Article
Chemistry, Physical
Hye Hyeon Han, Sang-Mun Jung, Su-Kyung Kim, Geon-Hui Lee, Seong-Jong Kim, Yong-Tae Kim, Sei Kwang Hahn
Summary: In this study, a bimetallic electrocatalyst of hyaluronate-Au@Pt was synthesized to enhance the oxygen reduction reaction performance of biofuel cells. Hyaluronate, as a biocompatible polysaccharide, was used to improve the dispersibility and stability of the electrocatalyst. The optimized electrocatalyst showed high open circuit voltage and maximum current density, demonstrating its potential in energy generation.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Heon Chul Kim, Jong Wook Hong
Summary: Highly porous Au-Pt urchin-like bimetallic nanocrystals were prepared by a one-pot wet-chemical synthesis method, with the porosity controlled by the amount of hydrazine used as reductant. Due to their unique morphology leading to high porosity and surface active sites, the prepared nanocrystals were superior catalysts for electrochemical methanol oxidation. This approach opens up possibilities for designing bimetallic porous materials with unprecedented functions.
Article
Materials Science, Multidisciplinary
Shuang Wei, Fei Xie, Mengyu Gan, Li Ma, Taichun Wu, Qinglan Fu, Tingting Li, Yanlin Yang, Wang Zhan
Summary: A novel Pt/Co2C-Mo2C@CS catalyst has been developed by growing molybdenum carbide and cobalt carbide on the surface of carbon spheres and depositing platinum nanoparticles, demonstrating significantly improved methanol oxidation activity and stability, mainly attributed to the metal-support interaction.
Article
Nanoscience & Nanotechnology
Zipeng Zhao, Zeyan Liu, Ao Zhang, Xingxu Yan, Wang Xue, Bosi Peng, Huolin L. Xin, Xiaoqing Pan, Xiangfeng Duan, Yu Huang
Summary: The authors report the design and development of ultrathin PtCo nanocatalysts encased in graphene nanopockets, which exhibit excellent electrochemical accessibility and durability under low loading conditions. These catalysts show promising fuel cell performance, making them ideal for reducing fuel cell costs.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Physical
Minghua Wang, Changbao Wang, Lei Zhu, Feilong Rong, Linghao He, Yafei Lou, Zhihong Zhang
Summary: The bimetallic NiCo-MOF exhibited improved electrocatalytic activity towards methanol oxidation reaction (MOR), with high current density and remarkable cycling stability in alkaline medium. The catalyst consisted of mixed-valence Co(II)/Co(III) and Ni(II)/Ni(III) and showed a large specific surface area and evenly distributed nanocubes. The catalytic mechanism of NiCo-MOF towards MOR was provided.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Energy & Fuels
Vi Thuy Thi Phan, Toan Minh Pham, Hau Quoc Pham, Tai Thien Huynh, Thi Hong Tham Nguyen, Van Thi Thanh Ho
Summary: This study focuses on the synthesis and application of a high-performance Pt3Co1/Ti0.9Ir0.1O2 catalyst for direct methanol fuel cells. By depositing Pt3Co1 alloy nanoparticles on a robust Ti0.9Ir0.1O2 support, the catalyst exhibits improved activity and poisoning tolerance, as well as lower cost and better stability compared to commercial Pt/C catalyst. The success of this work provides a foundation for further development of TiO2-based bimetallic catalysts in the electrochemical catalysis field.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Humayra Begum, Mohammed M. Rahman, Mohammad A. Hasnat
Summary: A PtAuCo trimetallic electrode was prepared using a simple electrochemical deposition technique for investigating methanol electro-oxidation. The electrode exhibited higher stability and resistance to CO adsorption compared to conventional Pt and PtAu electrodes.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Ashkan Koushanpour, Edward J. Harvey, Geraldine Merle
Summary: This study examines the atomic confinement of commercial Pt/C electrocatalysts and successfully protects the carbon surface using a combination of diazonium chemistry with Cu electrodeposition, resulting in improved stability and ionic transfer. The resulting electrocatalysts exhibit exceptional ORR stability after accelerated stress testing.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Hehuan Cao, Jidong Cao, Fanghui Wang, Shuxian Di, Hong Zhu, Min Pu, Andzhela Bulanova
Summary: PtCu porous nanowires with controllable composition are synthesized for improving the activity of oxygen reduction reaction. The mass activity of Pt0.5Cu0.5 PNWs reaches approximately 5 times higher than that of commercial Pt/C catalyst. The improved activity and better durability of the porous nanowire catalyst are confirmed in both electrochemical tests and accelerated durability test.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Francesca Lorandi, Keti Vezzu, Angeloclaudio Nale, Gioele Pagot, Yannick H. Bang, Enrico Negro, Vito Di Noto
Summary: This report presents the interplay between synthesis parameters, physicochemical properties, and electrochemical performance of core-shell low-Pt electrocatalysts for the oxygen reduction reaction. The study focuses on the impact of pyrolysis temperature, support core composition, and an electrochemical dealloying-activation step on the morphology and stability of active sites. The results show that the presence of graphene and carbon in the support improves the dispersion of active sites, leading to vastly improved mass activity and durability.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Xinfu He, Xueying Long, Peng Wang, Hongju Wu, Pengfei Han, Yong Tang, Keke Li, Xiaorui Ma, Yating Zhang
Summary: The Fe3O4/rGO composite demonstrates superior catalytic performance for oxygen reduction reaction compared to commercial Pt/C catalyst, with high limiting current density, low H2O2 yield, high electron transfer number, and excellent long-term durability and methanol resistance in alkaline electrolytes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Respati K. Pramadewandaru, Young Wook Lee, Jong Wook Hong
Summary: Metal nanocrystals with controlled compositional and distributional structures are of great importance in fuel cell systems. This study investigates the relationship between atomic distribution and electrocatalytic activity by developing four types of nanocubes with similar sizes and controlled compositions. The Pd-Pt alloy nanocubes exhibit exceptional performance in methanol oxidation reaction, surpassing the catalytic activity of other nanocubes.
Article
Chemistry, Physical
Hong-Ling Meng, Shi-Yi Lin, Ying Cao, Ai-Jun Wang, Lu Zhang, Jiu-Ju Feng
Summary: In this study, CoFe@NCNTs were synthesized through a one-step co-pyrolysis method, displaying excellent ORR activity and outperforming commercial Pt/C. Compared to MOFs-based strategy, this simple and convenient method avoids the complex synthesis of MOFs.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Chenguang Li, Yuting Li, Zhihui Yao, Juan Wang, Qin Zhong
Summary: BMZIFs modified with a small amount of glucose exhibit excellent ORR performance, with enhanced graphitization degree and conductivity. The addition of glucose improves the electrocatalytic performance of the catalyst.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Zaoxue Yan, Jiajia Cui, Zongyao Zhang, Zhifeng Jiang, Wei Wei, Guisheng Zhu, Xinhong Zhao
Summary: We demonstrate that the electrochemically corroded thick nitrogen-doped carbon (N-C) layer encapsulated Pt/C catalyst exhibits high activity and ultrahigh stability for methanol oxidation and oxygen reduction reactions. The encapsulation of thick N-C layers initially results in low activity, but after an aging corrosion process, the activities increase significantly and remain stable. The catalyst also shows high power densities and maintains stability in an acidic membrane fuel cell. The corrosion of the thick N-C layer leads to the formation of micropores, which enhance mass transport and protect Pt particles, thereby improving activity and stability.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Analytical
P. Arul, Sheng-Tung Huang, N. S. K. Gowthaman, G. Mani, Nithiya Jeromiyas, Sekar Shankar, S. Abraham John
Summary: In this study, controlled growth of Ni-MOF on amino acid-functionalized graphene nanoplatelets was achieved by a solvothermal approach. The resulting nanocomposite showed a stable response and wide linear range for the oxidation of bisphenol A. The presence of hydroxyl and epoxy functional groups restricted the uncontrolled growth of Ni-MOF, leading to improved electrochemical properties.
ANALYTICA CHIMICA ACTA
(2021)
Article
Chemistry, Analytical
Sim Siew Ming, N. S. K. Gowthaman, H. N. Lim, P. Arul, E. Narayanamoorthi, I. Ibrahim, H. Jaafar, S. Abraham John
Summary: In this study, an electrochemical sensor based on Al-MOF (CAU-1-MOF) fabricated glassy carbon electrode (GCE) was utilized for the detection of hydroquinone (HQ), an environmental pollutant. The synthesized CAU-1-MOF showed promising results in HQ detection, demonstrating good sensitivity and anti-interference properties. The proposed sensor also exhibited excellent recovery rates in the determination of HQ in water samples, indicating its practicality and reliability in real-life applications.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Jincymol Kappen, Manikka Kubendran Aravind, Perumal Varalakshmi, Balasubramaniem Ashokkumar, S. Abraham John
Summary: A sustainable strategy using graphene quantum dots coated carbon cloth is introduced for the remediation of Hg(II) as Hg(0) and its use as a sensor for nitrobenzene. The method shows efficient removal of Hg(II) and sensitive sensing performance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Electrochemistry
E. Narayanamoorthi, P. Arul, N. S. K. Gowthaman, S. Abraham John
Summary: Morphology controlled synthesis of Cu-MOFs was achieved by using ligands with different aliphatic chain lengths and metal ions with different counterions. The AZA-Cu-MOF showed better electrocatalytic activity for glucose oxidation and can be used for glucose quantification in real samples.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Jincymol Kappen, Sinduja Bharathi, S. Abraham John
Summary: We conducted a comprehensive study on the interaction between transition and heavy metal ions and graphene quantum dots-capped silver nanoparticles (AgGQDs), using various spectroscopic and microscopic techniques. The results showed that metal ions can interact with AgGQDs through selective coordination, adsorption, and direct interaction with silver nanoparticles. The special interaction between heavy metal ions and the graphene surface determines the mechanistic pathway of the reaction.
Article
Chemistry, Multidisciplinary
Ameer Farithkhan, S. Abraham John
Summary: This study successfully grew three-dimensional coral-like NiFe-based layered double hydroxide (NF-LDH) microstructures on nitrogen-doped carbonized wood (NCW) and demonstrated their voltammetric response for urea. The direct anchoring of catalytically active structures on conductive scaffolds eliminated electron transfer resistance and exhibited excellent sensing performance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Electrochemistry
N. M. Abdul Khader Jailani, M. Chinnasamy, N. S. K. Gowthaman
Summary: CuO nanospheres were synthesized by a one-step wet chemical approach and used for the quantification of HZ on a GCE. The CuO NS modified GCE showed excellent sensitivity and selectivity, making it a reliable and low-cost electrochemical platform for HZ determination.
JOURNAL OF ELECTROCHEMICAL SCIENCE AND ENGINEERING
(2022)
Article
Electrochemistry
Ajay Ajith, S. Abraham John
Summary: Electrochemical sensing of uric acid using nitrogen-rich carbon nanomaterials showed promising results, with electrodeposited graphitic carbon nitride exhibiting the highest oxidation current for UA. The practical application in human blood serum samples yielded accurate results.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Analytical
A. D. Daud, H. N. Lim, I. Ibrahim, N. A. Endot, N. S. K. Gowthaman, Z. T. Jiang, Kyle E. Cordova
Summary: In this study, a non-enzymatic glucose sensor based on a metal-organic framework (MOF) was developed. The sensor exhibited a multi-layered sheet-like structure and -NH2 functional groups, which resulted in higher sensitivity, stability, and anti-interference ability for long-term glucose monitoring.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
N. S. K. Gowthaman, Debananda Mohapatra, P. Arul, Wei Sea Chang
Summary: This paper presents the decoration of AuNPs on carbon nano-onions (CNO) and its application for the sensitive detection of hydrazine (HZ) in effluent samples. The AuNPs are successfully decorated on CNOs using a green ultrasonication approach followed by electroless deposition. The obtained Au@CNO nanostructure exhibits high electroactive surface area and lower resistivity, and it shows higher electrocatalytic activity for the determination of HZ compared to bare and CNO fabricated electrodes. The green and environmentally benign method of Au@CNO nanostructure offers a low detection limit and larger sensitivity for the determination of HZ in effluent samples.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ajay Ajith, N. S. Krishnan Gowthaman, S. Abraham John, Kuppanagounder P. P. Elango
Summary: Different modes of attachment of graphene oxide (GO) on an electrode surface were investigated. It was found that multilayers of GO were adsorbed on the electrode surface, with the adsorption being limited by folding up of the GO sheets at their edges. pH studies showed that higher adsorption was achieved at pH = 3. Electrochemical reduction of GO(ads) resulted in increased electroactive surface area and improved performance in uric acid determination.
Article
Chemistry, Physical
N. S. K. Gowthaman, Jhih-Wei Chen, Chang Fu Dee, Siang-Piao Chai, Wei Sea Chang
Summary: This report presents a strategy to inhibit electron-hole recombination and enhance charge separation and injection efficiency in ZnO nanorods for photoelectrochemical performance. The presence of surface oxygen vacancies and metal/semiconductor heterojunction contribute to the improved photoactivity. The findings highlight the importance of surface modification and heterojunction design in developing efficient photoanodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Ajay Ajith, S. Abraham John
Summary: This study prepared graphitic carbon nitride nanosheets (GNNS) through different methods and compared their electrochemical performance, showing that GNNS prepared by water exfoliation method have lower impedance and higher electroactive surface area, exhibiting higher catalytic activity towards the reduction of nitrobenzene.
NEW JOURNAL OF CHEMISTRY
(2022)
