Article
Chemistry, Multidisciplinary
Xiao bin Gao, Yucheng Wang, Weicheng Xu, Huan Huang, Kuangmin Zhao, Hong Ye, Zhi-You Zhou, Nanfeng Zheng, Shi-Gang Sun
Summary: Metallic particles can inhibit the demetalation of Fe SACSs by acting as electron donors and strengthening the Fe-N bond, thereby preventing electrochemical Fe dissolution. Different types, forms, and contents of metal particles have varying effects on the Fe-N bond strength. Screening a particle-assisted Fe SACS resulted in a 78% reduction in Fe dissolution and enabled continuous operation for up to 430 hours in a fuel cell.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Review
Chemistry, Applied
Qi-Ni Zhan, Ting -Yu Shuai, Hui -Min Xu, Chen-Jin Huang, Zhi-Jie Zhang, Gao-Ren Li
Summary: This review introduces various methods for preparing single-atom catalysts and discusses their electrocatalytic applications. The future challenges and prospects of monatomic catalysts are also discussed.
CHINESE JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Huibin Li, Yinzhi Pan, Lei Wu, Rui He, Zirong Qin, Shasha Luo, Lijun Yang, Jianhuang Zeng
Summary: RuO2@IrO2 catalyst was synthesized and applied in electrochemical water splitting for hydrogen production. The catalyst showed high activity and stability, with optimized RuO2@IrO2-20 performing the best in terms of mass activity and overpotential.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Physical
Min Young Kim, Hee-Jung Ban, Young-Woong Song, Jinsub Lim, Sang -Jun Park, Woo Joong Kim, Youngsun Hong, Byeong-Su Kang, Ho-Sung Kim
Summary: A composite catalyst of nano-grade IrO2/TiO2 powder has been synthesized for SPE cells, which reduces overvoltage and decreases costs. The catalyst has a porous composite nanostructure and exhibits better oxygen evolution reaction performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Chemistry, Physical
Franziska Hess
Summary: This article reviews the recent progress in understanding the elementary processes and trends underlying corrosion under electrochemical OER conditions for the important electrocatalyst materials RuO2 and IrO2 in water electrolyzers. It discusses the debated intersection between the Lattice Oxygen Evolution and metal dissolution, highlights new computational insight into the mechanism of how soluble metal species are formed, and provides recent experimental examples where the stabilization of RuO2-based OER catalysts has been accomplished successfully without compromising on activity.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Electrochemistry
Marco Etzi Coller Pascuzzi, Jan P. Hofmann, Emiel J. M. Hensen
Summary: The addition of Mn to IrO2 can enhance its electrochemical performance while maintaining stability. Mn introduces a higher electrochemically active surface and intrinsic activity, leading to improved efficiency in the oxygen evolution reaction.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Jianjun Zhou, Tian Wang, Cheng Cheng, Fan Pan, Yunqing Zhu, Hongrui Ma, Junfeng Niu
Summary: In this study, Ti/RuO2-IrO2@Pt anodes with a strong metal-support interaction (SMSI) structure were successfully fabricated and exhibited improved degradation and mineralization efficiency of PFOA during electrochemical oxidation. Moreover, the service lifetime of the Ti/RuO2-IrO2@Pt anodes was significantly extended compared to commercial Ti/RuO2-IrO2 anodes.
Article
Chemistry, Multidisciplinary
Andreas Koellisch-Mirbach, Inhee Park, Martina Hegemann, Elke Thome, Helmut Baltruschat
Summary: This study compared the oxygen reduction reaction (ORR) in Ca2+-containing dimethyl sulfoxide (DMSO) at ordered and rough electrode surfaces using various measurement techniques. It found that the formation of peroxide and superoxide differs depending on the surface structure, and the presence of a CaO/CaO2 layer can affect the reaction outcome. Additionally, the reoxidation kinetics of dissolved peroxide were shown to be sluggish, possibly due to ion pairing with Ca2+.
Article
Engineering, Environmental
Yanning Wang, Na Zhou, Yinshi Li
Summary: The study investigates the catalytic performance of single transition metal atoms embedded in two-dimensional BC3 as active sites for ORR and OER, revealing that Fe-N-4 and Mn-N-4 sites exhibit the best ORR catalytic performance, while Co-N-4 site shows the best OER catalytic performance. Through electronic structure analysis and the proposal of an adsorption factor, guidance is provided for the exploration of new high-performance single atom catalysts.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Multidisciplinary Sciences
Dafeng Zhang, Mengnan Li, Xue Yong, Haoqiang Song, Geoffrey I. N. Waterhouse, Yunfei Yi, Bingjie Xue, Dongliang Zhang, Baozhong Liu, Siyu Lu
Summary: In this study, a zinc-doped RuO2 nanowire array electrocatalyst with outstanding catalytic performance for oxygen evolution reaction under acidic conditions was reported. Experimental and theoretical investigations revealed a synergistic effect of Zn dopants and oxygen vacancies on regulating the binding configurations of oxygenated adsorbates, resulting in an alternative Ru-Zn dual-site oxide path of the reaction. This led to significantly enhanced catalytic activity and stability.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Huibin Li, Yinzhi Pan, Lei Wu, Rui He, Zirong Qin, Shasha Luo, Lijun Yang, Jianhuang Zeng
Summary: This work reports the oxygen evolution reaction (OER) performance of nanosized iridium oxide-nanosheet-like electrocatalysts synthesized by a modified Adams method. By introducing cysteamine hydrochloride during the synthesis process, the morphology of the iridium oxide transformed from spherical particles to nanosheet-like structure. The electrochemical evaluation results show that the IrO2 synthesized at 400°C exhibits the best performance in terms of enhanced mass activity and lower overpotential compared to counterparts prepared at other temperatures. Ta2O5 was further incorporated to improve the stability of iridium oxide, and the optimized IrO2-Ta2O5 nanosheets with a 7:3 M ratio of Ir/Ta outperform the commercial IrO2 benchmark in terms of OER activity and stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Tim Weber, Vedran Vonk, Daniel Escalera-Lopez, Giuseppe Abbondanza, Alfred Larsson, Volkmar Koller, Marcel J. S. Abb, Zoltan Hegedues, Thomas Baecker, Ulrich Lienert, Gary S. Harlow, Andreas Stierle, Serhiy Cherevko, Edvin Lundgren, Herbert Over
Summary: The anodic corrosion behavior of 50 angstrom thick single-crystalline IrO2 (110) films supported on slightly bulk-reduced TiO2 (110) single crystals during acidic water splitting was studied using a combination of synchrotron-based high-energy X-ray reflectivity (XRR) and surface X-ray diffraction (SXRD) with inductively coupled plasma mass spectrometry (ICP-MS). The operando synchrotron-based X-ray scattering techniques proved to be surprisingly sensitive to Ir corrosion, revealing differences in dissolution rate compared to ICP-MS experiments, which may have implications for hydrogen production coupled to intermittent energy sources.
Article
Chemistry, Physical
Sudarshan Vijay, Georg Kastlunger, Joseph A. Gauthier, Anjli Patel, Karen Chan
Summary: Determining and calculating potential-dependent energetics is crucial for understanding electrochemical reaction mechanisms. While methodologies for evaluating reaction thermodynamics have been established, simulating the corresponding kinetics remains challenging.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Abhinav S. Raman, Annabella Selloni
Summary: This study investigates the hydration structure, proton transfer mechanisms, and acid-base properties of the rutile IrO2(110)-water interface using ab initio based deep neural-network potentials and enhanced sampling simulations. The proton affinities of different surface sites are characterized, and a point of zero charge is obtained. Results show a large fraction of adsorbed water dissociation and a short lifetime of resulting hydroxy groups due to rapid surface proton exchanges, supporting recent experimental findings that the rate-determining step in the oxygen evolution reaction may not involve proton transfer into solution.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Chemistry, Physical
Qian Zhang, Lufan Zheng, Fangwei Gu, Jinting Wu, Jian Gao, Yong-Chao Zhang, Xiao-Dong Zhu
Summary: This article systematically describes the synthesis, characterization and catalytic mechanism of single-atom catalysts (SACs) for acidic oxygen reduction reactions (ORR) to produce hydrogen peroxide (H2O2). It highlights important activity descriptors, particularly the regulation methods for binding energy of oxygenated intermediates. The challenges and outlooks of using SACs for acidic ORR to H2O2 are also discussed.