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BCZT-CuY/rGO/PDMS composites with excellent elasticity and flexibility, and their nanogenerators (NGs) with favorable electrical properties, were fabricated. The impact of rGO on the dispersion of BCZT-CuY, the mechanical properties of BCZT-CuY/rGO/PDMS, and electrical performance of BCZT-CuY/rGO-based NGs were systematically investigated. The results indicated that the distribution of BCZT-CuY in PDMS with added rGO was much more uniform than that without rGO. Moreover, its elastic modulus and elongation at the break increased to 4.6 MPa and 250%, respectively, with the introduction of rGO. Apart from a high d 33 at the percolation threshold, the average V OC (1.36 V) and I SC (35nA) achieved by finger tapping BCZT-CuY/rGO-based NGs suggested their considerable potential in harvesting tiny energy. [ABSTRACT FROM AUTHOR]

Lead-free (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 )O 3 -xwt%CuOywt%Y 2 O 3 (BCZT-Cu x Y y ) ceramics with high piezoelectricity were synthesized by the conventional solid-state reaction method. The role of Cu and Y (Cu/Y) in sintering, phase transition, and electrical properties of such ceramics was systematically studied. The results indicated that the sintering temperatures of BCZT-Cu x Y y decreased by at least 100 °C due to the low melting point of CuO. The promotion effect of Cu/Y on phase transition lied in the improvement of T C by 5–15 °C and the coexistence of O+T phase near room temperature. The contribution of Cu/Y to electrical properties was mainly ascribed to the grains growth, the formed oxygen vacancies and lattice distortions, and the donor doping effect of Y 3+ . Adding 0.10 wt% Cu 2+ and 0.06 wt% Y 3+ into BCZT dramatically improved the electrical properties as following: d 33 = 552 pC/N, ε m = 10175, ε r = 4546, tanδ = 0.016, T C = 100 °C, k p = 0.475, Q m = 157.2, P r = 10.82 μC/cm 2 and E C = 2.33 kV/cm. A plausible mechanism was obtained to explain the reaction process and the favorable performances of BCZT-Cu x Y y . Co-doping Cu 2+ and Y 3+ into BCZT could be a promising method to improve and balance the sintering, phase transition, and electrical properties for potential practical applications of lead-free piezoceramics. [ABSTRACT FROM AUTHOR]