2，5-二羟基苯磺酸增强离子水凝胶材料热电性能的研究

doi:10.11949/0438-1157.20230474

摘要/Abstract

摘要：

目前离子导体热电材料在低品位热源方面的热电转换研究已有一定进展，但仍存在热电转换效率低和可持续性差等问题。研究了2, 5-二羟基苯磺酸盐（HQS）在不同条件下对离子热电水凝胶材料热电性能的影响。利用质子耦合电子转移（PCET）反应协同高扩散系数的质子的Soret效应，结果表明引入HQS可以提升热电性能，其热电势19.16 mV·K^-1，离子热电优值0.98，热电转换效率为0.19%。在20 K温差下，可以维持120 mW·m^-2的功率输出近2.5 h。

关键词: 离子热电, 2, 5-二羟基苯磺酸, 质子耦合电子转移, 热电性能

Abstract:

At present, ion conductor thermoelectric materials have made some progress in thermoelectric conversion of low-grade heat sources, but there are still problems such as low thermoelectric conversion efficiency and poor sustainability. This study investigated the effect of 2,5-dihydroxybenzenesulfonate (HQS) on the thermoelectric properties of ionic thermoelectric hydrogels under different conditions. By combining proton-coupled electron transfer (PCET) reaction with the Soret effect of protons with high diffusion coefficient, the results showed that the introduction of HQS can enhance the thermoelectric performance with a thermopower of 19.16 mV·K^-1, an ionic thermoelectric figure of merit of 0.98, and a thermoelectric conversion efficiency of 0.19%. At a temperature gradient of 20 K, it can maintain a power output of 120 mW·m^-2 for nearly 2.5 hours.

Key words: ionic thermoelectrics, 2,5-dihydroxybenzenesulfonate, proton-coupled electron transfer, thermoelectric performances

中图分类号:

TB 34

王阳, 戴永强, 曾炜. 2，5-二羟基苯磺酸增强离子水凝胶材料热电性能的研究[J]. 化工学报, 2023, 74(9): 3946-3955.

Yang WANG, Yongqiang DAI, Wei ZENG. Study of the enhanced thermoelectric properties of ionic hydrogel materials by 2,5-dihydroxybenzenesulfonate[J]. CIESC Journal, 2023, 74(9): 3946-3955.

图/表 12

图1 HQS和BQS的氧化还原图解说明[17]

Fig.1 Illustration of the redox reactions between HQS and BQS[17]

图2 PAM-co-PAAH水凝胶截面的SEM图像

Fig.2 SEM cross-section images of PAM-co-PAAH hydrogel

图3 HQS离子热电水凝胶的开路电压与热电势

Fig.3 Open circuit voltage and thermopower of HQS ionic thermoelectric hydrogel

图4 HQS离子热电水凝胶的瞬时功率变化

Fig.4 Transient thermoelectric power variation of HQS ionic thermoelectric hydrogel

图5 纯酸离子热电水凝胶与HQS离子热电水凝胶的开路电压建立响应变化

Fig.5 The open circuit voltage establishment response of pure acid ion thermoelectric hydrogel and HQS ion thermoelectric hydrogel

图6 不同浓度HQS离子热电水凝胶及纯酸离子水凝胶的交流阻抗图谱与电导率变化

Fig.6 AC impedance profiles and conductivity changes of HQS ionic thermoelectric hydrogels with different concentrations and pure acid ionic hydrogels

图7 HQS离子热电材料的离子热导率

Fig.7 Ionic thermal conductivity of HQS thermoelectric gel

图8 HQS水凝胶在建立不同的温度梯度前后的循环伏安曲线

Fig.8 Cyclic voltammetry curves of HQS hydrogels before and after establishing different temperature gradients

表1 HQS离子热电水凝胶循环伏安数据变化

Table 1 Cyclic voltammetry data variation of HQS ionic thermoelectric hydrogels

ΔT/K	V_c/V	I_c/mA	V_a/V	I_a/mA	\|V_c/V_a\|	\|I_c/I_a\|
5	-0.38	-3.32	0.42	3.02	0.90	1.10
10	-0.44	-4.52	0.45	4.22	0.98	1.07
15	-0.46	-6.46	0.46	6.68	1.00	0.97
20	-0.41	-7.06	0.42	7.92	0.98	0.89
25	-0.37	-6.63	0.39	7.63	0.95	0.87
30	-0.35	-5.72	0.38	7.07	0.92	0.81

图9 HQS水凝胶建立电压后负载输出的性能

Fig.9 Performance of load output after voltage establishment of HQS hydrogel

图10 HQS水凝胶的热电转换能力

Fig.10 Thermoelectric conversion capacity of HQS hydrogel

图11 热电材料的热电势与功率密度的对比

Fig.11 Comparison of thermoelectric potential and power density of thermoelectric materials

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