Citation: Jiaxin Su, Jiaqi Zhang, Shuming Chai, Yankun Wang, Sibo Wang, Yuanxing Fang. Optimizing Poly(heptazine imide) Photoanodes Using Binary Molten Salt Synthesis for Water Oxidation Reaction[J]. Acta Physico-Chimica Sinica, ;2024, 40(12): 240801. doi: 10.3866/PKU.WHXB202408012 shu

Optimizing Poly(heptazine imide) Photoanodes Using Binary Molten Salt Synthesis for Water Oxidation Reaction

Jiaxin Su ¹ ,
Jiaqi Zhang ¹ ,
Shuming Chai ¹ ,
Yankun Wang ¹ ,
Sibo Wang ^{1, 2,,} ,
Yuanxing Fang ^{1, 2,,}

1.
State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, China
2.
Sino-UK International Joint Laboratory on photocatalysis for Clean Energy and Advanced Chemicals & Materials, Fuzhou University, Fuzhou 350108, China

Corresponding author: Sibo Wang, sibowang@fzu.edu.cn Yuanxing Fang, yxfang@fzu.edu.cn
Received Date: 20 August 2024
Revised Date: 19 September 2024
Accepted Date: 19 September 2024
Available Online: 17 October 2024
Fund Project: the National Key R&D Program of China 2022YFE0114800the National Key R&D Program of China 2021YFA1502100National Natural Science Foundation of China 22075047National Natural Science Foundation of China 22032002National Natural Science Foundation of China U1905214National Natural Science Foundation of China 21961142019the 111 Project (D16008) D16008

Polymer-based photoanodes for the water oxidation reaction have recently garnered attention, with carbon nitride standing out due to its numerous advantages. This study focuses on synthesizing crystalline carbon nitride photoanodes, specifically poly(heptazine imide) (PHI), and explores the role of salts in their production. Using a binary molten salt system, optimal photocurrent density of 365 μA·cm⁻² was achieved with a voltage bias of 1.23 V versus the reversible hydrogen electrode under AM 1.5G illumination, this performance is ca. 18 times to the pristine PCN photoanode. In this process, NH₄SCN facilitates the growth of SnS₂ seeding layers, while K₂CO₃ enhances film crystallinity. In situ electrochemical analyses show that this salt combination improves photoexcited charge transfer efficiency and minimizes resistance in the SnS₂ layer. This study clarifies the role of salts in synthesizing the PHI photoanode and provides insights for designing high-crystallinity carbon nitride-based functional films.
- Binary salts,
- Poly-heptazine-imide,
- Ionothermal synthesis,
- Water oxidation,
- Photoanode
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