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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二元熔盐法制备聚七嗪亚胺光阳极的优化研究

用于水氧化反应的聚合物基光阳极最近引起了人们的关注，氮化碳因其众多优点而脱颖而出。本研究的重点是合成晶体氮化碳光阳极，特别是聚七嗪亚胺（PHI），并探讨了盐在其生产中的作用。采用二元熔盐体系，在AM 1.5G照明下，相对于可逆氢电极，在1.23 V的电压偏置下获得了365 μA·cm−2的最佳光电流密度，是原始PCN光阳极的18倍左右。在此过程中，NH₄SCN有利于SnS2种子层的生长，而K2CO3则提高了薄膜的结晶度。原位电化学分析表明，这种盐组合提高了光激发电荷转移效率，并使SnS2层中的电阻最小化。本研究阐明了盐在PHI光阳极合成中的作用，为设计高结晶度氮化碳基功能薄膜提供了思路。下载：下载高清图片（164KB）下载：下载全尺寸图片

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