A flexible composite-based piezoelectric nanogenerator (PENG) with low cost, stable properties, and sensitivity to mechanical deformation is highly suitable for constructing self-powered sensing layers for distributed electrical transmission power lines. However, the lower output performance of the PENG resulting from inadequate effective polarization hinders its integration with energy management circuits and signal recognition systems. In this study, we propose a high-performance PENG by designing a new piezoelectric ceramic fiber, where (Ba,Ca)(Zr,Ti)O₃ (BCZT)@Ag nanoparticles are grown on the surface of BCZT fibers to form a branch-heterostructure, leading to enhanced charge transport mechanisms and induced polarization in the PENG. The branch-heterostructure ceramic fiber-based PENG results in significantly increased outputs of 96.4 V and 15.52 µA, which are approximately 3.2 and 6.5 times greater than those of the PENG without a specific design. Moreover, an intelligent power Internet of Things (power IoT) system through the synergistic integration of this high-performance PENG and learning-assisted data analytics has been constructed, which enables accurate self-powered real-time monitoring of abnormal vibration states in transmission power lines to prevent rupture-related failures with approximately 96% identification accuracy. This work not only provides an effective strategy to increase the performance of PENGs but also broadens the application prospects of lead-free piezoelectric ceramics in power IoTs.

High cost and restricted activity of electrocatalysis are the major challenges for hydrogen generation and biosensors. In this work, we provided a one-pot synthesis of Cu_xPd_y alloy nanoparticles (NPs) with controllable atomic ratio and “clean surface”. Benefiting from the preferable d-band structure, the Cu₆₂Pd₃₈ NPs exhibited a lower overpotentials in the hydrogen evolution reaction (HER) over the full pH range. In the acidic media, Cu₆₂Pd₃₈ NPs achieved a low overpotential of 28.12 mV for HER, which was 25.73% of Pd NPs. In the neutral solution, the overpotential by Cu₆₂Pd₃₈ NPs is only 41.71% for that by uncleaned CuPd NPs. In alkaline media, the overpotential by Cu₆₂Pd₃₈ NPs was declined from 38.01 to 20.20 mV after 720 min yielding hydrogen, which was only 53.14% for the initial overpotential. As applied in biosensor, the synergistic effect of Cu and Pd accelerated the kinetics of electrocatalytic process, resulting in an enhanced performance. The glucose sensor constructed by Cu₆₇Pd₃₃ exhibited a wider detection range up to 100.0 mM. And the sensitivity is 379.4 µA/(mM·cm²), which is ca. 4.63 and 14.09 folds for that by pure Cu NPs and Pd NPs, respectively. An optimal atomic percent would be conducive to optimize electrocatalytic activity of Cu_xPd_y alloy. The volcano plots for Cu_xPd_y would open up a new avenue for designing electrocatalysis with rationalized cost and optimized performance.