A One‐Dimensional Fluidic Nanogenerator with a High Power Conversion Efficiency

Abstract

Electricity generation from flowing water has been developed for over ac entury and playsac ritical role in our lives.G enerally,h eavy and complex facilities are required for electricity generation, while using these technologies for applications that require as mall sizea nd high flexibility is difficult. Here,w ed eveloped af luidic nanogenerator fiber from an aligned carbon nanotube sheet to generate electricity from any flowing water source in the environment as well as in the human body.T he power conversion efficiency reached 23.3 %. The fluidic nanogenerator fiber was flexible and stretchable,a nd the high performance was well-maintained after deformation over 1000 000 cycles.T he fiber also offered unique and promising advantages,s uch as the ability to be woven into fabrics for large-scale applications.

The Emerging of Hydrovoltaic Materials as a Future Technology: A Case Study for China

“…In 2007, Liu and Dai reported that the flow-induced voltage can be greatly improved by aligning the nanotubes along the flow direction [23]. In 2017, Xu et al fabricated a fluidic nanogenerator fiber with the aligned multiwalled carbon nanotube sheet (inset of Figure 6b) [22]. The device shows a power conversion efficiency of 23.3% and an excellent stability over 1,000,000 cycles.…”

“…In this setup, the moving graphene is served as driving force for ion movement, while another graphene is as a reference electrode. (a) Voltage curve induced by a saturated NaCl flow at the velocity of 1.2 cm/s [22]. (b) Relationship between the voltage and the flow velocity.…”

“…(b) Relationship between the voltage and the flow velocity. Solution is 0.6 M NaCl [22]. (c) The voltage vs. current relationship as the concentration variation of NaCl solution ( flow velocity: 12.9 cm/s) [22].…”

“…Solution is 0.6 M NaCl [22]. (c) The voltage vs. current relationship as the concentration variation of NaCl solution ( flow velocity: 12.9 cm/s) [22]. (d) Dependence of the voltage on the OMC content in a saturated NaCl solution ( flowing velocity: 20 cm/s) [22].…”

Interactions between Graphene‐Based Materials and Water Molecules toward Actuator and Electricity‐Generator Applications

“…Among these applications, fabricated devices based on the interactions between water molecules with graphene and/or its derivatives are of considerable interest as the energy and environmental crisis grow worse in the modern world. For example, these interactions can induce the conversion of chemical energy to electric and/or mechanical energy, which is potentially profitable for various applications such as sensors, actuators, robots, switches, artificial muscles, and electricity generators . Benefiting from the large available surface area, the unique electrical, thermal, and mechanical properties of graphene and/or its derivatives, as well as the ease of structure functionalization, device‐oriented applications based on the interactions between graphene materials and water molecules have become of increasing concern .…”