High-performance large area electrode system developed for artificial photosynthesis

July 20, 2020

A research team, led by Dr. Hyung-Suk Oh and Dr. Woong Hee Lee of the Clean Energy Research Center of the Korea Institute of Science and Technology (KIST), working in cooperation with the Technische Universität Berlin (TUB), announced that they had developed a nano-sized, coral-shaped silver catalyst electrode and large-area, high-efficiency carbon dioxide conversion system, which can be used to obtain *carbon monoxide. In recent years, this type of electrochemical carbon dioxide conversion system has been a major area of research in the field of artificial photosynthesis.

* Carbon monoxide: Chemically stable and can be used as a reducing agent at high temperatures, and thus can be used in chemical, metallics, and electronic industries.

Artificial photosynthesis is a technology that converts carbon dioxide, a cause of global warming, into usable chemical substances with high values. In order words, this type of technology removes carbon dioxide from the environment, decreasing pollution, and converts it to obtain useful chemical substances. The electrochemical carbon dioxide conversion field, in particular, has recently been receiving much interest from the scientific community.

In the past, carbon dioxide conversion research was mainly conducted on the compound in its liquid state. When using liquid, however, the performances of different conversion systems have to be measured by immersing electrodes in water. Since carbon dioxide does not dissolve well in water, it is difficult to obtain sufficient efficiency using this process, compared to the amount of energy used. Recently, a system was developed that could convert carbon dioxide using the compound in its gaseous state. This raised the expectation that a high-efficiency conversion system would soon be achieved; however, this proved difficult due to a lack of catalysts and electrodes that could be applied to the new system.

To solve this problem, the joint KIST-TUB research team developed coral-shaped, nano-sized silver catalyst electrodes that could be applied to high-efficiency carbon dioxide conversion systems utilizing carbon dioxide in its gaseous state. Compared to other silver catalysts, the newly developed catalyst requires a low amount of energy to achieve a reaction and can produce over 100 times more carbon monoxide than liquid-based systems. The electrodes of the carbon dioxide reducing system were also successfully applied to large areas (50 cm2), showing great promise for commercialization.

The KIST-TUB researchers were also able to develop a catalyst through various **operando analysis. The team confirmed that the coral-shaped, silver nano electrode catalyst, produced using chlorine ions through a real-time, x-ray absorption analysis method, has high substance delivery capacities, thanks to its large surface area and porous structure. This means that the catalysts demonstrates high efficiency in the carbon dioxide conversion process. They further found that the carbon dioxide conversion process was less efficient when there was no hydrophobicity during the reaction; this means that a certain level of hydrophobicity must be maintained when developing carbon dioxide conversion electrodes in the future.

**Operando analysis: A technology that monitors, in real-time, the actual behavior of a catalyst or electrode structure during a reaction. X-rays, electron microscopes, and laser analysis technologies (etc.) are used in operando analysis.

*** Hydrophobicity: The physical property of not being able to easily combine with water molecules. Normally, materials without polarity demonstrate hydrophobicity.

Dr. Hyung-Suk Oh of the KIST, who jointly led the research, said, "By developing nanometer-sized, coral-shaped silver catalyst electrodes, we were able to greatly improve current density and the performance of the electrochemical carbon dioxide conversion system, thereby suggesting directions for future research." He added, "It is expected that this study will greatly contribute to the R&D of electrochemical carbon dioxide conversion systems."
-end-
The research, backed by the Ministry of Science and ICT (MSIT), was conducted as part of the Institutional Research Program of the Korea Institute of Science and Technology (KIST) and as part of the Climate Change Response Technology Development Project. The study was published in the latest issue of the international journal on energy environment, Nano Energy (IF: 15.548, JCR ranking top 3.716%).

National Research Council of Science & Technology

Related Technology Articles from Brightsurf:

December issue SLAS Technology features 'advances in technology to address COVID-19'
The December issue of SLAS Technology is a special collection featuring the cover article, ''Advances in Technology to Address COVID-19'' by editors Edward Kai-Hua Chow, Ph.D., (National University of Singapore), Pak Kin Wong, Ph.D., (The Pennsylvania State University, PA, USA) and Xianting Ding, Ph.D., (Shanghai Jiao Tong University, Shanghai, China).

October issue SLAS Technology now available
The October issue of SLAS Technology features the cover article, 'Role of Digital Microfl-uidics in Enabling Access to Laboratory Automation and Making Biology Programmable' by Varun B.

Robot technology for everyone or only for the average person?
Robot technology is being used more and more in health rehabilitation and in working life.

Novel biomarker technology for cancer diagnostics
A new way of identifying cancer biomarkers has been developed by researchers at Lund University in Sweden.

Technology innovation for neurology
TU Graz researcher Francesco Greco has developed ultra-light tattoo electrodes that are hardly noticeable on the skin and make long-term measurements of brain activity cheaper and easier.

April's SLAS Technology is now available
April's Edition of SLAS Technology Features Cover Article, 'CURATE.AI: Optimizing Personalized Medicine with Artificial Intelligence'.

Technology in higher education: learning with it instead of from it
Technology has shifted the way that professors teach students in higher education.

Post-lithium technology
Next-generation batteries will probably see the replacement of lithium ions by more abundant and environmentally benign alkali metal or multivalent ions.

Rethinking the role of technology in the classroom
Introducing tablets and laptops to the classroom has certain educational virtues, according to Annahita Ball, an assistant professor in the University at Buffalo School of Social Work, but her research suggests that tech has its limitations as well.

The science and technology of FAST
The Five hundred-meter Aperture Spherical radio Telescope (FAST), located in a radio quiet zone, with the targets (e.g., radio pulsars and neutron stars, galactic and extragalactic 21-cm HI emission).

Read More: Technology News and Technology Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.