NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 26
·11042-11048
·
IF 3.288
Yi Yang,Qiu Zhang,Fengyan Li,Zhinan Xia,Lin Xu
This paper reports for the first time the preparation of Co3O4 nanorods by simple hydrothermal and annealing methods, which are doped with polyoxometalates that act as an intermediary in electronic transmission to accelerate electron transport. The designed H3PW12O40(PW12)/Co3O4–Cu2S composite film was prepared by the screen printing method to boost its efficiency as the counter electrode for quantum dot-sensitized solar cells, where the preparation process is simple and inexpensive. PW12/Co3O4–Cu2S (Jsc = 16.60 mA cm−2, Voc = 0.636 V, Rct = 0.32 Ω and FF = 0.436) shows better electrocatalytic performance compared to the original Co3O4 and Cu2S. Accordingly, the photoelectric conversion efficiency of PW12/Co3O4–Cu2S is 4.67%, which is 10%, 46%, 55.6%, and 72% higher than those of Co3O4–Cu2S (4.2%), Cu2S (2.54%), PW12/Co3O4 (2.07%), and Co3O4 (1.30%), respectively. Electrochemical impedance spectroscopy and Tafel measurements performed on two CE symmetric virtual cells proved the excellent electrocatalytic activity of PW12/Co3O4–Cu2S. Therefore, this composite film can be used as an alternative option for QDSSC counter electrodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 10
·1583
·
IF 2.972
Zhen Li,Libo Yu
Size controllable TiO2hollow microspheres (HMS) were synthesized by a carbonaceous spheres (CS) template method. Based on TiO2HMS, the ZnS/CdS quantum dots (QDs) were loaded to form a ZnS/CdS@TiO2HMS photoanode for quantum dots sensitized solar cell (QDSSC). The size effects of TiO2HMS on photovoltaic performance were investigated, and showed that TiO2HMS with sizes ~560 nm produced the best short-circuit current density (Jsc) of 8.02 mA cm−2and highest power conversion efficiency (PCE) of 1.83%, showing a better photovoltaic performance than any other QDSSCs based on TiO2HMS with size ~330 nm, ~400 nm, and ~700 nm. The improvement of photovoltaic performance based on ~560 nm TiO2HMS which can be ascribed to the enhanced light harvesting efficiency caused by multiple light reflection and strong light scattering of TiO2HMS. The ultraviolet-visible (UV-vis) spectra and incident photo to the current conversion efficiency (IPCE) test results confirmed that the size of TiO2HMS has an obvious effect on light harvesting efficiency. A further application of ~560 nm TiO2HMS in ZnS/PbS/CdS QDSSC can improve the PCE to 2.73%, showing that TiO2HMS has wide applicability in the design of QDSSCs.Keywords:titanium dioxide;hollow microspheres;quantum dots sensitized solar cells
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
·
2016
·
IF 2.117
Fangmin Yan,Lianfeng Duan,Qiqian Gao,Jiao Men,Shihan Sun,Xueyu Zhang,Wei Lü
In spite of the great development in quantum dot sensitized solar cells (QDSSCs), enrichment of material system of QDSSCs is still imperial mission for further advances. In this report, two-dimensional graphitic carbon nitride (g-C 3 N 4 ) prepared from urea was applied to modify porous TiO 2 photoanodes , followed by the deposition of CdS and CdSe QDs as sensitizers. In the as-prepared photoanodes, g-C 3 N 4 functioned as barrier for retarding electron backward recombination and assisted to strengthen light absorption . Compared with the pure TiO 2 photoanode, the photoelectrical behaviors of g-C 3 N 4 modified TiO 2 photoanode were obviously improved. By optimizing the loading amount of g-C 3 N 4 , the champion performance was achieved at 15% addition amount of g-C 3 N 4 with shortcircuit current density of 15.1 mA cm −2 , open circuit voltage of 0.56 V, and energy conversion efficiency of 4.14% under AM 1.5 illumination. The improvement in cell performance was attributed to the type II alignment between g-C 3 N 4 and TiO 2 , which induced the fast separation of photogenerated carriers. The transfer of the photogenerated electrons and holes is driven by the conduction band offset of 0.39 eV and the valence band offset of 0.86 eV, respectively. Present results provided a new insight for further optimum photoanode structures of QDSSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 37
·12879-12887
·
IF 4.39
Tingting Zhang,Qiu Zhang,Yumeng Wang,Fengyan Li,Lin Xu
A low cost H3PW12O40 (PW12)/CoS2 complex is prepared and used as a counter electrode (CE) to combine with sandwich quantum dot sensitized solar cells (QDSSCs) composed of a TiO2/CdS/CdSe/ZnS photoanode and polysulfide electrolyte to study their photovoltaic properties via a simple hydrothermal method. Under standard simulated sunlight, the photoelectric conversion efficiency (PCE) of 2%PW12 (PW12-2/CoS2) doped CEs was 6.29%, which was significantly 67.7% higher than those of QDSSCs based on undoped CoS2 CEs (3.75%). Due to the introduction of PW12, the nanoparticles forming the hollow structure of CoS2 changed from regular octahedra to rough nanoparticles, which increase the active sites. At the same time, the work function of CoS2 decorated with PW12 is decreased. This study and discovery demonstrate that POMs can be used to optimize CE materials and improve the photoelectric conversion efficiency of QDSSCs, which provide an experimental and theoretical basis for subsequent investigations.
研究领域:
材料科学
·
能源科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Wenhua Li,Lei He,Jing Zhang,Bin Li,Qianqiao Chen,Qin Zhong
Ternary spinel MnCo2S4 was anchored on carbon nanotubes (CNTs) via a two-step method of precursor preparation followed by ion exchange, and employed as efficient counter electrodes for quantum dot sensitized solar cells (QDSSCs). Electrochemical tests show that the interface charge transfer resistance (Rct) of MnCo2S4 is only 2.86 Ω and the Rct of MnCo2S4/CNTs further decrease to 1.09 Ω, suggesting both MnCo2S4 and its composite exhibit excellent catalytic activity for Sn2– reduction. The power conversion efficiencies of QDSSC assembled CdS/CdSe QD photoanodes with MnCo2S4 and MnCo2S4/CNTs counter electrodes reach 2.98 and 4.85%, respectively. The better photovoltaic performance of the QDSSC based on MnCo2S4/CNTs is mainly ascribed to the synergistic effect of the excellent electrocatalytic activity of MnCo2S4 itself and the conductivity of CNTs. The addition of CNTs not only significantly reduces the size of MnCo2S4 and increases catalytic activity sites, but also forms a cross-linked conductive network to accelerate the delivery of electrons. Due to the excellent reducing ability for Sn2–, MnCo2S4/CNTs is expected to be a competitive counter electrode material for efficient QDSSCs.
研究领域:
材料科学
·
能源科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Senyang Wang,Shi Tang,Mengting Hua,Yuxuan Chen,Dantian Zhang,Rao Fan,Ling Li
Raspberry-like double-core shell CdS@ZnS@NiS material was prepared to use a simple one-step hydrothermal method, and then coated uniformly on carbon nanofibers (CNFs), resulting in the formation of highly efficient counter electrode (CE) for Zn-Cu-In-Se (ZCISe) quantum dot sensitized solar cells (QDSSCs). The QDSSCs used CdS@ZnS@NiS/CNFs as CE reached power conversion efficiency (PCE) of 9.72%, which is higher than Cu 2 S/brass (8.42%). This result indicates the dual-core shell structure possesses better catalytic properties, which indicates that the raspberry-shaped double-core shell CdS@ZnS@NiS is a feasible competitor as CE material for QDSSCs.
研究领域:
材料科学
·
纳米技术
·
能源技术
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 8
·2745-2752
·
IF 6.119
Wenhua Li,Shule Zhang,Qianqiao Chen,Qin Zhong
Doping of specific boron species in carbon frameworks plays an important role in enhancing the electrochemical properties of carbon. Herein, we prepared a tailored boron species-doped carbon nanotube (CNT) catalyst as the counter electrode (CE) of quantum dot sensitized solar cells (QDSSCs) by hydrothermal post-treatment of pre-oxidized CNTs. X-ray photoemission spectroscopy results show that boron is mainly present as oxygen-containing (C–O–B) and oxygen-free (C–B) boron in the sp2 carbon framework, so different levels of pre-oxidation treatments can control the content of oxygen-containing boron species and thus achieve controlled doping of boron species. Electrochemical impedance spectroscopy shows that the optimized boron-doped CNTs (BCNT1) obtained a charge transfer resistance (Rct) as low as 2.17 Ω, indicating excellent reduction activity to Sn2− at the CE/electrolyte interface. The QDSSC based on the BCNT1 CE and CdS/CdSe photoanode achieves a power conversion efficiency of up to 4.55%, which is 3.10 times that of the pristine CNT CE. Our report confirms that tailorable boron doping is an effective strategy to enhance the activity of CNTs for Sn2− reduction.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Yuxuan Li,Weixin Li,Lei Zhao,Jing Ge,Xuan He,Wei Fang,Hui Chen
TiO 2 photoanode as the light harvest skeleton and electron transport material plays a critical role in the photovoltaic performance of the quantum dots sensitized solar cells (QDSSCs). In this paper, a bilayer-structured film with micro-flower TiO 2 as an overlayer and hierarchical porous TiO 2 as an underlayer is fabricated. The hierarchical porous TiO 2 film is synthesized by the virtue of foam and the TiO 2 micro-flower is introduced by spin-coating method. This TiO 2 micro-flower supplies more adsorption sites for CdSe quantum dots, thus leading to the enhanced light harvesting efficiency. The staggered structure between the anatase nanoparticle and the rutile micro-flower will facilitate the separation of electron-hole pairs and promote the injection process of electron. Consequently, the photovoltaic performance of QDSSCs based on the TiO 2 micro-flower modified photoanode is about 43% higher than that of the bare porous TiO 2 photoanode.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4294
·
IF 5.719
Danwen Yao,Zhenyu Hu,Ruifeng Zheng,Jialun Li,Liying Wang,Xijia Yang,Wei Lü,Huailiang Xu
Quantum dot-sensitized solar cells (QDSSC) have been regarded as one of the most promising candidates for effective utilization of solar energy, but its power conversion efficiency (PCE) is still far from meeting expectations. One of the most important bottlenecks is the limited collection efficiency of photogenerated electrons in the photoanodes. Herein, we design QDSSCs with a dual-photoanode architecture, and assemble the dual photoanodes with black TiO2nanoparticles (NPs), which were processed by a femtosecond laser in the filamentation regime, and common CdS/CdSe QD sensitizers. A maximum PCE of 11.7% with a short circuit current density of 50.3 mA/cm2is unambiguously achieved. We reveal both experimentally and theoretically that the enhanced PCE is mainly attributed to the improved light harvesting of black TiO2due to the black TiO2shells formed on white TiO2NPs.
研究领域:
材料科学
·
能源技术
·
光物理
✓ 已验证
DOI
高影响因子
IONICS
·
2024
·Vol. 30
·期 7
·4271-4279
·
IF 2.4
Wang Jianyu,Peng Yin,Wang Liying,Yang Xijia,Gao Yang,Li Xuesong,Lü Wei
Although TiO 2 has been widely used as the illumination anode in quantum dot sensitized solar cells (QDSSCs), its inherent low photovoltaic conversion efficiency remains a challenge. This study designed and prepared black rutile phase TiO 2 (B-R TiO 2 ) using sodium borohydride as a reducing agent, and utilized it as a photoanode in quantum dot-sensitized solar cells (QDSSCs). The findings illustrated that the modification of rutile phase TiO 2 through the reduction method led to changes in its surface structure which in turn affects its band structure and optical absorption properties. The increase in surface oxygen vacancy concentration resulted in an enhancement of light absorption intensity, leading to an enhanced photovoltaic conversion efficiency. Subsequently, when employed as a photoanode in QDSSCs, the photovoltaic conversion efficiency (PCE) increased from an initial 1.77% to 4.27%. X-ray photoelectron spectroscopy (XPS) analysis revealed a significant increase in the oxygen vacancy (Ov) content after reduction, resulting in a rise in short-circuit current density from the original 8.10 (mA/cm 2 ) to 15.33 (mA/cm 2 ) as observed in the J-V curve. In conclusion, the study demonstrated the effectiveness of the reduction method in modifying the black rutile phase TiO 2 , resulting in improved optical properties and improved solar cell efficiency in quantum dot-sensitized solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zizun Tian,Qianqiao Chen,Qin Zhong
Honeycomb spherical metallic 1T-MoS 2 was fabricated as an efficient counter electrode (CE) for quantum dot sensitized solar cells (QDSSCs) via facile hydrothermal method using environment-friendly F127 as soft templates. Electrochemical tests show that the interface charge transfer resistance ( R ct ) of 1T-MoS 2 is only 0.66 Ω with 3% template, demonstrating its superior electrocatalytic activity for S n 2− reduction. The power conversion efficiency of QDSSCs assembled with Ti-mesh substrate MoS 2 CEs reached 6.03%. The outstanding performance is mainly ascribed to the unique morphological advantage and intrinsically excellent conductivity, catalytic activity and hydrophilicity of 1T-MoS 2 . The honeycomb spherical 1T-MoS 2 increases the specific surface area and provides rich catalytic active sites and electrolyte transport channels, also enhances the stability of 1T-MoS 2 . The experimental results reveal 1T-MoS 2 is expected to be a competitive CE material for efficient QDSSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Shengjun Li,Zeng Chen,Tao Li,Huiping Gao,Chaochao Wei,Wei Li,Wenping Kong,Weifeng Zhang
Employing vertical nanosheet-structured films as photoanodes of quantum dot sensitized solar cells (QDSCs) might provide a direct pathway for the photo-exited electrons. Here, the vertical ZnO, ZnO/TiO 2 and TiO 2 nanosheet-structured films were prepared by a feasible deposition processes . These films were sensitized with CdS quantum dots and assembled with CuS counter electrodes to fabricate QDSCs. The photoelectric properties of ZnO/TiO 2 composite films were superior to both pure ZnO and TiO 2 films. The effects of TiO 2 coating were investigated using electrochemical impedance spectroscopy (EIS). It was found that the photo-excited electron lifetimes in the photoanode were significantly improved with TiO 2 layer. The optimum power conversion efficiency was about 1.95% under AM 1.5 G illumination (100 mW cm −2 ), with a short circuit current density, open circuit voltage, and fill factor of 6.11 mA cm −2 , 0.562 V and 0.57, respectively.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）