Faulty reasoning signals

• Confirmation Bias - 6.4% (32 hits)
• Anchoring Bias - 6.6% (33 hits)
• Availability Heuristic - 3.2% (16 hits)
• Representativeness Heuristic - 0%
• Hindsight Bias - 0%
• Overconfidence Bias - 23.1% (115 hits)
• Framing Effect - 10.1% (50 hits)
• Loss Aversion - 0%
• Status Quo Bias - 0%
• Sunk Cost Effect - 0%
• Optimism Bias - 11.1% (55 hits)
• Pessimism Bias - 0%

Article text

Japanese catalyst keeps CO₂-to-methanol byproducts below 11 percent

Scientists in Japan have recently developed a copper nanocluster that can convert carbon dioxide (CO2) into methanol while greatly reducing unwanted byproducts.

The project was carried out by scientists from Tohoku University in Japan and the Indian Institute of Technology Indore.

The new approach transforms harmful CO2 into valuable fuels and chemicals under mild conditions.

The team unveiled that controlling copper atoms changes how CO2 is converted in an electrochemical reaction.

Instead of producing large amounts of formate, an unwanted byproduct, the newly designed catalyst selectively generates methanol.

According to the team, the discovery is essential for designing advanced catalysts.

It shows how atomic-level control can unlock cleaner and more efficient pathways for converting CO2 into valuable fuels.

Cleaner fuel production

Copper (Cu) has long attracted attention as an inexpensive and abundant catalyst for converting carbon dioxide.

It is, in fact, the only monometallic catalyst that can be used in electrochemical CO2 reduction processes for high-value chemicals and fuels.

However, existing copper catalysts often produce formate alongside the desired products.

Formate is the salt or ion of formic acid and is widely used in industries such as agriculture and manufacturing.

Still, during methanol production, it is an unwanted byproduct because it diverts carbon away from methanol formation.

To tackle the challenge, the team created a sulfide-templated copper nanocluster (S@Cu50S12(StBu)20(CF3COO)12) with a precisely controlled internal structure.

It featured a unique core-shell architecture composed of an inner S@Cu14S12 core surrounded by an outer Cu36(StBu)20 shell protected by thiolate ligands.

It enabled the team to tune the ratio of Cu(I) and Cu(II) oxidation states without changing the catalyst’s overall geometry.

They then compared the catalyst with a previously reported copper nanocluster to determine how the subtle electronic changes affect carbon dioxide conversion.

Although both catalysts showed similar overall activity, their products were very different.

A better copper catalyst

The conventional catalyst produced formate with a Faradaic efficiency of about 38 percent.

In contrast, the new nanocluster reduced formate formation to below 11 percent and produced methanol with a Faradaic efficiency of about 19 percent at -1.0 volts (V) versus the reversible hydrogen electrode (RHE).

The older catalyst produced no methanol at all.

“This work establishes that subtle modulation of the Cu(I)/Cu(II) balance can fundamentally redirect reaction pathways, providing a molecular-level strategy to overcome intrinsic selectivity limitations in Cu NC catalysis,” the team pointed out.

According to the researchers, adding a sulfide ion at the center of the nanocluster subtly changed its electronic structure.

It affected how the reaction intermediates interacted with the catalyst surface.

They believe their findings will provide a new strategy for designing catalysts with atomic-level precision.

“This study provides the first clear evidence that precise modulation of the copper valence state in Cu nanoclusters can directly influence the selectivity of CO2 reduction pathways,” Yuichi Negishi, PhD, an associate professor at Tohoku University, concluded in a press release.

The study has been published in the open access journal JACS Au.