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Title: Engineering the electrochemical temperature coefficient for efficient low-grade heat harvesting
Authors: Gao, Caitian
Yin, Yuling
Zheng, Lu
Liu, Yezhou
Sim, Soojin
He, Yongmin
Zhu, Chao
Liu, Zheng
Lee, Hyun-Wook
Yuan, Qinghong
Lee, Seok Woo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Gao, C., Yin, Y., Zheng, L., Liu, Y., Sim, S., He, Y., . . . Lee, S. W. (2018). Engineering the electrochemical temperature coefficient for efficient low-grade heat harvesting. Advanced Functional Materials, 28(35), 1803129-. doi:10.1002/adfm.201803129
Journal: Advanced Functional Materials
Abstract: Low-grade heat to electricity conversion has shown a large potential for sustainable energy supply. Recently, the low-grade heat harvesting in the thermally regenerative electrochemical cycle (TREC) is a promising candidate with high energy conversion efficiency. In this system, the electrochemical temperature coefficient (α) plays a dominant role in efficient heat harvesting. However, the internal factors that affect α are still not clear and significant improvements are needed. Here, α of various Prussian Blue analogues (PBAs) is investigated and their lattice change during cation intercalation is monitored using the ex situ X-ray diffraction (XRD) method. For the first time, it is found that α is highly related to the lattice parameter change. Large lattice shrinkage exhibits a large negative α, while lattice expansion is corresponding to a positive α. These are mainly attributed to the different phonon vibration entropy changes upon cation intercalation in various PBAs. Especially, purple cobalt hexacynoferrate delivers the largest α of −0.89 mV K−1 and enables highly efficient heat conversion efficiency up to 2.65% (21% of relative efficiency). The results of this study provide a fundamental understanding of temperature coefficient in electrochemical reactions and pave the way for designing high-performance material for low-grade heat harvesting.
ISSN: 1616-301X
DOI: 10.1002/adfm.201803129
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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