Enhancement of Thermoelectric Properties in Cold Pressed Nickel Doped Bismuth Sulfide Compounds

Fitriani, Fitriani and Said, Suhana Mohd and Rozali, Shaifulazuar and Salleh, Faiz and Sabri, Mohd Faizul Mohd and Bui, Duc Long and Nakayama, Tadachika and Raihan, Ovik and Megat Hasnan, Megat Muhammad Ikhsan and Bashir, Mohamed Bashir Ali and Kamal, Farhan (2018) Enhancement of Thermoelectric Properties in Cold Pressed Nickel Doped Bismuth Sulfide Compounds. Electronic Materials Letters, 14 (6). pp. 689-699. ISSN 1738-8090, DOI https://doi.org/10.1007/s13391-018-0072-8.

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Official URL: https://doi.org/10.1007/s13391-018-0072-8


Abstract: Nanostructured Ni doped Bi2S3 (Bi2−xNixS3, 0 ≤ x ≤ 0.07) is explored as a candidate for telluride free thermoelectric material, through a combination process of mechanical alloying with subsequent consolidation by cold pressing followed with a sintering process. The cold pressing method was found to impact the thermoelectric properties in two ways: (1) introduction of the dopant atom in the interstitial sites of the crystal lattice which results in an increase in carrier concentration, and (2) introduction of a porous structure which reduces the thermal conductivity. The electrical resistivity of Bi2S3 was decreased by adding Ni atoms, which shows a minimum value of 2.35 × 10−3 Ω m at 300 °C for Bi1.99Ni0.01S3 sample. The presence of porous structures gives a significant effect on reduction of thermal conductivity, by a reduction of ~ 59.6% compared to a high density Bi2S3. The thermal conductivity of Bi2−xNixS3 ranges from 0.31 to 0.52 W/m K in the temperature range of 27 °C (RT) to 300 °C with the lowest κ values of Bi2S3 compared to the previous works. A maximum ZT value of 0.13 at 300 °C was achieved for Bi1.99Ni0.01S3 sample, which is about 2.6 times higher than (0.05) of Bi2S3 sample. This work show an optimization pathway to improve thermoelectric performance of Bi2S3 through Ni doping and introduction of porosity. Graphical Abstract: [Figure not available: see fulltext.].

Item Type: Article
Funders: University of Malaya through University Malaya Research Grant (UMRG) under the project RP032A-15AET, Post-graduate Research Grants (PPP) under the project PG136/2015A, Fundamental Research Grant Scheme (Grant No. FP064-2016)
Uncontrolled Keywords: Bi2S3; Cold pressing; Nickel doping; Porosity; Thermoelectric properties
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 26 Aug 2019 05:39
Last Modified: 26 Aug 2019 05:39
URI: http://eprints.um.edu.my/id/eprint/22072

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