期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 32, 页码 28894-28899出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08381
关键词
thermocell; porous electrode; iron perchlorate; carbon fiber; Thiele modulus
资金
- National Research Foundation of Korea [NRF-2017R1A2B4004022, NRF-2017M3A9E2063256]
- [NRF-2017K1A4A3013662]
- National Research Foundation of Korea [2017M3A9E2063256] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Carbon-based porous electrodes have led to remarkable improvements in the performance of thermochemical cells or thermocells that electrochemically harvest low-grade waste thermal energy. However, the output current from the thermocells is hampered by the diffusion effect, which leads to depleted ion concentration as the ions permeate through the porous electrode. Here, we advance a theoretical basis for a quantitative description of the diffusion effect on current generation in such porous electrodes. One single dimensionless parameter of Thiele modulus describes the effect according to the theory adopted from the well-established results in the literature. Experimental results for carbon fiber electrodes are illustrated and quantified by the theory. The theory presented here would provide a basis for the choice and design of porous electrodes for thermocells. The results should also provide a basis for devising electrochemical devices with highly porous electrodes.
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