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(a) Schematic diagram of the synthesis process of the sea sponge−inspired 3D piezoelectric composite. (b) SEM micrograph of the BCZT porous structure. A cross−sectional SEM micrograph of the porous BCZT. (c) XRD pattern and Raman spectrum (inset) of the sea sponge−inspired BCZT porous structure. (d) A photograph of elastic PCG. (e) Generated open−circuit voltage signals from PCG by compressing and releasing under forward and reverse connections. Reproduced with permission [81].
