Simultaneous electricity generation and steam production from a wide range of salinity by using unique nanofluidic diode

Jiang, Zhongbao; Yang, Tingting; Lu, Xulei; Fu, Chunqiao; Zhang, Yong; Shang, Kedong; Zhou, Jian; He, Changliu; Zhu, Ping; He, Qi‐Chang

doi:10.1016/j.nanoen.2023.108220

Cited by 15 publications

(7 citation statements)

References 37 publications

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“…The lower electrode is made of eutectic gallium‐indium (EGaIn), which exhibits excellent conductivity, hydrophilicity, and activity, while its liquid property allows it to combine well with AAO. The main difference from previous work is that an appropriate amount of calcium chloride solution [ 22c ] was deposited by spin coating on the lower surface of AAO far away from the PN junction region (Figure S4, Supporting Information). The distribution of the corresponding ions in the channel is shown in Figure S5, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

“…The third model of moisture‐based power generation, typically underlying the nanofluidic diode device, is inspired by the photovoltaic effect. [ 22 ] A PN junction is formed by contacting a negatively charged nanofluidic channel with a positively charged nanopore. When moisture is adsorbed on the upper surface of the nanochannel, liquid water is formed due to the capillary coalescence effect, and heat energy is released.…”

Section: Introductionmentioning

confidence: 99%

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A Long Life Moisture‐Enabled Electric Generator Based on Ionic Diode Rectification and Electrode Chemistry Regulation

Fu,

Zhou,

et al. 2024

Advanced Science

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Considerable efforts have recently been made to augment the power density of moisture‐enabled electric generators. However, due to the unsustainable ion/water molecule concentration gradients, the ion‐directed transport gradually diminishes, which largely affects the operating lifetime and energy efficiency of generators. This work introduces an electrode chemistry regulation strategy into the ionic diode‐type energy conversion structure, which demonstrates 1240 h power generation in ambient humidity. The electrode chemical regulation can be achieved by adding Cl−. The purpose is to destroy the passivation film on the electrode interface and provide a continuous path for ion‐electron coupling conduction. Moreover, this device simultaneously satisfies the requirements of fast trapping of moisture molecules, high rectification ratio transport of ions, and sustained ion‐to‐electron current conversion. A single device can deliver an open‐circuit voltage of about 1 V and a peak short‐circuit current density of 350 µA cm−2. Finally, the first‐principle calculations are carried out to reveal the mechanism by which the electrode surface chemistry affects the power generation performance.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Long Life Moisture‐Enabled Electric Generator Based on Ionic Diode Rectification and Electrode Chemistry Regulation

Fu,

Zhou,

et al. 2024

Advanced Science

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“…However, an excessive ion concentration can eventually weaken the screening effect of EDLs, resulting in an inability to effectively form the streaming potential induced by capillary infiltration. [14,40] This failure of the EDL screening effect is mainly reflected in the rate of degradation of the current. Methanol dissociation was very low; therefore, the current decayed more slowly.…”

Section: Influencing Factorsmentioning

confidence: 99%

Ion‐Diode‐Like Heterojunction for Improving Electricity Generation from Water Droplets by Capillary Infiltration

Wang

et al. 2023

Advanced Materials

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Water‐droplet‐based electricity generators are emerging hydrovoltaic technologies that harvest energy from water circulation through strong interactions between water and nanomaterials. However, such devices exhibit poor current performance owing to their unclear driving force (evaporation or infiltration) and undesirable reverse diffusion current. Herein, a water‐droplet‐based hydrovoltaic electricity generator induced by capillary infiltration with an asymmetric structure composed of a diode‐like heterojunction formed by negatively and positively charged materials is fabricated. This device can generate current densities of 160 and 450 µA cm−2 at room temperature and 65 °C, respectively. The heterojunction achieves a rectification ratio of 12, which effectively suppresses the reverse current caused by concentration differences. This results in an improved charge accumulation of ≈60 mC cm−2 in 1000 s, which is three times the value observed in the control device. When the area of the device is increased to 6 cm2, the current increases linearly to 1 mA, thus demonstrating the scale‐up potential of the generator. It has been proven that the streaming potential originates from capillary infiltration, and the presence of ion rectification. The proposed method of constructing ion‐diode‐like structures provides a new strategy for improving generator performance.

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“…However, the addition of salt ions tends to cause the Debye length to be much smaller than the minimum cross-sectional size in the nanopore channel, resulting in poor ion-selective transport capability and weakening the power generation performance of the devices. [30][31][32][33] For example, the rectification ratio of the sandwich-structured nanofluidic diode 5 device reaches a maximum value of 16.5 at an ion concentration of 10 À3 M. When the ion concentration is 1 M, the rectification ratio decreases to about 3. How to ingeniously combine ionic hydrogels with ionic diode structures to achieve high output power and excellent antifreeze performance is still full of unknowns and challenges, and breakthroughs in customized physicochemical properties and structural design strategies are urgently needed.…”

Section: Introductionmentioning

confidence: 99%

Efficient and cold-tolerant moisture-enabled power generator combining ionic diode and ionic hydrogel

Fang,

Zhang,

Duan

et al. 2024

Mater. Horiz.

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Simultaneous electricity generation and steam production from a wide range of salinity by using unique nanofluidic diode

Cited by 15 publications

References 37 publications

A Long Life Moisture‐Enabled Electric Generator Based on Ionic Diode Rectification and Electrode Chemistry Regulation

A Long Life Moisture‐Enabled Electric Generator Based on Ionic Diode Rectification and Electrode Chemistry Regulation

Ion‐Diode‐Like Heterojunction for Improving Electricity Generation from Water Droplets by Capillary Infiltration

Efficient and cold-tolerant moisture-enabled power generator combining ionic diode and ionic hydrogel

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