Article
Electrochemistry
Di Zhang, Sidong Zhang, Yanyan Fang, Dongmei Xie, Xiaowen Zhou, Yuan Lin
Summary: Introducing bifunctional linkers between TiO2 electrodes and quantum dots was an effective approach for the preparation of quantum dot-sensitized solar cells. Three types of linkers were studied, with phenyl MBA-TiO2 electrodes achieving the highest Cd content and PCE. The modified TiO2 electrodes showed lower electron recombination rates and higher efficiency, demonstrating the importance of linker selection for QDSCs design and optimization.
ELECTROCHIMICA ACTA
(2021)
Review
Chemistry, Physical
Akash S. Rasal, Sudesh Yadav, Anil A. Kashale, Ali Altaee, Jia-Yaw Chang
Summary: This review discusses the factors influencing the performance stability of QDSSCs and provides insights into the mechanisms causing degraded performances. It also presents cutting-edge strategies for improving the overall performance stability of QDSSCs.
Article
Chemistry, Multidisciplinary
Yao-Sheng Cheng, Yu-Ting Wu, Sofiannisa Aulia, Ching-Cheng Chang, Mia Rinawati, Ting-Ying Lee, Jia-Yaw Chang, Ni Luh Wulan Septiani, Brian Yuliarto, Min-Hsin Yeh
Summary: A quantum dot-sensitized solar cell (QDSSC) with cobalt manganese sulfide (CMS) composites as counter electrodes (CE) exhibits improved activity and stability. By controlling the precursor ratio of Co and Mn, the bimetallic CMS can be adjusted to manipulate the Sn2- reduction activity. The optimized CMS CEs also demonstrate a high solar-to-electricity conversion efficiency of 5.88 +/- 0.19% under 100 mW cm-2 irradiation, indicating their superior reduction activity to Sn2-.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Bin Bin Jin, Hui Sheng Huang, Shu Ying Kong, Guo Qing Zhang, Biao Yang, Chu Xing Jiang, Ya Zhou, Dan Jun Wang, Jing Hui Zeng
Summary: In this study, ATO/PbSe composite was designed as the counter electrode for QDSSCs, showing enhanced electrocatalytic activity and stability compared to PbSe CE obtained by PVD. The improved performance is attributed to the high specific surface area, permeability, conductivity, and interface connectivity of ATO/PbSe CE, providing more active sites for reduction and fast channels for ion diffusion and electron transport. As a result, the CdS QDSSCs and CdS/CdSe co-sensitized QDSSCs assembled with ATO/PbSe CE exhibited higher power conversion efficiency than PbSe CE obtained by PVD, with stable photovoltaic properties over 200 minutes.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
S. Liu, R. Fan, Y. Zhao, M. Yu, L. Li, Q. Li, B. Liang, W. Zhang
Summary: In this study, a relatively less toxic CISSe quantum dot was prepared by an organic high-temperature hot injection method for use in QD-sensitized solar cells. Through Sn doping and ZnS passivation, the electron collection efficiency was improved and charge recombination was inhibited, resulting in a power conversion efficiency of 6.7% for the QDSSC.
MATERIALS TODAY ENERGY
(2021)
Article
Energy & Fuels
Tamal Dey, Arup Ghorai, Soumen Das, Samit K. Ray
Summary: The choice of solvent used in the synthesis of nitrogen-doped graphene quantum dots (N-GQDs) significantly affects the photovoltaic performance of quantum dot sensitized solar cells (QDSSC). Switching to aprotic solvent DMF enhances nitrogen units in the graphene quantum dots framework, improving carrier density and transport properties, and resulting in better photovoltaic performance for QDSSC.
Review
Biochemistry & Molecular Biology
Nguyen Thi Kim Chung, Phat Tan Nguyen, Ha Thanh Tung, Dang Huu Phuc
Summary: This study provides an overview of quantum dot application in solar cells, replacing dye molecules. The different types of quantum dot sensitized solar cells are presented with obtained results and their respective advantages and disadvantages. Lastly, methods for improving efficiency performance in future research are proposed.
Article
Energy & Fuels
Wenlei Lv, Yilong Lei, Jianping Deng, Junfei Fang, Wendeng Huang
Summary: Metal ion doping is an effective method to improve the optical and electrical properties of quantum dots (QDs). In this study, Zn-doped CdS and CdSe QDs were synthesized using the SILAR method and utilized in the construction of sensitized solar cells (QDSSCs). The results showed that Zn doping significantly enhanced the power conversion efficiency (PCE) of the QDSSCs by improving the current density, open-circuit voltage, and light absorbance. The Zn doping also reduced the interfacial charge recombination rate and prolonged the electron lifetime, resulting in more efficient charge collection in the QDSSCs.
Review
Chemistry, Physical
Layla Haythoor Kharboot, Nor Akmal Fadil, Tuty Asma Abu Bakar, Abdillah Sani Mohd Najib, Norhuda Hidayah Nordin, Habibah Ghazali
Summary: Third-generation solar cells, such as dye-sensitized solar cells and quantum dot-sensitized solar cells, require counter electrodes (CEs) for their functionality. Platinum-based CEs are dominant but expensive, thus alternative materials like transition metal chalcogenides (TMCs) and transition metal dichalcogenides (TMDs) have been explored. This study provides a comprehensive review of the major components and working principles of these solar cells, and evaluates the performance efficiencies resulting from TMS-based CEs compared to Pt-based CEs.
Article
Chemistry, Physical
Miguel Albaladejo-Siguan, David Becker-Koch, Elizabeth C. Baird, Yvonne J. Hofstetter, Ben P. Carwithen, Anton Kirch, Sebastian Reineke, Artem A. Bakulin, Fabian Paulus, Yana Vaynzof
Summary: Light-harvesting devices made from lead sulfide quantum dot absorbers have promising applications in third-generation photovoltaics. Passivating the quantum dot surfaces and managing the excess lead halide can improve device performance and stability.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Zhiyuan Huang, Ji Hao, Jeffrey L. Blackburn, Matthew C. Beard
Summary: This research demonstrates control of pyroelectricity in nanocrystalline systems by constructing a system built from spherical PbS quantum dots that can self-assemble into close-packed arrays or disperse into a polymer, both exhibiting a pyroelectric response. The polarization of each quantum dot can be easily tuned by constructing different Janus-ligand shells.
Article
Energy & Fuels
Xiaobo Chen, Yefei Zhuang, Qingyu Shen, Xiaoyu Cao, Wen Yang, Peizhi Yang
Summary: Using MXene/CoS as a high electrocatalytic counter electrode in QDSSCs significantly enhances cell performance, mainly due to the synergistic effects of the unique layered morphology of conductive MXene nanosheets and cocatalysis with CoS nanoparticles, providing abundant catalytic active sites.
Article
Chemistry, Physical
Wei Wang, Yiling Xie, Fangfang He, Yuan Wang, Weinan Xue, Yan Li
Summary: In quantum dot-based solar cells (QDSCs), the balance between QD loading and TiO2 film thickness significantly affects the performance. A relatively thin photoanode prepared by a cationic surfactant-assisted multiple deposition procedure achieved a high QD loading comparable to that of the commonly used thick photoanode. Under optimized conditions, the Zn-Cu-In-Se and Zn-Cu-In-S based QDSCs showed a comparable power conversion efficiency (PCE) to those with significantly thicker photoanodes (over 25.0 μm).
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Chemistry, Physical
Xing Meng, Yifan Chen, Fan Yang, Jieqi Zhang, Guozheng Shi, Yannan Zhang, Haodong Tang, Wei Chen, Yang Liu, Lin Yuan, Shaojuan Li, Kai Wang, Qi Chen, Zeke Liu, Wanli Ma
Summary: This study explores the potential of using conjugated polymers as hole-transporting layer (HTL) in lead sulfide (PbS) quantum dot solar cells. The precise regulation of the inorganic/organic interface is crucial for achieving high-performance devices. By introducing CsPbl(3) quantum dots as an interfacial layer between the PbS quantum dot active layer and the organic polymer HTL, the interface is mediated and favorable energy level alignment is achieved, resulting in improved charge extraction and reduced interfacial charge recombination. As a result, the photovoltaic performance is efficiently improved from 10.50% to 12.32%. This study may provide new guidelines for the device structural design of quantum dot optoelectronics by integrating different solution-processed semiconductors.
Article
Energy & Fuels
Jiangcai Wang, Zhuoyin Peng, Jincheng Huang, Yuanfang Zhang, Xinlong Zhang, Yue Wang, Yilong Fu, Wei Li, Jian Chen, Keqiang Chen
Summary: The loading amount of quantum dots and trap density are important issues for quantum dot sensitized solar cells. This study used an anatase TiO2 nanodendrite array as the photo-electrodes for CuInS2 quantum dot sensitized solar cells instead of the traditional TiO2 nanowire array. The CuInS2 quantum dots sensitized photo-electrodes based on the anatase TiO2 nanodendrite array exhibited excellent charge generation and separation properties. The branches from the nanodendrite array provided more paths for charge transfer and reduced charge recombination traps, resulting in higher current density and increased photovoltaic conversion efficiency from 4.7% to 5.48%.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Review
Computer Science, Information Systems
Kummara Venkat Guru Raghavendra, Kamran Zeb, Anand Muthusamy, T. N. V. Krishna, S. V. S. V. Prabhudeva Kumar, Do-Hyun Kim, Min-Soo Kim, Hwan-Gyu Cho, Hee-Je Kim
Article
Energy & Fuels
Kamran Zeb, Muhammad Saqib Nazir, Iftikhar Ahmad, Waqar Uddin, Hee-Je Kim
Summary: This paper presents successful control of DC-link voltage, active power, and reactive power in a transformerless grid-connected inverter using Adaptive-PI and Adaptive-Sliding Mode Controller. The system also utilizes a PR controller based on RHC and a SOGI-based PLL for improved performance.
Article
Energy & Fuels
Ikkurthi Kanaka Durga, Kummara Venkata Guru Raghavendra, Naga Bhushanam Kundakarla, Suresh Alapati, Jin-Woo Ahn, Sunkara Srinivasa Rao
Summary: Nanocomposite electrodes with binder-free ZnO/CoS2 nanostructures synthesized through a cost-effective hydrothermal route exhibit excellent battery-type behavior, showing promising applications in supercapacitors.
Article
Energy & Fuels
Waqar Uddin, Tiago D. C. Busarello, Kamran Zeb, Muhammad Adil Khan, Anil Kumar Yedluri, Hee-Je Kim
Summary: This paper presents a control method for output and circulating currents of modular multilevel converter, utilizing arm currents to control DC and AC components separately. The effectiveness of the proposed control scheme is demonstrated through comparative results and simulation on a three-phase, five-level MMC in MATLAB/Simulink.
Article
Polymer Science
Rajangam Vinodh, Raji Atchudan, Hee-Je Kim, Moonsuk Yi
Summary: This review presents the recent development of polysulfone-based electrolyte membranes and their composites for fuel cell applications. The influence of fillers on the performance of electrolyte membranes is discussed, along with the key issues of enhancing ionic conductivity and chemical stability. The future research directions for polymer electrolyte membranes are also briefly summarized.
Article
Computer Science, Information Systems
Gwang-Ho Lee, Do-Hyun Kim, Min-Soo Kim, Hee-Je Kim, Sung-Shin Kim
Summary: This research successfully reduced the measurement error of TRO concentration by calibrating LED modules and optimizing LED aging, resulting in a significant improvement in measurement accuracy and precision to 0.10% and 0.85%, respectively. Experimental results confirmed the improvement of non-uniform LED light, and the standard values for TRO concentration measurement were met.
Article
Computer Science, Information Systems
Do-Hyun Kim, Min-Soo Kim, Kandasamy Prabakar, Hee-Je Kim
Summary: Fast charging technology has gained attention due to the increased use of batteries in electric vehicles, light electric vehicles, and energy storage systems. However, fast charging can lead to issues such as fire, heat, and battery performance degradation. This paper proposes a real-time monitoring system to efficiently manage the charger and battery status.
Article
Energy & Fuels
Yedluri Anil Kumar, Bandar Ali Al-Asbahi, Mohan Reddy Pallavolu, Sunkara Srinivasa Rao, Ramesh Reddy Nallapureddy, Seeram Ramakrishna
Summary: Developing efficient construction to tailor the multiple structure defects of nanomaterials is a captivating approach for designing unique electroactive materials for supercapacitors. This study successfully synthesized Ni-doped tungsten disulfide nanorod arrays on nickel foam using a hydrothermal technique, resulting in a configuration with abundant interconnected nanorods. The Ni-doped WS2/NF NRs electrode exhibited a high specific capacity and outstanding cycling stability, which can be attributed to enhanced conductivity and richer active sites in the multiple structural electroactive materials.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Yedluri Anil Kumar, Mani Govindasamy, Mohan Reddy Pallavolu, Sangaraju Sambasivam, Sunkara Srinivasa Rao, Ramesh Reddy Nallapureddy, Ayman Ahmed Ghfar, Ammar Mohamed Tighezza
Summary: The interior and interface coexisting design of cobalt-doped NiFe2S4 nano sheets on nickel foam (Co-NiFe2S4) were synthesized via a two-step hydrothermal approach. The Co-NiFe2S4 composite exhibited superior electrochemical performance with high capacity and excellent capacity retention, making it a promising electrode material for high-performance supercapacitors.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Yedluri Anil Kumar, G. Mani, Mohan Reddy Pallavolu, Sangaraju Sambasivam, Ramesh Reddy Nallapureddy, Manickam Selvaraj, M. Alfakeer, Aboud Ahmed Awadh Bahajjaj, Mohamed Ouladsmane, Sunkara Srinivasa Rao, Seeram Ramakrishna
Summary: In this research, a tungsten disulfide/iron cobaltite interwoven construction array was prepared and used as an integrative electrode for supercapacitors. The WS2/FeCo2O4 nanosheets provided a larger surface area and sufficient space for volume changes, leading to prominent energy storage performances in the supercapacitors.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Rajangam Vinodh, Rajendran Suresh Babu, Raji Atchudan, Hee-Je Kim, Moonsuk Yi, Leandro Marques Samyn, Ana Lucia Ferreira de Barros
Summary: This study presents the synthesis of porous NiO nanoparticles through a simple hydrothermal method and demonstrates their excellent electrochemical performance. The unique morphology of NiO plays a crucial role in enabling efficient ion transport, shortening electron and ion pathways, and providing active sites for electrochemical reactions. Moreover, the assembled asymmetric supercapacitor (ASC) composed of NiO-300 and activated carbon (AC) shows outstanding supercapacitive performance.
Review
Chemistry, Multidisciplinary
Rajangam Vinodh, Rajendran Suresh Babu, Sangaraju Sambasivam, Chandu V. V. Muralee Gopi, Salem Alzahmi, Hee-Je Kim, Ana Lucia Ferreira de Barros, Ihab M. Obaidat
Summary: Supercapacitors, with their excellent capacitance and rate efficiency, extended durability, and cheap materials price, are regarded as one of the most promising energy storage devices. The choice of electrode materials is critical for the performance of supercapacitors. The combination of polyaniline (PANI) and metal-organic frameworks (MOFs) as electrode materials shows additional benefits and is predicted to be the next-generation electrode materials for efficient supercapacitors.
Article
Computer Science, Information Systems
Min-Soo Kim, Do-Hyun Kim, Hee-Je Kim, Kandasamy Prabakar
Summary: In this paper, a novel strategy for monitoring PV junction boxes based on LoRa technology is proposed. The wireless transmission of data collected from the PV junction boxes enables real-time monitoring and display of the received data on an LCD screen. The system shows stable communication reception and excellent performance in maintaining signal strength and packet error rate, even in non-line-of-sight environments.
Article
Mathematics, Applied
Suresh Alapati, Wooseong Che, Sunkara Srinivasa Rao, Giang T. T. Phan
Summary: Mathematical modeling and analysis of biologically inspired systems have been an exciting research topic in recent years. In this study, we simulated the rotational motion of an elastic rod in a viscous fluid using the lattice Boltzmann method combined with an immersed boundary method. The results were consistent with previous publications, and we also found that our simulation technique is more computationally efficient than previous works.
Article
Chemistry, Multidisciplinary
Ikkurthi Kanaka Durga, Dasha Kumar Kulurumotlakatla, Tholkappiyan Ramachandran, Yedluri Anil Kumar, D. Amaranatha Reddy, K. V. G. Raghavendra, Asma A. Alothman, Sunkara Srinivasa Rao
Summary: Nickel molybdate oxide and tungsten trioxide have potential as electrode materials for supercapacitors, but their poor conductivity and fast capacitance fading limit their performance. By building a hierarchical nanoflower structure, the electrochemical performance of the supercapacitor is enhanced.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
