This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:


peer-reviewed publication

trusted source


Examining challenges in green hydrogen production: Study finds hydrogen effects that produce bottleneck

Unveiling challenges in green hydrogen production
Graphical abstract. Credit: ACS Energy Letters (2023). DOI: 10.1021/acsenergylett.3c00842

The quest for hydrogen as a clean and sustainable energy source has gained momentum. To produce green hydrogen, water must be split into oxygen and hydrogen. This water splitting process is facilitated by electrocatalysts that enhance the chemical reaction rate.

Ideally, a is neither changed nor degraded by the reaction, and for electrolyzers this becomes critical as the electrocatalysts account for 50% of its total cost. As a result, their efficiency and lifetime are critical to the future availability of green and thus to a carbon-free economy. A team of researchers led by the Max-Planck-Institut für Eisenforschung (MPIE) has discovered why these catalysts actually deteriorate and suffer from a shorter life expectancy.

Their work shows that the produced hydrogen itself is the bottleneck. The scientists have now published their findings in the journal ACS Energy Letters.

Effects of hydrogen on catalytic performance

Previous research primarily focused on optimizing catalyst performance, without atomic-level analysis. However, the Max Planck team took a different approach.

"Our findings revealed that impurities do get introduced during synthesis. Surprisingly, we discovered that boron impurities could enhance the catalyst's performance by expanding its lattice structure. However, we observed that the decreases after a certain amount of hydrogen is produced and wanted to understand why this happens to find ways to maintain the performance," explains Prof. Baptiste Gault, corresponding author of the publication and head of the group "Atom Probe Tomography" at MPIE.

Atom probe tomography and simulations based on density functional theory revealed that as hydrogen accumulates on the catalyst's surface, boron is gradually removed from the lattice structure. This interaction deteriorates the catalyst's performance, by decreasing the concentration of boron dopants.

"Our findings show that it is not enough to increase the catalytic activity with Boron as a dopant. We must find solutions to shield Boron inside the catalyst's from the hydrogen produced on the surface of the catalyst," says Prof. Se-Ho Kim, second corresponding author of the publication, former postdoctoral researcher at MPIE and now assistant professor at Korea University.

More information: Su-Hyun Yoo et al, Dopant Evolution in Electrocatalysts after Hydrogen Oxidation Reaction in an Alkaline Environment, ACS Energy Letters (2023). DOI: 10.1021/acsenergylett.3c00842

Journal information: ACS Energy Letters

Provided by Max Planck Society

Citation: Examining challenges in green hydrogen production: Study finds hydrogen effects that produce bottleneck (2023, August 31) retrieved 11 December 2023 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Team develops highly active catalyst for alkaline water electrolysis using boron and sulfur


Feedback to editors