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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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This Device Produces Electricity From Simple Clapping & Help Do Exercises More Safely. Heres How

As the global population continues to grow, two challenges are becoming increasingly important: finding sustainable sources of energy and improving human health. Researchers are now exploring technologies that can address both problems at the same time.

One promising approach comes from triboelectric nanogenerators (TENGs)—small devices that can convert everyday mechanical movements into electrical energy. In a recent study, Yupeng Mao and his team developed a flexible, lightweight system that not only harvests energy from human movement but also uses that energy to monitor exercise and identify incorrect movement techniques.

The result is a self-powered wireless motion correction system that could potentially make wearable health-monitoring technology more convenient, sustainable, and intelligent.

Turning Human Movement Into Electricity

Everyday activities such as walking, bending, stretching, clapping, and exercising involve mechanical energy. Most of this energy is simply lost to the environment.

TENG technology provides a way to capture some of that otherwise wasted energy.

Triboelectric nanogenerators work through the interaction of triboelectric charging and electrostatic induction. When two different materials come into contact and then separate, electrical charges are generated. With an appropriate design, this electrical energy can be collected and used to power small electronic devices.

Since TENGs were introduced in 2012, researchers have investigated their use for harvesting energy from sources such as wind, water waves, vibrations, and human motion.

Their advantages make them particularly attractive for wearable technology. TENGs can be lightweight, flexible, relatively inexpensive, and manufactured using a wide range of materials.

The latest research takes this concept a step further by combining energy harvesting with intelligent motion monitoring.

A Flexible Sensor That Works With the Body

Mao and his team developed a flexible triboelectric nanogenerator called FL-TENG.

The device uses several layers, each serving a specific purpose. Transparent polytetrafluoroethylene (PTFE) and polyurethane (PU) films act as the friction layers, while polydimethylsiloxane (PDMS) provides structural support. A flexible hydrogel is used as the electrode.

This combination allows the device to remain lightweight and flexible enough to be attached directly to the human body.

When a person moves, the FL-TENG bends, stretches, or undergoes repeated contact and separation. These mechanical changes generate electrical signals.

Importantly, those signals have two functions.

First, they provide electrical energy that can help power small electronic components. Second, they contain information about the person's movement.

That means the same device can act as both an energy harvester and a motion sensor.

From Exercise to Digital Data

The researchers connected the FL-TENG to a wireless intelligent host computer system.

As a person performs an exercise, the sensor detects changes in movement, including parameters such as bending angle and movement frequency. These electrical signals are then transmitted wirelessly for processing and visualization.

Instead of simply recording that someone moved, the system can analyze the characteristics of that movement.

This creates the possibility of recognizing different physical activities and determining whether an exercise is being performed correctly.

For example, if a particular exercise requires a specific bending angle or movement pattern, the system can compare the measured signal with the expected technique. If the movement deviates from the correct pattern, the system can identify the error.

It can then provide motion correction and scoring, potentially helping users improve their exercise technique.

The Device Can Generate a Surprisingly High Voltage

One of the interesting results reported by the researchers was the electrical output produced by a simple human action.

During an ordinary clap, the FL-TENG generated an instantaneous output of approximately 241 volts.

However, voltage alone does not tell us how much useful power the device can deliver. The available current and overall power are also important. TENG devices typically produce electrical signals that are better suited to low-power electronics and sensing applications than to powering large household appliances.

That makes this technology particularly interesting for small wireless sensors, wearable electronics, and other low-power devices.

The bigger advantage is that the system can potentially generate energy directly from the user's movement rather than relying entirely on a conventional battery.

Why the Hydrogel Electrode Matters

Another important feature of the design is its hydrogel electrode.

Traditional metal electrodes such as copper can provide excellent electrical conductivity, but repeated bending and stretching can eventually create mechanical fatigue. This can be a significant problem for wearable electronics because the device may need to move continuously with the user's body.

Hydrogel electrodes offer greater flexibility and stretchability.

Because they can deform with the device, they are better suited to applications involving repeated human movement. The researchers found that using hydrogel helped improve the service life and stability of the FL-TENG.

This is particularly important for wearable technology, where comfort and durability are just as important as electrical performance.

A Self-Powered Future for Wearable Healthcare

Modern health-monitoring devices often depend on batteries. Batteries need to be recharged or eventually replaced, which can reduce convenience and contribute to electronic waste.

A self-powered sensor offers a different approach.

If the movement of the person wearing the device can provide at least part of the energy needed to operate the sensing and wireless system, the dependence on external power sources can be reduced.

TENG-based systems could therefore become useful for applications such as fitness tracking, rehabilitation, wearable healthcare, human–computer interaction, and Internet of Things devices.

Combined with artificial intelligence and machine-learning algorithms, these sensors could become even more capable. Instead of simply collecting movement data, future systems could automatically recognize movement patterns, detect abnormalities, and provide personalized feedback.

More Than Just an Energy Harvester

The most interesting aspect of Mao and his team's work is that the technology combines several functions into one flexible platform.

The FL-TENG does not simply generate electricity. It simultaneously harvests mechanical energy, senses movement, communicates information wirelessly, and supports intelligent motion analysis.

This could be particularly valuable in sports and rehabilitation.

Incorrect exercise techniques can place unnecessary stress on muscles and joints. A wearable system capable of detecting these errors could provide immediate feedback, helping users learn safer and more effective movement patterns.

For rehabilitation patients, similar technology could potentially help therapists monitor exercises and track whether movements are being performed according to a prescribed technique.

The Road Ahead

The research demonstrates how human movement itself can become a useful source of energy for wearable electronics while also providing valuable information about physical activity.

The FL-TENG's flexible structure, hydrogel electrode, wireless communication capability, and motion-analysis functions make it an interesting example of how energy harvesting and intelligent healthcare can be combined into a single system.

There are still challenges before technologies like this become common consumer products. Improving long-term durability, power management, wireless communication, signal processing, and large-scale manufacturing will be important.

Nevertheless, the concept points toward a future in which wearable sensors do not always need to depend on frequent battery charging.

Instead, the simple act of moving your body could help power the technology that is monitoring that movement.

That combination of sustainable energy harvesting and intelligent motion analysis could open new possibilities for sports, healthcare, rehabilitation, and next-generation self-powered wearable devices.

Reference: Mao, Y.; Sun, F.; Zhu, Y.; Jia, C.; Zhao, T.; Huang, C.; Li, C.; Ba, N.; Che, T.; Chen, S. Nanogenerator-Based Wireless Intelligent Motion Correction System for Storing Mechanical Energy of Human Motion. Sustainability 2022, 14, 6944. https://doi.org/10.3390/su14116944

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