Xin Li

Xidian University

Energy harvesting technology has become a crucial way to accomplish battery-free wireless sensor networks. Although the output power of the wearable energy harvester has been significantly improved, the bandwidth of the energy harvester is still a key issue that hinders the applications of the energy harvester since the output power could dramatica...

Vortex-induced vibrations (VIV) often occur in many engineering situations, such as offshore structures, large-span bridges, and fluid piping systems. Harnessing energy from VIV, on the one hand, can provide a sustainable power supply to the essential sensing devices for structural health monitoring; on the other hand, it can dissipate the vibratio...

The self-powered wireless switch is one of the successful battery-free electronic products, which can be fully powered by a small mechanical energy harvesting (MEH). In most existing designs, bistable toggling electromagnetic energy harvesters are utilized to extract the mechanical energy associated with the switch toggling motions. Although such M...

Wildfires often cause severe air pollution, substantial economic losses, human mortality, and environmental damage. However, their early alarming functionality still needs much improvement. Here, we report a self-powered IntelliSense wildfire detection and alarm system (SPIS-WDAS). For this purpose, the all-solid, self-healable, sustainable, fire r...

Long-term monitoring of the vertical displacement and the service status of the steel springs is critically important to ensure the operation safety of the railway. However, powering the monitoring system is still a challenging issue. To address this issue, a piezoelectric smart backing ring is designed and fabricated for harvesting the kinetic ene...

A considerable amount of ambient vibration energy spreads over an ultra-low frequency spectrum. However, conventional resonant-type linear energy harvesters usually operate within high and narrow frequency bands, which cannot match the frequencies of many vibration sources. If the excitation frequency deviates a bit from the natural frequency of an...

In this work, the design, fabrication and test of a novel Origami-inspired triboelectric nanogenerator (TENG) are presented. The excellent performance of the proposed Origami-TENG is attributed to its stacked architecture and, thereby, the enlarged effective contact area. The mechanism of effective area enlargement is explained through mathematical...

The emerging energy harvesting technology facilitates the development of ubiquitous and everlasting battery-free motion detectors. This paper introduces a robust design of the transient-motion-powered motion detector, which is called ViPSN-pluck. “ViPSN” is the acronym for vibration-powered sensing node while “pluck” stands for the plucking-motion...

3D printing (also known as additive manufacturing) has been developed for more than 30 years. The applications of 3D printing have been increasingly extended to a variety of engineering fields in recent years. The sandwich material with a high strength and overall low density is a kind of artificial material that has been extensively used in variou...

With growing interest in artificial intelligence and the Internet of Things, self‐powered electronics have gained considerable attention. In this investigation, a wind‐driven hybrid nanogenerator system comprising a poly(l‐lactic acid)‐based piezoelectric nanogenerator and a poly(tetrafluoroethylene) electret‐based triboelectric nanogenerator (E‐TE...

In this paper, we introduce ViPSN-E: a transient-motion-powered IoT sensor node. It carries out motion detection and wireless communication by making good use of the energy harvested from an instantaneous motion. In our design, a piezo-magneto-elastic structure, which is composed of a low-cost piezoelectric cantilever and a pair of magnets, is used...

In this paper, we introduce ViPSN (acronym of vibration-powered sensing node), a programmable Internet of Things (IoT) platform for the development of vibration-or motion-powered sensing and transmitting systems. It leverages the exploitation and utilization of ambient vibration energy by using a piezoelectric transducer. The roles and relations of...

To survive under interference is a critical requirement of Wireless Sensor Networks (WSNs) in practical applications. At present, existing solutions can be divided into two categories: waiting in time and hopping in channels. However, the interference can be continuously in high-intensity and covers all the channels from 11 to 26 of IEEE 802.15.4....

Concurrent transmission (CT)-based wireless sensor networks, where nodes transmit at the same moment upon receiving successfully, begin to be applied to real-world scenarios. CT-based protocols have been proven experimentally that they can achieve good the end-to-end performance, namely high reliability, low latency, and high energy efficiency. For...