Highly stable n-hexacosane loaded exfoliated graphite nanosheets for enhanced thermal energy storage application

Paneliya, Sagar; Khanna, Sakshum; Utsav,; Makani, Nisha Hiralal; Banerjee, Rupak; Mukhopadhyay, Indrajit

doi:10.1016/j.est.2021.103903

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…The main reason was that the N-Fe/BC contained not only stable highly aromatic carbon components but also Fe 3 C components to improve the mechanical strength, thus improving the thermal stability . Moreover, the refractory carbon structure (high graphitization degree) with high thermal stability was more likely to be generated under high temperatures for a period, resulting in high thermal stability . Therefore, compared with N-Fe/BC-E prepared by electric heating, N-Fe/BC prepared by microwaves had a better thermal stability.…”

Section: Resultsmentioning

confidence: 99%

Microwave-Induced One-Pot Preparation of Bifunctional N-Fe/BC Catalysts and Oriented Production of Phenol-Enriched Bio-Oil from Biomass Pyrolysis: Catalyst Synthesis, Performance Evaluation, and Mechanism Insight via Theoretical Calculations

et al. 2022

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To recover valuable products from biomass, bifunctional catalysts (N-Fe/BC) capable of microwave absorption and oriented production of phenolics were prepared by a one-pot method involving the microwave-induced K2FeO4. Its catalytic performances were evaluated, and the catalytic mechanism was explored using a model compound and DFT calculations. The cycle performance and deactivation mechanism were investigated. N-Fe/BC possessed a large S BET value (265.21 m2 g–1), good pore distribution, and abundant Fe and N species, resulting in good dielectric and catalytic properties. After catalysis, the heating rates reached 63.78–107.84 °C min–1, and the selectivity and yield of phenol-enriched bio-oil improved significantly, reaching maximum values of 80.28% and 38.09 wt % at 550 °C with 20 wt % N-Fe/BC, respectively. Model compound experiments and DFT calculations showed that N-Fe/BC directionally generated phenolics by changing the reaction path and forming “hot spots” that stimulated the catalytic reforming of oxygen-containing compounds. The catalytic performance decreased slightly after five cycles, due to active site loss, carbon deposition, and pore collapse.

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Section: Resultsmentioning

confidence: 99%

Microwave-Induced One-Pot Preparation of Bifunctional N-Fe/BC Catalysts and Oriented Production of Phenol-Enriched Bio-Oil from Biomass Pyrolysis: Catalyst Synthesis, Performance Evaluation, and Mechanism Insight via Theoretical Calculations

et al. 2022

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“…To improve the thermal conductivity, the introduction of highly thermally conductive carbon-based materials, such as expanded graphite (EG) [39][40][41], graphite/graphene nanosheets [42][43][44], graphene oxide [45,46], and carbon nanotubes [47,48], into PCMs to form effective heat transfer channels in the composites is the most convenient and commonly used method. In addition, fillers, such as boron nitride [49], metal nanoparticles [50], etc., are also included.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Thermal Properties of Propyl Palmitate-Based Phase Change Composites with Enhanced Thermal Conductivity for Thermal Energy Storage

2023

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Phase change materials (PCMs), which can absorb and release large amounts of latent heat during phase change, have been extensively studied for heat storage and thermal management. However, technical bottlenecks regarding low thermal conductivity and leakage have hindered practical applications of PCMs. In this paper, a simple, economical, and scalable absorption polymerization technique is proposed to prepare the polymethyl methacrylate/propyl palmitate/expanded graphite (MPCM/EG) phase change composites by constructing the microencapsulated phase change materials (polymethyl methacrylate/propyl palmitate, MPCM) with core-shell structures in the three-dimensional (3D) EG networks, taking propyl palmitate as the PCM core, polymethyl methacrylate (PMMA) as the shell, and long-chain “worm-like” EG as the thermally conductive networks. This technique proved to be a more appropriate combinatorial pathway than direct absorption of MPCM via EG. The MPCM/EG composites with high thermal conductivity, high enthalpy, excellent thermal stability, low leakage, and good thermal cycle reliability were prepared. The results showed that the MPCM-80/EG-10 composite demonstrated a high thermal conductivity of 3.38 W/(m·K), a phase change enthalpy up to 152.0 J/g, an encapsulation ratio of 90.3%, outstanding thermal stability performance, and long-term thermal cycle reliability when the EG loading is 10% and propyl palmitate is 80%. This research offers an easy and efficient approach for designing and fabricating phase change composites with promising applications in diverse energy-saving fields, such as renewable energy collection, building energy conservation, and microelectronic devices thermal protection.

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“…PCM has drawn lot of attention for their advantages. Sakshum et al [19] . studied n‐hexacosane as phase change material.…”

Section: Introductionmentioning

confidence: 99%

“…PCM has drawn lot of attention for their advantages. Sakshum et al [19] studied n-hexacosane as phase change material. The results show that the phase transition temperature of n-hexacosane is 54.6 °C, and the latent heat of phase transition is 184.6 J/g.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Properties of Myristic Acid‐Stearic Acid Based Ternary Composite Phase Change Materials for Thermal Energy Storage

et al. 2022

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In this work, melt blending method was used to prepare two composite phase change materials of myristic acid-stearic acid (MS) and myristic acid-stearic acid-lauric acid (MSL). The optimum mass ratios of MS and MSL were 77 : 23 and 28 : 9 : 63 by step cooling curve assay, respectively. The phase transition temperature of MS and MSL were 47.13 °C and 28.81 °C by differential scanning calorimetry (DSC), and the latent heat of phase transition of MS and MSL were also measured to be 153.3 J/g and 143.3 J/g, respectively. On the other hand, the phase transition temperature of MSL had little change after 300 cycles, indicating that it had good stability. In addition, the structure characteristics of MSL was found to be the same as that of pure material by FTIR, which indicates that materials are interacted by molecular force. Therefore, MSL can be used in construction and has a good application prospect.

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Highly stable n-hexacosane loaded exfoliated graphite nanosheets for enhanced thermal energy storage application

Cited by 9 publications

References 39 publications

Microwave-Induced One-Pot Preparation of Bifunctional N-Fe/BC Catalysts and Oriented Production of Phenol-Enriched Bio-Oil from Biomass Pyrolysis: Catalyst Synthesis, Performance Evaluation, and Mechanism Insight via Theoretical Calculations

Microwave-Induced One-Pot Preparation of Bifunctional N-Fe/BC Catalysts and Oriented Production of Phenol-Enriched Bio-Oil from Biomass Pyrolysis: Catalyst Synthesis, Performance Evaluation, and Mechanism Insight via Theoretical Calculations

Preparation and Thermal Properties of Propyl Palmitate-Based Phase Change Composites with Enhanced Thermal Conductivity for Thermal Energy Storage

Characteristics and Properties of Myristic Acid‐Stearic Acid Based Ternary Composite Phase Change Materials for Thermal Energy Storage

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