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Comment on the "Discovery of high-performance thermoelectric copper chalcogenide using modified diffusion-couple high-throughput synthesis and automated histogram analysis technique" by T. Deng, T. Xing, M. K. Brod, Y. Sheng, P. Qiu, I. Veremchuk, Q. Song, T.-R. Wei, J. Yang, G. J. Snyder, Y. Grin, L. Chen and X. Shi, Energy Environ. Sci., 2020, 13, 3041. Issue 1 (1st December 2022)
Record Type:
Journal Article
Title:
Comment on the "Discovery of high-performance thermoelectric copper chalcogenide using modified diffusion-couple high-throughput synthesis and automated histogram analysis technique" by T. Deng, T. Xing, M. K. Brod, Y. Sheng, P. Qiu, I. Veremchuk, Q. Song, T.-R. Wei, J. Yang, G. J. Snyder, Y. Grin, L. Chen and X. Shi, Energy Environ. Sci., 2020, 13, 3041. Issue 1 (1st December 2022)
Main Title:
Comment on the "Discovery of high-performance thermoelectric copper chalcogenide using modified diffusion-couple high-throughput synthesis and automated histogram analysis technique" by T. Deng, T. Xing, M. K. Brod, Y. Sheng, P. Qiu, I. Veremchuk, Q. Song, T.-R. Wei, J. Yang, G. J. Snyder, Y. Grin, L. Chen and X. Shi, Energy Environ. Sci., 2020, 13, 3041
Abstract : Structural reinvestigations of the Cu7 Sn3 S10 sample prepared in the reported conditions show that the phase of interest is not tetragonal, but crystallizes in the cubic symmetry. This imposes a re-interpretation of the thermoelectric properties in this system. Abstract : The recent paper by Deng et al. showed that a copper sulphide with Cu7 Sn3 S10 composition is a promising thermoelectric material reaching a figure of merit ZT of 0.8 at 750 K via Cl doping. However, structural reinvestigations of the Cu7 Sn3 S10 sample ( i.e., Cu2.10 Sn0.90 S3 ) prepared in the reported conditions show that the phase of interest is not tetragonal (space group I 4̄2 m, a t = 5.4164 Å, c t = 10.832 Å), but crystallizes in the cubic symmetry (space group P 4̄3 n, a c = 10.832 Å) with a composition close to Cu22 Sn10 S32 similar to the results published by Pavan Kumar et al. These observations indicate that the main phase around the composition Cu7 Sn3 S10 is cubic, and a revision needs to be imposed for the understanding of the relationships between the structure and thermoelectric properties in this family.