Chinese Journal of Catalysis ›› 2025, Vol. 73: 289-299.DOI: 10.1016/S1872-2067(25)64703-6

• Article • Previous Articles     Next Articles

CO2-free hydrogen production from solar-driven photothermal catalytic decomposition of methane

Yihan Zhenga,c,1, Yuxin Wanga,c,1, Ruitao Lia,c, Haoran Yanga,c, Yuanyuan Daie, Qiang Niue, Tiejun Lina,b,c, Kun Gonga,e(), Liangshu Zhonga,b,c,d()   

  1. aCAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    bState Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    cUniversity of Chinese Academy of Sciences, Beijing 100049, China
    dSchool of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
    eNational Enterprise Technology Center,Inner Mongolia Erdos Electric Power and Metallurgy Group Co., Ltd. Ordos, Erdos 016064, Inner Mongolia, China
  • Received:2025-02-19 Accepted:2025-04-07 Online:2025-06-18 Published:2025-06-12
  • Contact: *E-mail: gongkun@sari.ac.cn (K. Gong),zhongls@sari.ac.cn (L. Zhong).
  • About author:1 These authors contributed equally to this work.
  • Supported by:
    National Key R&D Program of China(2021YFF0500702);Natural Science Foundation of Shanghai(22JC1404200);Program of Shanghai Academic/Technology Research Leader(20XD1404000);Natural Science Foundation of China(U22B20136);Natural Science Foundation of China(22293023);Science and Technology Major Project of Inner Mongolia(2021ZD0042);Youth Innovation Promotion Association of CAS

Abstract:

CO2-free H2 refers to H2 production process without CO2 emission, which is a promising clean energy in the future. Catalytic decomposition of methane (CDM) is a competitive technology to produce CO2-free H2 with large-scale. However, CDM reaction is highly endothermic and is kinetically and thermodynamically unfavorable, which typically requires a harsh reaction temperature above 800 °C. In this work, solar-driven photothermal catalytic decomposition of methane was firstly introduced to produce CO2-free H2 relying solely on solar energy as the driving force. A high H2 yield of 204.6 mmol g-1 h-1 was observed over Ni-CeO2 interface under photothermal conditions, along with above 87% reduction in the apparent activation energy (11.2 vs. 87.3 kJ mol-1) when comparing with the traditional thermal catalysis. Further studies suggested that Ni/CeO2 catalyst enhanced optical absorption in visible-infrared region to ensure the heat energy for methane decomposition. The generated electrons and holes participated in the redox process of photo-driven CDM reaction with enhanced separation ability of hot carriers excited by ultraviolet-visible light, which lowered activation energy and improved the photothermal catalytic activity. This work provides a promising photothermal catalytic strategy to produce CO2-free H2 under mild conditions.

Key words: CO2-free hydrogen, Hydrogen production, Photothermal catalysis, Methane decomposition, Methane conversion