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<p>Lignite has emerged as a critical material in contemporary energy portfolios, particularly in electricity generation. However, this work explores lignite’s potential beyond conventional uses, exploring on its energy conversion applications. In a pioneering move, lignite samples have been directly utilized as materials for photothermal conversion applications, along with a description of their geochemical features, such as sulfur compositions, forms, and microscopic characteristics. Among the twenty lignite samples that were geologically studied, two sulfur-rich samples (CS-1 and CS-2) were chosen to explore their photothermal conversion performance. The powder-XRD diffraction patterns of CS-1 and CS-2 reveal the presence of the hexagonal phase of carbon C<sub>1</sub> with kaolinite (Al<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>(OH)<sub>4</sub>). Their XPS spectra indicate that both organic and metal-bonded sulfide moieties are present in the lignite samples. CS-1 and CS-2 were implemented under 1 Sun irradiation, and it was found that CS-2 exhibits superior light-absorbing properties, resulting in enhanced water evaporation rates. In addition, the photothermal imaging also shows a temperature increase to 58.2&#xa0;°C within 10&#xa0;min for lignite-coated membranes, compared to 31&#xa0;°C for the blank under similar conditions. These findings can be leveraged to explore lignite’s untapped potential in various technological domains, propelling the global transition towards cleaner energy solutions.</p>

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Photothermal conversion and geochemical characterization of sulfur-rich lignite for non-conventional energy applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月26日

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  • P. Gopinathan,
  • Afaq Ahmad Khan,
  • Vivek Singh,
  • M. S. Santosh,
  • T. Subramani,
  • Amit Karmakar,
  • Surender Kumar,
  • Md Asif,
  • Om Prakash Kumar,
  • Amiya S. Naik,
  • Pradip K. Banerjee,
  • Prakash K. Sarangi

摘要

Lignite has emerged as a critical material in contemporary energy portfolios, particularly in electricity generation. However, this work explores lignite’s potential beyond conventional uses, exploring on its energy conversion applications. In a pioneering move, lignite samples have been directly utilized as materials for photothermal conversion applications, along with a description of their geochemical features, such as sulfur compositions, forms, and microscopic characteristics. Among the twenty lignite samples that were geologically studied, two sulfur-rich samples (CS-1 and CS-2) were chosen to explore their photothermal conversion performance. The powder-XRD diffraction patterns of CS-1 and CS-2 reveal the presence of the hexagonal phase of carbon C1 with kaolinite (Al2Si2O5(OH)4). Their XPS spectra indicate that both organic and metal-bonded sulfide moieties are present in the lignite samples. CS-1 and CS-2 were implemented under 1 Sun irradiation, and it was found that CS-2 exhibits superior light-absorbing properties, resulting in enhanced water evaporation rates. In addition, the photothermal imaging also shows a temperature increase to 58.2 °C within 10 min for lignite-coated membranes, compared to 31 °C for the blank under similar conditions. These findings can be leveraged to explore lignite’s untapped potential in various technological domains, propelling the global transition towards cleaner energy solutions.