The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectru...The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectrum response and poor mass transfer.Hence, in this study, a microfluidic all-vanadium photoelectrochemical cell with a full-spectrum-responsive Ti2O3 photoanode was proposed for efficient solar energy storage. Experimental results indicated that the Ti2O3 photoanode responded to almost the full spectrum of sunlight and exhibited excellent photoresponse and operation stability, which facilitated efficient solar energy utilization. Additionally, the effects of the light intensity, vanadium ion concentration, and electrolyte flow rate were studied. It was found that increasing the light intensity and vanadium ion concentration and reducing the electrolyte flow rate promoted photoelectrochemical reactions and thus improved the solar energy storage performance. The obtained results demonstrate the feasibility and superiority of using Ti2O3 as the photoanode for a photoelectrochemical cell to achieve efficient solar energy storage.展开更多
为提升钒电池负极侧电极的电化学活性,采用液相氧化法对碳纳米管进行改性,并将其引入石墨毡表面制备复合电极。首先对碳纳米管与石墨毡的电化学性能进行对比,再通过液相氧化改性对碳纳米管的电化学活性进一步优化,最后制备了碳纳米管石...为提升钒电池负极侧电极的电化学活性,采用液相氧化法对碳纳米管进行改性,并将其引入石墨毡表面制备复合电极。首先对碳纳米管与石墨毡的电化学性能进行对比,再通过液相氧化改性对碳纳米管的电化学活性进一步优化,最后制备了碳纳米管石墨毡复合电极,并采用充放电测试考察其性能表现。结果表明:在浓H_(2)SO_(4)与浓HNO_(3)体积比为1∶3,温度80℃,改性时间2 h条件下得到的碳纳米管电化学活性最佳。在120 mA cm 2的电流密度下,以复合电极为负极的电池电压效率和能量效率分别为87.96%、83.47%,分别比石墨毡(82.08%、77.31%)提高了5.88和6.16个百分点,具有良好的倍率性能。展开更多
以大规模全钒液流电池作为风电场的储能装置,提出了基于模糊自适应卡尔曼滤波的储能系统控制策略。控制策略以电池荷电状态(state of charge,SOC)和SOC变化率调整储能系统有功功率目标值,有效地解决了低通滤波相位延迟的问题,加快了电池...以大规模全钒液流电池作为风电场的储能装置,提出了基于模糊自适应卡尔曼滤波的储能系统控制策略。控制策略以电池荷电状态(state of charge,SOC)和SOC变化率调整储能系统有功功率目标值,有效地解决了低通滤波相位延迟的问题,加快了电池的SOC恢复速度。仿真结果表明,采用上述控制策略后,风电场输出功率波动得到抑制,电池的SOC也得到有效控制,这防止了电池的过充过放,延长了储能系统的寿命。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.51576021,51620105011,51776026)the Program for Backup Talent Development of Chongqing University(Grant No.CQU2017HBRC1A01)the Fundamental Research Funds for the Central Universities(Grant No.2018CDXYDL0001)
文摘The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectrum response and poor mass transfer.Hence, in this study, a microfluidic all-vanadium photoelectrochemical cell with a full-spectrum-responsive Ti2O3 photoanode was proposed for efficient solar energy storage. Experimental results indicated that the Ti2O3 photoanode responded to almost the full spectrum of sunlight and exhibited excellent photoresponse and operation stability, which facilitated efficient solar energy utilization. Additionally, the effects of the light intensity, vanadium ion concentration, and electrolyte flow rate were studied. It was found that increasing the light intensity and vanadium ion concentration and reducing the electrolyte flow rate promoted photoelectrochemical reactions and thus improved the solar energy storage performance. The obtained results demonstrate the feasibility and superiority of using Ti2O3 as the photoanode for a photoelectrochemical cell to achieve efficient solar energy storage.
文摘为提升钒电池负极侧电极的电化学活性,采用液相氧化法对碳纳米管进行改性,并将其引入石墨毡表面制备复合电极。首先对碳纳米管与石墨毡的电化学性能进行对比,再通过液相氧化改性对碳纳米管的电化学活性进一步优化,最后制备了碳纳米管石墨毡复合电极,并采用充放电测试考察其性能表现。结果表明:在浓H_(2)SO_(4)与浓HNO_(3)体积比为1∶3,温度80℃,改性时间2 h条件下得到的碳纳米管电化学活性最佳。在120 mA cm 2的电流密度下,以复合电极为负极的电池电压效率和能量效率分别为87.96%、83.47%,分别比石墨毡(82.08%、77.31%)提高了5.88和6.16个百分点,具有良好的倍率性能。
文摘以大规模全钒液流电池作为风电场的储能装置,提出了基于模糊自适应卡尔曼滤波的储能系统控制策略。控制策略以电池荷电状态(state of charge,SOC)和SOC变化率调整储能系统有功功率目标值,有效地解决了低通滤波相位延迟的问题,加快了电池的SOC恢复速度。仿真结果表明,采用上述控制策略后,风电场输出功率波动得到抑制,电池的SOC也得到有效控制,这防止了电池的过充过放,延长了储能系统的寿命。
