Nanoscale
·
2020
·Vol. 12
·期 7
·4302-4308
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IF 6.895
Yajun Pang,Wenjie Zang,Zongkui Kou,Lei Zhang,Guangqing Xu,Jun Lv,Xiaorui Gao,Zhenghui Pan,John Wang,Yucheng Wu
Low photoconversion efficiency, high charge transfer resistance and fast recombination rate are the bottlenecks of semiconductor nanomaterials in photoelectrochemical (PEC) water splitting, where the introduction of an appropriate co-catalyst is an effective strategy to improve their performance. In the present study, we have purposely designed atomic-scale dispersed bismuth (Bi) assembled on titanium dioxide nanorods (TiO2), and demonstrated its effective role as a co-catalyst in enhancing the PEC water splitting performance of TiO2. As a result, functionalized Bi/TiO2 generates a high photocurrent intensity at 1.23 VRHE under simulated solar light irradiation, which is 4-fold higher than that of pristine TiO2, exhibiting a significantly improved PEC performance for water splitting. The strategy presented in this study opens a new window for the construction of non-precious metals dispersed at atomic scales as efficient co-catalysts for realizing sustainable solar energy-driven energy conversion and storage.
研究领域:
材料科学
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能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
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
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 1
·016502
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IF 3.9
Chenzhong Yao,Huimin Ren,Bohui Wei,Chunxi Yang,Li Ma
WO3@ZnO core–shell nanoarrays with a Z-scheme heterojunction structure have been fabricated by combining electrodeposition and dropping process and used as photoanodes for the production of hydrogen peroxide (H2O2). The photocurrent density of the WO3@ZnO nanoarray photoanode is 1.57 mAcm−2 at the applied potential of 1.8 V vs reversible hydrogen electrode, which exhibits almost 4 time larger than that of pure ZnO nanoarray photoanode. A high photoconversion efficiency to the production of H2O2 (0.53%) and Faradic efficiency (33%) are also reached by this WO3@ZnO nanoarray photoanode under Air-Mass 1.5 Global (AM 1.5 G, 100 mWcm−2). This work provides an effective approach for the application of Z-scheme heterojunction in the photoelectrochemical synthesis of H2O2.
研究领域:
材料科学
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能源科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 1
·322-329
·
IF 9.931
Naveed Ur Rahman,Wasim Ullah Khan,Wenlang Li,Shaukat Khan,Javid Khan,Shizhao Zheng,Tongtong Su,Juan Zhao,Matthew P. Aldred,Zhenguo Chi
Extending the spectral response from the ultraviolet (UV) to the visible-light range and enhancing the UV-light stability are two remaining challenges for the development of perovskite solar cells (PSCs). Lanthanide complexes show a broad absorption range in the UV region and can down convert UV-light into visible-light; thus, they are potentially able to improve the device performance of PSCs. Herein, we report the fabrication of PSCs with a novel samarium (Sm)-based down conversion nanomaterial, Sr2CeO4:Sm3+ (SCOS). In comparison to the control device without a SCOS layer, the SCOS-coated device shows an enhancement of 11.4% in photocurrent and 16.2% in average power conversion efficiency (PCE), due to the harvesting and re-emitting of UV-light in the visible range through the SCOS layer. Significantly, the SCOS-coated devices retain 50% of their initial PCE for 60 hours under continuous UV-light illumination and even after 60 days of storage under ambient environment conditions, whilst for the control device the longevity is 15 hours and 26 days, respectively. The results suggest that the SCOS layer makes an important contribution in terms of both enhanced photovoltaic performance and prolonged device stability by reducing photo-loss and photo-degradation.
研究领域:
材料科学
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能源技术
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光学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 16
·2108944
·
IF 18.808
Ning Wei,Yuetian Chen,Xingtao Wang,Yanfeng Miao,Zhixiao Qin,Xiaomin Liu,Hao Wei,Yixin Zhao
The photovoltaic performance and long-term stability of perovskite solar cells (PSCs) are greatly affected by trap states. Herein, a functional ionic liquid of 1-ethyl-3-methylimidazolium trifluoroacetate (EMIMTFA) is introduced, in which the 1-ethyl-3-methylimidazolium cations (EMIM + ) can interact with PbI 2 to form a stable one-dimensional (1D) perovskite of EMIMPbI 3 , and the trifluoroacetic acid anions (TFA − ) can passivate the interface between the electron transfer layer and the perovskite layer. Unlike, the widely studied low dimensional perovskite capping layers or quasi-2D configuration, the EMIM + cations not only distribute on the top surface and inside the bulk phase, but also accumulate at the buried interface of 3D perovskite film, achieving a multi-level distribution. The different defect states are successfully passivated by this distribution mode, leading to a significant decrease of non-radiative recombination. As a result, the methyammonium lead iodide-based PSCs with the EMIMTFA additive show an enhanced photovoltaic performance with a champion power conversion efficiency up to 22.14% and improved long-term stability. This work demonstrates that the formation of multilevel low-dimensional structure is a new strategy for the preparation of efficient and stable PSCs.
研究领域:
材料科学
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光伏技术
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能源科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Lingxia Zheng,Xiaoying Ye,Xiaolei Deng,Yongzhi Wang,Yijian Zhao,Xiaowei Shi,Huajun Zheng
Photon absorption, charge separation and transportation, and charge-induced reactions at the active sites are the main crucial factors involved in the photoelectrochemical (PEC) water splitting. Herein, a combination of black phosphorus quantum dot (BPQD) sensitization and defect engineering strategies is employed to optimize the PEC performance of one-dimensional TiO2 nanotube array (NTA) photoanodes. The as-prepared TiO2–x/BP electrode exhibits a strong photocurrent density under simulated solar light irradiation, which is almost ∼3 times higher than that of bare TiO2. Specifically, the photocurrent increment of TiO2–x/BP is even larger than the sum of TiO2–x and TiO2/BP, verifying the synergistic effect of oxygen vacancies and BPQD sensitization. The maximum photoconversion efficiency of TiO2–x/BP is as high as 0.35%, while the value of TiO2 NTAs is calculated to be 0.13%. The results reveal that oxygen vacancies and BPQDs in the TiO2–x/BP composite not only facilitate the charge separation and transportation but also enhance the activity and quantity of reactive sites for water oxidation. The present strategy might open new routes to develop high-performance photoelectrodes for water splitting.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2020
·Vol. 49
·期 12
·7054-7064
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IF 1.774
Luo Jundong,Wei Aixiang,Luo Ningqi,Liu Jun,Zhao Yu,Xiao Zhiming
The effects of the formamidinium (FA) + alloy fraction x and the dipping time on the properties of FA x MA 1− x PbI 3 thin films (where MA = methylammonium ) as well as the photovoltaic performance of perovskite solar cells (PSCs) have been studied. Mixed-organic-cation FA x MA 1− x PbI 3 thin films were prepared using a two-step solution deposition method in ambient air. PSCs with fluorine-doped tin oxide glass/compact TiO 2 /mesoporous TiO 2 /FA x MA 1− x PbI 3 /carbon electrode structure were fabricated, aiming to reduce the fabrication costs and improve the stability of PSCs. The results indicated that, when the FA + alloy fraction x was increased from 0 to 1, the x-ray diffraction (XRD) peaks shifted continuously to lower angle, while the absorption edge and photoluminescence (PL) peak shifted continuously towards longer wavelength. The Raman spectra of the FA x MA 1− x PbI 3 thin films, consisting of five typical peaks at 68.5 cm −1 , 77.5 cm −1 , 84.6 cm −1 , 139.1 cm −1 , and 283.2 cm −1 , barely shifted with incorporation of FA + . In addition, the dipping time was shortened by using mixed solvents to prepare the PbI 2 thin films. The PSCs based on FA 0.4 MA 0.6 PbI 3 prepared with a dipping time of 15 min exhibited the highest average power conversion efficiency (PCE) of 8.64%, with 74.4% of the initial efficiency being retained after exposure to ambient air at room temperature with approximately 50% humidity for 700 h.
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Di Zhang,Sidong Zhang,Yanyan Fang,Dongmei Xie,Xiaowen Zhou,Yuan Lin
Introducing bifunctional linkers (COOH-R-SH) between TiO 2 electrodes and quantum dots (QDs) was an effective apprIntroducing bifunctional linkers (COOH-R-SH) between TiO 2 electrodes and quantum dots (QDs) was an effective approach in preparation of quantum dot-sensitized solar cells (QDSCs). Three types of linkers (4-mercaptobenzoic acid (MBA, R =phenyl), 3-thiophenecarboxylic acid (TPA, R =thiophene), and thioglycolic acid (TGA, R =alkyl)) were used to functionalize TiO 2 electrodes and prepare TiO 2 /CdSe QDSCs with photoelectric conversion efficiency (PCE) of 5.50%, 4.59% and 4.85%, respectively. Various properties of modified and blank TiO 2 electrodes, such as QDs loading, absorbance, work function, interfacial charge injection, recombination and their influence on PCE were investigated. In spite of low adsorption amounts of MBA on TiO 2 , the phenyl MBA-TiO 2 electrodes obtained the highest Cd content due to regular arrangement and strong affinity to QDs. The FTIR spectra proved strong interactions between MBA and TiO 2 electrodes, leading to fast electron injection from QDs to TiO 2 electrodes. The electron injection rate in MBA-TiO 2 electrodes was the same as blank-TiO 2 , larger than TGA- and TPA-ones. Work function of TiO 2 electrodes modified by linkers could reduce several eV , in which the MBA-one decreased less, corresponding to the highest applied potential difference. The open-circuit voltage-decay measurement demonstrated that the MBA-TiO 2 photoanodes had the least charge recombination. Enhanced light absorption capacity and fast electron injection rate were two key points for modified cell to improve short-circuit current, while low recombination and appropriate energy level positions increased open-circuit voltage. Those make MBA-TiO 2 photoanodes obtain the best efficiency of 5.50%. We expected this work to guide the selection of linkers for design and optimization of photoanodes interface of QDSCs.oach in preparation of quantum dot-sensitized solar cells (QDSCs). Three types of linkers (4-mercaptobenzoic acid (MBA, R =phenyl), 3-thiophenecarboxylic acid (TPA, R =thiophene), and thioglycolic acid (TGA, R =alkyl)) were used to functionalize TiO 2 electrodes and prepare TiO 2 /CdSe QDSCs with photoelectric conversion efficiency (PCE) of 5.50%, 4.59% and 4.85%, respectively. Various properties of modified and blank TiO 2 electrodes, such as QDs loading, absorbance, work function, interfacial charge injection, recombination and their influence on PCE were investigated. In spite of low adsorption amounts of MBA on TiO 2 , the phenyl MBA-TiO 2 electrodes obtained the highest Cd content due to regular arrangement and strong affinity to QDs. The FTIR spectra proved strong interactions between MBA and TiO 2 electrodes, leading to fast electron injection from QDs to TiO 2 electrodes. The electron injection rate in MBA-TiO 2 electrodes was the same as blank-TiO 2 , larger than TGA- and TPA-ones. Work function of TiO 2 electrodes modified by linkers could reduce several eV , in which the MBA-one decreased less, corresponding to the highest applied potential difference. The open-circuit voltage-decay measurement demonstrated that the MBA-TiO 2 photoanodes had the least charge recombination. Enhanced light absorption capacity and fast electron injection rate were two key points for modified cell to improve short-circuit current, while low recombination and appropriate energy level positions increased open-circuit voltage. Those make MBA-TiO 2 photoanodes obtain the best efficiency of 5.50%. We expected this work to guide the selection of linkers for design and optimization of photoanodes interface of QDSCs.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiejun Ren,Andries Meijerink,Xiaopeng Zhou,Jiapeng Wu,Gangyi Zhang,Yuhua Wang
All-inorganic perovskite quantum dots (PQDs), which possess outstanding photophysical properties, are regarded as promising materials for optoelectronic applications. However, the poor light conversion efficiency and severe stability problem hinder their widespread applications. In this work, a novel encapsulation strategy is developed through the in situ growth of CsPbX3 PQDs in presynthesized mesoporous cerium-based metal organic frameworks (Ce-MOFs) and further silane hydrolysis–encapsulation, generating stable CsPbX3@Ce-MOF@SiO2 composites with greatly enhanced light conversion efficiency. Moreover, the simulation results suggest that the pore boundary of Ce-MOFs has a strong waveguide effect on the incident PQD light, constraining PQD light inside the bodies of Ce-MOFs and suppressing reabsorption losses, thus increasing the overall light conversion efficiency of PQDs. Meanwhile, the Ce-MOF@SiO2 protective shell effectively improves the stability by blocking internally embedded PQDs from the harmful external environment. Further, the obtained white-light-emitting diode shows an ultrahigh luminous efficiency of 87.8 lm/W, which demonstrates their great potential in optoelectronic applications.
研究领域:
材料科学
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光学工程
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Jiurong Li,Jiancang Chen,Xiujian Zhao,Alberto Vomiero,Xiao Gong
Carbon dots (CDs) generally suffer from aggregation-induced fluorescence quenching effect in solid-state, which significantly limits their application in photoelectric devices. Due to this effect, it is a great challenge to achieve high-transparency and high-performance luminescent solar concentrators (LSCs) based on CDs. Here, the synthesis of organosilane-grafted carbon dots (Si-CDs) is rationally designed by hydrothermal method using anhydrous citric acid, ethanolamine and KH-792 as the reaction precursors. The obtained Si-CDs can be uniformly dispersed in the polyvinyl alcohol (PVA) matrix through the dehydration condensation reaction and hydrogen bonding between the silicon hydroxyl group of Si-CDs and the hydroxyl group of PVA. Based on this property, Si-CDs/PVA thin-film LSCs (5 × 5 × 0.2 cm 3 ) with ultrahigh CD loading (25 wt%) and high transparency can be fabricated, exhibiting excellent absorption in the UV spectral region and about 90 % transmission in the visible range. Furthermore, the power conversion efficiency (PCE) of the LSCs can reach 2.09 % under a standard solar light and shows excellent stability even over 12 weeks. This synthetic design is expected to be beneficial for future development of CD synthesis and paves the way for the development of CDs-based photoelectric devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 19
·2215032
·
IF 19
Meng Fan,Jinpeng Huang,Lyudmila Turyanska,Zhenfeng Bian,Liancheng Wang,Chunyang Xu,Nan Liu,Hongbo Li,Xiaoyu Zhang,Chengxi Zhang,Xuyong Yang
Metal halide perovskite quantum dots (QDs) have emerged as potential materials for high brightness, wide color gamut, and cost-effective backlight emission due to their high photoluminescence quantum yields, narrow emission linewidths, and tunable bandgaps. Herein, CsPbX 3 /SBA-15 nanocomposites are prepared with outstanding optical properties and high stability through an in situ growth strategy using mesoporous silica particles. According to finite-difference time-domain simulations, the mesoporous structure provides a strong waveguide effect on perovskite QDs and the uniform dispersion suppresses reabsorption losses, improving the overall photoconversion efficiency of perovskite QDs. The as-fabricated perovskite monochromatic light-emitting diode (LED) has a maximum luminous efficiency of 183 lm W −1 , which is the highest for monochromatic perovskite LEDs reported to date. A further benefit of this work is that the white devices, which combine the green and red perovskite nanocomposites with commercial blue LED, exhibit a high luminous efficiency of 116 lm W −1 and a wide color gamut (125% for NTSC and 94% for Rec. 2020) with coordinates of (0.33,0.31).
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yiming Wang,Yanchun Yang,Ruijian Liu,Shuyu Li,Hongmei Luan,Lei Wang,Letu Siqin,Chengjun Zhu
Morphology of the absorber plays a decisive role in photoelectric conversion efficiency (PCE) of kersterite solar cells. Cu2ZnSn(S,Se)4 (CZTSSe) grain prepared from dimethyl sulfoxide (DMSO)-based solution easily grows into large grains, which can lead to the formation of some holes at the back of the absorber. These holes cause the recombination of photocarriers and greatly weaken the performance of CZTSSe devices. Here, trace amounts of thioglycolic acid (TGA) are introduced to the DMSO-based solution, and a combination of TGA and metal is formed in the absorber, leading to the formation of fine grains in the CZTSSe absorber. Next, post-annealing (PA) in a N2 atmosphere is performed to promote Na diffusion, helping the transition from a fine-grain layer to a low-resistivity carbon layer at the interface between CZTSSe and Mo and avoiding the drawbacks of the DMSO-based system. Finally, the champion PCE of the CZTSSe device can be improved to 10.05% from 8.06%. The conclusions demonstrate that the construction of a carbon layer can boost the performance of CZTSSe devices.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）