N、F共掺杂SrTiO3/C3N4复合光阳极的光电化学阴极保护性能

王建省; 孔存辉; 曾雄丰; 赵英娜

N、F共掺杂SrTiO₃/C₃N₄复合光阳极的光电化学阴极保护性能

华北理工大学材料科学与工程学院, 河北省无机非金属材料实验室, 河北唐山 063210

基金项目: 唐山市科技局项目(22130215H)；河北省省属高校基本科研业务费项目(JQN2023009)

详细信息

通讯作者:
赵英娜，博士，教授，硕士生导师，研究方向为：纳米功能材料、无机非金属材料、光催化材料等　E-mail: zhyn@ncst.edu.cn

中图分类号: TB34；TB333
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- 文章访问数: 21
- HTML全文浏览量: 18
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-22
- 修回日期: 2024-08-31
- 录用日期: 2024-09-07
- 网络出版日期: 2024-09-21

Photoelectrochemical cathodic protection performance of N, F-codoped SrTiO₃/C₃N₄ composite photoanode

College of Material Science and Engineering, North China University of Science and Technology; Hebei Province Laboratory of Inorganic Nonmetallic Materials, Tangshan 063210, China

Funds: Tangshan Science and Technology Bureau project: (No. 22130215H); Fundamental Research Fund in colleges and universities of Hebei Province (JQN2023009)

摘要

摘要: 为进一步提高SrTiO₃的光响应范围并有效抑制其载流子复合的问题，本研究通过溶剂热法合成了N、F共掺杂的SrTiO₃ (N、F-SrTiO₃)，并将N、F-SrTiO₃与热缩聚法得到的C₃N₄混合并煅烧制备出了N、F-SrTiO₃/C₃N₄复合材料，研究了其在模拟海水中对304不锈钢(304 SS)光电化学阴极保护的性能和强化机制。结果表明，光照时，在模拟海水中，N、F-SrTiO₃/C₃N₄与304 SS耦连后的的光电流密度为11 μA/cm²，是SrTiO₃光电流密度(2 μA/cm²)的5.5倍；N、F-SrTiO₃/C₃N₄复合材料与304 SS耦联后开路电位为−0.52 V，比304 SS的自腐蚀电位(−0.18 V)负移了340 mV。而304 SS与SrTiO₃耦联后开路电位仅负移了220 mV。N、F-SrTiO₃/C₃N₄表现出更好的光电化学阴极保护效果的原因在于N、F共掺杂和C₃N₄复合两种改性方法协同增强了SrTiO₃光吸收，提高电子空穴对的分离率。
- SrTiO₃ /
- 共掺杂 /
- 异质结 /
- 光电化学阴极保护
Abstract: To further enhance the light response range of SrTiO₃ and effectively suppress the recombination of its charge carriers, this study synthesized N, F-codoped SrTiO₃ (N, F-SrTiO₃) using a solvothermal method. N,F-SrTiO₃ was mixed with C₃N₄ obtained by thermal polymerization and calcined to fabricate the N,F-SrTiO₃/C₃N₄ composite. The photoelectrochemical cathodic protection performance and strengthening mechanism of this composite material were investigated in simulated seawater for 304 stainless steel (304 SS). The results demonstrated that under illumination in simulated seawater, the photocurrent density of the N, F-SrTiO₃/C₃N₄ coupled with 304 SS reached 11 μA/cm², which is 5.5 times that of pure SrTiO₃ (2 μA/cm²). Additionally, the open-circuit potential of the N, F-SrTiO₃/C₃N₄ coupled with 304 SS, was −0.52 V, which shifted negatively by 340 mV compared to the self-corrosion potential of 304 SS (−0.18 V). In comparison, the open-circuit potential of 304 SS coupled with SrTiO₃ only shifted negatively by 220 mV. The superior photoelectrochemical cathodic protection properties of N, F-SrTiO₃/C₃N₄ can be attributed to the synergistic enhancement of SrTiO₃ photoabsorption and the increased electron-hole pair separation rate achieved by the codoping of N and F as well as the composite with C₃N₄.
- SrTiO₃ /
- co-doping /
- heterojunctions /
- photoelectrochemical cathodic protection^[1]

HTML全文

图 1 SrTiO₃、C₃N₄和N、F-SrTiO₃/C₃N₄复合材料的XRD图谱

Figure 1. XRD diffraction patterns of SrTiO₃、C₃N₄, and N、F-SrTiO₃/C₃N₄ composite

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图 2 N、F-SrTiO₃/C₃N₄的SEM图和相应的EDS元素分布图

Figure 2. SEM image of N、F-SrTiO₃/C₃N₄ and corresponding EDS mapping

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图 3 SrTiO₃、N、F-SrTiO₃和N、F-SrTiO₃/C₃N₄复合材料的UV-vis DRS，其中插图为Tauc图

Figure 3. UV-vis DRS diagrams of SrTiO₃, N、F-SrTiO₃, and N、F-SrTiO₃/C₃N₄ composites, inset shows Tauc spectra

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图 4 SrTiO₃和N、F-SrTiO₃/C₃N₄复合材料的PL图

Figure 4. Fluorescence spectra of SrTiO₃, and N、F-SrTiO₃/C₃N₄ composites

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图 5 SrTiO₃或N、F-SrTiO₃/C₃N₄复合材料与304 SS耦联后在0 V(versus Ag/AgCl)偏压下的光电流密度-时间曲线

Figure 5. Photocurrent density-time curves of SrTiO₃ or N、F-SrTiO₃/C₃N₄ composites coupled with 304 SS at 0 V (versus Ag/AgCl) bias

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图 6 SrTiO₃和N、F-SrTiO₃/C₃N₄复合材料与304 SS耦联后的开路电位(OCP)-时间曲线

Figure 6. Open circuit potential (OCP)l-time curves of SrTiO₃ or N、F-SrTiO₃/C₃N₄ composites coupled with 304 SS

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图 7 SrTiO₃和N、F-SrTiO₃的莫特-肖特基曲线

Figure 7. Mott-Schottky curves of SrTiO₃, and N、F-SrTiO₃

C−Capacity

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图 8 N、F-SrTiO₃/C₃N₄的光电电化学阴极保护机制图

Figure 8. Photoelectrochemical cathodic protection mechanism diagram of N、F-SrTiO₃/C₃N₄

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表 1 SrTiO₃基光阳极的光电化学阴极保护性能

Table 1. The PCP performance of SrTiO₃-based photoanodes

Photoanode	Metal^a	OCP drop /mV	Referrence
Cr-doped SrTiO₃ with H₂ treatment	304 SS	~170	[4]
SrTiO₃	CS	270	[5]
SrTiO₃/g-C₃N₄	304 SS	300	[6]
SrTiO₃/TiO₂	304 SS	270	[8]
Ni₃S₂@TiO₂/SrTiO₃	304 SS	644	[10]
SrTiO₃	304 SS	240	[17]
CeO₂/SrTiO₃	304 SS	~270	[18]
SrTiO₃/TiO₂	403 SS	~500	[19]
BaTiO₃/SrTiO₃	304 SS	230	[20]
N、F-SrTiO₃/C₃N₄	304 SS	340	This work
Notes: a SS represents stainless steel and CS represents carbon steel. OCP means open circuit potential.

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