Article
Engineering, Chemical
Anjali A. Meshram, K. Aashish Moses, Saroj S. Baral, Sharad M. Sontakke
Summary: In this study, a novel photocatalyst was synthesized to simultaneously degrade industrial effluent and produce hydrogen through photocatalytic reactions. The resulting composite exhibited high hydrogen evolution rate without using sacrificial agents and showed excellent reusability.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yang Shao, Huub J. M. de Groot, Francesco Buda
Summary: The study focuses on improving the performance of dye-sensitized photoelectrochemical cell (DS-PEC) devices by tailoring the four-photon water oxidation half-reaction and using a Ru-based water oxidation catalyst (WOC) covalently bound to NDI dye functionalities to create a two-channel model. This model enables two separate parallel electron-transfer channels in the catalytic cycle, leading to the development of novel high-efficiency supramolecular complexes for DS-PEC devices. The proposed photocatalytic cycle of the two-channel model provides insight for building and conserving spin multiplicity as a design principle along the reaction coordinate.
Article
Chemistry, Physical
Long Wang, Luke Wang, Kaixin Zhao, Danhui Cheng, Wenhao Yu, Jiayu Li, Jing Wang, Feng Shi
Summary: An efficient visible light responsive photocatalyst Ce/N co-doped SrTiO3 was prepared via a hydrothermal method and characterized for its properties. Ce/N co-doped SrTiO3 exhibited a more intense photocurrent response and lower surface resistance compared to N-SrTiO3 and Ce-SrTiO3. The water splitting rate of Ce/N-co-doped SrTiO3 was 84.49 times higher than that of pure SrTiO3.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Biochemistry & Molecular Biology
Angelina V. Zhurenok, Danila B. Vasilchenko, Ekaterina A. Kozlova
Summary: This review provides a comprehensive analysis of studies on graphitic carbon nitride as a photocatalyst for hydrogen production. Various approaches to synthesizing photocatalysts based on g-C3N4 are considered, including methods for modifying and improving the material's structural and photocatalytic properties. The review also discusses the effect of platinum cocatalyst on the activity of the resulting photocatalyst.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Madasamy Thangamuthu, Kiran Vankayala, Lunqiao Xiong, Stuart Conroy, Xiaolei Zhang, Junwang Tang
Summary: The stoichiometric water splitting using a solar-driven Z-scheme approach is a promising solution to the growing demand for renewable energy and environmental concerns. In this study, a robust Z-scheme system was constructed using only tungsten oxides, enabling efficient visible-driven water splitting. The system achieved high H2 and O2 production rates in a neutral solution, with an apparent quantum yield of 6.06% at 420 nm. The selective production of H2 and O2 was attributed to the preferential adsorption of iodide and iodate on the respective photocatalysts. This liquid Z-scheme system, combined with efficient shuttle molecules, offers a safe and separated H2 and O2 evolution process.
Review
Energy & Fuels
Zhi Jiang, Zhen Ye, Wenfeng Shangguan
Summary: This paper provides a summary of the cutting-edge research in solar energy-driven photocatalytic water splitting, including the overall water splitting system and photocatalytic reaction engineering. It gives an overview of recent progress and emphasizes the challenges and opportunities in the current system.
FRONTIERS IN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Qun Ding, Xuejun Zou, Jun Ke, Yuying Dong, Yubo Cui, Guang Lu, Hongchao Ma
Summary: In this study, a 3D/2D NiCo2O4/g-C3N4 S-scheme heterojunction is constructed to enhance H2 evolution under visible light. The addition of NiCo2O4 nanoballs effectively adjusts the moving routes of photoinduced electrons and holes, leading to a significant improvement in H2 generation. The g-C3N4 modified 3D NiCo2O4 nanoballs exhibit excellent photocatalytic activity for hydrogen production.
Review
Nanoscience & Nanotechnology
Irfan Ullah, Akhtar Munir, Ali Haider, Najeeb Ullah, Irshad Hussain
Summary: Sunlight and water are plentiful and sustainable energy resources. The development of artificial catalytic systems inspired by natural photosystems for solar-induced water splitting to produce hydrogen is a challenging task for chemists and energy experts. Despite considerable research efforts, the development of efficient, stable, and economic photocatalysts remains a goal for large-scale hydrogen production.
Article
Energy & Fuels
Detlef Bahnemann, Peter Robertson, Chuanyi Wang, Wonyong Choi, Helen Daly, Mohtaram Danish, Hugo de Lasa, Salvador Escobedo, Christopher Hardacre, Tae Hwa Jeon, Bupmo Kim, Horst Kisch, Wei Li, Mingce Long, M. Muneer, Nathan Skillen, Jingzheng Zhang
Summary: As nations transition towards low or net zero carbon economies due to global climate change, the need for practical alternative fuels is urgent. Hydrogen gas is considered one of the most desirable substitutes for traditional hydrocarbons, but obtaining "green" hydrogen from low or zero carbon footprint sources presents challenges. Research focuses on practical techniques for producing "green" hydrogen through photocatalytic or photoelectrocatalytic processes. However, the capability of this technology to produce hydrogen at scale has faced significant issues. This road map article explores various aspects of photocatalytic and photoelectrocatalytic hydrogen generation, including processes, materials science, reactor engineering, and biomass reforming applications.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Jorge L. Dominguez-Arvizu, Jaime A. Jimenez-Miramontes, Blanca C. Hernandez-Majalca, Gabriela E. Valenzuela-Castro, Felipe A. Gaxiola-Cebreros, Jesus M. Salinas-Gutierrez, Virginia Collins-Martinez, Alejandro Lopez-Ortiz
Summary: This study focuses on the synthesis of p-n heterojunctions of NiFe2O4/Cu2O for photocatalytic water splitting. The evaluation of their properties and photocatalytic activity reveals a direct correlation between charge carrier concentration and hydrogen production, suggesting the potential application of these heterojunctions in this field.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Review
Chemistry, Multidisciplinary
Muhammad Mohsin, Tehmeena Ishaq, Ijaz Ahmad Bhatti, Maryam, Asim Jilani, Ammar A. Melaibari, Nidal H. Abu-Hamdeh
Summary: This article discusses the application of nanomaterials in photocatalytic hydrogen production. Nanomaterials are attractive due to their high specific surface area, morphology, and light absorption. Hydrogen, as a clean and green energy source, can help mitigate the existing energy crisis and environmental pollution caused by fossil fuels. The article summarizes various techniques to enhance hydrogen production, including the thermochemical process, electrocatalytic process, and direct solar water splitting. It also reviews modification strategies such as band gap engineering, semiconductor alloys, and multiphoton photocatalysts. This review can serve as a reference for researchers and encourage the development of new materials for hydrogen generation.
Review
Chemistry, Physical
Fateh Mikaeili, Tessa Gilmore, Pelagia-Iren Gouma
Summary: Rapid population growth and increasing energy consumption have led to environmental pollution and energy demands. Therefore, research on innovative wastewater treatment and utilization of renewable energy sources has become necessary. This review focuses on recent progress in photocatalysis for water splitting, including the introduction of photocatalysis and hydrogen as a fuel source, explanation of water splitting, discussion of ideal photocatalytic materials, current material systems, limitations, and the potential of TiO2 systems in future photocatalysis research.
Review
Chemistry, Physical
Muhammad Asghar Rasool, Rabia Sattar, Ayesha Anum, Sami A. Al-Hussain, Sajjad Ahmad, Ali Irfan, Magdi E. A. Zaki
Summary: Currently, the global energy shortage and environmental pollution are important issues that need to be addressed. Fossil fuels, the traditional energy source, contribute to greenhouse gas emissions and exacerbate global warming. Green energy, particularly hydrogen, is seen as a promising alternative. Photocatalytic water splitting (PWS) under solar irradiation has the potential to address energy and environmental challenges. In this process, carbon-based materials such as graphene, carbon nanotubes, and carbon quantum dots can act as efficient photocatalysts. This review provides a comprehensive explanation of the mechanism and chemistry of carbon-based photocatalytic semiconductors for hydrogen production, as well as discussing the challenges and future prospects of PWS.
Review
Chemistry, Multidisciplinary
Qi Yu, Zhang Fuxiang
Summary: This article reviews the basic concepts, testing methods, types of photocatalytic reactions, and efficiency measurement techniques in the field of photocatalytic water splitting to produce hydrogen. It introduces the development of photocatalytic materials and summarizes the key research progresses in light absorption, charge separation, and surface catalytic reactions. Strategies for improving charge separation and promoting surface catalysis are discussed. The research progress in one-step and two-step photo-excitation systems for photocatalytic overall water splitting is summarized. The challenges and potential development directions of photocatalytic water splitting are analyzed and prospectively discussed.
ACTA CHIMICA SINICA
(2022)
Article
Chemistry, Physical
Dongbo Xu, Lijie Chen, Xiaowu Zhang, Lili Li, Qijia Ding, Guoxing Zhu
Summary: In this study, a photocatalyst was prepared by utilizing metal-organic framework derived metal oxides as catalysts, combined with niobate, showing enhanced photocatalytic activity for water splitting. The addition of Co3O4 as a co-catalyst further improved the photocatalytic performance of the catalyst.
SURFACES AND INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Sangyoon Oh, Sang Kyu Park, Soo Young Park
Summary: This study introduces a novel fabrication process of patterned taping using all-dry soft lithography to ensure the formation of sharp interface and preserve the original performance of individual semiconductor channels. Unlike other bi-component active layer devices, the laterally aligned n-/p-channel in this study secures clear ambipolarity.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Hyun-Jun Lee, Abasi Abudulimu, Juan Carlos Roldao, Hyunwoo Nam, Johannes Gierschner, Larry Lueer, Soo Young Park
Summary: A highly efficient photocatalytic system for hydrogen evolution was developed using self-assembled nanoparticles based on an octupolar molecule. The addition of halide ions improved the rate of hydrogen evolution reaction due to the external heavy atom effect enhancing intersystem crossing. The highest hydrogen evolution rate of the system reached 460 mmol/g.h with the presence of iodide ions and a metal co-catalyst. Moreover, the photocatalytic system without any halide ion additives showed remarkable efficiency in hydrogen generation from seawater using stimulated sunlight (apparent quantum yield of about 3.8%).
Article
Nanoscience & Nanotechnology
Seok Woo Lee, M. D. Waseem Hussain, Jihoon Lee, Dong Ryeol Whang, Woo Hyeon Jeong, Hyosung Choi, Dong Wook Chang
Summary: A string of quinoxaline-based polymers systematically decorated with chlorine atoms was created for use in non-fullerene polymer solar cells (PSCs). The addition of chlorine atoms improved the power conversion efficiencies of the PSCs, except when loaded on both the donor and acceptor simultaneously. Optimization of the number and position of chlorine substituents is essential for enhancing the photovoltaic nature of the polymers through synergistic effects between electron-attracting CN and Cl substituents.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Seong Il Kim, Hyeong Ju Kim, Soo Young Park
Summary: In this study, a highly fluorescent zero-dimensional nano-ring supramolecular organic framework (SOF) was designed using CB[8] as the host and a novel bent-shaped cyanostilbene guest. The host-guest complex successfully formed a macrocyclic hexamer and exhibited significantly enhanced fluorescence (phi(F)=68%) compared to the non-assembled monomer (phi(F)=2%). Unlike other SOFs, this 0D SOF could be uniformly dispersed in water without bundling phenomenon.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Applied
Byung Hak Jhun, Soo Young Park, Youngmin You
Summary: Circularly polarized luminescence (CPL) is a unique way of emitting light that can be used for visualizing target analytes. CPL sensors can detect changes in an asymmetric environment by altering the polarization direction, magnitude, or peak wavelength of emitted light.
Article
Chemistry, Physical
Illia E. Serdiuk, Seyoung Jung, Michal Monka, Chi Hyun Ryoo, Soo Young Park
Summary: In the search for high energy organic materials for blue OLEDs, a tunability of the triplet state localized on phenyl-s-triazines (3LE) was discovered. This tunability, achieved by substitution at s-triazine, plays a key role in achieving fast reverse intersystem crossing (rISC) and high external quantum efficiency (EQE) in OLEDs. By using phenyl-s-triazines with high 3LE energies as electron acceptors, a series of blue TADF emitters were developed. However, the enhanced 3LE-1CT interaction was found to be beneficial for ISC but not for rISC, contradicting the three-state model prediction. Instead, the direct 3CT -> 1CT interaction was found to be crucial for rISC and OLED efficiency. It is concluded that enhancing the 3CT -> 1CT transition should be a novel design rule for blue TADF emitters.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Seung Hwa Hong, Seong Il Kim, Dong Won Kim, Soo Young Park
Summary: We propose a high crystallized small-molecule dopant-free hole transporting material (HTM) called DEG-IDIDF, based on the indolo [3,2-b]indole (IDID) core unit integrated with flexible diethylene glycol (DEG) side chains. The DEG side chains contribute to tight molecular packing and high film crystallinity, enhancing hole mobility. The DEG-IDIDF based PSCs have higher power conversion efficiency (16.60%) compared to the commonly used PEDOT:PSS based PSCs (12.04%) under the same inverted PSC structures. Moreover, the DEG-IDIDF based PSCs exhibit outstanding thermal stability with over 80% initial efficiency after 500 hours of thermal stress at 60 degrees C.
ORGANIC ELECTRONICS
(2023)
Article
Chemistry, Physical
Hyunho Park, Illia E. Serdiuk, Soo Young Park
Summary: Designing a metal-free photocatalyst for the photocatalytic hydrogen evolution reaction (HER) is important, but the poor visible light absorption of graphene quantum dots (GQDs) limits their efficiency. By functionalizing GQDs with hexylamine (HA) through the amide bond formation reaction, we synthesized amphiphilic GQD-HA that acts as a photocatalyst and templating surfactant. The composite nanoparticles of GQD-HA and thermally activated delayed fluorescence (TADF) photosensitizers show enhanced stability and HER performance due to efficient charge separation and fast charge transfer.
Article
Materials Science, Multidisciplinary
Seok Woo Lee, Xiangyang Fan, Dong Ryeol Whang, Ji Won Jang, Hyosung Choi, Dong Wook Chang, Bo Ram Lee
Summary: In this study, novel quinoxaline-phosphine oxide small molecules were designed and prepared as the electron transport layer for organic light-emitting diodes (OLEDs). The dipole moments of the molecules were controlled by tuning the end functional group, which resulted in improved device performance. The optimized OLEDs exhibited an external quantum efficiency of 6.12%, demonstrating the potential application of these molecules as next-generation electron transport layers in organic semiconductors.
JOURNAL OF INFORMATION DISPLAY
(2023)
Article
Chemistry, Applied
Seung Hwa Hong, Dong Won Kim, Soo Young Park
Summary: We propose an eco-friendly aqueous process to obtain efficient/stable small molecule organic field effect transistors (OFETs). Penta-ethylene glycol (PEG) side chains were introduced to the rigid backbone structures of indolo[3,2-b]indole(IDID), leading to the formation of PEG-IDIDF. The addition of water as a cosolvent significantly enhances the film crystallinity and molecular stacking orientation of PEG-IDIDF, resulting in improved hole mobility and current on/off ratio for the PEG-IDIDF OFETs processed with ethanol water cosolvent (90:10) ratio.
Article
Chemistry, Physical
Dong Won Kim, Kang-Hoon Choi, Seung Hwa Hong, Hyun-Sik Kang, Ji Eon Kwon, Sungjin Park, Byeong-Kwan An, Soo Young Park
Summary: The development of a new concept of hole transporting materials (HTMs) has led to the advancement of high-performing and stable perovskite solar cells (PSCs). Small molecular organic semiconductors, known for their reproducibility and easy synthesis, have been extensively studied for HTM. This research introduces a novel linear-type series of indoloindole (IDID)-based hole transporting materials, consisting of a fluorinated IDID core (IDIDF) and multiple thiophene rings. The structure-property relationship of the IDIDF derivatives is systematically investigated, resulting in the identification of an optimized material that exhibits improved solubility, favorable molecular packing patterns, and superior hole mobility. The champion PSCs using this optimal molecule, IDIDF2, achieve remarkable thermal and moisture stabilities, making them one of the highest performing n-i-p planar device configurations to date.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Siyang Feng, Liangxuan Wang, Begona Milian-Medina, Alfred J. Meixner, Min Sang Kwon, Soo Young Park, Reinhold Wannemacher, Johannes Gierschner
Summary: The complex photokinetics of donor-acceptor-donor triads with varying flexible spacer lengths were investigated. Both liquid and solid solutions, as well as crystals, were studied using fluorescence spectroscopy and computational analysis. The study revealed dynamic charge-transfer state formation in liquid solutions and fluorescent CT static complexes in solid solutions. It was also found that external stimuli could induce on/off fluorescence switching or change the emission color in films of the triads.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dong Su Shin, Young Jae Park, Jae Hyeon Lee, Ji-Yeon Kim, Hyunbok Lee, Kitae Kim, Yeonjin Yi, Ji Eon Kwon, Kyunam Lee, Soo Young Park, Sang-Youp Yim, Donghee Park, Dong Ick Son
Summary: In the field of organic display devices, the solution process of organic materials still requires further research in order to achieve simple manufacturing processes and flexible characteristics. In this study, we propose novel small-molecule hole-transporting materials, 3PTZ and 3PXZ, for solution-processed polymer light-emitting diodes (PLEDs). The PLEDs with 3PTZ and 3PXZ as hole transport layers (HTLs) showed improved luminance and quantum efficiency compared to the reference PLED without a HTL. The optimized energy band structure of 3PTZ and 3PXZ HTLs exhibited similar performances regardless of the deposition processes.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Dinda Fariesta Nugraha, Danbi Kim, Eunhye Yang, Seok Woo Lee, Dong Ryeol Whang, Sang A. Lee, Sung Heum Park, Dong Wook Chang
Summary: A series of quinoxaline-based D-A-type polymers with electron-withdrawing or electron-donating groups were developed and their impact on photovoltaic efficiency was explored. By modifying the quinoxaline unit of a reference polymer, two objective polymers were obtained with extra fluorine atoms and methoxy units. These polymers demonstrated distinct optical, electrochemical, and morphological features due to the influence of the electron-withdrawing or electron-donating substituents. Furthermore, nonfullerene photovoltaic devices based on these polymers exhibited significantly higher power conversion efficiencies compared to the reference polymer, highlighting the importance of the substituted groups in controlling the intrinsic and photovoltaic attributes of quinoxaline-based polymers.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Electrochemistry
Hyunji Park, Yoshiaki Shuku, Jihyun Lee, Kyunam Lee, Dong Joo Min, Byeong-Kwan An, Kuino Awaga, Soo Young Park, Ji Eon Kwon
Summary: Organic electrode materials are suitable for alkali metal batteries due to their unique redox mechanism and flexible molecular structure. In this study, an ortho-isomer of triptycene tribenzoquinone (o-TT) is presented as a universal organic cathode material for alkali metal batteries. By changing the position of the carbonyl group in the benzoquinone units, the redox potentials of TT are enhanced without sacrificing its large specific capacity. o-TT exhibits high energy densities in Li, Na, and K cells due to multi-electron redox reactions and elevated redox potentials. Finally, the cycle stability of o-TT is significantly improved by fabricating composite electrodes with disordered mesoporous carbon (DOMC).
BATTERIES & SUPERCAPS
(2023)
