Article
Chemistry, Physical
Zhiqi Guo, Yao Tian, Guangjin Dou, Ye Wang, Jiaping He, Hao Song
Summary: A CoP decorated 2D/2D red phosphorus/B doped g-C3N4 heterojunction was synthesized to achieve photocatalytic pure water splitting via a two-electron process. The optimal ternary CoP/RP/BCN photocatalyst exhibited significantly higher H-2 yield compared to g-C3N4, owing to extended light absorption, accelerated charge transfer, and increased active reaction sites. This study proposes a highly effective and sacrificial reagent-free strategy for photocatalytic pure water splitting.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Tong Zhou, Haitang Wei, Bin Xiao, Tianping Lv, Liangfei Duan, Qingjie Lu, Jin Zhang, Yumin Zhang, Qingju Liu
Summary: Photocatalytic water splitting using g-C3N4 as a photocatalyst is a promising strategy for hydrogen production. However, the poor intrinsic activity of g-C3N4 limits its practical application. In this study, a high-performance porous g-C3N4 photocatalyst with anchored Cu single atoms (CuSAs) was synthesized. The obtained Cu1.5-PCN showed an excellent hydrogen evolution rate under visible light, which was significantly higher than that of PCN and bulk g-C3N4. The results suggest that the Cu-N charge bridge in Cu1.5-PCN extends the light absorption band to the visible-light region, contributing to its high performance in solar energy conversion.
Article
Chemistry, Physical
Sivasakthi Sethuraman, Amarnath Marimuthu, Radhakrishnan Kattamuthu, Gurunathan Karuppasamy
Summary: The study showed that Nb doping significantly improved the photocatalytic and gas sensing performance of urea-melamine derived g-C3N4, with 200Nb-UMCN nanosheets exhibiting the best performance. These nanosheets demonstrated high degradation rate, hydrogen production, and gas sensing capability. Additionally, their half-curled worm-like structure showed good structural stability during repeated applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yazi Liu, Xiaojie Li, Huan He, Shaogui Yang, Guohua Jia, Shaomin Liu
Summary: Nanorod-like CoP nanoparticles were synthesized via gas-solid reaction from different precursors of Co(OH)(2) and Co3O4, then embedded into g-C3N4 nanosheets to form intimate heterojunctions. The resulting 0.5% CoP-CN exhibited superior activity in photocatalytic water splitting processes, with reduced over-potentials, more negative photo-reductive potentials, boosted interfacial charge transfer efficiency, and higher solar to hydrogen efficiency. The design of efficient CoP-based heterojunctions on covalent organic framework shows promise for direct water splitting applications utilizing solar energy.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Fahad A. Alharthi, Adel El Marghany, Naaser A. Y. Abduh, Imran Hasan
Summary: A g-C3N4/GdVO4 (CN/GdV) heterostructure was synthesized using a hydrothermal technique for potential energy and environmental applications. Characterization techniques including XRD, SEM, TEM, and XPS showed the distribution of GdV on CN sheets. CN/GdV exhibited high efficiency in hydrogen evolution and degradation of AMR and RR2 dyes compared to pure CN and GdV. The enhanced activity was attributed to the type-II heterostructure and reduced charge carrier recombination.
Article
Chemistry, Physical
Hongmei Chen, Yanyun Fan, Zheng Fan, Hongyan Xu, Danfeng Cui, Chenyang Xue, Wendong Zhang
Summary: This study introduces a competitive coordination strategy to significantly improve the electron and band structure of g-C3N4, enhancing the hydrogen evolution performance. The modified catalyst shows 3.7 or 9.6 times higher hydrogen generation rates at wavelengths above 400 nm and 420 nm, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yixuan Wang, Jianpeng Sun, Yuan Yao, Zizhen Li, Xiangchao Meng
Summary: In this study, g-C3N4 nanosheets were successfully synthesized and different metal nanoparticles were deposited on their surface, significantly enhancing the photocatalytic hydrogen production activity. Pt-loaded g-C3N4 nanosheets exhibited the highest hydrogen production activity, and the maximum hydrogen production rate was achieved under external bias. The research discussed and explained the enhancement mechanism in detail.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Kelei Huang, Chunhu Li, Xiuli Zhang, Liang Wang, Wentai Wang, Xiangchao Meng
Summary: Delaminated 2D Ti3C2 MXene nanosheets were used to decorate P-doped tubular g-C3N4, forming a 1D/2D Schottky heterojunction. The optimized composite showed significantly enhanced photocatalytic activity for hydrogen evolution compared to pristine g-C3N4 and PTCN. The enhancement was attributed to the phosphorus doping, unique structure of the heterojunction, and the separation and inhibition of charge carriers. Metallic Ti3C2 acted as an electron sink and photon collector, while the ultrathin Ti3C2 flake served as a co-catalyst for higher reactivity.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Engineering, Electrical & Electronic
Ao Li, Zhijian Peng, Xiuli Fu
Summary: The prompt recombination between photogenerated electrons and holes is a common problem in improving the hydrogen evolution performance of a photocatalyst, which can be greatly solved by composite co-catalysis. In this study, a simple hydrothermal reaction was used to prepare g-C3N4/Ni9S8 composite photocatalysts, leading to a significant increase in hydrogen evolution rate under visible light irradiation compared to raw g-C3N4. The mechanism for the hydrogen evolution reaction over the g-C3N4/Ni9S8 composite photocatalysts was also discussed in detail.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
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
Materials Science, Multidisciplinary
Mahshid Farahi, Fariba Fathirad, Tayebeh Shamspur, Ali Mostafavi
Summary: In this work, WS2 and g-C3N4 monolayers were synthesized and used to prepare WS2/g-C3N4 nanostructures through a two-step process. Graphene oxide nanoribbons were synthesized and applied to prepare three-component gC(3)N(4)/WS2@rGONR(x) nanocomposites. The synthesized nanocomposites were evaluated using various characterization techniques, and it was found that g-C3N4/WS2@rGONR(2) photocatalyst exhibited the best catalytic performance and stability in the hydrogen evolution reaction.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Vu Quang Hieu, Truong Chi Lam, Afrasyab Khan, Thu-Thao Thi Vo, Thanh-Quang Nguyen, Van Dat Doan, Dai Lam Tran, Van Thuan Le, Vy Anh Tran
Summary: The research utilized the titanium atom from Ti3C2 MXene to develop TiO2, forming a close heterostructure with semiconductors, while the high surface area of amorphous g-C3N4 contributed to light harvesting during photocatalytic activity. The optimized TTC-450 heterostructure demonstrated a higher H-2 generation efficiency compared to pure g-C3N4 and other samples.
Article
Chemistry, Physical
Himanshu Bhatt, Tanmay Goswami, Dharmendra Kumar Yadav, Nandan Ghorai, Ayushi Shukla, Gurpreet Kaur, Arshdeep Kaur, Hirendra N. Ghosh
Summary: A g-C3N4(CN)/ZnIn2S4 (ZIS) heterostructure was synthesized and a direct correlation between excited-state charge carrier dynamics and enhanced photocatalytic activity was established using ultrafast transient absorption (TA) spectroscopy. The study showed the dominance of hot electron transfer and the migration of photogenerated hot electrons from CN towards ZIS, contributing to enhanced photocatalytic H-2 evolution. This work highlights the potential of CN/ZIS heterostructures in improving photocatalytic performance and presents a new pathway for advancing photocatalytic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yufeng Pan, Bin Xiong, Zha Li, Yan Wu, Chunjie Yan, Huaibin Song
Summary: The photocatalytic hydrogen evolution was enhanced by in situ constructing oxygen-vacancy-rich MoO3-x/porous g-C3N4 heterojunctions and optimizing the MoO3-x precursor content. The presence of oxygen vacancies and high porosity induced more active sites, leading to efficient charge separation and enhanced photocatalytic performance for hydrogen evolution.
Review
Chemistry, Multidisciplinary
Yupeng Xing, Xiaoke Wang, Shuhua Hao, Xueli Zhang, Xiao Wang, Wenxuan Ma, Gang Zhao, Xijin Xu
Summary: g-C3N4 is widely used in photocatalytic applications such as hydrogen production, dye degradation, and toxic gas oxidation due to its excellent performance. Its efficient photocatalytic capacity has attracted extensive attention and research interest. The material's modification enhances its performance, making it a promising candidate for industrial applications in the future.
CHINESE CHEMICAL LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Tapas K. Das, Tapan Ping, Manoj Mohapatra, Shahid Anwar, Chinnakonda S. Gopinath, Bikash Kumar Jena
Summary: A one-step hydrothermal reaction was developed to synthesize Ni-doped ReS2 nanostructure with sulphur defects. The material exhibited excellent OER activity, low Tafel slope, and good long-term durability. The high faradaic efficiency was attributed to the synergistic effect of Ni-in and S-out on the ReS2 nanostructure.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Praveen Kumar, Himanshu Bajpai, Chinnakonda S. Gopinath, Meitram Niraj Luwang
Summary: The advanced strategy of opening epoxide rings on the graphene oxide surface with nucleophiles, and subsequent functionalization to obtain four-membered rings, was reported in this study. The Cd-coordination with sulfur atoms resulted in the cleavage of the C-C bond in the four-membered heteroatomic rings, leading to the fabrication of innovative MOBOT chemical moieties. The MOBOT compounds showed enhanced H-2 generation activity and have potential applications as photocatalysts for solar hydrogen generation and optoelectronics.
INORGANIC CHEMISTRY
(2022)
Article
Energy & Fuels
Bindu Antil, Lakshya Kumar, Manash R. Das, Sasanka Deka
Summary: This study developed an efficient flexible supercapacitor with high capacity, energy density, and stability. The use of a unique g-C3N4.7/N-doped graphene nanocomposite as the electrode material, along with a redox active electrolyte cum separator, resulted in high performance. Tests on bending angles showed that the capacitor maintained stable capacity at any angle.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
Dong-Eun Lee, Kasala Prabhakar Reddy, Satyanarayana Moru, Wan-Kuen Jo, Surendar Tonda
Summary: Crystal facet engineering has been used to improve photocatalyst performance by promoting charge transfer and separation. This study successfully fabricated a WOAT@PCN hybrid photocatalyst with enhanced degradation properties and stability. The research highlights the importance of crystal facet engineering for various photocatalytic applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Inderjeet Chauhan, Kshirodra Kumar Patra, Himanshu Bajpai, Nitin B. Mhamane, Kranti N. Salgaonkar, Chinnakonda S. Gopinath
Summary: Co-doping into the BiVO4 lattice enhances the kinetics and sustainability of chlorine evolution reaction (CER), leading to selective CER at a low operating potential. The best-performing photoanode, with 0.05 mol% Co doping, selectively produces active chlorine with high faradaic efficiency and demonstrates stability for up to 20 hours.
DALTON TRANSACTIONS
(2023)
Review
Chemistry, Inorganic & Nuclear
Sasanka Deka
Summary: Supercapacitors have various applications in daily life and are crucial in supplementary electrochemical energy storage technologies along with batteries and fuel cells. They are used as power sources in portable electronics, automobiles, power backup, medical equipment, and more. This review focuses on the synthesis and electrochemical energy storage behavior of morphology-oriented transition metal oxide and mixed transition metal oxide nanoparticles, as well as the development of flexible and bendable supercapacitor devices based on these mixed transition metal oxides.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Ankur Kumar, Javed Muhommad, Siddhartha K. Purkayastha, Ankur K. Guha, Manash R. Das, Sasanka Deka
Summary: A newly developed transition metal boron amorphous alloy electrocatalyst can improve the efficiency of electrochemical water splitting by reducing the energy consumption of the oxygen evolution reaction (OER).
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Kasala Prabhakar Reddy, Daeho Kim, Seunghwa Hong, Ki-Jeong Kim, Ryong Ryoo, Jeong Young Park
Summary: Modifying the electronic structure of nickel-based catalysts is a promising strategy to tune the selectivity of CO2 hydrogenation. In this study, well dispersed Cu-Ni bimetallic nanoparticles were synthesized and used for selective CO2 hydrogenation. The Cu0.5Ni0.5/gamma-Al2O3 catalyst exhibited higher CO2 conversion and CO selectivity compared to monometallic catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Ravi Ranjan, Jyoti Tekawadia, Ruchi Jain, Nitin B. Mhamane, Thirumalaiswamy Raja, Chinnakonda S. Gopinath
Summary: The main challenges in heterogeneous catalytic CO2 reduction are to minimize H2 consumption while maximizing CO2 conversion, and to enhance CO selectivity while reducing methane production. Co3O4 spinel has been found to be a potential catalyst with high CO selectivity at atmospheric pressure. The current work demonstrates sustainable CO2 conversion to 100% CO selectivity using Co3O4 nanocubes, with increased CO selectivity and yield at the cost of methane.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Ankur Kumar, Siddhartha K. Purkayastha, Ankur K. Guha, Manash R. Das, Sasanka Deka
Summary: A nanoarchitecture composed of NiCu alloy on Co nanosheets was developed and used as an efficient electrocatalyst for HER, OER, and overall water splitting. The optimized catalyst displayed excellent activities with low overpotentials, Tafel slopes, and high mass activities, turnover frequencies, and exchange current densities. It achieved a current density of >1000 mA cm(-1) at low voltage in the electrolyzer, surpassing the commercial IrO2||Pt/C catalyst. The proposed mechanisms were supported by experimental and computational studies, revealing the involvement of nanoporous Cu-rich alloy and (100) surface exposed Co nanosheets as active sites for HER and OER, respectively.
Article
Chemistry, Physical
Nitin B. B. Mhamane, Suresh Panchal, Sadhu K. K. Kolekar, Ravi Ranjan, Kranti N. N. Salgaonkar, Anand S. S. Burange, Naresh Nalajala, Suwarna Datar, Chinnakonda S. S. Gopinath
Summary: The present study demonstrates the effect of temperature-dependent surface modification (SM) treatment on Pd-TiO2 catalysts, which broadens the catalysis regime by shifting the onset of CO oxidation activity to lower temperatures. The SM process induces changes in the surface properties, such as work function, surface potential, and catalytic activity. XPS, UPS, and AFM techniques were used to investigate the SMd Pd-TiO2 catalysts, and it was found that diffusion of atomic oxygen into the subsurface layers of Pd led to significant surface modification. The changes in work function (& phi;) were correlated with the observed changes in catalytic activity. Additionally, the surface potential was found to increase linearly with increasing SM temperature up to 523 K. These findings suggest that the work function can serve as a global marker for chemical reactivity.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Dharmendra Kumar Yadav, Javed Muhommad, Sasanka Deka
Summary: A two-step synthetic strategy was developed to produce porous nanostructured ZnCoNi-LDH nanosheets from bimetallic MOFs through a chemical reduction method. The optimized composition exhibited the best charge storage ability and specific capacitance. After 10,000 continuous charge-discharge cycles, the device retained 86% of its capacitance and delivered a high-capacitance-specific Coulombic efficiency.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Kranti N. Salgaonkar, Himanshu Bajpai, Nitin B. Mhamane, Naresh Nalajala, Inderjeet Chauhan, Kavita Thakkar, Kavita Joshi, Chinnakonda S. Gopinath
Summary: The article discusses the research on achieving artificial photosynthesis for liquid fuels with improved solar-to-fuel efficiency. The use of BiVO4 quantum dots integrated with TiO2 showed promising results in terms of charge separation and utilization, leading to a high photon to chemical conversion turn over frequency. The study also demonstrated the scalability and sustainability of the technology.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Kshirodra Kumar Patra, Chinnakonda S. Gopinath
Summary: This study discusses the impact of catalyst material, electrolyte, and gas diffusion electrode on the CO2RR in a gas-fed flow cell. It emphasizes the need for promising catalysts with a partial current density of >= 100 mA cm(-2) and high faradaic efficiency for scale-up requirements. The study also lists additional experimental hurdles and their potential solutions, as well as the best available protocols for data acquisition for catalyst activity evaluation.
CHEMICAL COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Lakshya Kumar, Bindu Antil, Ankur Kumar, Manash R. Das, Omar Lopez-Estrada, Samira Siahrostami, Sasanka Deka
Summary: In this study, novel nonprecious transition-metal phosphide nanoparticles were developed as efficient electrocatalysts for hydrogen and oxygen evolution reaction and overall water splitting. The surface chemistry of these nanoparticles was explored to understand the reaction mechanism. The optimized catalyst exhibited attractive catalytic activities and durability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
