Drawbacks of low efficiency and high cost of the electrode materials have restricted the wide applications of the thermo-electrochemical cells (TECs). Due to high specific areas and electrical conductivities, the low cost multi-walled carbon nanotubes (MWNTs) are promising alternative electrode materials. In this work, the MWNT films of up to 16 cm2 were synthesized on stainless steel substrates by the electrophoretic deposition (EPD) to make the thermo-electrochemical electrodes. MWNT electrodes based on TECs were characterized by cyclic voltammetry and the long-term stability tests with the potassium ferri/ferrocyanide electrolyte. The TECs reached the current density of 45.2 A m−2 and the maximum power density of 0.82 W m−2. The relative power conversion efficiency of the MWNT electrode is 50 % higher than that for the Pt electrode. Meanwhile, the TECs was operated continuously for 300 h without performance degradation. With the priorities of low cost and simple fabrication, EPD-based MWNT TECs may become commercially viable.Electronic supplementary materialThe online version of this article (doi:10.1007/s40820-016-0082-8) contains supplementary material, which is available to authorized users.
展开▼
机译:电极材料的低效率和高成本的缺点限制了热电化学电池(TEC)的广泛应用。由于高的比表面积和电导率,低成本的多壁碳纳米管(MWNT)是有前途的替代电极材料。在这项工作中,通过电泳沉积(EPD)在不锈钢基板上合成了高达16cm 2 sup>的MWNT膜,制成了热电化学电极。通过循环伏安法和亚铁酸钾/亚铁氰化钾电解质的长期稳定性测试,对基于TEC的MWNT电极进行了表征。 TEC的电流密度达到45.2A m −2 sup>,最大功率密度为0.82 W m -2 sup>。 MWNT电极的相对功率转换效率比Pt电极高50%。同时,TECs连续运行300小时而不会降低性能。基于低成本和简单制造的优先考虑,基于EPD的MWNT TEC可能在商业上可行。电子补充材料本文的在线版本(doi:10.1007 / s40820-016-0082-8)包含补充材料,可授权使用用户。
展开▼