Citation: Hanwen Jian, Kaiming Deng, Tongyu Wang, Chengxi Huang, Fang Wu, Hailing Huo, Bo Ouyang, Xuan Liu, Jingjing Ma, Erjun Kan, Ang Li. High-density triple-phase contact points for enhanced photocatalytic CO₂ reduction to methanol[J]. Chinese Chemical Letters, ;2024, 35(2): 108651. doi: 10.1016/j.cclet.2023.108651 shu

High-density triple-phase contact points for enhanced photocatalytic CO₂ reduction to methanol

Hanwen Jian ^a ,
Kaiming Deng ^a ,
Tongyu Wang ^a ,
Chengxi Huang ^a ,
Fang Wu ^b ,
Hailing Huo ^a ,
Bo Ouyang ^a ,
Xuan Liu ^a ,
Jingjing Ma ^c ,
Erjun Kan ^{a, *,} ,
Ang Li ^{a, *,}

a.
MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, School of Science, Nanjing University of Science and Technology, Nanjing 210094, China
b.
College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China
c.
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China

ekan@njust.edu.cn

liang2100@njust.edu.cn

Received Date: 13 April 2023
Revised Date: 29 May 2023
Accepted Date: 4 June 2023
Available Online: 8 June 2023

Figures(4)

The efficiency of photocatalytic CO₂ reduction reaction (PCRR) is restricted by the low solubility and mobility of CO₂ in water, poor CO₂ adsorption capacity of catalyst, and competition with hydrogen evolution reaction (HER). Recently, hydrophobic modification of the catalyst surface has been proposed as a potential solution to induce the formation of triple-phase contact points (TPCPs) of CO₂ (gas phase), H₂O (liquid phase), and catalysts (solid phase) near the surface of the catalyst, enabling direct delivery of highly concentrated CO₂ molecules to the active reaction sites, resulting in higher CO₂ and lower H⁺ surface concentrations. The TPCPs thus act as the ideal reaction points with enhanced PCRR and suppressed HER. However, the initial synthesis of triple-phase photocatalysts tends to possess a lower bulk density of TPCPs due to the simple structure leading to limited active points and CO₂ adsorption sites. Here, based on constructing a hydrophobic hierarchical porous TiO₂ (o-HPT) with interconnected macropores and mesopores structure, we have significantly increased the density of TPCPs in a unit volume of the photocatalyst. Compared with hydrophobic macroporous TiO₂ (o-MacPT) or mesoporous TiO₂ (o-MesPT), the o-HPT with increased TPCP density leads to enhanced photoactivity, enabling a high methanol production rate with 1111.5 µmol g⁻¹ h⁻¹ from PCRR. These results emphasize the significance of high-density TPCPs design and propose a potential path for developing efficient PCRR systems.
- Photocatalysis,
- CO₂ reduction reaction,
- Photocatalyst,
- Triple-phase contact points,
- Methanol
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High-density triple-phase contact points for enhanced photocatalytic CO2 reduction to methanol

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通讯作者: 陈斌, bchen63@163.com

High-density triple-phase contact points for enhanced photocatalytic CO₂ reduction to methanol