Atomic Force Microscopy Webinars

Nanoelectrics at Electrified Solid/Liquid Interfaces

Get the latest solar water splitting research from the Boettcher group at University of Oregon, as well as Bruker’s recent Nanoelectrode probe and Data Cube developments.

In this two-presentation webinar, Nanoelectrics at Electrified Solid/Liquid Interfaces, our speakers discuss:

  1. The fundamental aspects and capabilities of the probes used to measure interfacial charge transfer at the semiconductor-catalyst interface – an issue that is central for solar water splitting, yet has been poorly understood.
  2. The new capabilities for nanoelectrical characterization in liquid made possible by Bruker's instruments, including: insulated nanoelectrode AFM-SECM tips (the first and only commercial solution for nanoscale electrical characterization in liquid), and electrical Data Cube modes that provide an entire force and electrical spectrum at every pixel.

View the Program Notes, below, for more detailed presentation information and timestamps.

Program Notes

[00:02:15] In the first presentation of this session:

Michael Nellist, Ph.D. (University of Oregon) explores how the pursuit of new insights in solar water splitting research require unique experimental approaches — including using nanoelectrode AFM-SECM probes, scanning the surface of at water splitting photoanodes, and making in-operando local surface potential measurements. This part of the webinar also explores interfacial charge transfer at the semiconductor-catalyst interface – an issue that is central for solar water splitting yet has been poorly understood.  In this presentation, we will discuss fundamental aspects and capabilities of the probes used. To accomplish this, the speaker reviews:

  • How the technique allows for measurement of the surface potential and thickness-dependent electronic properties of cobalt (oxy)hydroxide phosphate (CoPi).
  • The ways that, when CoPi is deposited on illuminated photoanodes like hematite (a-Fe2O3), it acts as both a hole collector and an oxygen evolution catalyst.

Moreover, the versatility of the technique is highlighted by comparing surface potentials of CoPi-decorated hematite and bismuth vanadate photoelectrodes.

 

[00:32:00] In the second part of the session:

Dr. Teddy Huang (Bruker) explores why nanoscale electrical measurements with AFM are common in air, yet extremely challenging in liquid, as well as the new capabilities for nanoelectrical characterization in liquid provided by Bruker's AFM instruments.

At Bruker, we recently developed insulated nanoelectrode AFM-SECM tips, which provide the first and only commercial solution for nanoscale electrical characterization in liquid. In addition, we have also introduced an extensive set of new electrical Data Cube modes that provide an entire force and electrical spectrum at every pixel.

This webinar demonstrates how the combination of these two innovations enables a whole range of new electrical measurements in liquid, including in situ piezoelectric response, conductivity, Kelvin Probe mapping, and benefits for research in solar water splitting. We show data addressing applications ranging from Li-ion batteries, electrocatalysis, to semiconductors and bioelectricity.

 

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This webinar was presented on: June 7, 2018

Speakers

Dr. Teddy Huang

Staff Development Applications Scientist, Bruker Nano Surfaces

Dr. Huang obtained his PhD degree in physical chemistry from Emory University in 2012. After graduation, he worked for Prof. Nathan Lewis at Caltech as a postdoctoral scholar, where he investigated the semiconductor/metal interfacial structure using AFM nanoelectric measurements. He joined in Bruker in 2014 and now leads the team for development of AFM-based electrical and electrochemical applications. As of today, he has published 43 peer-reviewed articles with more than 2300 citations and an H-index of 22.

Michael Nellist

Ph.D. student, University of Oregon

Michael Nellist is a Ph.D. student in Prof. Shannon Boettcher’s lab at the University of Oregon. His graduate work has been focused on better understanding the charge transfer processes that take place at the semiconductor-catalyst interface at photoanodes for water splitting. Michael earned his B.S. in Chemistry from SUNY Geneseo.