Composite-based piezoelectric devices are extensively studied to develop sustainable power supply and selfpowered devices owing to their excellent mechanical durability and output performance. In this study, we design a leadfree piezoelectric nanocomposite utilizing (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (BCTZ) nanomaterials for realizing highly flexible energy harvesters. To improve the output performance of the devices, we incorporate porous BCTZ nanowires (NWs) into the nanoparticle (NP)-based piezoelectric nanocomposite. BCTZ NPs and NWs are synthesized through the solidstate reaction and sol-gel-based electrospinning, respectively; subsequently, they are dispersed inside a polyimide matrix. The output performance of the energy harvesters is measured using an optimized measurement system during repetitive mechanical deformation by varying the composition of the NPs and NWs. A nanocomposite-based energy harvester with 4:1 weight ratio generates the maximum open-circuit voltage and short-circuit current of 0.83 V and 0.28 A, respectively. In this study, self-powered devices are constructed with enhanced output performance by using piezoelectric energy harvesting for application in flexible and wearable devices.

1. Introduction
2. Experimental
    2.1. 구형 및 선형 BCTZ 나노입자의 합성
    2.2. BCTZ-PI 나노복합체 기반의 압전 에너지 하베스터제작
3. Results and Discussion
4. Conclusion
Acknowledgement
References

• 김광현(경북대학교 대학원 첨단소재공학부 금속재료공학전공) | Gwang Hyeon Kim (School of Materials Science and Engineering, Kyungpook National University (KNU), Daegu, Republic of Korea)
• 박현준(경북대학교 대학원 첨단소재공학부 금속재료공학전공) | Hyeon Jun Park (School of Materials Science and Engineering, Kyungpook National University (KNU), Daegu, Republic of Korea)
• 배빛나(경북대학교 대학원 첨단소재공학부 금속재료공학전공) | Bitna Bae (School of Materials Science and Engineering, Kyungpook National University (KNU), Daegu, Republic of Korea)
• 장학수(경북대학교 대학원 첨단소재공학부 금속재료공학전공) | Haksu Jang (School of Materials Science and Engineering, Kyungpook National University (KNU), Daegu, Republic of Korea)
• 김철민(경북대학교 대학원 첨단소재공학부 금속재료공학전공) | Cheol Min Kim (School of Materials Science and Engineering, Kyungpook National University (KNU), Daegu, Republic of Korea)
• 이동훈(경북대학교 신소재공학부 금속신소재공학전공) | Donghun Lee (School of Materials Science and Engineering, Kyungpook National University (KNU), Daegu, Republic of Korea)
• 박귀일(경북대학교 대학원 첨단소재공학부 금속재료공학전공, 경북대학교 신소재공학부 금속신소재공학전공) | Kwi-Il Park (School of Materials Science and Engineering, Kyungpook National University (KNU), Daegu, Republic of Korea) Corresponding author