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

IF 10.8 2区化学 Q1 CHEMISTRY, PHYSICAL 物理化学学报 Pub Date : 2024-12-01 DOI:10.3866/PKU.WHXB202408012

Jiaxin Su , Jiaqi Zhang , Shuming Chai , Yankun Wang , Sibo Wang , Yuanxing Fang

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Abstract

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.

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