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Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/05 , DOI: 10.1039/c9ee02616a Jaehyeong Bae 1, 2, 3, 4 , Tae Gwang Yun 1, 2, 3, 4 , Bong Lim Suh 2, 3, 4, 5 , Jihan Kim 2, 3, 4, 5 , Il-Doo Kim 1, 2, 3, 4
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/05 , DOI: 10.1039/c9ee02616a Jaehyeong Bae 1, 2, 3, 4 , Tae Gwang Yun 1, 2, 3, 4 , Bong Lim Suh 2, 3, 4, 5 , Jihan Kim 2, 3, 4, 5 , Il-Doo Kim 1, 2, 3, 4
Affiliation
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Autonomous energy scavenging from the ambient environment, or self-energy management, has attracted increasing attention because it could solve the energy problem of abundant Internet of things (IoT) devices. In recent years, several energy harvesters that generate electricity using water have been invented due to their simplicity, sustainability, and eco-friendliness. Until now, the devices have required periodic supplementation of water for continuous electricity generation, which hinders their practical use. Here, we built an artificial hydrological cycle in a transpiration-driven electrokinetic power generator (TEPG) to continuously and autonomously generate electric power. The TEPG, composed of carbon-coated cotton fabric, generates electricity by using a few drops of water (0.2 mL); the electric power originates from the potential difference in the asymmetrically wetted device and the pseudostreaming current. However, after only one hour, the TEPG stops generating electricity, as water inevitably evaporates from the device. For continuous self-operation, we utilized calcium chloride (CaCl2), a typical deliquescent chemical, to collect water vapor from the surrounding environment and continuously supply water to the TEPG. In the range of 15–60% relative humidity (RH), CaCl2 successfully compensates for the water loss by evaporation and maintains the electrical power generation in the closed system. In addition, CaCl2 enhances the generated voltage (0.74 V) and current (22.5 μA) by supplying additional Ca2+ ions to the carbon surface and reducing the resistance of the device, respectively. The developed self-operating transpiration-driven electrokinetic power generator (STEPG) is stable enough to light a light-emitting diode (LED) for a week and charge a commercialized supercapacitor (5 F) to 1.6 V for 8 days.
中文翻译：
具有人工水文循环的自发蒸腾驱动电动发电机
从周围环境中进行自主能源清除或自我能源管理已引起越来越多的关注，因为它可以解决丰富的物联网（IoT）设备的能源问题。近年来，由于其简单，可持续性和生态友好性，已经发明了几种利用水发电的能量收集器。迄今为止，该设备需要定期补充水以连续发电，这阻碍了它们的实际使用。在这里，我们在蒸腾驱动的电动发电机（TEPG）中建立了一个人工水文循环，以连续不断地自主发电。TEPG由碳纤维覆盖的棉织物组成，通过使用几滴水（0.2 mL）来发电。电力来自不对称润湿设备中的电势差和伪流电流。但是，仅一小时后，由于水不可避免地从设备中蒸发，因此TEPG停止发电。为了实现连续的自我操作，我们使用了氯化钙（CaCl2），一种典型的潮解性化学物质，用于收集周围环境中的水蒸气并持续向TEPG供应水。在15–60％的相对湿度（RH）范围内，CaCl 2成功地补偿了蒸发引起的水分流失，并保持了封闭系统中的发电量。另外，CaCl 2通过向碳表面分别供应额外的Ca 2+离子并降低器件的电阻，从而提高了产生的电压（0.74 V）和电流（22.5μA）。所开发的自驱动蒸腾驱动电动发电机（STEPG）足够稳定，可以点亮发光二极管（LED）一周，并可以将商用的超级电容器（5 F）充电至1.6 V，持续8天。
更新日期：2020-02-19
中文翻译：
具有人工水文循环的自发蒸腾驱动电动发电机
从周围环境中进行自主能源清除或自我能源管理已引起越来越多的关注，因为它可以解决丰富的物联网（IoT）设备的能源问题。近年来，由于其简单，可持续性和生态友好性，已经发明了几种利用水发电的能量收集器。迄今为止，该设备需要定期补充水以连续发电，这阻碍了它们的实际使用。在这里，我们在蒸腾驱动的电动发电机（TEPG）中建立了一个人工水文循环，以连续不断地自主发电。TEPG由碳纤维覆盖的棉织物组成，通过使用几滴水（0.2 mL）来发电。电力来自不对称润湿设备中的电势差和伪流电流。但是，仅一小时后，由于水不可避免地从设备中蒸发，因此TEPG停止发电。为了实现连续的自我操作，我们使用了氯化钙（CaCl2），一种典型的潮解性化学物质，用于收集周围环境中的水蒸气并持续向TEPG供应水。在15–60％的相对湿度（RH）范围内，CaCl 2成功地补偿了蒸发引起的水分流失，并保持了封闭系统中的发电量。另外，CaCl 2通过向碳表面分别供应额外的Ca 2+离子并降低器件的电阻，从而提高了产生的电压（0.74 V）和电流（22.5μA）。所开发的自驱动蒸腾驱动电动发电机（STEPG）足够稳定，可以点亮发光二极管（LED）一周，并可以将商用的超级电容器（5 F）充电至1.6 V，持续8天。
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