Recent Advances in Polyaniline-Based Thermoelectric Composites

Liu, Siqi; Li, Hui; Li, Pengcheng; Liu, Yalong; He, Chaobin

doi:10.31635/ccschem.021.202101066

Cited by 35 publications

(17 citation statements)

References 81 publications

(101 reference statements)

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“…Acid doping is a simple and effective approach to endowing PANI with electrical conductivity. Small inorganic acids, such as HCl and H 2 SO 4 , are widely used as a dopant of PANI. − However, these small molecule dopants can gradually evaporate, decreasing the electrical conductivity of PANI. − The polymeric acid (polyacid) dopants can overcome these issues.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Firda

Jeon

2022

ACS Appl. Polym. Mater.

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Owing to its unique structure and reduction–oxidation (redox) properties, polyaniline (PANI) has been widely used in diverse applications, including sensors, solar cells, electrochromic devices, batteries, and supercapacitors. However, irreversible redox reactions between different oxidation states of PANI often result in low chemical and electrochemical stability, deteriorating devices’ performance characteristics. Herein, we fabricated PANI-based multilayer films using spin-assisted layer-by-layer assembly, providing significantly improved chemical and electrochemical stability compared to the PANI homopolymer. More importantly, we found that the electroactivity and electrical conductivity of PANI-based films can be restored by a simple chemical reactivation process using an acidic aqueous solution. The re-doping process successfully recovers the electrochemical properties of PANI, even improving the electroactivity and conductivity characteristics of polyacid-doped PANI films, attributed to the secondary doping and rearrangement of polymers. Furthermore, we demonstrate that the performance of PANI multilayer films for ammonia sensors is successfully restored after the reactivation process.

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Section: Introductionmentioning

confidence: 99%

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Firda

Jeon

2022

ACS Appl. Polym. Mater.

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“…Generally, the σ of PANI is improved with increasing doping level to a certain extent, while S deteriorates owing to increased carrier concentration. Thereby, the maximum PF of PANI was achieved with a doping level of around 50%, which is commonly adopted to fabricate PANI-based composites [ 41 ]. Wang et al prepared PANI/SWCNTs composite films using solvent treatment in combination with in-situ polymerization [ 90 ].…”

Section: Preparation Engineeringmentioning

confidence: 99%

“…To date, versatile PANI-based composites have been developed with the incorporation of nanomaterials that possess high σ or S . A variety of nanomaterials, such as carbon nanomaterials, inorganic TE materials, and other conductive polymers, have been widely studied and summarized as effective fillers to develop PANI-based composites with enhanced TE properties [ 41 , 42 , 43 ]. Due to extremely high electrical and mechanical behaviors, carbon nanotubes (CNTs) have attracted significant interest in polymer-based composites [ 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Advancement of Polyaniline/Carbon Nanotubes Based Thermoelectric Composites

Zhang

Liu

et al. 2022

Materials

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Organic thermoelectric (TE) materials have been widely investigated due to their good stability, easy synthesis, and high electrical conductivity. Among them, polyaniline/carbon nanotubes (PANI/CNTs) composites have attracted significant attention for pursuing enhanced TE properties to meet the demands of commercial applications. In this review, we summarize recent advances in versatile PANI/CNTs composites in terms of the dispersion methods of CNTs (such as the addition of surfactants, mechanical grinding, and CNT functional group modification methods), fabrication engineering (physical blending and in-situ polymerization), post-treatments (solvent treatments to regulate the doping level and microstructure of PANI), and multi-components composites (incorporation of other components to enhance energy filtering effect and Seebeck coefficient), respectively. Various approaches are comprehensively discussed to illustrate the microstructure modulation and conduction mechanism within PANI/CNTs composites. Furthermore, we briefly give an outlook on the challenges of the PANI/CNTs composites for achieving high performance and hope to pave a way for future development of high-performance PANI/CNTs composites for sustainable energy utilization.

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“…For instance, the thermoelectric performance of organic polymers can be significantly improved by controlling the combination of carbon nanotubes (CNTs) or graphene nanosheets with such polymers [ 1 , 2 , 3 ]. So far, the most common conducting polymers that have been investigated as thermoelectric materials are polyaniline (PANI) [ 4 ], polypyrrole (PPy) [ 5 ], and poly (3,4-ethylene dioxythiophene) (PEDOT) [ 6 , 7 , 8 ]. However, the TE performance was limited because of the low electrical conductivity of the used carbon nanostructures or due to the low interaction between the conducting polymer and carbon material [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

High Thermoelectric Power Generation by SWCNT/PPy Core Shell Nanocomposites

et al. 2022

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Polypyrrole (PPy) is a conducting polymer with attractive thermoelectric (TE) properties. It is simple to fabricate and modify its morphology for enhanced electrical conductivity. However, such improvement is still limited to considerably enhancing TE performance. In this case, a single-wall carbon nanotube (SWCNT), which has ultrathin diameters and exhibits semi-metallic electrical conductivity, might be a proper candidate to be combined with PPy as a core shell one-dimensional (1D) nanocomposite for higher TE power generation. In this work, core shell nanocomposites based on SWCNT/PPy were fabricated. Various amounts of pyrrole (Py), which are monomer sources for PPy, were coated on SWCNT, along with methyl orange (MO) as a surfactant and ferric chloride as an initiator. The optimum value of Py for maximum TE performance was determined. The results showed that the SWCNT acted as a core template to direct the self-assembly of PPy and also to further enhance TE performance. The TE power factor, PF, and figure of merit, zT, values of the pure PPy were initially recorded as ~1 µW/mK2 and 0.0011, respectively. These values were greatly increased to 360 µW/mK2 and 0.09 for the optimized core shell nanocomposite sample. The TE power generation characteristics of the fabricated single-leg module of the optimized sample were also investigated and confirmed these findings. This enhancement was attributed to the uniform coating and good interaction between PPy polymer chains and walls of the SWCNT through π–π stacking. The significant enhancement in the TE performance of SWCNT/PPy nanocomposite is found to be superior compared to those reported in similar composites, which indicates that this nanocomposite is a suitable and scalable TE material for TE power generation.

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Recent Advances in Polyaniline-Based Thermoelectric Composites

Cited by 35 publications

References 81 publications

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Advancement of Polyaniline/Carbon Nanotubes Based Thermoelectric Composites

High Thermoelectric Power Generation by SWCNT/PPy Core Shell Nanocomposites

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