Multilayer Electrode Strategy Shorten Thermal Charging Time and Boost Energy Output in Gelatin-Based i-TE Cells,Advanced Energy Materials

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Multilayer Electrode Strategy Shorten Thermal Charging Time and Boost Energy Output in Gelatin-Based i-TE Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-09-03 , DOI: 10.1002/aenm.202402621
Yuchen Li ₁ , Shuaihua Wang ₁ , Mao Yu ₁ , Huan Li ₁ , Benben Li ₁ , Kang Zhu ₁ , Weishu Liu _{1,

2}

Affiliation

Gel-based ionic thermoelectric (i-TE) cells provide alternative thermal energy harvesting from the environment, showing obvious advantages in voltage matching for self-powered Internet-of-Things (IoT) sensors. However, the gel-based i-TE cells always suffer a long thermal charging time and poor output power performance. Herein, a multilayer electrode engineering strategy is proposed from the device-design level, aiming to decrease the ions' diffusion distance, increase the electrode surface area, and facilitate the ions' reaction and recovery process. The thermal charging time is shortened from 27 to 8 min as the electrode layers increase from 2 to 8. An ultrahigh instantaneous power density of 15.8 mW m⁻² K⁻² and 2 h output energy density (E_2h) of 403 J m⁻² are achieved in an 8-layer electrode i-TE cell. Finally, A flexible and wearable i-TE device with 20 units is demonstrated to generate a remarkable voltage of 3.8 V and output power of 282 µW by harvesting the human body heat. This work provides a feasible and effective route to design the i-TE device, hopefully promoting its practical power generation application.

中文翻译：

多层电极策略缩短了基于明胶的 i-TE 电池的热充电时间并提高了能量输出

基于凝胶的离子热电（i-TE）电池提供从环境中收集的替代热能，在自供电物联网（IoT）传感器的电压匹配方面显示出明显的优势。然而，基于凝胶的 i-TE 电池总是存在热充电时间长和输出功率性能不佳的问题。本文从器件设计层面提出了一种多层电极工程策略，旨在减小离子的扩散距离，增加电极表面积，促进离子的反应和回收过程。随着电极层数从 27 层增加到 8 层，热充电时间从 27 分钟缩短到 8 分钟。在 8 层电极 i-TE 电池中实现了 15.8 mW ^m-2 ^K-2 的超高瞬时功率密度和 403 J ^m-2 的 2 h 输出能量密度（E_2h）。最后，展示了一个具有 20 个单元的柔性可穿戴 i-TE 设备，通过收集人体热量，可产生 3.8 V 的显着电压和 282 μW 的输出功率。这项工作为设计 i-TE 装置提供了一条可行且有效的路线，有望促进其实际发电应用。

更新日期：2024-09-03

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