Tunable Entropy Oxides: A Pathway to Design Giant Dielectric Materials for Energy Harvesting

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Abstract High entropy oxides have received widespread attention for their tunable structures and fascinating multifunctional properties. However, the systematic investigations of a number and the choice of oxides endow tunable entropy oxides (TEOs) with numerous untapped potentials, making them prospective future materials. In this article, the successful synthesis of TEOs is demonstrated, a pathway to design materials with giant dielectric (ε r ) by taking different numbers of oxides among MnO, NiO, Fe 2 O 3 , ZnO, and Al 2 O 3 , through a cost‐effective ball mill technique, followed by annealing and keeping the same crystal structure. All TEOs exhibiting A 3 O 4 type spinel structure with tunable mixed valence states remarkably display giant ε r of 6.85 × 10 7 , 8.66 × 10 7 , 4.59 × 10 6 , and 1.31 × 10 4 and tunable conductivity of 2.5 × 10 −5 , 3.7 × 10 −5 , 7.1 × 10 −6 , 2.4 × 10 −6 S cm −1 for TEO‐2, TEO‐3, TEO‐4, TEO‐5. Theoretical density functional analysis supports these superior properties. Among various triboelectric nanogenerator (TENG) devices, the TEO‐3‐based TENG produces high‐performance electrical output of 210–283 V, 0.2–0.291 µA, 18–27 nC, and 9.56–79.24 µW from various biomechanical activities. These results endorse the potential for sustainable energy harvesting, powering low‐power electronic devices, and enabling TEOs as candidates for triboelectric material.

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