Article
Chemistry, Physical
Debanjali Ghosh, Mopidevi Manikanta Kumar, C. Retna Raj, Debabrata Pradhan
Summary: In this study, CeO2 nanospheres embedded in NiO nanoflakes were synthesized and demonstrated to have bifunctional activity for the oxygen evolution reaction and oxygen reduction reaction (OER/ORR). The CeO2/NiO-2 nanocomposite showed outstanding OER/ORR activity and stability compared to other compositions and benchmark catalysts. The unique morphology of CeO2 nanospheres embedded in NiO nanoflakes facilitated the exposure of active sites with the bifunctional nature of the catalyst. The electronic synergy between CeO2 and NiO contributed to the formation of oxygen vacancy defects and accessible active sites.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Applied
Haihong Zhong, Luis Alberto Estudillo-Wong, Yuan Gao, Yongjun Feng, Nicolas Alonso-Vante
Summary: The study fabricated a CeO2 decorated CoOx/RGO composite via a surfactant-assisted route and found that the introduction of CeO2 and oxygen vacancies effectively enhanced the electrocatalytic activity, leading to efficient and stable bifunctional electrocatalysis in alkaline electrolyte.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Xin Ding, Run Jiang, Jialin Wu, Minghui Xing, Zelong Qiao, Xiaofei Zeng, Shitao Wang, Dapeng Cao
Summary: This study successfully synthesized the heterostructure of nickel nitride and ceria on nickel foam, showing excellent hydrogen evolution and oxygen evolution performance. Ceria plays different roles in the hydrogen evolution and oxygen evolution processes. The study reveals the different catalytic mechanisms of ceria in boosting the hydrogen evolution and oxygen evolution activities of nickel nitride, providing useful guidance for designing high-performance bifunctional catalysts.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Zhijun Zhang, Kezhen Chen, Jichang Lu, Qin Zou, Yuhui Zhao, Yongming Luo, Dedong He, Rongtao Li
Summary: Investigation of Sn modified CuO-CeO2 catalysts showed that Sn-Cu-Ce-5 catalyst exhibited stronger interaction between active sites and support, higher amounts of Sn2+ and Ce3+, and increased amount of oxygen vacancies, leading to excellent catalytic performance even in the presence of CO2 and H2O.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Debanjali Ghosh, Indrajit Chakraborty, Makarand M. Ghangrekar, Debabrata Pradhan
Summary: Microbial fuel cell (MFC) is a renewable energy conversion device that uses microbes to generate electricity from wastewater. The oxygen reduction reaction (ORR) at the cathode of MFC requires an active and stable electrocatalyst. In this study, CeO2-gC3N4 composite catalysts with varying ratios were synthesized for ORR. The 15% CeO2-gC3N4 catalyst showed excellent ORR activity due to its high surface area, oxygen vacancy defects, and low charge transfer resistance. The catalyst was also tested in MFC and showed similar ORR activity, with the MFC-15 exhibiting the best power performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Applied
Hongyao Xue, Alan Meng, Tongqing Yang, Zhenjiang Li, Chunjun Chen
Summary: Introducing vacancy defects and unique morphology is an effective strategy to improve the catalytic performance of transition metal compounds. This study proposes a facile and efficient synthesis method to precisely control the amount of oxygen vacancies in Mn-doped CoO nanomaterials, resulting in ultra-high catalytic activity for hydrogen evolution reaction and oxygen evolution reaction, and potentially valuable applications in electrochemical water splitting and biomedical fields.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Engineering, Chemical
Sifan Wang, Hao Chen, Wenwen Lin, Wenhua Zhou, Xiangzhou Lv, Jianghao Wang, Jie Fu
Summary: A CuO-CeO2 hybrid catalyst developed through interface engineering significantly improves the selectivity of ethylene, offering new possibilities for CO2 reduction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Yan Zhang, Wanyi Liao, Guangqiang Zhang
Summary: This study successfully synthesized two-dimensional transition metal oxides/CeO2 heterostructures with rich oxygen vacancies, demonstrating excellent bifunctional electrocatalytic performance for both hydrogen evolution reaction and oxygen evolution reaction in alkaline environments with low overpotentials.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Kinjal B. Patel, Bhavesh Parmar, Krishnan Ravi, Rajesh Patidar, Gopala Ram Bhadu, Jayesh C. Chaudhari, Divesh N. Srivastava
Summary: This research develops an efficient bifunctional electrocatalyst for both hydrogen and oxygen reactions. Through simple pyrolysis of a nickel-based metal organic framework at temperatures of 600, 700, and 800 ℃, three bifunctional electrocatalysts, Ni@NCS-600, Ni@NCS-700, and Ni@NCS-800, were prepared. Among them, Ni@NCS-800 exhibits extremely low overpotential and shows high catalytic activity comparable to precious state-of-the-art catalysts (RuO2 and Pt/C).
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Jie Zhu, Qian Zhang, Peng Zhao, Lin Chen, Sudong Yang, Qiang Yan, Hongmei Li
Summary: This study focuses on the development of robust and high-performance bifunctional electrocatalysts for overall water splitting. Pine-needle-like NiFe2O4@Co3O4 heterostructure nanoarrays with abundant oxygen vacancies were deposited onto nickel foam, showing outstanding catalytic activity and high electrochemical stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xuebin Hou, Kaifeng Xie, Zelong Huang, Chen Shi, Qufu Wei, Yi Hu
Summary: MoS2@Co9S8/C composite nanofibers with a blossom branch distributed structure were prepared via a facile method, and the close mutual combination between MoS2 and Co9S8 enhances the synergistic effect of the heterointerface, improving the catalytic reaction. The composite nanofibers exhibit high activity toward hydrogen and oxygen evolution reactions, providing a facile strategy for designing a heterostructure with close mutual heterogeneous combination and without aggregation.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Abdul Hanan, Muhammad Nazim Lakhan, Dong Shu, Altaf Hussain, Mukhtiar Ahmed, Vinod Kumar, Dianxue Cao, Irfan Ali Soomro
Summary: This study focuses on a new type of electrocatalyst, which combines cobalt ferrite oxide (Co2FeO4) and palladium oxide (PdO) nanostructures prepared through hydrothermal and ultraviolet (UV) irradiation techniques. This catalyst exhibits excellent electrocatalytic performance for water splitting in alkaline medium, with high concentration of active sites, improved electrical conductivity, and stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Xiangjun Zheng, Xuecheng Cao, Yu Zhang, Kai Zeng, Long Chen, Ruizhi Yang
Summary: A cobalt-doped Mn-2(OH)(3)VO3 catalyst was prepared by a facile hydrothermal method, with tuned ratios of cationic redox couples to achieve enhanced electrocatalytic performance. When employed as an air-cathode catalyst for rechargeable Zn-air batteries, the catalyst showed high power density, enhanced rate performance, and outstanding long-term stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Electrochemistry
S. Brindha Devi, R. Navamathavan
Summary: In order to meet the demand for green and clean technology, a novel electrocatalyst has been developed for overall water-splitting. The hybrid non-noble metal catalyst nanocomposite of Ti3C2-CoS2 (TC-CS) was created as a bifunctional electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The nanocomposite exhibits a low overpotential for both HER and OER, making it a promising candidate for future energy technology revolution.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Dentistry, Oral Surgery & Medicine
Liliane Ramos Costa, Mario Vianna Vettore, Larissa Neves Quadros, Janete Maria Rebelo Vieira, Ana Paula Correa de Queiroz Herkrath, Adriana Correa de Querioz, Juliana Vianna Pereira, Fernando Jose Herkrath, Maria Augusta Bessa Rebelo
Summary: This study examines the relationships between socio-economic status, psychosocial factors, health-related behaviors and the incidence of dental caries among 12-year-old schoolchildren living in deprived communities in Manaus, Brazil. The findings suggest that sugar consumption and sedentary behavior directly predict the incidence of dental caries. Higher socio-economic status is associated with lower sugar consumption and higher sedentary behavior. Higher social support directly predicts lower sugar consumption. Lower socio-economic status and lower social support indirectly predict dental caries incidence through sugar consumption and sedentary behavior.
JOURNAL OF DENTISTRY
(2023)
Article
Chemistry, Analytical
Himadri Raha, Debabrata Pradhan, Prasanta Kumar Guha
Summary: To achieve higher stability and fast charging in energy storage devices, increasing coulombic efficiency is essential. We demonstrate a new approach to achieve ultra high coulombic efficiency in supercapacitors by introducing parasitic electrochemical processes in biomass derived carbon (BDC) based electrodes. Carbon samples synthesized with varying activating agents (KOH and NaOH) and carbonization temperatures (600 and 800 degrees C) captured alkali metals from the activating agents. These trapped alkali metals participate in parasitic electrochemical processes, resulting in ultrahigh coulombic efficiency (>115%) for the first few thousand charge discharge cycles. An asymmetric supercapacitor (ASC) was fabricated using the prepared BDC as the negative electrode, which showed high coulombic efficiency and retained about 98% of its initial capacitance even after 10,000 cycles.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Chemical
Jasasmita Das, Shweta Rawat, Abhijit Maiti, Lovjeet Singh, Debabrata Pradhan, Paritosh Mohanty
Summary: The cyclophosphazene and triazine moieties based inorganic-organic hybrid nanoporous materials (CTHMs) were synthesized and have the potential to remove Hg2+ ions from water effectively. CTHM-2 showed a maximum adsorption capacity of 774 mg g(-1). A mixed matrix membrane (MMM) prepared using CTHM-2 achieved the acceptable Hg2+ limit for drinking water.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Tuhin Ghosh, Pratap Mane, Prasana Kumar Sahoo, Brahmananda Chakraborty, Debabrata Pradhan
Summary: Hybrid organometallic halide perovskite-based semitransparent solar cell research is gaining attention for its potential applications in various fields. The key challenges lie in improving stability and controlling crystalline qualities in perovskite thin films. This study presents in situ strain modulation and demonstrates the single-step deposition method of formamidiniumchloride (FACl)-mediated CH3NH3PbI3 (MAPbI3) thin films for semitransparent solar cells. The addition of FACl plays a critical role in controlling crystallinity, growth orientations, and in situ strains, improving the efficiency of the solar cell device.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Inorganic & Nuclear
Kousik Bhunia, Moumita Chandra, Sanjeev Kumar Sharma, Debabrata Pradhan, Sang -Jae Kim
Summary: The current global demand for green H2 from water necessitates the use of an efficient and robust catalyst to reduce greenhouse gas emissions. Transition metal phosphide (TMP) based catalysts have emerged as viable alternatives to state-of-the-art Pt/C catalysts for the hydrogen evolution reaction (HER). However, further investigation is needed to assess the recent development and progress of TMP-based catalysts for HER, in order to encourage the development of efficient, robust, and durable catalysts. This review provides an overview of the recent research progress on TMPs for electrochemical HER, including nanostructure synthesis, integration with support materials, and hybrid structure synthesis. The review also discusses the fundamental aspects of HER kinetics, the effect of composition and pH on different types of TMPs, and the need for pre and post-analysis to evaluate the true identity of active sites and the durability of TMPs.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Satyanarayana K. Konavarapu, Abhijit Garai, Debanjali Ghosh, Anindita Goswami, Debabrata Pradhan, Kumar Biradha
Summary: With the rapid development of electronic technology, the demand for efficient electrode materials has greatly increased. In this study, stable Co(II)- and Ni(II)-containing redox-active metal-organic frameworks (Co-MOF and Ni-MOF) were designed as efficient heterogeneous catalysts for oxygen evolution reaction (OER) and CO2 sorption studies. The structural analysis showed that Co-MOF has a double-walled square grid-type structure, while Ni-MOF has a rectangular grid-type layered structure. Both MOFs displayed efficient OER activity and the presence of hydrophilic channels promoted CO2 adsorption. The findings suggest the potential of MOFs as cost-saving and environmentally friendly electrode materials.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Energy & Fuels
Arun Kumar, Bhisma Narayan Mahanty, Anuj Rawat, Raeesh Muhammad, Rajib Kumar Panigrahi, Debabrata Pradhan, Paritosh Mohanty
Summary: Transition-metal-substituted manganese ferrites, Mn0.95M0.05Fe2O4 (M: Co, Cu, and Zn), synthesized by combustion method, exhibit a single-phase cubic spinel structure with high specific surface area and controlled pore size distribution and volume. These ferrites are useful as active electrode materials for electrochemical supercapacitors, with Mn0.95Zn0.05Fe2O4 showing the best capacitance in nonaqueous electrolytes. The effect of redox additive electrolytes on capacitance was also studied. A symmetric pouch cell supercapacitor device fabricated using Mn0.95Zn0.05Fe2O4 and a redox-active electrolyte provides high energy and power densities, demonstrating stability and high Coulombic efficiencies.
Article
Chemistry, Physical
Debanjali Ghosh, Indrajit Chakraborty, Makarand M. Ghangrekar, Debabrata Pradhan
Summary: Microbial fuel cell (MFC) is a renewable energy conversion device that uses microbes to generate electricity from wastewater. The oxygen reduction reaction (ORR) at the cathode of MFC requires an active and stable electrocatalyst. In this study, CeO2-gC3N4 composite catalysts with varying ratios were synthesized for ORR. The 15% CeO2-gC3N4 catalyst showed excellent ORR activity due to its high surface area, oxygen vacancy defects, and low charge transfer resistance. The catalyst was also tested in MFC and showed similar ORR activity, with the MFC-15 exhibiting the best power performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Surendra Jangu, Sudhir Kumar, Kilingaru Nadumane Deepika, Chacko Jacob, Debabrata Pradhan
Summary: The synthesis of Cu-doped MnO2 nanomaterials with enhanced specific surface area was demonstrated using the microwave-assisted hydrothermal method. The Cu-doping resulted in a change in morphology from nanorods to nanoflowers, leading to improved supercapacitor performance. A two-electrode asymmetric supercapacitor device showed a maximum energy density of 77.78 Wh kg(-1) and a capacitance retention of 102.86% after 20,000 charge-discharge cycles.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Tuhin Ghosh, Mayank Gupta, Birabar Ranjit Kumar Nanda, Karthik Shankar, Debabrata Pradhan
Summary: This study demonstrates a glass rod-based facile fabrication technique for producing a compact and stable thin film utilizing a mixed-halide-based perovskite precursor solution. The introduction of iodine is found to enhance the photoconversion efficiency and stability of the perovskite material.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Electrochemistry
Sabuj Kanti Das, Avik Chowdhury, Koushik Bhunia, Anirban Ghosh, Debabrata Chakraborty, Manisha Das, Utpal Kayal, Arindam Modak, Debabrata Pradhan, Asim Bhaumik
Summary: Robust and sustainable bifunctional electrocatalysts, Ni-Por-Py and Cu-Por-Py, consisting of transition metal coordinated porphyrin building blocks in pi-conjugated polymer skeletons, have been developed for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under alkaline conditions. The excellent electrocatalytic activity of these catalysts is attributed to their high specific surface areas and microporosity, which facilitate electron transfer processes.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Nagmani, Biraj Kanta Satpathy, Abhijeet Kumar Singh, Debabrata Pradhan, Sreeraj Puravankara
Summary: In this study, a jute-based precursor-derived carbon was chemically activated and tested in aqueous and non-aqueous sodium-ion capacitors. The activated carbon showed high surface area and specific capacitance, and exhibited excellent rate capability in a three-electrode aqueous system. The study also explored the use of different carbon materials as anodes and cathodes to improve the performance of sodium-ion capacitors.
NEW JOURNAL OF CHEMISTRY
(2023)
