在锂改性钽酸铌钾中提高湿度敏感性和可能的能量收集器
Materials Chemistry and Physics
(
IF
4.7
)
Pub Date : 2022-06-10
, DOI:
10.1016/j.matchemphys.2022.126384
Satyam Kumar
,
Vikas N. Thakur
,
Ravikant
,
Rajnish Kurchania
,
Ram S. Katiyar
,
Ashok Kumar
(K 0.9 Li 0.1 )[(Ta 0.2 Nb 0.8 ) 0.99 Mn 0.01 ]O 3 (KLTN)电陶瓷在各种湿度条件下表现出快速的湿度响应、长时间的电阻稳定性和巨大的灵敏度(≈2.6×104) 在 95% RH 下，大约是纯 KTa 0.2 Nb 0.8 O 3 (KTN) 多晶样品的五倍。在 15%–95% 的湿度范围内，KLTN 在吸附和解吸测量期间的电阻值显示出小的滞后。电流-电压数据表明存在 1.6 V 的开路电压 (V OCV ) 和短路电流 (I SCC) 在 95% 相对湿度下为 1–2 μA，在串联和并联几个湿度传感器后，它又会点亮标准的红色发光二极管 (LED)。这可能有助于在偏远潮湿的沿海地区收集能量；但是，对于作为能量收集器的实际应用，它需要进一步优化。经过几次重复循环后，吸附和解吸数据表明 KLTN 可能是敏感湿度传感器和能量收集器的潜在候选者。
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Improved humidity sensitivity and possible energy harvesters in lithium modified potassium niobium tantalate oxide
The (K0.9Li0.1)[(Ta0.2Nb0.8)0.99Mn0.01]O3 (KLTN) electroceramics exhibit fast humidity response, long time resistance stability under various humidity conditions, and giant sensitivity (≈2.6×104) at 95% RH, which is approximately five times higher than pure KTa0.2Nb0.8O3 (KTN) polycrystalline sample. The KLTN shows a small hysteresis in resistance values during adsorption and desorption measurement within the humidity range of 15%–95%. The current-voltage data indicate the presence of an open-circuit voltage (VOCV) of 1.6 V with short circuit current (ISCC) 1–2 μA at 95% relative humidity, which in turn glows a standard red light-emitting diode (LED) after series and parallel connection of a few humidity sensors. This may be useful for energy harvesting in the remote and humid coastal region; however, it requires further optimization for real applications as energy harvesters. After several repeated cycles, the adsorption and desorption data suggest that KLTN may be a potential candidate for sensitive humidity sensors and energy harvesters.
更新日期：2022-06-10