Coordination enhanced high-seebeck coefficient n-type gel-based thermocells for low-grade energy harvesting and n-p type connected devices

Jia, Yuhang; Zhang, Shengming; Li, Jing; Han, Zhiliang; Zhang, Dong; Qu, Xiangyang; Chen, Shiyan; Wang, Huaping

doi:10.1016/j.jpowsour.2024.234400

Journal of Power Sources

2024

DOI: 10.1016/j.jpowsour.2024.234400

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Coordination enhanced high-seebeck coefficient n-type gel-based thermocells for low-grade energy harvesting and n-p type connected devices

Yuhang Jia,

Shengming Zhang,

Jing Li

et al.

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2024

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Cited by 2 publications

References 38 publications

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High‐Performance Quasi‐Solid‐State Thermogalvanic Cells with Metallized Fibril‐Based Textile Electrodes and Structure‐Breaking Salts

Choi,

Mo,

Jung

et al. 2024

Advanced Energy Materials

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Thermogalvanic cells (TGCs) convert heat into electricity through thermoelectrochemical reactions of redox couples, generating a millivolt‐scale Seebeck coefficient. However, TGCs based on liquid electrolytes are prone to leakage, whereas quasi‐solid‐state TGCs (QTCs) using gel‐based electrolytes typically have low power outputs due to slow ion diffusion and limited reaction rates. Herein, we present novel strategies for developing high‐performance all‐flexible QTCs using both metallized fibril‐based textile electrodes with extremely large surface area, (specifically Ni textiles), and structure‐breaking salts for hydrogel electrolytes. The electrodes are oxidized to create Ni and Ni oxide heterostructures, forming numerous O vacancy defects that enhance redox reactions. Meanwhile, the structure‐breaking salts facilitate redox reactions and improve ion diffusion by disrupting water structures in the hydrogel electrolyte. These advancements significantly enhance the performance of the QTCs without the need for precious‐metal electrodes, achieving a remarkable maximum power density of 4.05 mW m−2 K−2 and a record‐high effective cell conductivity of 17.3 S m−1, compared to previously reported QTCs. Finally, the proposed QTCs can generate a stable open‐circuit voltage and output power for wearable applications owing to the flexibility of the electrodes and electrolyte, achieving successful electronic device operation using body heat from the forearm (ΔT ≈ 2 K).

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High‐Performance Quasi‐Solid‐State Thermogalvanic Cells with Metallized Fibril‐Based Textile Electrodes and Structure‐Breaking Salts

Choi,

Mo,

Jung

et al. 2024

Advanced Energy Materials

View full text Add to dashboard Cite

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Wearable Device with High Thermoelectric Performance and Long‐Lasting Usability Based on Gel‐Thermocells for Body Heat Harvesting

Jia,

Zhang,

et al. 2024

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Utilizing the thermogalvanic effect, flexible thermoelectric materials present a compelling avenue for converting heat into electricity, especially in the context of wearable electronics. However, prolonged usage is hampered by the limitation imposed on the thermoelectric device's operational time due to the evaporation of moisture. Deep eutectic solvents (DESs) offer a promising solution for low‐moisture gel fabrication. In this study, a bacterial cellulose (BC)/polyacrylic acid (PAA)/guanidinium chloride (GdmCl) gel is synthesized by incorporating BC into the DES. High‐performance n‐type and p‐type thermocells (TECs) are developed by introducing Fe(ClO4)2/3 and K3/4Fe(CN)6, respectively. BC enhances the mechanical properties through the construction of an interpenetrating network structure. The coordination of carboxyl groups on PAA with Fe3+ and the crystallization induced by Gdm+ with [Fe(CN)6]4− remarkably improve the thermoelectric performance, achieving a Seebeck coefficient (S) of 2.4 mV K−1 and ion conductivity (σ) of 1.4 S m−1 for the n‐type TEC, and ‒2.8 mV K−1 and 1.9 S m−1 for the p‐type TEC. A flexible wearable thermoelectric device is fabricated with a S of 82 mV K−1 and it maintains a stable output over one month. This research broadens the application scope of DESs in the thermoelectric field and offers promising strategies for long‐lasting wearable energy solutions.

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Coordination enhanced high-seebeck coefficient n-type gel-based thermocells for low-grade energy harvesting and n-p type connected devices

Cited by 2 publications

References 38 publications

High‐Performance Quasi‐Solid‐State Thermogalvanic Cells with Metallized Fibril‐Based Textile Electrodes and Structure‐Breaking Salts

High‐Performance Quasi‐Solid‐State Thermogalvanic Cells with Metallized Fibril‐Based Textile Electrodes and Structure‐Breaking Salts

Wearable Device with High Thermoelectric Performance and Long‐Lasting Usability Based on Gel‐Thermocells for Body Heat Harvesting

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