Article
Chemistry, Multidisciplinary
Xuejuan Zou, Shuping He, Xi Kang, Shuang Chen, Haizhu Yu, Shan Jin, Didier Astruc, Manzhou Zhu
Summary: Two novel nanoclusters, M1Ag21 (M = Au/Ag), were synthesized and characterized using dppf as an activating ligand. These nanoclusters, supported on activated carbon, demonstrated efficient catalytic activity for the oxygen reduction reaction in alkaline solutions. The catalytic activities were attributed to the ensemble synergy effect between the M-13 kernel and dppf ligand in M1Ag21, as verified by density functional theory calculations.
Article
Chemistry, Physical
Mengmeng Jin, Wei Liu, Jiaqiang Sun, Xinzhong Wang, Shusheng Zhang, Jun Luo, Xijun Liu
Summary: This study demonstrates an active and stable catalyst composed of highly dispersed Ag nanoclusters on N-doped hollow carbon spheres, which can effectively reduce O-2 molecules into H2O2 with high selectivity and durability in acidic media.
Article
Chemistry, Multidisciplinary
Sangjin Choi, Hyung Wan Do, Dana Jin, Sungsoon Kim, Jeongyoub Lee, Aloysius Soon, Jooho Moon, Wooyoung Shim
Summary: The study found that the adsorption of gaseous oxygen molecules at the liquid-solid phase boundary is the physical rate-limiting step of the oxygen reduction reactions (ORR), and the formation of a gas-liquid-solid triple-phase boundary (TPB) helps accelerate the reaction kinetics. This was experimentally confirmed and demonstrated in aluminum-air batteries, showing remarkable electrochemical performance achieved using hierarchical pores of sparked reduced graphene oxide to form the TPB. These findings suggest maximizing the TPB can accelerate the ORR kinetics, especially in aluminum-air batteries.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Hong-Ling Meng, Shi-Yi Lin, Jiu-Ju Feng, Lu Zhang, Ai-Jun Wang
Summary: Herein, ultrafine FeNi/(FeNi)₉S-₈ nanoclusters encapsulated in nitrogen, sulfur-codoped graphitic carbon nanosheets (FeNi/(FeNi)₉S-₈/N,S-CNS) were synthesized. The as-prepared nanoclusters showed excellent electrocatalytic activity and stability for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Hong Li, Xinxin Shu, Peiran Tong, Jihui Zhang, Pengfei An, Zhengxing Lv, He Tian, Jintao Zhang, Haibing Xia
Summary: Fe-Ni ANC@NSCA catalysts anchored on N, S co-doped carbon aerogel were successfully prepared by optimal pyrolysis of polyaniline aerogels derived from the freeze-drying of PANI hydrogels obtained by the polymerization of aniline monomers in the co-presence of tannic acid, Fe3+, and Ni2+ ions. These catalysts showed excellent performance in both oxygen reduction reaction and oxygen evolution reaction, surpassing state-of-the-art commercial catalysts.
Article
Multidisciplinary Sciences
Jong Min Kim, Ahrae Jo, Kyung Ah Lee, Hyeuk Jin Han, Ye Ji Kim, Ho Young Kim, Gyu Rac Lee, Minjoon Kim, Yemin Park, Yun Sik Kang, Juhae Jung, Keun Hwa Chae, Eoyoon Lee, Hyung Chul Ham, Hyunchul Ju, Yeon Sik Jung, Jin Young Kim
Summary: A three-dimensionally customized, multiscale Pt nanoarchitecture demonstrated superior performance and durability compared to commercial Pt/C materials in fuel cells. The study suggests that controlling the structure through precision engineering of reaction surfaces and mass transfer can lead to the design and fabrication of high-performance electrocatalysts.
Article
Chemistry, Multidisciplinary
Weijuan Zhai, Senhe Huang, Chenbao Lu, Xiannong Tang, Longbin Li, Bingyu Huang, Ting Hu, Kai Yuan, Xiaodong Zhuang, Yiwang Chen
Summary: This study presents a strategy to modulate the microenvironment of single atomic centers and boost the catalytic activity of Fe-N-C catalysts. The N/S co-doped porous carbons exhibit rich Fe-active sites and deliver impressive ORR activity and excellent performance in zinc-air batteries.
Article
Chemistry, Physical
Mengjie Ma, Yi Zhang, Yujin Ji, Qi Shao, Kui Yin, Wenxiang Zhu, Junjun Yang, Fan Liao, Zhenglong Fan, Yang Liu, Youyong Li, Mingwang Shao, Zhenhui Kang
Summary: This study reports a versatile strategy for enhancing the catalytic activity and anti-poisoning ability of noble metal catalysts towards ORR by decorating them with size-controlled silicon nanoclusters (DS). DS-Pd exhibits superior ORR performance and enhanced anti-poisoning performance compared to commercial catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Nanoscience & Nanotechnology
Xuanzhao Lu, Zhuo Liu, Jian-Rong Zhang, Yang Zhou, Linlin Wang, Jun-Jie Zhu
Summary: The challenge in designing bio-chemical hybrid catalysts is the inability to maintain the initial catalytic performance of bio-catalysts or chemical catalysts. We report a general method for synthesizing bio-chemical hybrid catalysts using a natural enzyme scaffold-confined metal nanocluster. The enzyme-confined metal nanocluster hybrid catalyst shows improved catalytic performance due to the synergistic effect.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Physical
Michal Carda, Daniel Budac, Martin Paidar, Karel Bouzek
Summary: This review summarizes recent progress in understanding the oxygen reduction and evolution reactions at the lanthanum strontium manganite electrode of a high-temperature solid oxide cell. Information provided here considers the defect chemistry of lanthanum strontium manganite and its impact on the electrode reaction mechanisms. By combining literature information on both reactions, a modified reaction mechanism for the oxygen evolution reaction is proposed based on recent experimental observations and theoretical findings.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Chemistry, Physical
Nishchal Bharadwaj, Sandeep Das, Biswarup Pathak
Summary: This study proposes a new efficient ORR/OER electrocatalyst for Li-air batteries, pristine copper core-shell Pt-based nano clusters, with different morphologies and varied surface distribution of platinum atoms and facets. It provides insights into the controllability of ORR/OER activity by regulating the morphology of nano clusters, and opens up new research and application directions.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Environmental
Yishu Qiu, Zheng Hu, Hui Li, Qianqian Ren, Yanan Chen, Shi Hu
Summary: In this study, Ag/Co/C hybrid electrocatalyst for oxygen reduction reaction (ORR) was successfully synthesized via radiative flash Joule heating. The hybrid catalyst exhibits higher activity and stability in alkaline media compared to commercial Pt/C due to the strong interaction between silver and cobalt.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Xuekun Jin, Minghua He, Fengjuan Chen, Kezhi Li, Junyong Min, Ziyu Wang, Junhua Li, Jianjun Chen
Summary: In order to achieve practical application of MnO2-based oxygen reduction electrocatalysts, the slow electrochemical kinetics and low stabilities must be resolved. In this work, alpha-MnO2 nanorods intercalated by Ag+ and decorated by trace amounts of Cr(OH)3 were designed to improve the electrocatalytic activity. The resulting catalysts exhibited efficient oxygen reduction reaction activity and a more durable performance compared to Pt/C catalysts. The excellent electrocatalytic activity was attributed to the synergistic effects between MnO2, Ag+ and Cr(OH)3.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Ji-Qiang Fan, Kehui Cen, Hua-Jun Xu, Hai-Yang Wang, Ying Yang, Ze-Min Zhu, Hao Liu, Dengyu Chen, Weigang Fan, Man-Bo Li
Summary: This study synthesized four carbonyl metal nanoclusters through a photochemical reduction-oxidation cascade process and compared their catalytic performance. The results showed that these nanoclusters have oxidative resistance and structural stability, and their catalytic activity is dependent on the ring size.
Article
Chemistry, Physical
Jianan Chen, Zhenyu Wang, Jianjun Mao, Chang Liu, Yue Chen, Zhouguang Lu, Shien-Ping Feng
Summary: The study successfully synthesized a bimetallic Ag-Cu nanostructure using the cyclic scanning electrodeposition method and systematically investigated its catalytic performance for the oxygen reduction reaction in alkaline media. The results showed that the Ag-Cu nanostructure exhibited competitive catalytic ability, with a close to four electrons transfer number, which was attributed to the widely distributed Ag-Cu steps formed by decorating Cu atoms on the Ag nanosheets.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Ieva A. Cechanaviciute, Rajini P. Antony, Olga A. Krysiak, Thomas Quast, Stefan Dieckhoefer, Sascha Saddeler, Pascal Telaar, Chen Yen-Ting, Martin Muhler, Wolfgang Schuhmann
Summary: Multi-metal electrocatalysts offer a wide range of catalytic possibilities through synergistic element interactions. This study presents a polymer/metal precursor spraying technique that enables the production of diverse multi-metal catalyst materials. The synthesized catalysts, including CoNiFeMoCr, were characterized and tested for the oxygen evolution reaction (OER). The CoNiFeMoCr catalyst exhibited a polycrystalline structure, and operando Raman measurements indicated the involvement of multiple active sites. Additionally, CoNiFeMoCr electrodes supported by Ni foam were utilized for water splitting in flow-through electrolysis cells and alkaline membrane electrode assembly (MEA) configurations, showing promising performance with high current densities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Emmanuel Batsa Tetteh, Dimitrios Valavanis, Enrico Daviddi, Xiangdong Xu, Carla Santana Santos, Edgar Ventosa, Daniel Martin-Yerga, Wolfgang Schuhmann, Patrick R. Unwin
Summary: The study focuses on the material for Li-ion batteries and develops a combination method of scanning electrochemical cell microscopy and in situ optical microscopy for high-throughput charge/discharge analysis of single TiO2 nanoparticle clusters. The research reveals that TiO2 with a size of approximately 50 nm can store over 30% of the theoretical capacity at an extremely fast charge/discharge rate. This finding strengthens the potential of TiO2 for fast-charging batteries and the research method can be widely applied for electrochemical screening of nanostructured materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Jana M. Becker, Anna Lielpetere, Julian Szczesny, Sabrina Bichon, Sebastien Gounel, Nicolas Mano, Wolfgang Schuhmann
Summary: A new redox polymer/bilirubin oxidase-based gas diffusion electrode has been developed as a non-current and non-stability limiting biocathode in a glucose/O2 biofuel cell, serving as a self-powered glucose biosensor.
BIOELECTROCHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Panpan Wang, Anna Frank, Fangyuan Zhao, Marc M. Nowaczyk, Felipe Conzuelo, Wolfgang Schuhmann
Summary: The use of multilayered PSI monolayers can improve the performance of PSI-based biodevices by maximizing light absorption. However, the small loading of immobilized PSI molecules limits their practical application.
BIOELECTROCHEMISTRY
(2023)
Article
Biophysics
Kavita Jayakumar, Anna Lielpetere, Daniel A. Domingo-Lopez, Ruth E. Levey, Garry P. Duffy, Wolfgang Schuhmann, Donal Leech
Summary: Foreign body response (FBR) is a challenge for implantable biosensors and medical devices. Zwitterionic polymers (ZPs) show promise in reducing biofouling. A ZP containing MPC was found to effectively resist fibrinogen adsorption and fibroblast adhesion, while maintaining sensor performance.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Swapnil Varhade, E. B. Tetteh, Sascha Saddeler, Simon Schumacher, H. B. Aiyappa, Georg Bendt, Stephan Schulz, Corina Andronescu, Wolfgang Schuhmann
Summary: Scanning electron microscopy and atomic force microscopy images of droplet landing sites are correlated with the electrocatalytic activity for the oxygen evolution reaction in alkaline electrolyte of hexagonal spinel Co3O4 nanoparticles derived using scanning electrochemical cell microscopy. The turnover frequency (TOF) of surface Co atoms is used to deconvolute the intrinsic catalytic activity of individual crystal facets of the hexagonal Co3O4 spinel particle. The top surface exposing 111 crystal planes showed a thickness-dependent TOF, while the edge of the particle exposing (110) planes showed a higher average TOF and no correlation with particle thickness.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Xin Wang, Wenhui He, Jialin Shi, Joao R. C. Junqueira, Jian Zhang, Stefan Dieckhoefer, Sabine Seisel, Debanjan Das, Wolfgang Schuhmann
Summary: In this study, an Ag-Bi2O3 hybrid nanofiber was developed for highly efficient electrochemical reduction of CO2 to formate. The Ag-Bi2O3 catalyst exhibited a formate selectivity of over 90%, and achieved a yield rate of 11.7 mmol·s(-1)·m(-2) at a current density of -250 mA·cm(-2). The presence of Ag in the catalyst increased the energy efficiency by nearly 10% compared to a Bi2O3 only counterpart, and this enhancement was attributed to the conversion of Bi2O3 from a monoclinic phase to a metastable tetragonal phase and the accelerated formation of active metallic Bi at low overpotentials.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Ellen Suhr, Olga A. Krysiak, Valerie Strotkoetter, Felix Thelen, Wolfgang Schuhmann, Alfred Ludwig
Summary: High-entropy nitrides are a class of unexplored materials with good mechanical properties, high stability against chemicals, and promising electrocatalytic performance. In this study, a high-entropy nitride system (Ti-Co-Mo-Ta-W)N is investigated, which combines binary and ternary nitrides showing good water-splitting activities. Thin-film materials libraries with continuous composition spreads are deposited using reactive cosputter deposition. The films exhibit a single-phase solid solution structure and low resistivity values. The oxygen evolution reaction activity of the (Ti-Co-Mo-Ta-W)N films is measured, and the results indicate that stability is a challenge for high-entropy nitrides in oxygen-related electrocatalytic reactions. The reactive sputtering method is used to prepare high-entropy nitride materials libraries, which serve as a test platform for studying the stability of nitride films during catalytic applications.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Muhammad Adib Abdillah Mahbub, Joao R. C. Junqueira, Xin Wang, Jian Zhang, Stefan Dieckhoefer, Sabine Seisel, Debanjan Das, Wolfgang Schuhmann
Summary: A facile strategy of using 2-methyl-imidazole coordinated to Bi to boost CO2 reduction to formate with high selectivity and activity is reported.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Moonjoo Kim, Emmanuel Batsa Tetteh, Olga A. Krysiak, Alan Savan, Bin Xiao, Tobias Horst Piotrowiak, Corina Andronescu, Alfred Ludwig, Taek Dong Chung, Wolfgang Schuhmann
Summary: Using scanning electrochemical cell microscopy (SECCM), the PZC and HER activities of various elemental compositions of a Pt-Pd-Ru-Ir-Ag thin-film HEA materials library (HEA-ML) were determined. The PZC of Pt-Pd-Ru-Ir-Ag is linearly correlated with its composition-weighted average work function. The HER current density in acidic media positively correlates with the PZC, which can be explained by the preconcentration of H+ in the electrical double layer at potentials negative of the PZC.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Christian M. Clausen, Olga A. Krysiak, Lars Banko, Jack K. Pedersen, Wolfgang Schuhmann, Alfred Ludwig, Jan Rossmeisl
Summary: Compositionally complex materials, such as high-entropy alloys and oxides, have the potential to be efficient catalyst platforms due to their vast chemical space. However, determining the composition of active catalyst materials requires understanding the descriptor-activity relationship, which is challenging experimentally. In this study, we show that inferred adsorption energy distributions on complex solid solution surfaces can predict the electrocatalytic performance of oxygen reduction reaction in the Ag-Pd-Pt-Ru system with high accuracy.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Alexander Gunnarson, Thomas Quast, Stefan Dieckhoefer, Norbert Pfaender, Ferdi Schueth, Wolfgang Schuhmann
Summary: This study investigates the stability of catalysts in Proton Exchange Membrane Fuel Cells (PEMFCs). The research finds that the degradation of catalysts is accelerated due to locally different pH values. It also raises concerns about the applicability of accelerated stress tests for evaluating catalyst stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Electrochemistry
Ann Cathrin Brix, Olga A. Krysiak, Ieva A. Cechanaviciute, Gal Bjelovucic, Lars Banko, Alfred Ludwig, Wolfgang Schuhmann
Summary: This article discusses the potential of using an alternative anode reaction to produce green hydrogen and convert lignin into valuable chemicals. The use of pulse electrolysis and scanning droplet cell-assisted screening are explored as methods to enhance the efficiency and selectivity of the electrochemical processes.
Article
Chemistry, Physical
Ridha Zerdoumi, Alan Savan, Marshal Amalraj, Emmanuel Batsa Tetteh, Florian Lourens, Olga A. Krysiak, Joao R. C. Junqueira, Alfred Ludwig, Wolfgang Schuhmann
Summary: Alloying dissimilar elements is an effective strategy for enhancing the electrocatalytic properties of multi-metal materials, by modifying electronic and geometric effects. This research investigates the interplay between these parameters using the quaternary PdAgCuFe thin-film system, and establishes a correlation between valence electron density and catalytic activity.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Carla Santana Santos, Martina Romio, Yuri Surace, Nicolas Eshraghi, Marco Amores, Andreas Mautner, Christiane Groher, Marcus Jahn, Edgar Ventosa, Wolfgang Schuhmann
Summary: Magnesium-ion batteries are seen as environmentally sustainable, cheaper, and safer alternatives to lithium-ion systems. However, the formation of native solid electrolyte interphases (n-SEIs) due to spontaneous electrolyte decomposition affects the performance of these batteries. In this study, scanning electrochemical microscopy (SECM) was used to measure the electronic properties of n-SEIs, revealing the influence of different electrolyte compositions on their conductivities.
