Article
Chemistry, Physical
Jadranka Milikic, Sara Knezevic, Milos Ognjanovic, Dalibor Stankovic, Lazar Rakocevic, Biljana Sljukic
Summary: Porous cobalt (III) oxide (Co3O4) and mixed cobalt (III) oxide -tin oxide (Co3O4/SnO2) with spherical morphology were prepared by a novel template-based hydrothermal method. They showed excellent performance as bifunctional electrocatalysts for oxygen reduction and evolution reactions in alkaline media, comparable to the commercial Pt/C electrocatalyst. Both materials exhibited low charge transfer resistance and low onset potential for oxygen evolution.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Physical
Suranjana Patowary, Rashmi Chetry, Chiranjita Goswami, Bhugendra Chutia, Pankaj Bharali
Summary: This article primarily documents the recent advancements and challenges of supported nanomaterials with fascinating properties towards oxygen reduction reaction (ORR). The use of carbon-based materials as support and the significant factors affecting ORR activity are discussed, along with the electrochemical techniques and parameters used for data collection and evaluation.
Review
Chemistry, Multidisciplinary
Tianlei Wang, Arunabhiram Chutia, Dan J. L. Brett, Paul R. Shearing, Guanjie He, Guoliang Chai, Ivan P. Parkin
Summary: Palladium-based alloy materials are being considered as potential substitutes for platinum-based catalysts in fuel cells for the reduction of oxygen. Through a scientometric analysis, research fronts and hotspots have been identified, with volcano plots showing general principles for catalyst modifications to enhance the oxygen reduction reaction. Various influencing factors, such as alloying, structure, and particle size, are discussed for their potential in improving the ORR activity.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Xinrui Hu, Zhengyi Xiao, Weizhen Wang, Lingzheng Bu, Zhengchao An, Shangheng Liu, Chih-Wen Pao, Changhong Zhan, Zhiwei Hu, Zhiqing Yang, Yucheng Wang, Xiaoqing Huang
Summary: This study introduces a new class of PtPbBi/PtBi core/shell nanoplates as highly active and selective catalysts for formic acid oxidation reaction (FAOR) in direct formic acid fuel cells (DFAFC). These catalysts exhibit unprecedented specific and mass activities, with a selectivity for the dehydrogenation pathway. The PtPbBi/PtBi nanoplates demonstrate high power density and stable performance in a single DFAFC device, showing great potential for commercialization. This work is of significant importance for driving the development of DFAFCs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Yanqiang Li, Zehao Yin, Xuan Liu, Ming Cui, Siru Chen, Tingli Ma
Summary: Molybdenum carbide-based catalysts show great potential in electrochemical reactions such as the hydrogen evolution reaction and oxygen evolution reaction due to their unique electronic structure and physicochemical properties. Research has systematically summarized the synthesis strategies, structure, and catalytic performance of these catalysts, highlighting the relationships between process-structure-property and analyzing catalytic mechanisms. Existing challenges and future perspectives for further development of molybdenum carbide-based catalysts have also been discussed.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Chemistry, Physical
Shan Ding, Yuxiang Zhang, Fengqian Lou, Ming Li, Qi Huang, Kang Yang, Baokai Xia, Cheng Tang, Jingjing Duan, Markus Antonietti, Sheng Chen
Summary: This study reports a novel oxygen-vacancy-type Mars-van Krevelen mechanism for promoting the electrochemical oxygen reduction reaction (ORR). The structural oxygen vacancies of zinc oxide catalysts effectively alter the electron densities of nearby metal active sites, facilitating the adsorption and activation of O-2. Experimental results demonstrate that the catalyst electrode designed based on this mechanism exhibits superior ORR activities with high Faradaic efficiency.
MATERIALS TODAY ENERGY
(2023)
Review
Chemistry, Physical
Saswati Santra, Verena Streibel, Ian D. Sharp
Summary: The transition from a global economy dependent on fossil fuels to one based on sustainable energy conversion technologies is the primary challenge of the day. Earth-abundant bifunctional transition metal catalysts, especially those based on molybdenum (Mo), show great promise in reducing cost, simplifying systems, and providing prospects for accelerated scaling and sustainable material reuse. This comprehensive review focuses on recent progress in Mo-based multifunctional catalysts, discussing various formations and structures, as well as emerging trends and opportunities in this promising materials space.
Article
Chemistry, Physical
Yongze Qin, Yu Liu, Yanzhi Zhang, Yindong Gu, Yuebin Lian, Yanhui Su, Jiapeng Hu, Xiaohui Zhao, Yang Peng, Kun Feng, Jun Zhong, Mark H. Rummeli, Zhao Deng
Summary: Heteroatomic modulation of MnO2 is an effective way to introduce and tailor the catalytically active sites for electrochemical water oxidation. This study systematically investigates the topological effect on oxygen evolution reaction (OER) activity for partially Ru-substituted MnO2 of various polymorphs, and reveals that different porosities of MnO2 respond differently to Ru integration, resulting in varied lattice strains and morphological changes. The integration of Ru not only appends active sites to MnO2, but also modifies the crystal structure to retroactively modulate the catalytic activity.
Review
Chemistry, Applied
Mengwei Guo, Rongrong Deng, Chaowu Wang, Qibo Zhang
Summary: This article reviews the application of manganese-based materials in catalytic oxygen evolution reaction (OER). Manganese oxide-based (MnOx) materials, especially MnO2, have emerged as promising non-noble electrocatalysts for water electro-oxidation under acidic conditions. The electrocatalytic activity and lifetime of MnOx-based catalysts can be improved through crystal structure control, reasonable setting of working potential and electrolyte environment, optimal selection of acid-stable conductive supports, and self-healing engineering.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Alvaro Seijas-Da Silva, Victor Oestreicher, Eugenio Coronado, Gonzalo Abellan
Summary: In this study, MgFe-based LDH phases were selected as model systems to investigate the effect of Fe-clustering on the OER performance. The results showed that samples with a lower Fe-clustering degree exhibited better electrocatalytic performance.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
A. Touni, Ch Papoulia, E. Pavlidou, D. Karfaridis, D. Lambropoulou, S. Sotiropoulos
Summary: Mixed Ir-Pt electrocatalytic films were prepared on Ti metal supports via galvanic deposition, and their bifunctional electrocatalytic performance was evaluated. The results demonstrated satisfactory performance of the prepared films towards both oxygen evolution and reduction reactions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Yuping Chen, Fang Sun, Qing Tang
Summary: Bimetallic Palladium-based catalysts with transition metal doping have been studied for their oxygen reduction reaction (ORR) activity and stability. The doping of transition metal into the ultrathin Pd nanosheets greatly modifies the reactivity of the Pd site. Several promising alternatives with lower ORR overpotential than pure Pd metallene have been identified. The hetero-metal induced ligand effect plays a key role in improving the activity.
Article
Chemistry, Applied
Yanan Zhang, Yanpeng Liu, Zhenhua Liu, Xiaogang Wu, Yuxiang Wen, Hangda Chen, Xia Ni, Guohan Liu, Juanjuan Huang, Shanglong Peng
Summary: The nitrogen-doped MnO2@N cathode prepared through defect engineering greatly improves the cycle stability of manganese-based aqueous zinc-ion batteries by enhancing conductivity and electrochemical stability, leading to a high capacity retention rate. In addition, nitrogen doping promotes the diffusion of H+ and Zn(2+), resulting in enhanced battery performance.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Ungsoo Kim, Sangjin Lee, Nam Khen Oh, Jihyung Seo, Ji Hoo Cha, Junghyun Lee, Seong-hun Lee, Tae Joo Shin, Jeong Min Baik, Young-Kyu Han, Hyesung Park
Summary: The optimal oxidation state and electronic structure of active sites in an electrocatalyst are critical factors for maximizing water-oxidation kinetics. In this study, a heterostructured electrocatalyst with optimized oxidation states for active metal sites was developed, showing excellent oxygen evolution reaction (OER) performance and operational durability. The accumulation of lithium atoms at the interface played a mediating role in optimizing the oxidation state and electronic structure of OER active metal elements, leading to a lower energy barrier for the rate-determining step in OER.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Review
Chemistry, Physical
Qizheng An, Jingjing Jiang, Weiren Cheng, Hui Su, Yong Jiang, Qinghua Liu
Summary: This review classifies dual-atom catalysts (DACs) based on their configurations and metal sites and discusses their synthetic strategies, characterization techniques, and applications in various electrocatalytic reactions. DACs, with higher metal loading and more flexible active sites compared to single-atom catalysts, exhibit improved catalytic performance.
Article
Electrochemistry
Anupriya Arul, Maria Christy, Mi Young Oh, Yun Sung Lee, Kee Suk Nahm
ELECTROCHIMICA ACTA
(2016)
Article
Electrochemistry
Hosaeng Jang, Awan Zahoor, Yongbin Kim, Maria Christy, Mi Young Oh, Vanchiappan Aravindan, Yun Sung Lee, Kee Suk Nahm
ELECTROCHIMICA ACTA
(2016)
Article
Chemistry, Physical
Maria Christy, Anupriya Arul, Awan Zahoor, Kwang Uk Moon, Mi Young Oh, A. Manuel Stephan, Kee Suk Nahm
JOURNAL OF POWER SOURCES
(2017)
Article
Chemistry, Physical
Anupriya Arul, Hyoseok Pak, Kwang Uk Moon, Maria Christy, Mi Young Oh, Kee Suk Nahm
APPLIED CATALYSIS B-ENVIRONMENTAL
(2018)
Article
Electrochemistry
Maria Christy, Anupriya Arul, Youngbeom Kim
ELECTROCHIMICA ACTA
(2019)
Article
Chemistry, Physical
Angulakshmi Natarajan, Kathiresan Murugavel, Kanagaraj Madasamy, Shruti Suriyakumar, N. Illayaraja, N. Anupriya, Maria Christy, K. S. Nahm, Yingke Zhou, A. Manuel Stephan
Article
Green & Sustainable Science & Technology
Hwichul Yang, Hojae Lee, Yonghyun Lim, Maria Christy, Young-Beom Kim
Summary: Reverse electrowetting-on-dielectric (REWOD) is a novel energy harvesting technique that uses high capacitance dielectric layers and a new leakage barrier layer to minimize current leakage and maximize power output. The laminated structure with TiO2 and Al2O3 shows reduced current leakage and relatively high capacitance compared to single layer structures, producing enhanced power density at low bias voltage. The energy-harvesting performance displays different behaviors about current generation based on the top surface material in contact with conductive droplets.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2021)
Article
Energy & Fuels
Maria Christy, Hashikaa Rajan, Hwichul Yang, Young-Beom Kim
Article
Chemistry, Physical
Jung Su Lee, Hashikaa Rajan, Maria Christy, Sung Chul Yi
Summary: The Co-decorated nitrogen and sulfur co-doped carbon nanostructures (Co-NSC) exhibit high catalytic activity for oxygen reduction reactions, aiming to replace expensive commercial Pt catalysts. The sulfur co-doping dramatically enhances intrinsic catalytic activity, with variation in sulfurization degree influencing overall catalytic performance. Co-NSC 200 with high sulfur doping shows improved onset potential and current density, making it a promising PGM-free catalyst option.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Maria Christy, Hashikaa Rajan, Hwawoo Lee, Iqra Rabani, Sang Man Koo, Sung Chul Yi
Summary: The ABO(3-δ)-type perovskite oxides, particularly La0.6Sr0.4CoO3-δ (LSC), have been studied as highly desirable electrocatalysts. Defect engineering and surface modification have been used to transform the performance of LSC electrodes, leading to the development of a surface-modified LSC/LDH (75/25) cathode with excellent bifunctionality. The composite shows superior oxygen reduction and evolution reaction performances, as well as stable cycle performance in alkaline media.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Rohan B. Ambade, Ganesh Kumar Veerasubramani, Swapnil B. Ambade, Maria Christy, Wonsik Eom, Hwansoo Shin, Young-Beom Kim, Dong-Won Kim, Tae Hee Han
Summary: This study demonstrated the fabrication of a rechargeable sodium-ion battery anode material using fast intense pulsed light processing at room temperature, showing excellent performance and providing new possibilities for energy storage applications.
Review
Chemistry, Physical
Ghadia Ahmed, Zahoor ul Hussain Awan, Faaz Ahmed Butt, Faizan Raza, Saud Hashmi, G. Gnana Kumar, Maria Christy
Summary: Li-air batteries are environmentally friendly and compact energy storage solutions with superior performance and high energy density. However, they face challenges such as high overpotential and parasitic reactions. Research has shown that optimizing redox mediators and electrolyte can reduce these issues and improve the efficiency and stability of Li-air batteries.
JOURNAL OF POWER SOURCES
(2022)
Review
Chemistry, Physical
Samra Asad, Awan Zahoor, Faaz Ahmed Butt, Saud Hashmi, Faizan Raza, Inam Ul Ahad, Jabir Hakami, Sami Ullah, Amir Al-Ahmed, Firoz Khan, Maria Christy
Summary: As fossil fuels are becoming depleted, the world is shifting towards renewable energy sources and energy storage technologies. Metal-air batteries, specifically lithium-air batteries, are gaining attention due to their high energy density. MXenes, with their high electrical conductivity and catalytic activity, have emerged as promising materials for energy storage applications.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Sk Khalid Rahaman, Taposi Chatterjee, Basudeb Dutta, Goutam Pramanik, Saikh Mohammad Wabaidur, Essam A. Al-Ammar, Maria Christy, Mohammad Hedayetullah Mir, Seikh Mafiz Alam
Summary: A Zn(II) based coordination polymer (CP) [Zn2(cis,cis-muco)2(bpe)2(H2O)2] (1) with a one-dimensional zig-zag chain and distorted tetrahedral Zn(II) center has been synthesized. The 1D chain forms a two-dimensional supramolecular architecture through hydrogen bonding interactions. The compound exhibits semiconducting nature, which is confirmed by both theoretical calculations and experimental optical study. Therefore, it can be used for the fabrication of semiconducting devices.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
Hashikaa Rajan, Maria Christy, Vasanth Rajendiran Jothi, S. Anantharaj, Sung Chul Yi
Summary: Cellulose fiber with unique morphology was used to fabricate catalytically active cobalt substrates for efficient water splitting. Cobalt-based bimetallic alloys were electrodeposited to achieve exceptional water electrolyzing catalytic activities under harsh industrial standards.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)