Due to the advantages of natural softness and flexibility of water, liquid–solid‐based triboelectric nanogenerators (TENGs) have aroused wide attention recently and much effort has been devoted to improving its output performance. Herein, the performance of liquid–solid‐based TENG is greatly improved through two simple steps. First, an end electrode is added into the traditional tube‐based TENG and the volume effect is successfully realized, with the output voltage improved by ≈40 times to 240 V. Then, the output voltage of the tube‐based TENG can be further improved to 461 V by replacing water with NaOH solution and an impressive peak power density of 1910 Wm−3 and an average power density of 459 Wm−3 can be achieved. Additionally, the demonstration shows that the solution‐tube‐based volume effect TENG can work well at various operation modes and generate power from multiple mechanical energy sources. In addition to wearable human motion energy recovery, wave energy recovery, and electrochemical cathodic protection systems, the device also shows its application potential in biochemical sensing based on the solute concentration‐dependent output signal.

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CdS is a well-known visible-light-sensitive semiconductor and has been widely used in photocatalysis. In order to improve the photocatalytic of CdS, CdS structures with different kinds of surfactants were synthesized by hydrothermal method.

Photocatalysts used for energy shortage and environmental pollution under visible light have been drawn much attention. CdS has been regarded as an excellent photocatalysts, and CdS/CuS composite generates higher H2 production than that of CdS.

With the popularization of the Internet of Things, the application of chemical sensors has become more and more extensive. However, it is difficult for a single functional sensor to meet multiple needs at the same time. For the next generation of chemical sensors, in addition to rapid qualitative and quantitative detection, it is also necessary to solve the problem of a distributed sensor power supply. Triboelectric nanogenerator (TENG) and surface-enhanced Raman scattering (SERS) are two emerging technologies that can be used for chemical testing. The combination of TENG and SERS technology is proposed to be an attractive research strategy to implement qualitative and quantitative analysis, as well as self-powered detection in one device. Herein, the Ag nanoparticle (NP)@polydimethylsiloxane (PDMS) plasmonic cavity is demonstrated, which can be exploited not only as a SERS substrate for qualitative analysis of the target molecules but also as a TENG based self-powered chemical sensor for rapid quantitative analysis. More importantly, the as-designed plasmonic cavity enables prolonged triboelectric field generated by the phenomena of triboelectricity, which in turn enhances the “hot spot” intensities from Ag NPs in the cavity and boosts the SERS signals. In this way, the device can have good feasibility and versatility for chemical detection. Specifically, the measurement of the concentration of many analytes can be successfully realized, including ions and small molecules. The results verify that the proposed sensor system has the potential for self-powered chemical sensors for environmental monitoring and analytical chemistry.