Article
Electrochemistry
Bilal Danisman, Gui-Rong Zhang, Adrian F. Baumunk, Juntao Yang, Olaf Brummel, Philipp Darge, Karl J. J. Mayrhoferhttps, Joerg Libuda, Marc Ledendecker, Bastian J. M. Etzold
Summary: This study demonstrates that the pretreatment of PtNiMo/C catalysts strongly influences their activity. The commonly used cyclic voltammetry response descriptor fails to accurately portray the complete surface restructuring, leading to an incorrect impression of stable activity. In-situ FTIR and online dissolution measurements reveal a previously overlooked high activity of the trimetallic catalysts. The maximum activity and change in activity over the cycle number are affected by the scan rate and electrolyte refreshing, while the gas atmosphere has minimal impact. This exemplary study has implications for Pt alloy catalysts in general.
Article
Chemistry, Physical
Ye Peng, Ja-Yeon Choi, Liliang Tian, Kyoung Bai, Yi Zhang, Dongchu Chen, Jianhuang Zeng, Dustin Banham
Summary: The distribution of platinum group metal (PGM) nanoparticle catalysts in the carbon support significantly affects the catalyst's performance. The placement of Pt either on the outer surface or within the pores of the carbon results in different activity and performance at high current densities. To gain further insight into the catalyst's properties, a relationship between Pt distribution and relative humidity (RH) tolerance is explored. This work provides valuable information for MEA designers in selecting catalysts for specific applications.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Applied
Fabrizio Sordello, Pelagia-Nefeli Prantsidou-Georgiadou, Emanuele Azzi, Yannick Tschauder, Dario Formenti, Francesco Pellegrino, Polyssena Renzi
Summary: In this study, titanium-based tetrapyrazinoporphyrazines were identified as a valuable alternative to noble metals in the oxygen reduction reaction (ORR). By modifying the synthetic conditions, the ORR selectivity can be tuned, and it was shown that introducing substituents on the macrocycle periphery is detrimental to the complex's ability to reduce molecular oxygen. Electrochemical characterization and rotating ring-disk electrode measurements were conducted to evaluate the possibility of selectively switching the reduction product during complex synthesis.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Ajay S. Bangwal, Manisha Chauhan, Prabhakar Singh
Summary: A series of double perovskite oxide materials were synthesized and their catalytic activity in alkaline medium was investigated. The results show that these materials exhibit catalytic activity for both oxygen evolution reaction (OER) and oxygen reduction reactions (ORR). Among them, Pr0.90Ba1.10Co2O6-δ shows the best activity in OER.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Yan Dong, Yang Liu, Yuanyuan He, Zhuoyao Chen, Jing Chen, Yuki Orikasa, Yoshiharu Uchimoto, Xiaoming Wang
Summary: By cyclic-voltammetry treatment, the facet orientation of Pd(c) is tuned to (111), resulting in significantly enhanced electrocatalytic activity of Pt-qms in oxygen reduction reaction (ORR), exhibiting 4-fold specific activity and 9-fold mass activity compared to commercial carbon-supported Pt nanoparticles.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Review
Chemistry, Physical
Vito Di Noto, Enrico Negro, Angeloclaudio Nale, Gioele Pagot, Keti Vezzu, Plamen Atanassov
Summary: The study examined how to maximize the potential of CV-TF-R(R)DE in studying the most relevant features of oxygen reduction reaction electrocatalysts and quickly identify the most promising candidates.
CURRENT OPINION IN ELECTROCHEMISTRY
(2021)
Article
Chemistry, Analytical
Eimantas Ramonas, Marius Butkevicius, Sergey Shleev, Marius Dagys, Dalius Ratautas
Summary: The study introduces a novel concept of an enzyme-driven pH electrode system composed of two electrodes, which requires no additional counter or reference electrodes and provides high-precision real-time pH monitoring. Additionally, an in-depth mechanistic study was presented to explain the relationship between electrode potential and pH dependence, offering new insights into the operational principles of bilirubin oxidase at different pH levels.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Materials Science, Multidisciplinary
Andrey Yasinskiy, Sai Krishna Padamata, Srecko Stopic, Dominic Feldhaus, Dmitriy Varyukhin, Bernd Friedrich, Peter Polyakov
Summary: The study investigated the electrochemical decomposition of spent catalyst in molten salts for the extraction of precious metals, focusing on aluminum electrowinning from xLiF-(1-x)AlF3 melts. The results revealed a diffusion-controlled two-step process with both one-electron and two-electron reductions occurring simultaneously at close potentials. Further research is needed to optimize the process parameters for aluminum reduction during catalyst treatment and primary metal production.
Article
Chemistry, Physical
Edgardo Maximiliano Gavilan-Arriazu, Sergio A. Rodriguez
Summary: This study investigated and analyzed the oxidation mechanism of the natural pigment betanidin in depth, using computational techniques and experimental data. A complete mechanism model was proposed based on the analysis of density functional theory and simulations of cyclic voltammetry. The dimerization of oxidation products was also considered.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Anni Yu, Ruben Rizo, Francisco J. Vidal-Iglesias, Rosa M. Aran-Ais, Yan-Xia Chen, Enrique Herrero, Juan M. Feliu
Summary: Information on the chemical adsorption and surface oxidation of Ru under electrochemical conditions is crucial for understanding the structure-activity relationship in Ru-based materials. This study investigates the adsorption of hydrogen and oxygen species on quasi-single-crystalline Ru films on Pt(111) electrodes. The formation of Ru-O and the conversion to RuO2 were observed at specific potentials. These findings provide insights into the electrochemical properties and ligand effects of Ru.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Wenjiao Ma, Tingting Liu, Chen Xu, Chengjun Lei, Pengjie Jiang, Xin He, Xiao Liang
Summary: The authors introduce a twelve-electron conversion iodine cathode for high energy density zinc-iodine batteries, achieved through interhalogen chemistry in an acidic aqueous electrolyte. This electrode provides a cycle that accelerates the kinetics and reversibility of the iodide/iodate electrode reaction.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Brendan B. Murphy, Nicholas Apollo, Placid Unegbu, Tessa Posey, Nancy Rodriguez-Perez, Quincy Hendricks, Francesca Cimino, Andrew G. Richardson, Flavia Vitale
Summary: Using vitamin C as the reducing agent, a cost-effective method to produce reduced graphene oxide coatings has been developed, significantly improving the performance and stability of multimodal microelectrodes.
Article
Electrochemistry
Dimitris Killinger, Supathorn Phongikaroon
Summary: The stability of quasi-reference electrode (QRE) materials in a NaCl-CaCl2 molten salt eutectic was investigated, with tungsten rod (1.5 mm) being determined as the most stable and repeatable option compared to platinum wires with poor stability in this system.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
Han Cheng, Renjie Gui, Hao Yu, Chun Wang, Si Liu, Hongfei Liu, Tianpei Zhou, Nan Zhang, Xusheng Zheng, Wangsheng Chu, Yue Lin, HengAn Wu, Changzheng Wu, Yi Xie
Summary: By breaking the size limitation in Pt alloy systems, subsize Pt-based intermetallic compounds can simultaneously optimize MA and durability. Furthermore, the subsize scale was found to enhance the stability of membrane electrodes, preventing catalyst poisoning by ionomers in humid fuel-cell conditions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Energy & Fuels
Mariam Khan, Naveed Kausar Janjua, Awais Ahmad, Rafael Luque, Abdullah A. Al-Kahtani, Ammar Mohamed Tighezza
Summary: The oxygen reduction and evolution reaction (ORR/OER) are crucial for energy generating and storage devices, and have an impact on various electrocatalytic reactions. The use of platinum-based electrode materials for ORR/OER is limited due to its high cost. This study investigates the ORR and OER on the surface of xAg(2)O-yPrO(2)/gamma-Al2O3/Glassy-Carbon, and finds that the addition of silver and praseodymium alters the reaction mechanism. The electrocatalysts exhibit stability and bi-functionality in alkaline media, indicating their potential as electrode materials in batteries and regenerative fuel cells.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Analytical
Meng-Ke Zhang, Wei Chen, Mian-Le Xu, Zhen Wei, Da Zhou, Jun Cai, Yan-Xia Chen
Summary: This study investigated the effect of buffer pairs on the pH shift at the electrode/electrolyte interface during electrochemical reactions in solutions of different bulk pHs. It established a quantitative relationship between pH(b), pH(b), pK(a), buffer pair concentration, and reaction current density, providing diagrams for estimating pH(s) and ΔpH, as well as guidelines for choosing appropriate buffer pairs to mitigate pH(s) shift induced by electrode reactions.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Jie Wei, Yan-Xia Chen, Olaf M. Magnussen
Summary: The phase transition of CO adlayers on Pt(111) in a 0.1 M H2SO4 electrolyte was studied using in situ high-speed scanning tunneling microscopy. The removal of CO adsorbates led to the transformation of the adlayer structure into a static (root 19 x root 19)R23.4 degrees-13CO adlayer with rotated and expanded adsorbate arrangement. The results highlight the dynamic nature of the adlayer structure changes during the process.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Fan He, Wei Chen, Bai-Quan Zhu, Er-fei Zhen, Jun Cai, Yan-Xia Chen
Summary: Organic cations such as R4N+ show varying stability during the hydrogen evolution reaction, with different reaction mechanisms possibly occurring under different conditions. The study suggests that specific R4N+ species could play a role in tuning the activity and selectivity of the CO2 reduction reaction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Xichen Zhou, Yangbo Ma, Yiyao Ge, Shangqian Zhu, Yu Cui, Bo Chen, Lingwen Liao, Qinbai Yun, Zhen He, Huiwu Long, Lujiang Li, Biao Huang, Qinxin Luo, Li Zhai, Xixi Wang, Licheng Bai, Gang Wang, Zhiqiang Guan, Ye Chen, Chun-Sing Lee, Jinlan Wang, Chongyi Ling, Minhua Shao, Zhanxi Fan, Hua Zhang
Summary: The Au@Pd core-shell nanorods with a unique fcc-2H-fcc heterophase exhibit superior electrocatalytic ethanol oxidation performance, contributing to insights into the catalytic mechanism. The exceptional performance of the heterophase Au@Pd nanorods is attributed to the unconventional 2H phase, the 2H/fcc phase boundary, and the lattice expansion of the Pd shell.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Mian Le Xu, Jie Wei, Wei Chen, Zhen Wei, Qun Xiang Li, Jun Cai, Yan-Xia Chen
Summary: Many kinetic studies on hydrogen evolution reaction (HER) have been conducted in N-2 saturated solutions to avoid H-2 leakage and resulting variations in H-2 concentration at the electrode/electrolyte interface. The results show that increasing HER current leads to higher equivalent H2 concentration and lower thermodynamic equilibrium potential. The plots of current density versus activation overpotential for HER are the same in N-2 and H-2 saturated solutions when the activation overpotential is -50 mV. It is suggested to compare HER activity in solutions with the same composition and activation overpotential rather than at the same applied potential.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Juan Wang, Jinli Yu, Mingzi Sun, Lingwen Liao, Qinghua Zhang, Li Zhai, Xichen Zhou, Lujiang Li, Gang Wang, Fanqi Meng, Dong Shen, Zijian Li, Haibo Bao, Yunhao Wang, Jingwen Zhou, Ye Chen, Wenxin Niu, Bolong Huang, Lin Gu, Chun-Sing Lee, Zhanxi Fan
Summary: The surface molecular functionalization of metal nanorods has been shown to improve the performance of electrochemical CO2 reduction reaction by enhancing selectivity and current density. This method can be extended to other nanomaterials and derivatives to boost performance.
Article
Chemistry, Multidisciplinary
Yangbo Ma, Jinli Yu, Mingzi Sun, Bo Chen, Xichen Zhou, Chenliang Ye, Zhiqiang Guan, Weihua Guo, Gang Wang, Shiyao Lu, Dongsheng Xia, Yunhao Wang, Zhen He, Long Zheng, Qinbai Yun, Liqiang Wang, Jingwen Zhou, Pengyi Lu, Jinwen Yin, Yifei Zhao, Zhongbin Luo, Li Zhai, Lingwen Liao, Zonglong Zhu, Ruquan Ye, Ye Chen, Yang Lu, Shibo Xi, Bolong Huang, Chun-Sing Lee, Zhanxi Fan
Summary: This study reports the synthesis of highly selective Ag-Cu Janus nanostructures for the electrocatalytic reduction of CO2 to multicarbon products. The Ag-Cu Janus nanostructures demonstrated superior selectivity and performance compared to Cu nanocubes. The study provides an effective strategy for designing advanced catalysts for the extensive application of CO2RR.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Da Zhou, Aimin Ge, Toshiki Kogina, Ken-ichi Inoue, Yan-Xia Chen, Shen Ye
Summary: This study investigates the interfacial structures of a Nafion/graphene composite under different humid environments using SFG vibrational spectroscopy. The results show that the Nafion thin film forms a lamellar structure on the graphene surface, with a similar orientation to that of the free Nafion/air interface. The buried Nafion/graphene interface has distinct structural differences compared to hydrophilic substrate surfaces such as fused quartz and calcium fluoride, which significantly affect water adsorption behaviors at the interface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Zhen Wei, Meng Ke Zhang, Bai Quan Zhu, Mian Le Xu, Jing Lei, Han Tang, Jun Cai, Yan-Xia Chen
Summary: This study systematically investigates the effect of pH on sulfate adsorption on Pd(111) electrode using cyclic voltammetry. It is found that the onset potential for sulfate adsorption is positively correlated to the solution pH, and in alkaline solutions, sulfate adsorption overlaps with the OHad region. By analyzing the thermodynamic equilibrium potential and the Faradic charge due to adsorption, it is proposed that SO4* is the dominating adsorbate on Pd(111), regardless of whether the main precursor is HSO4- or SO42- in the solution. This has important implications for the understanding of interfacial electrochemical processes, particularly pH-modulated electrochemical reactions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Zhen Wei, Meng Ke Zhang, Bai Quan Zhu, Jun Cai, Yan-Xia Chen
Summary: In this study, the formate adsorption and formic acid oxidation reaction on Au(111) were systematically investigated by cyclic voltammetry, with the comparison to Pt(111). The study found that the peak current for the reaction on Au(111) showed a volcano-shaped pH dependence, influenced by the changes in pH induced by the reaction. The mechanism of the reaction on Au(111) was successfully explained by considering the electric double layer effect.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Shengli Zhuang, Dong Chen, Wentao Fan, Jinyun Yuan, Lingwen Liao, Yan Zhao, Jin Li, Haiteng Deng, Jun Yang, Jinlong Yang, Zhikun Wu
Summary: This study proposes the concept of single-atom-kernelled nanoclusters and synthesizes a Pd-based trimetal nanocluster with a single-Ag atom-kernel using an alloying strategy. The nanoclusters with single-silver atom kernels exhibit higher activity and selectivity compared to the bimetal precursor nanoclusters. The single atoms in the kernel have significant influence on catalytic performance by affecting the electronic configuration.
Review
Chemistry, Physical
Wei Chen, Meng-Ke Zhang, Bing-Yu Liu, Jun Cai, Yan-Xia Chen
Summary: Studying the pH effects on electrode reactions is crucial for understanding reaction mechanisms and determining optimal reaction conditions. Correction for effects induced by local pH changes near the electrode surface is necessary when studying fast electrode reactions in neutral solutions.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Jingwen Zhou, Tianshuai Wang, Lin Chen, Lingwen Liao, Yunhao Wang, Shibo Xi, Bo Chen, Ting Lin, Qinghua Zhang, Chenliang Ye, Xichen Zhou, Zhiqiang Guan, Li Zhai, Zhen He, Gang Wang, Juan Wang, Jinli Yu, Yangbo Ma, Pengyi Lu, Yuecheng Xiong, Shiyao Lu, Ye Chen, Bin Wang, Chun-Sing Lee, Jianli Cheng, Lin Gu, Tianshou Zhao, Zhanxi Fan
Summary: This study shows that using unconventional phase nanomaterials such as 4H/face-centered cubic (fcc) iridium (Ir) nanostructures grown on a gold template can enhance reaction kinetics and improve energy efficiency in lithium-carbon dioxide (Li-CO2) batteries. This provides feasibility for the practical use of unconventional phase nanomaterials.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Atomic, Molecular & Chemical
Xuxu Ye, Bingyu Liu, Da Zhou, Yan Xia Chen
Summary: 4H gold nanowires were synthesized using colloid solution methods. The influence of removing adsorbed molecules on the crystalline phase, surface structure, and electrochemical oxidation performance was investigated. The results showed that the morphology shifted from nanowires to dumbbell-shaped nanoparticles after removing the adsorbed molecules, and the crystalline phase changed from 4H to face-centered cubic. Additionally, the CO electro-oxidation activity of the 4H Au sample was significantly improved after electrochemical cleaning.
CHINESE JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Zhen Wei, Meng Ke Zhang, Bai Quan Zhu, Jun Cai, Yan-Xia Chen
Summary: Formate adsorption and formic acid oxidation reaction (FAOR) on Au(111) have been systematically studied in solutions with 0 < pH < 14. The pH at the electrode/electrolyte interface (pHs) drops during FAOR, leading to higher FAOR currents. The peak current for FAOR at Au(111) displays a volcano-shaped pHs dependence. The H/D kinetic isotope effect factors for HCOOH/DCOOH are approximately 5. A mechanism with proper consideration of the electric double layer can explain all the data for FAOR on Au(111).
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
