article published yes Bingfei Nan author Mengyao Li author Yu Zhang author Ke Xiao author Khak Ho Lim author Cheng Chang author 9E331C2E-9F27-11E9-AE48-5033E66974250000-0002-9515-4277 Xu Han author Yong Zuo author Junshan Li author Jordi Arbiol author Jordi Llorca author Maria Ibáñez author 43C61214-F248-11E8-B48F-1D18A9856A870000-0001-5013-2843 Andreu Cabot author MaIb department Bottom-up Engineering for Thermoelectric Applications project HighTE: The Werner Siemens Laboratory for the High Throughput Discovery of Semiconductors for Waste Heat Recovery project The direct, solid state, and reversible conversion between heat and electricity using thermoelectric devices finds numerous potential uses, especially around room temperature. However, the relatively high material processing cost limits their real applications. Silver selenide (Ag2Se) is one of the very few n-type thermoelectric (TE) materials for room-temperature applications. Herein, we report a room temperature, fast, and aqueous-phase synthesis approach to produce Ag2Se, which can be extended to other metal chalcogenides. These materials reach TE figures of merit (zT) of up to 0.76 at 380 K. To improve these values, bismuth sulfide (Bi2S3) particles also prepared in an aqueous solution are incorporated into the Ag2Se matrix. In this way, a series of Ag2Se/Bi2S3 composites with Bi2S3 wt % of 0.5, 1.0, and 1.5 are prepared by solution blending and hot-press sintering. The presence of Bi2S3 significantly improves the Seebeck coefficient and power factor while at the same time decreasing the thermal conductivity with no apparent drop in electrical conductivity. Thus, a maximum zT value of 0.96 is achieved in the composites with 1.0 wt % Bi2S3 at 370 K. Furthermore, a high average zT value (zTave) of 0.93 in the 300–390 K range is demonstrated. https://research-explorer.ista.ac.at/download/13093/17250/2024_ACSAppElecMaterials_Nan.pdf application/pdfno American Chemical Society2024 eng 2637-6113 38828037 00098685900000110.1021/acsaelm.3c00055 652807-215 Nan, Bingfei, et al. “Engineering of Thermoelectric Composites Based on Silver Selenide in Aqueous Solution and Ambient Temperature.” <i>ACS Applied Electronic Materials</i>, vol. 6, no. 5, American Chemical Society, 2024, pp. 2807–215, doi:<a href="https://doi.org/10.1021/acsaelm.3c00055">10.1021/acsaelm.3c00055</a>. B. Nan, M. Li, Y. Zhang, K. Xiao, K.H. Lim, C. Chang, X. Han, Y. Zuo, J. Li, J. Arbiol, J. Llorca, M. Ibáñez, A. Cabot, ACS Applied Electronic Materials 6 (2024) 2807–215. Nan, B., Li, M., Zhang, Y., Xiao, K., Lim, K. H., Chang, C., … Cabot, A. (2024). Engineering of thermoelectric composites based on silver selenide in aqueous solution and ambient temperature. <i>ACS Applied Electronic Materials</i>. American Chemical Society. <a href="https://doi.org/10.1021/acsaelm.3c00055">https://doi.org/10.1021/acsaelm.3c00055</a> Nan B, Li M, Zhang Y, et al. Engineering of thermoelectric composites based on silver selenide in aqueous solution and ambient temperature. <i>ACS Applied Electronic Materials</i>. 2024;6(5):2807-215. doi:<a href="https://doi.org/10.1021/acsaelm.3c00055">10.1021/acsaelm.3c00055</a> Nan B, Li M, Zhang Y, Xiao K, Lim KH, Chang C, Han X, Zuo Y, Li J, Arbiol J, Llorca J, Ibáñez M, Cabot A. 2024. Engineering of thermoelectric composites based on silver selenide in aqueous solution and ambient temperature. ACS Applied Electronic Materials. 6(5), 2807–215. B. Nan <i>et al.</i>, “Engineering of thermoelectric composites based on silver selenide in aqueous solution and ambient temperature,” <i>ACS Applied Electronic Materials</i>, vol. 6, no. 5. American Chemical Society, pp. 2807–215, 2024. Nan, Bingfei, Mengyao Li, Yu Zhang, Ke Xiao, Khak Ho Lim, Cheng Chang, Xu Han, et al. “Engineering of Thermoelectric Composites Based on Silver Selenide in Aqueous Solution and Ambient Temperature.” <i>ACS Applied Electronic Materials</i>. American Chemical Society, 2024. <a href="https://doi.org/10.1021/acsaelm.3c00055">https://doi.org/10.1021/acsaelm.3c00055</a>. 130932023-05-28T22:01:03Z2025-04-14T09:29:33Z