perovskite solar cells (PSCs). Interface modification has been proved to be an effective way to reduce the interfacial charge recombination. In this work, a mesoporous TiO2 (mp-TiO2) layer was modified by an ultrathin BaTiO3 layer to suppress charge recombination in PSCs. The ultrathin BaTiO3 modification layer was prepared by the spin coating method using a Barium Salt solution. The concentration of the Barium Salt solution was optimized, and the effect of the BaTiO3 modification layer on the performance of the cells was also investigated. The modification layer can not only successfully retard charge recombination but also effectively boost the rate of electron extraction at the interface, resulting in enhanced open-circuit voltage (Voc), short circuit current density (Jsc), and fill factor. Furthermore, the hysteresis of the PSCs was also significantly reduced after the modification. By optimizing and employing the BaTiO3 modification layer, the power conversion efficiency of the cells was increased from 16.13 to 17.87%