Nano- and microelelctroanalytic methods for understanding electrocatalysts

ABSTRACT

During the last decade tools for single-entity electrochemistry were instrumental to provide in- depth insight into electrocatalytic reactions at the nanoscale. This is mainly due to the possi- bility of determining intrinsic electrocatalytic properties of a given material avoiding any con- volution with ensemble properties, and the influence of diffusional limitations or additives.

In this presentation, I will present a journey from the development of nanoelectrochemical tools, including scanning electrochemical microscopy (SECM), scanning electrochemical cell micros- copy (SECCM), and single-entity electrochemistry (SEE) to applications in electrocatalysis. This will include, the

1. determination of the local pH value at the interface of an electrocatalyst-modified electrode, gas-diffusion electrodes, and MEA electrodes during high current density oxygen evolution, hydrogen evolution, or CO2 reduction using shearforce-based SECM.^[1]
2. identical location TEM/single-nanoparticle-at-the-nanoelectrode techniques for the elucidation of the intrinsic activity of electrocatalysts^[2,3]
3. Long-range SECCM for high-throughput screening of electrocatalysts.^[4]

Acknowledgements: These projects would not have been possible without the contribution of many coworkers over the years including S. Dieckhöfer, E. B. Tetteh, M. Kim, S. Varhade, G. Arruda de Oliveira, J. Zhang, C. Santana Santos, T. Quast, O. Krysiak, W. He, T. Erichsen, T. Tarnev as well as cooperation partners including C. Andronescu, P. Unwin, A. Ludwig. The work has received funding from European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (CasCat [833408]), the Deutsche Forschungsgemeinschaft (DFG) in the framework of the research unit FOR 2397e2 (276655237), the research unit FOR 2982 (413163866), the CRC247 [388390466], and Germany’s Excellence Strategy–EXC 2033-390677874-RESOLV.

References:

[1] S. Dieckhöfer, D. Öhl, J. R. C. Junquiera, T. Quast, T. Turek, W. Schuhmann, Chem. Eur. J. 27 (2021) 5906-5912. b) L. Li, N. Limani, R. Antony, S. Dieckhöfer, C. Santana Santos, W. Schuhmann, Small Sci. 4 (2024) 2300283. c) R. P. Antony, L. Li, C. Santana Santos, N. Limani, S. Dieckhöfer, T. Quast, J. Weidner, W. Schuhmann, ACS Mater. Lett. 6 (2024) 5333-5339.

[2] T. Quast, H. Barike Aiyappa, S. Saddeler, P. Wilde, Y.-T. Chen, S. Schulz, W. Schuhmann, Angew. Chem. Int. Ed. 60 (2021) 3576-3580. b) T. Quast, S. Varhade, S. Saddeler, Y.-T. Chen, C. Andronescu, S. Schulz, W. Schuhmann, Angew. Chem. Int. Ed. 60 (2021) 23444-23450. c) J. Zhang, T. Quast, W. He, S. Dieckhöfer, J. R. C. Junqueira, D. Öhl, P. Wilde, D. Jambrec, Y.-T. Chen, W. Schuhmann, Adv. Mater. 34 (2022) 2109108.

[3] J. Zhang, W. He, T. Quast, J. R. C. Junqueira, S. Saddeler, S. Schulz, W. Schuhmann, Angew. Chem. Int. Ed. 135 (2023) e202214830.

[4] E. B. Tetteh, O. A. Krysiak, A. Savan, M. Kim, R. Zerdoumi, T. D. Chung, A. Ludwig, W. Schuhmann, small methods 7 (2023) 2301284. b) G. Arruda de Oliveira, M. Kim, C. Santana Santos, N. Limani, T. D. Chung, E. Batsa Tetteh, W. Schuhmann, Chem. Sci. 15 (2024) 16331- 16337. c) R. Zerdoumi, T. Quast, E. B. Tetteh, M. Kim, L. Li, S. Dieckhöfer, W. Schuhmann, Anal. Chem. 96 (2024) 10886-10892. d) E. B. Tetteh, M. Kim, A. Savan, A. Ludwig, T. D. Chung, W. Schuhmann, Cell Rep. Phys. Sci. 4 (2023) 101680.

BIO

Date of birth: October 10, 1956

Ruhr-University Bochum; Analytical Chemistry and Center for Electrochemical Sciences (CES) Universitätsstr. 150; NC04/788; D-44780 Bochum

+49 234 32 6200; Internet: www.rub.de/elan; email: wolfgang.schuhmann@rub.de

Scientific Vita

1982 Diploma (Chemistry), University of Karlsruhe (Prof. Dr. Gerhard Fritz)

1987 PhD (Physical Chemistry), Technical University Munich (Prof. Dr. Friedhelm Korte)

1987 - 1995 Group leader "Amperometric Biosensors", Technical University Munich (Prof. Dr. Hanns-Ludwig Schmidt)

1990 Visiting scholar at University of Texas, Austin (Prof. Dr. Adam Heller)

1993 Habilitation (Chemistry) Technical University Munich (Prof. Dr. Hanns-Ludwig Schmidt)

1996 - 2008 Assoc. Prof. of Analytical Chemistry, Ruhr-University Bochum

2008 - present Full Professor and Chair of Analytical Chemistry, Ruhr-University Bochum

Awards

2000 Biosensors & Bioelectronics Award

2005 Fellow of the Royal Society of Chemistry (FRSC)

2008 Julius-von-Haast Fellowship Award of the Royal Society of New Zealand and the Humboldt Foundation

2011 Katsumi-Niki-Award of the International Society of Electrochemistry (ISE)

2012 Fellow of the International Society of Electrochemistry (ISE)

2014 Howard Fellowship of the University of New South Wales, Sydney

2014 Heyrovsky-Ilkovic-Nernst-Lecture of the GDCh, the Czech and the Slovak Chemical Societies

2016 Distinguished Visiting Professor, University of Medicine and Pharmacy “Iuliu Hatieganu”, Cluj-Napoca, Romania

2017 “Schulich Visiting Professor Lectureship” for 2018-19; Schulich Faculty of Chemistry at the Technion - Israel Institute of Technology; Haifa; Israel

2018 Alessando Volta Medal of the Electrochemical Society (ECS)

2019 Giulio Milazzo Prize of the Bioelectrochemical Society (BES)

2019 ERC Advanced Grant (European Research Council)

Member of Scientific Societies: GDCh, RSC, ECS, ISE, BES, AGEF, GeCatS

Professional Activities

2007 - 2008 Chair of Division 2 “Bioelectrochemistry” of the International Society of Electrochemistry

2007 - 20100 Dean of the Faculty of Chemistry and Biochemistry, Ruhr-University Bochum

2010 - 2012 Vicedean of the Faculty of Chemistry and Biochemistry, Ruhr-University Bochum

2009 Chair of the Research Department „Interfacial Systems Chemistry“, Ruhr-University Bochum

2005 - 2023 Member and chair of the Board of AGEF “Arbeitsgemeinschaft elektrochemischer Forschungsinstitute”

Member of the Editorial Boards of “Biosensors & Bioelectronics”, “Electroanalysis”, “ChemPlusChem”, “ChemElectroChem (Chair of the Board)”, “Langmuir”, “Curr. Opin. Electrochem.”, “Angewandte Chemie (International Advisory Board)”

Fields of Interests and Current Research Projects

Micro- and nanoelectrochemistry; development of tools for microelectrochemistry (scanning electroche- mical microscopy (SECM); scanning electrochemical cell microscopy (SECCM)); electrochemical robotics und combinatorial electrochemistry; modified electrodes for biosensors, biofuel cells, Li batteries, SECM and SECCM for battery applications; Zn-air batteries; photoelectrochemistry; materials chemistry, high- throughput catalyst discovery; scanning droplet cell (SDC) and optical scanning droplet cell (OSDC); noble-metal free electrocatalysts; high-entropy materials; electrocatalysts for hydrogen evolution, oxygen reduction, oxygen evolution, alcohol oxidation, HMF oxidation, CO2 reduction, NOx reduction; gas- diffusion electrodes; fuel cells; electrolyzers; energy conversion reactions

Total number of refereed publications (according to ISI Web of Science; 05.12.2024): 882;

sum of times cited: 40,192; h-index: 95; Google scholar: sum of times cited: 50,324; h-index 108