Article
Chemistry, Multidisciplinary
Antonia Kagkoura, Hiram Joazet Ojeda-Galvan, Mildred Quintana, Nikos Tagmatarchis
Summary: Highly performing non-metal inexpensive electrocatalysts are needed for hydrogen production. Carbon dots (CDs) with large specific surface area, low cost, high conductivity, and rich functional groups, as well as conductive substrates, show promise as non-metal electrocatalysts. In this study, a unique 3D superstructure of carbon nanohorns (CNHs) is used as a conductive support for CDs, promoting charge transfer and accelerating hydrogen evolution. The all-carbon non-metal CDs/CNHs nanoensemble exhibits similar performance to Pt/C in onset potential, low charge transfer resistance, and excellent stability.
Review
Nanoscience & Nanotechnology
Amr Radwan, Huihui Jin, Daping He, Shichun Mu
Summary: The significant progress of MOFs-derived electrocatalysts in ORR, OER, and HER applications is mainly attributed to their high-porosity structure, large surface area, and abundant active centers.
NANO-MICRO LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Zhen Zhang, Peizhi Liu, Yanhui Song, Ying Hou, Bingshe Xu, Ting Liao, Haixia Zhang, Junjie Guo, Ziqi Sun
Summary: This review summarizes the recent progress of 2D superlattice materials in electrocatalysis applications, focusing on the rational design and fabrication of 2D superlattices, as well as their specific applications in electrocatalysis. The challenges and strategies for the future design of 2D superlattice materials are also outlined.
Review
Chemistry, Multidisciplinary
Ge Li, Ping Wang, Miao He, Xilin Yuan, Lulin Tang, Zhenxing Li
Summary: The localization and incomplete filling of 4f electrons enable cerium to have great potential in electrocatalysis and photocatalysis. The unique 5d empty orbital of cerium can act as a hydrogen trap site, facilitating hydrogen recombination and promoting hydrogen molecule desorption in electrocatalysis. Additionally, cerium-based nanomaterials have stable crystal structures, excellent oxygen mobility, and good optical properties, making them highly desirable for photocatalytic applications. This review summarizes the preparation methods of cerium-based nanomaterials and discusses their applications in electrocatalysis and photocatalysis, providing a promising prospect for their use in these fields.
SCIENCE CHINA-CHEMISTRY
(2023)
Review
Chemistry, Multidisciplinary
Bin Wu, Haibing Meng, Dulce M. Morales, Feng Zeng, Junjiang Zhu, Bao Wang, Marcel Risch, Zhichuan J. Xu, Tristan Petit
Summary: Nitrogen-doped carbons are a rapidly growing class of materials for oxygen electrocatalysis, offering low cost, environmental friendliness, excellent conductivity, and scalable synthesis. They have the potential to replace precious metal-based electrocatalysts and reduce costs in energy conversion and storage systems.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Environmental
Xiaoran Zhang, Yunqiu Wang, Kun Wang, Yilin Huang, Dandan Lyu, Feng Yu, Shuangbao Wang, Zhi Qun Tian, Pei Kang Shen, San Ping Jiang
Summary: In this study, N, S co-doped graphene nanosheets were synthesized effectively by pyrolysis of a mixture of 2,6-diaminopyridine as N source and ammonium persulfate as S source. By tuning the ratio of graphitic-N and thiophenic-S dopants in the nanosheets, the active sites were engineered to achieve optimized intermediates energy for three-reaction pathways, leading to enhanced electrocatalytic activity and selectivity for water-cycled reactions such as HER, OER, and ORR.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Yumei Chen, Jiahong Niu, Yanfei Pei, Haoqiang Song, Yanping Fan, Siyu Lu, Baozhong Liu
Summary: Composite catalysts Pd/B,N-CDs@CNT were designed by immobilizing Pd nanoparticles on a hybrid support composed of B,N-doped carbon dots (B,N-CDs) and multi-wall carbon nanotubes (CNT). The Pd nanoparticles showed clean surface, low crystallinity, and surface distortion. The catalyst exhibited significantly enhanced oxygen reduction reaction (ORR) activity, about 5-6 times higher than commercial Pt/C, mainly attributed to the unique microstructure of Pd nanoparticles. The composite B,N-CDs and doped B,N heteroatoms further improved the ORR performance through more absorption sites, facilitating electron transfer, promoting adsorption of oxygenated species, and weakening the interaction between Pd and C.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Electrochemistry
Joseph Cirone, Jesse S. Dondapati, Aicheng Chen
Summary: This study presents the synthesis of bimetallic quantum dot electrocatalysts comprised of nickel and iron and their effects on the catalytic activity, with the Ni:Fe ratio optimized for enhanced efficiency. The optimal composition of NiFe QD electrocatalysts was found to be 54.9% Ni and 25.3% Fe for OER and HER, respectively, showing promising potential for efficient hydrogen production.
ELECTROCHIMICA ACTA
(2021)
Review
Chemistry, Multidisciplinary
Jianan Su, Linzhou Zhuang, Shusheng Zhang, Qingju Liu, Longzhou Zhang, Guangzhi Hu
Summary: Single atom catalyst (SAC) is a novel catalyst with high atomic availability, specific activity, and pathway selectivity. This article summarizes the classification, preparation, characterization, and application of single atom catalysts, and discusses the current bottlenecks and future outlooks of SAC research.
CHINESE CHEMICAL LETTERS
(2021)
Article
Chemistry, Physical
Qing Shi, Hantao Liu
Summary: In this study, a high efficient and stable HER catalyst of Ru@CNF was designed and prepared through a simple adsorption and pyrolysis method, showing superior activity and stability compared to other Ru-based and transition metal catalysts. This work provides a low-cost, simple, and feasible method for fabricating HER catalyst with commercial application prospects in the field of producing hydrogen by water electrolysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Kiran P. Shejale, Yogeshwaran Krishnan, Ranjith Kumar Dharman, Yeon Uk Jeong, Sung Yeol Kim
Summary: Multifunctional electrocatalysts with excellent performance are highly desirable for new energy technologies. An electrocatalyst is synthesized using a straightforward two-step approach, whereby ultralow doping (0.06 wt%, Fe) and a heteroatom (N) generate defects. The defect-induced active sites and porous channels enable high catalytic activity and durability for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).
MATERIALS & DESIGN
(2023)
Review
Chemistry, Physical
Moises A. de Araujo, Andrey A. A. Koverga, Alan M. P. Sakita, Felipe B. B. Ometto, Leticia G. da Trindade, Edson A. A. Ticianelli
Summary: The review provides a comprehensive account of recently reported strategies to enhance the electrocatalytic reduction of O-2, CO2, and water on M-N-C catalysts, as well as discusses the latest theoretical studies based on computer modelling and simulation. It aims to offer an in-depth understanding of these reactions and provide future perspectives for guiding new research.
Article
Chemistry, Physical
Dan Wang, Sitan Li, Xiaoxin Zhang, Bo Feng, Yan Pei, Yunfeng Zhu, Wei Xu, Zhen-Hua Li, Minghua Qiao, Baoning Zong
Summary: In this study, a slightly nitrogen-doped carbon catalyst was synthesized using a simple method. The catalyst showed low overpotential and high selectivity in producing H2O2 in an acidic electrolyte, and stable H2O2 production was achieved. The relationship between the surface content of C-O/C-N and C=O species and the H2O2 partial current suggested that C atoms act as active sites for 2e-ORR to H2O2. The catalyst, with its inexpensive starting materials and excellent catalytic performance, may contribute to the development of an affordable, safe, and direct electrochemical process for O2-to-H2O2 conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Nanoscience & Nanotechnology
Yuyang Wang, Yaping Gao, Lixia Ma, Yanzhong Xue, Zong-Huai Liu, Huali Cui, Nan Zhang, Ruibin Jiang
Summary: In this study, Fe-N4-C and NiFe-LDH clusters were successfully integrated into a NiFe-LDH/Fe,N-CB electrocatalyst. The electrocatalyst showed excellent bifunctional activity for the oxygen reduction reaction and the oxygen evolution reaction, making it suitable for large-scale commercialization of rechargeable Zn-air batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Wenxian Liu, Jinxiu Feng, Ruilian Yin, Yifeng Ni, Dong Zheng, Wenbin Que, Xinxin Niu, Xiaojing Dai, Wenhui Shi, Fangfang Wu, Jintao Yang, Xiehong Cao
Summary: The study introduces a new method for efficient production of H2O2 by tailoring the surface structure and coordination environment of cobalt-carbon hybrids to achieve high 2e(-) selectivity. The CoNCF electrodes synthesized exhibit excellent H2O2 selectivity in acidic media, showing potential practical applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Jayasmita Jana, Seung Hyun Hur
Summary: Nitrogen-doped carbon dots with tunable fluorescence properties were synthesized hydrothermally in aqueous media. The emission peaks showed a blue shift upon dilution, and interaction with metal cations caused quenching. The one-pot detection of metal ions and ascorbic acid was designed through re-absorption phenomenon and exposure of surface functional groups.
Article
Chemistry, Analytical
Yen-Linh Thi Ngo, Phi Luan Nguyen, Jayasmita Jana, Won Mook Choi, Jin Suk Chung, Seung Hyun Hur
Summary: A new strategy for sensing hydrogen peroxide (H2O2) and glucose using metal oxide-carbon dot hybrid structure was investigated. The sensing system showed high accuracy in detecting H2O2 and glucose and could be applied for on-site analysis of glucose without the use of a spectrometer.
ANALYTICA CHIMICA ACTA
(2021)
Article
Chemistry, Applied
Linlin Wang, Jayasmita Jana, Jin Suk Chung, Seung Hyun Hur
Summary: Water-soluble N-doped carbon dots (NCDs) were designed by hydrothermal treatment and chemical reactions, then passivated for dopamine (DA) quenching detection, showing low detection limit and wide linear range.
Article
Chemistry, Physical
Jayasmita Jana, Jin Suk Chung, Seung Hyun Hur
Summary: This study synthesized carbon dot-supported bimetallic hydroxide nanocomposites for electrocatalytic hydrogen evolution with low overpotential and high Tafel slope, attributed to their unique structure and catalytic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Spectroscopy
Linlin Wang, Jayasmita Jana, Jin Suk Chung, Seung Hyun Hur
Summary: High quantum yield GAAP-CDs were synthesized using a simple hydrothermal route and utilized as sensing probes for toxic hypochlorite. The synthesized CDs demonstrated low detection limits and excellent selectivity towards ClO- ions, making them promising candidates for ClO- detection in tap water and drinking water samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Physical
Jayasmita Jana, K. C. Bhamu, Yen-Linh Thi Ngo, Sung Gu Kang, Jin Suk Chung, Seung Hyun Hur
Summary: Bimetallic ZnO-Ni(OH)2 composite materials were prepared as efficient catalysts for the oxygen evolution reaction (OER) in electrocatalytic water splitting. Utilizing a hydrothermal process assisted by PVP and dopamine, the catalyst ZNDP-1 with a 3D interconnected structure showed low over potential and high stability in alkaline medium. DFT studies revealed the mechanistic pathway of the catalyst.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Tran Van Phuc, Jayasmita Jana, Nivetha Ravi, Sung Gu Kang, Jin Suk Chung, Won Mook Choi, Seung Hyun Hur
Summary: This study presents a rational design of Ni/Co metal-organic framework (MOF) nanosheet array catalyst on CoO modified Ni foam substrate for efficient water splitting. The optimized NC-2@CoO/NF catalyst demonstrates excellent electrochemical performance with low overpotential and cell voltage, achieving overall water splitting at a much smaller voltage than commercial catalysts. The synergistic effects of Ni/Co-MOF and CoO/NF contribute to the outstanding performance and long-term stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Spectroscopy
Linlin Wang, Jayasmita Jana, Jin Suk Chung, Won Mook Choi, Seung Hyun Hur
Summary: Low-cost nitrogen and boron-doped carbon nanodots (CPAP-CDs) with high quantum yield were synthesized through a facile hydrothermal treatment. These CPAP-CDs showed wide absorption, strong fluorescence, and pH-dependent behavior, making them suitable for detecting nitrite ions. The method had a low detection limit, wide linear detection range, and was successfully applied to different water samples testing.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Energy & Fuels
Jayasmita Jana, Ravi Nivetha, Huynh Ngoc Diem, Tran Van Phuc, Sung Gu Kang, Jin Suk Chung, Won Mook Choi, Seung Hyun Hur
Summary: In this study, a ternary composite material was synthesized as an electrode material for water reduction under alkaline conditions. The study showed that the material has selective reactive sites, requires a significant overpotential to achieve the desired current density, and exhibits good reaction rate and stability.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Environmental
Yen-Linh Thi Ngo, K. C. Bhamu, Anastasiia Voronova, Jayasmita Jana, Sung Gu Kang, Jin Suk Chung, Won Mook Choi, Jong Hyun Jang, Seung Hyun Hur, Bora Seo
Summary: In this study, a high-density carbide-oxide heterostructure was successfully synthesized by using nano-sized carbon dots as carbon sources dispersed on tungsten oxide nanorods. The resulting tungsten carbide-oxide composite exhibited superior electrocatalytic activity with low overpotential and high current density in acidic media.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Jayasmita Jana, Tran Van Phuc, Jin Suk Chung, Won Mook Choi, Seung Hyun Hur
Summary: A carbon nanosphere-protected CuO/Co3O4 composite was synthesized and used as a cathode material for electrocatalytic seawater splitting. The composite showed excellent electrocatalytic activity and stability, making it a promising candidate for seawater electrocatalysis.
Review
Energy & Fuels
Ravi Nivetha, Sushant Sharma, Jayasmita Jana, Jin Suk Chung, Won Mook Choi, Seung Hyun Hur
Summary: Metal-organic frameworks (MOFs) are porous crystalline materials formed by coordination bonding between organic ligands and metal ions or clusters, and have attracted significant interest due to their high porosity, diverse structures, and controllable chemical composition. The focus has recently shifted to 2D transition-metal (TM)-based MOFs, which exhibit high aspect ratios and can be used to construct heterostructures with high electrical conductivity and abundant active sites. This review provides a comprehensive overview of the synthesis strategies, applications, and recent advances in energy conversion and storage of 2D TM-based MOFs and their composites/derivatives.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
Jayasmita Jana, Tata Sanjay Kanna Sharma, Jin Suk Chung, Won Mook Choi, Seung Hyun Hur
Summary: In this study, iron-molybdenum composites with carbide and oxide functionalities were synthesized and their catalytic activities towards the electrolysis of water and urea were investigated. A 3D carbon nano-nest (CnN) was used as the carbide source and stabilizing agent. Different behavior was observed when the materials were used as electrode materials for water splitting and alkaline urea electrolysis. The reaction mechanism depended on the nature of the catalyst surface and constituents.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Jayasmita Jana, Tata Sanjay Kanna Sharma, Jin Suk Chung, Won Mook Choi, Seung Hyun Hur
Summary: In recent years, the search for transition-metal-based materials for overall water splitting in the energy field research has gained attention. A series of late first-row transition-metal molybdates (TMMo) were studied for alkaline water splitting, where the materials were synthesized through a hydrothermal process. Among the molybdates, CoMo exhibited the best activity and stability, making it a potential commercial alternative electrocatalyst for overall water splitting.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)