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Enhancing the optical properties of La0.5Sr0.5CoO3-δ by surface reconstruction for high-temperature solar thermal conversion

Author

Listed:
  • Sun, Peng
  • Xie, Zhuolin
  • Song, Yanqi
  • Lin, Ziqin
  • Liu, Qikai
  • Dai, Anqi
  • Fang, Zhenggang
  • Lu, Chunhua

Abstract

An innovative surface reconstruction strategy was developed for spectral selective absorption ceramic La0.5Sr0.5CoO3-δ (LSC5) through ultrasonic assisted KBH4 solution reduction treatment and high-temperature annealing to improve solar-thermal conversion performance. This strategy yielded a densely distributed nanostructure surface composed of LaxSryCoO3-δ (0.5 < x < 1.0, 0 < y < 0.5) and segregated Co3O4, which boosted solar absorptance of LSC5 to 0.827 (vs. 0.630 for pristine sample) while maintaining low infrared emittance (0.225). The surface-reconstructed LSC5 exhibited outstanding thermal durability, retaining stable optical properties after 10 cyclic heat treatments (9 h each cycle) at 800 °C in air. Under 10.1 W cm−2 concentrated solar irradiation, the surface-reconstructed LSC5 achieved an equilibrium temperature of 947 °C, surpassing that of commercial SiC (724 °C). This solution-based surface reconstruction method offers a novel pathway for developing high-efficient, air-stable solar-thermal absorbers.

Suggested Citation

  • Sun, Peng & Xie, Zhuolin & Song, Yanqi & Lin, Ziqin & Liu, Qikai & Dai, Anqi & Fang, Zhenggang & Lu, Chunhua, 2026. "Enhancing the optical properties of La0.5Sr0.5CoO3-δ by surface reconstruction for high-temperature solar thermal conversion," Energy, Elsevier, vol. 357(C).
    • Handle: RePEc:eee:energy:v:357:y:2026:i:c:s0360544226014490
    DOI: 10.1016/j.energy.2026.141343
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