High pyroelectric response over a broad temperature range in NBT-BZT: SiO2 composites for energy harvesting

Enhanced Dielectric Energy Storage Performance of 0.45Na0.5Bi0.5TiO3-0.55Sr0.7Bi0.2TiO3/AlN 0–3 Type Lead-Free Composite Ceramics

“…Usually, the second phase would be dispersed at the grain boundaries in the ceramic matrix. A large number of studies have proved that adding a second phase can prevent the matrix from breaking down in boundaries first and achieve a uniform microstructure by suppressing grain growth. − Moreover, the second phase can also improve the E b of the relaxor ferroelectric ceramics without impairing the inherent properties of the ceramic matrix, such as relatively high dielectric constant (ε) and maximum polarization ( P max ). − The second phase with low ε r and high E b , such as SiO 2 and MgO, has a higher E b than the matrix. ,− Ma et al successfully synthesized 0.95­(0.76Na 1/2 B i 1/2 TiO 3 -0.24SrTiO 3 )-0.05AgNbO 3 /SiO 2 (NBT-ST-5AN/SiO 2 ) relaxor ferroelectric ceramics, achieving a super high E b of 316 kV/cm, but its energy efficiency is still low, about 75% . Liu et al found that moderate amount of SiO 2 can increase E b of Ba 0.4 Sr 0.6 TiO 3 / x wt %SiO 2 .…”

SrTiO3‐modified Bi0.5Na0.47Li0.03Ti0.99Sn0.01O3 relaxor ferroelectric ceramics with high energy storage performance

“…8,9 It is well known that relaxor FEs are prospective dielectric energy storage candidates owing to the high P max and low P r . 10,11 As an environmentally friendly relaxor FE ceramic, bismuth sodium titanate ceramic (Bi 0.5 Na 0.5 TiO 3 , abbreviated as BNT) is considered a potential energy storage ceramic because of its large maximum polarization strength (P max ≥ 40 μC/cm 2 ) owing to the orbital hybridization of Bi 6p and O 2p. 12,13 However, the large P r and leakage current of BNT produce low W rec , which limits its application in energy storage.…”

Continuous Phase Change Materials for Power Generation from Daily Air Temperature Cycles

“…To date, pyroelectric devices [11][12][13][14][15][16][17][18][19] and combined devices of a phase change material (PCM) and TED [20][21][22][23] have been investigated for electricity generation from the surrounding temperature cycles. Additionally, thermal metmaterial-based power generators [24] that convert infrared light to electricity are possibly used for power generation from temperature cycles.…”

“…Thus, the power obtained from pyroelectric devices is small (typically tens of nanowatts) upon applying temperature fluctuations comparable to the daily temperature cycles. [13][14][15] In contrast, a combined device of a PCM and a TED (PCM/TED) can be designed for power generation from temperature cycles over a period of a day. [22] An ambient temperature cycle around a PCM/TED induces repeated phase transition of the PCM, which cause a heat flux between the ambient air and the PCM.…”

“…[25][26][27][28] The amount of heat flux increases with increasing temperature difference (ΔT) between the highest temperature (HT) and lowest temperature (LT) of the ambient temperature cycle. [14] Thus, considerable research has been undertaken on PCM/TEDs for use in places where the variation in temperature is large, such as on airplane sidewalls [29,30] and outdoor places with direct sunlight irradiation. [31][32][33][34] .…”