不同浓度的NiS<sub>2</sub>-FeS<sub>2</sub>/碳纳米纤维对电极对量子点敏化太阳能电池光伏性能的影响

樊娆; 王森阳; 梁城洋; 曹颖; 耿仕通; 李玲

doi:10.13801/j.cnki.fhclxb.20230224.002

不同浓度的NiS₂-FeS₂/碳纳米纤维对电极对量子点敏化太阳能电池光伏性能的影响

doi: 10.13801/j.cnki.fhclxb.20230224.002

河北大学　物理科学与技术学院，河北省光伏技术省部共建协同创新中心，河北省光电信息材料重点实验室，保定 071002

基金项目: 国家自然科学基金(51772073)；河北省自然科学基金重点项目(E2020201030)；京津冀协同创新共同体建设专项(21344301D)；河北大学2022年大学生创新创业计划训练资助项目(2022169；2022165；2022170)

详细信息

通讯作者:
李玲，博士，教授，博士生导师，研究方向为染料(量子点)敏化太阳能电池性能的研究　E-mail: lilinghbu@163.com

中图分类号: TQ174；TB33
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出版历程
- 收稿日期: 2023-01-12
- 修回日期: 2023-02-09
- 录用日期: 2023-02-16
- 网络出版日期: 2023-02-27
- 刊出日期: 2023-12-01

Effects of NiS₂-FeS₂/carbon nanofibers counter electrodes with different concentrations on the photovoltaic performance of quantum dot sensitized solar cells

Hebei Provincial Key Laboratory of Optic-electronic Information and Materials, Hebei Provincial Photovoltaic Technology Collaborative Innovation Center, College of Physics and Technology, Hebei University, Baoding 071002, China

Funds: National Natural Science Foundation of China (51772073); Key project of Natural Science Foundation of Hebei Province (E2020201030); The Beijing-Tianjin-Hebei Collaborative Innovation Community Construction Project (21344301D); Hebei University 2022 College Students' Innovation and Entrepreneurship Plan Training Grant Project (2022169; 2022165; 2022170)

摘要

摘要: 为了弥补量子点敏化太阳能电池传统Cu₂S对电极在液态多硫化物电解液中易腐蚀、不稳定的缺陷，表现出更高的对电极电催化活性。本文通过静电纺丝技术和简单的一步水热法成功制备了碳纳米纤维负载的双金属硫化物NiS₂-FeS₂(NiS₂-FeS₂/CNFs)对电极，应用于量子点敏化太阳能电池(QDSSCs)中表现出优异的电化学性能。同时，不同浓度的NiS₂-FeS₂复合材料在SEM下表现出很大的差异，负载到碳纳米纤维制备成对电极对电池性能也有很大的影响。因此，本文重点探究了水热法制备不同浓度的NiS₂-FeS₂/CNFs对电极对其组装的QDSSCs光电性能影响，以获得最佳对电极浓度。实验结果表明：当 NiS₂-FeS₂/CNFs 浓度配比为0.8时，电池光电转换效率(PCE)达到最大值为8.05%。
- 量子点敏化太阳能电池 /
- 双金属硫化物 /
- 对电极 /
- 浓度 /
- 光电性能 /
- 碳纳米纤维
Abstract: In order to compensate for the defects of the traditional Cu₂S counter electrode in the liquid polysulfide electrolyte, it shows higher electrocatalytic activity against the electrode. In this paper, carbon nanofiber-supported bimetallic sulfide NiS₂-FeS₂ (NiS₂-FeS₂/CNFs) counter electrode has been successfully prepared by electrospinning technology and a simple one-step hydrothermal method, which shows excellent electrochemical performance when applied to quantum dot sensitized solar cells (QDSSCs). At the same time, NiS₂-FeS₂ composites with different concentrations show great differences under SEM, and the preparation of paired electrodes loaded with carbon nanofibers also has a great impact on the battery performance. Therefore, this paper focuses on exploring the effect of NiS₂-FeS₂/CNFs counter electrode with different concentrations prepared by hydrothermal method on the photoelectric performance of QDSSCs assembled by the counter electrode, so as to obtain the best counter electrode concentration. The experimental results show that when the NiS₂-FeS₂/CNFs concentration ratio is 0.8, the maximum photoelectric conversion efficiency (PCE) of the battery is 8.05%.
- quantum dot sensitized solar cell /
- bimetallic sulfidet /
- counter electrode /
- concentration /
- photoelectric performance /
- carbon nanofiber

HTML全文

图 1 纯CNFs (a) 和浓度比为0.5、0.8及1的NiS₂-FeS₂材料的SEM图像 ((b)~(d)) 及其放大图 ((e)~(g)) ；((h)~(j)) 浓度比为0.5、0.8及1的NiS₂-FeS₂材料SEM图像；((k), (l)) NiS₂-FeS₂/CNFs-0.8复合材料的TEM图像

Figure 1. SEM images of NiS₂-FeS₂ materials with pure CNFs (a) and concentration ratios of 0.5, 0.8 and 1 ((b)-(d)) and their magnification ((e)-(g)); ((h)-(j)) NiS₂-FeS₂/CNFs composites with concentration ratios of 0.5, 0.8 and 1; ((k), (l)) TEM images of NiS₂-FeS₂/CNFs-0.8

d—Lattice distance

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图 2 NiS₂-FeS₂/CNFs-0.8复合材料的元素映射图((a)~(e))和EDS图谱(f)

Figure 2. Element mapping ((a)-(e)) and EDS spectrum (f) of NiS₂-FeS₂/CNFs-0.8 composite

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图 3 不同浓度NiS₂-FeS₂/CNFs复合材料的XRD图谱

Figure 3. XRD patterns of NiS₂-FeS₂/CNFs composites with different concentrations

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图 4 不同对电极的Tafel曲线

Figure 4. Tafel polarization curves of different counter electrodes

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图 5 不同对电极的Nyquist曲线

Figure 5. Nyquist plots of different counter electrodes

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图 6 不同对电极的电流密度(J)-电压(V)曲线

Figure 6. Current density (J)-potential (V) curves of different counter electrodes

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图 7 不同浓度NiS₂-FeS₂/CNFs对电极的三电极CV曲线

Figure 7. CV curves of three electrode with different concentrations of NiS₂-FeS₂/CNFs

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图 8 (a) Cu₂S/brass对电极的3次循环伏安图；(b) NiS₂-FeS₂/CNFs对电极的10次循环伏安图

Figure 8. (a) 3-cycle voltammetry of Cu₂S/brass counter electrode; (b) 10-cycles voltammetry of NiS₂-FeS₂/CNFs counter electrode

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表 1 NiS₂-FeS₂/碳纳米纤维(CNFs)复合材料的命名

Table 1. Naming of NiS₂-FeS₂/carbon nanofiber (CNFs) composite mmol

Sample	FeCl₂·4H₂O	NiCl₂·6H₂O	Na₂S₂O₃	Urea
NiS₂-FeS₂/CNFs-1	1	1	16	0.8
NiS₂-FeS₂/CNFs-0.8	0.8	0.8	16	0.8
NiS₂-FeS₂/CNFs-0.5	0.5	0.5	16	0.8

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表 2 不同对电极的电化学阻抗(EIS)参数

Table 2. Electrochemical impedance (EIS) parameters of different counter electrodes

Counter electrode	R_s/(Ω·cm⁻²)	R_ct/(Ω·cm⁻²)	Z_N/(Ω·cm⁻²)
NiS₂-FeS₂/CNFs-1	4.05	0.10	0.05
NiS₂-FeS₂/CNFs-0.8	4.05	0.05	0.01
NiS₂-FeS₂/CNFs-0.5	4.05	0.08	0.02
Cu₂S/brass	4.06	0.13	0.06
CNFs-Ti	4.06	0.15	0.11
Notes: Cu₂S/brass—Standard Cu₂S counterelectrode; CNFs-Ti—CNFs counterelectrode based on titanium mesh; R_s—Series resistance; R_ct—Impedance of charge transfer at the electrode/electrolyte interface; Z_N—Nernst diffusion impedance.

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表 3 不同对电极在量子点敏化太阳能电池(QDSSCs)中的光伏性能参数

Table 3. Photovoltaic parameters of the quantum dot sensitized solar cells (QDSSCs) based on different counter electrodes

Counter electrode	V_oc/V	J_sc/(mA·cm⁻²)	FF	PCE/%
NiS₂-FeS₂/CNFs-1	0.66	22.10	0.52	7.39
NiS₂-FeS₂/CNFs-0.8	0.68	23.97	0.52	8.05
NiS₂-FeS₂/CNFs-0.5	0.67	23.10	0.51	7.62
Cu₂S/brass	0.64	21.85	0.50	7.03
CNFs-Ti	0.61	20.97	0.48	6.20
Notes: V_oc—Open circuit voltage; J_sc—Short circuit photocurrent densities; FF—Fill factor; PCE—Photoconversion efficiency.

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