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<p>The use of renewable energy sources is attracting more and more attention with the global development. Solar thermochemical fuel production is a key approach of utilizing renewable energy, and the design of multi-generation systems using this method has emerged as an important research direction. Most of the currently proposed systems using thermochemical cycles rely on multi-step thermochemical cycles, which involve acidic substances that can corrode system pipelines and components, making them challenging to implement. Current studies focus on simulation investigations, lacking experimental validation with prototype models. Drawing from experimental results, this study proposes a novel multi-generation system using a two-step Ce-based solar thermochemical cycle, which avoids the production of acidic substances, achieves negative carbon emissions, and alleviates heat losses during reaction temperature swings. The proposed system demonstrates superior performance with energy and exergy efficiencies of 74.2% and 21.4% respectively. Furthermore, variable condition analysis results confirm the system’s ability to maintain near-peak efficiencies across a wide range of operating parameters, providing valuable insights for the practical application of thermochemical cycles in real-world systems and advancing the field of renewable energy utilization.</p>

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A Novel Two-Step Solar Thermochemical Cycle System Generating CO, Electricity and Heat with Negative-Carbon Emission

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Yibiao Long,
  • Kai Liu,
  • Qing Yin,
  • Shiying Yang,
  • Yixin Weng,
  • Qibin Liu

摘要

The use of renewable energy sources is attracting more and more attention with the global development. Solar thermochemical fuel production is a key approach of utilizing renewable energy, and the design of multi-generation systems using this method has emerged as an important research direction. Most of the currently proposed systems using thermochemical cycles rely on multi-step thermochemical cycles, which involve acidic substances that can corrode system pipelines and components, making them challenging to implement. Current studies focus on simulation investigations, lacking experimental validation with prototype models. Drawing from experimental results, this study proposes a novel multi-generation system using a two-step Ce-based solar thermochemical cycle, which avoids the production of acidic substances, achieves negative carbon emissions, and alleviates heat losses during reaction temperature swings. The proposed system demonstrates superior performance with energy and exergy efficiencies of 74.2% and 21.4% respectively. Furthermore, variable condition analysis results confirm the system’s ability to maintain near-peak efficiencies across a wide range of operating parameters, providing valuable insights for the practical application of thermochemical cycles in real-world systems and advancing the field of renewable energy utilization.