Review
Chemistry, Physical
Yash Rajput, Parveen Kumar, Tian C. Zhang, Dinesh Kumar, Meena Nemiwal
Summary: This review presents the recent advances in g-C3N4-based photocatalysts for hydrogen evolution reactions (HER), including the design and engineering of doped-g-C3N4, composites of g-C3N4, and engineered-g-C3N4. The characteristics and advantages of g-C3N4-based heterojunctions are analyzed, and current challenges and future perspectives are discussed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Environmental Sciences
Haeju Kim, Dawoon Jang, Seungjoo Choi, Jeongho Kim, Sungjin Park
Summary: The activation with nitric acid improves the photocatalytic activity of 3D melamine-derived C3N4 materials in degrading organic pollutants. NT-MCN shows better charge transfer ability compared to MCN.
Review
Chemistry, Physical
Zhuangfei Qian, Zi Jun Wang, Kai A. Zhang
Summary: This review summarizes the recent developments in Covalent triazine frameworks (CTFs) as a new class of visible light-active, metal-free, and polymer-based heterogeneous photocatalysts. It discusses various physical and chemical design strategies for morphology, band structure, charge separation, and transfer optimization that directly impact their photocatalytic efficiency, with emphasis on enhancing and maximizing the efficiency for specific applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jiangyun Zhao, Simon De Kreijger, Ludovic Troian-Gautier, Jin Yu, Wenhui Hu, Xiaoyi Zhang, Benjamin Elias, Dooshaye Moonshiram
Summary: Picosecond optical and X-ray absorption spectroscopies coupled with time-dependent density functional theory have revealed the reaction pathways, electronic and structural conformations of Ir-Co hydrogen evolution photocatalysts. The dyad with 2-phenylpyridine ancillary ligands produces more photo-reduced Co(ii) compared to its 2-phenylisoquinoline analogue. These findings are significant for the design of earth-abundant photosensitizers for photocatalytic applications.
CHEMICAL COMMUNICATIONS
(2022)
Review
Chemistry, Physical
Sijie Lv, Chunxiao Wu, Yun Hau Ng, Yafei Zhang, Jiahuan Peng, Yuxi Liu, Qichao Zhang, Shuang Li, Yajie Sun, Lin Jing, Jiguang Deng, Hongxing Dai
Summary: This review provides a comprehensive overview of the phosphorus-modified graphitic carbon nitride (g-C3N4) photocatalysts, and summarizes the physical-chemical structure-activity relationship and improvement mechanism between g-C3N4 and phosphorus. P elemental doping, composite with elemental P, and the addition of metal phosphide as cocatalysts are commonly used modification methods to enhance photocatalytic activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Dawoon Jang, Suyeon Lee, Nam Hee Kwon, Taehoon Kim, Sangjoon Park, Kyung Yeon Jang, Eojin Yoon, Seungjoo Choi, Juheon Han, Tae-Woo Lee, Jeongho Kim, Seong-Ju Hwang, Sungjin Park
Summary: In this work, one-dimensional P-doped carbon nitride nanotubes have been successfully synthesized using supramolecular self-assembly. These nanotubes exhibit great potential as an eco-friendly, visible-light-active photocatalyst for hydrogen evolution reaction. The addition of an ionic liquid improves the uniformity of the nanotubes. Thorough structural and photophysical characterizations reveal that the nanotubes possess larger surface areas, more amine bridges, better crystallinity, and higher visible-light-absorption ability, which contribute to their enhanced photocatalytic performance.
Review
Chemistry, Physical
Thang Phan Nguyen, Il Tae Kim
Summary: This review discusses the application of single-atom transition metals as photocatalysts in a solar-powered water-splitting system that produces hydrogen gas. The synthesis methods, reaction mechanism, current performance, and main challenges and improvement strategies of these materials are exhaustively discussed.
Article
Chemistry, Physical
Dawoon Jang, Seungjoo Choi, Suyeon Lee, Tae-Woo Lee, Seong-Ju Hwang, Hyungjun Kim, Jeongho Kim, Sungjin Park, Nam Hee Kwon, Kyung Yeon Jang
Summary: This study presents a water-assisted method to enhance the photocatalytic activities of carbon nitride by controlling intraplanar structures associated with H bonds and amine bridges.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Dariusz Mitoraj, Igor Krivtsov, Chunyu Li, Ashwene Rajagopal, Changbin Im, Christiane Adler, Kerstin Koble, Olena Khainakova, Julian Hniopek, Christof Neumann, Andrey Turchanin, Ivan da Silva, Michael Schmitt, Robert Leiter, Tibor Lehnert, Jurgen Popp, Ute Kaiser, Timo Jacob, Carsten Streb, Benjamin Dietzek, Radim Beranek
Summary: The study utilizes a high-temperature treatment method to transform conventional melamine-derived yellow PCN into red carbon nitride, introducing a new functionality that promotes visible light absorption and expands the light absorption range of PCN materials.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Energy & Fuels
Junzhuo Li, Zhaohui Ruan, Lei Zhu, Yudong Li, Xianzhu Xu, Yulin Yang, Yuan Yuan, Kaifeng Lin
Summary: Heteroatoms doping and morphology design are effective ways to enhance the photocatalytic activity of graphitic carbon nitride (g-C3N4). A porous g-C3N4 sphere codoped with K and I showed significantly improved catalytic activity, with the synergistic effect of codoping and the porous structure enhancing light absorption and carrier separation capabilities during photocatalysis. Experimental results and optical simulations confirmed the benefits of the codoping of metal and nonmetal elements in enhancing photocatalytic performance.
Article
Chemistry, Physical
Wenkang Xu, Xiaoyao Li, Chao Peng, Guangxing Yang, Yonghai Cao, Hongjuan Wang, Feng Peng, Hao Yu
Summary: MXenes, 2D transition metal carbides/nitrides, have shown great potential in fabricating novel composites with interesting photo-/electrochemical properties. A one-pot hydrothermal synthesis method for MXene-based photocatalyst was successfully validated, utilizing the reducibility of Nb2CTx MXene. The chemical valance of the noble metal Ru/Pt obtained by this method was closer to the metal state, significantly reducing the charge transfer resistance and leading to efficient photocatalytic hydrogen production.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Materials Science, Multidisciplinary
Xinze Li, Qiong Liu, Jiliang Ma, Kangning Liu, Zhendong Liu, Runcang Sun
Summary: The RuP2/Ti4P6O23@TiO2-7 photocatalyst was successfully constructed for efficient photocatalytic hydrogen evolution and high selectivity biomass conversion. It exhibited a fast photo-generated carrier rate and wide visible light absorption range due to the in situ incorporated RuP2 and Ti4P6O23. The hydrogen evolution achieved 16.3 mmol g(-1) h(-1) accompanied by lactic acid production.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Ramesh Chandra Sahoo, Haijiao Lu, Dimple Garg, Zongyou Yin, H. S. S. Ramakrishna Matte
Summary: A copolymerization strategy was employed to synthesize g-C3N4 with a narrow bandgap, and composites of g-C3N4 and reduced graphene oxide (rGO) were prepared as catalysts. These composite catalysts exhibited selective photoreduction of CO2 to methanol, along with good stability under scavenger-free conditions.
Article
Biotechnology & Applied Microbiology
Fanpeng Meng, Zhihao Tian, Wenjie Tian, Huayang Zhang
Summary: This review summarizes the recent developments of g-C3N4-supported single-atom photocatalysts for hydrogen evolution, highlighting the metal-support interactions and structure regulations for stable and efficient catalysis. The difficulties and potentials for future development of g-C3N4-supported single-atom materials in photocatalytic hydrogen evolution are proposed.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Danila Vasilchenko, Angelina Zhurenok, Andrey Saraev, Evgeny Gerasimov, Svetlana Cherepanova, Sergey Tkachev, Pavel Plusnin, Ekaterina Kozlova
Summary: A highly active Pt/g-C3N4 photocatalyst was successfully prepared by successive combination of thermolysis, chemisorption, and reductive treatment. The prepared material showed remarkable photocatalytic activity in hydrogen evolution reaction, with a high rate of H-2 evolution per platinum atom loaded and among the highest reported net rates to date. The unique structure of the material, with a branchy net of pores, facilitated efficient access of reagents and expulsion of products, leading to the excellent performance. The self-catalyzed hydrogenation of the Pt/g-C3N4 composites played a crucial role in the formation of the noted morphology. The study demonstrated the potential of this approach for large-scale applications in hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Haeju Kim, Dawoon Jang, Seungjoo Choi, Jeongho Kim, Sungjin Park
Summary: The activation with nitric acid improves the photocatalytic activity of 3D melamine-derived C3N4 materials in degrading organic pollutants. NT-MCN shows better charge transfer ability compared to MCN.
Article
Chemistry, Multidisciplinary
Minseon Choi, Suyeon Lee, Dawoon Jang, Sungjin Park
Summary: Electrochemical water splitting is an important process for eco-friendly energy systems. This study develops a hybrid material (Fe-NC) consisting of Fe3C particles dispersed on the surface of N-doped carbon (NC) materials, which shows good electrocatalytic properties for the oxygen evolution reaction (OER). The study suggests the possibility of using Fe3C-based composites as OER electrocatalysts.
Article
Engineering, Environmental
Seung Ho Yook, Ho Young Kim, Seok Jun Kim, Seungjoo Choi, Taehyun Kwon, Handong Cho, Jun Myung Kim, Ki Ro Yoon, Sunhee Jo, So Young Lee, Hyoung-Juhn Kim, Hae Jung Son, Keun Hwa Chae, Jeongho Kim, Kwan Young Lee, Jin Young Kim
Summary: This study investigates the effect of chemically durable mesoporous silica shell on the antioxidation efficiency of CeOx nanomaterials. It is found that the mSiO2 shell can enhance the antioxidation efficiency of CeOx by facilitating dispersion of nanoparticles and increasing the ratio of highly active Ce(III) states. Proton exchange membranes based on CeOx/mSiO2 also exhibit lower degradation rate and excellent durability in energy conversion devices.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Hyunhong Kim, Seung Ho Yook, Ho Young Kim, Yonghoon Choi, Yeongsu Lim, Yujin Hwang, Jeongho Kim, Kwan Young Lee, Seung Soon Jang, Jongnam Park, Jin Young Kim
Summary: This study reports on the surface-engineered cerium oxide nanoparticles (CNPs) that enhance the antioxidant properties and durability of polymer electrolyte membrane fuel cells (PEMFCs). The researchers also found that negatively charged CNPs with sulfonic acid groups as the surface modifier showed the highest compatibility with the polymer electrolyte membrane, resulting in improved stability and performance of the fuel cell.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Dawoon Jang, Seungjoo Choi, Suyeon Lee, Tae-Woo Lee, Seong-Ju Hwang, Hyungjun Kim, Jeongho Kim, Sungjin Park, Nam Hee Kwon, Kyung Yeon Jang
Summary: This study presents a water-assisted method to enhance the photocatalytic activities of carbon nitride by controlling intraplanar structures associated with H bonds and amine bridges.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Suyeon Lee, Eun Young Shin, Dawoon Jang, Seungjoo Choi, Hyeju Park, Jeongho Kim, Sungjin Park
Summary: Degradation of organic pollutants is an important research area to solve environmental issues. Metal-free carbon nitride (C3N4) materials have a great potential as cost-effective and environment-friendly photocatalysts for this purpose. In this study, mesoporous C3N4 materials were developed through self-assembly and showed excellent photocatalytic activities for degrading rhodamine B under visible light irradiation. These materials exhibited higher surface areas, better adsorption ability of visible light, and longer lifetimes of the photoexcited electrons compared to common C3N4 samples, which contribute to their outstanding photocatalytic performance.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Dawoon Jang, Seokhyeon Jeon, Eun Young Shin, Sungjin Park
Summary: Polymeric carbon nitride (p-C3N4) is a promising metal-free photo-catalyst produced through thermal poly-condensation. Two p-C3N4 materials, UCN-A and UCN-N, were obtained by heat treatment of urea under different gaseous conditions. The UCN-A exhibited better photocatalytic activity than UCN-N due to its more porous structures and larger surface areas.
Article
Chemistry, Multidisciplinary
In Seok Yang, You Jin Park, Yujin Hwang, Hoi Chang Yang, Jeongho Kim, Wan In Lee
Summary: Li-doped CuSCN films act as hole-transporting materials in perovskite solar cells, showing improved crystallinity and hole mobility. The addition of a small amount of PCPDTBT further enhances the performance and stability of the solar cells.
Article
Chemistry, Physical
Key Young Oang, Sungjun Park, Jiwon Moon, Eunji Park, Hyun Kyung Lee, Tokushi Sato, Shunsuke Nozawa, Shin-ichi Adachi, Joonghan Kim, Jeongho Kim, Jeong-Hun Sohn, Hyotcherl Ihee
Summary: Time-resolved X-ray liquidography (TRXL) is a powerful technique for studying the structural dynamics of small molecules and macromolecules in liquid solutions. However, it has limited sensitivity for small molecules containing light atoms only, making the signal from solvent molecules dominate. This study presents an alternative approach using solvent temperature change to detect the dynamics of photoinduced reactions, allowing the identification of intermediates and reaction pathways in small molecules without heavy atoms.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Yu-Na Kim, Ju-Hee Jo, Jeongho Kim, Hui-Seon Kim, Wan In Lee
Summary: Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is commonly used as a dopant in 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluor-ene (spiro-MeOTAD), but it results in poor thermal stability. Recently, zinc(II) bis(trifluoromethanesulfonyl)imide (Zn(TFSI)2) has been proposed as a potential replacement for LiTFSI. This study explores the use of Zn(TFSI)2 as a dopant for spiro-MeOTAD to investigate the thermal stability of perovskite solar cells (PSCs).
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Nam Hee Kwon, Jihye Park, Xiaoyan Jin, Se-Jun Kim, Hyungjun Kim, Seong-Ju Hwang
Summary: Defect engineering can enhance the photocatalytic activity of two-dimensional superlattice catalysts. The defect-optimized g-C3N4-TiO2 superlattice exhibits higher photocatalytic performance in visible-light-induced N-2 fixation. The high photocatalytic activity of g-C3N4-TiO2 is attributed to hybridization-induced defect creation, facilitated hydrogenation of adsorbed nitrogen, and improvement in N-2 adsorption and charge transport.
Article
Chemistry, Multidisciplinary
Hosung Ki, Tae Wu Kim, Jiwon Moon, Jungmin Kim, Yunbeom Lee, Jun Heo, Kyung Hwan Kim, Qingyu Kong, Dmitry Khakhulin, Gemma Newby, Joonghan Kim, Jeongho Kim, Michael Wulff, Hyotcherl Ihee
Summary: The photoactivation mechanism of Os-3(CO)(12) at 400 nm was investigated using time-resolved X-ray liquidography, revealing two pathways: vibrational relaxation following internal conversion and ligand dissociation to form Os-3(CO)(11) with a ligand vacancy.
CHEMICAL COMMUNICATIONS
(2022)
