Highly Selective Pressure-Driven Electrochemical Conversion of CO2 into CO over Nickel-Encapsulated Nitrogen-Doped Carbon Nanotubes
Source abstract
Abstract
The selective electroreduction of CO 2 to CO is an attractive avenue for storing intermittent renewable energy. Although designing a precise confining microenvironment for active sites is challenging, most CO 2 -to-CO catalysts are developed by considering the potential of structural reconstruction. Herein, we report encapsulating Ni within nitrogen-doped carbon nanotubes (NCNTs) as an effective strategy for improving CO 2 adsorption and catalytic activity. The Ni/NCNT catalyst exhibited a faradaic efficiency exceeding 99.4% for the conversion of CO 2 into CO, with a current density of −27.73 mA cm –2 at −3.0 V under high-pressure conditions (8.0 MPa). The high CO selectivity (>99.2%) and low potential (−3.0 V) were maintained during long-term operation (12 h) at 6.0 MPa. Two strategies were used to produce CO in a highly selective manner: the first involved designing Ni/NCNTs that maintain good CO selectivity, while the second involved developing a high-pressure CO 2 RR system that delivers a superior local CO 2 concentration and suppresses the competing hydrogen-evolution reaction. The synergy between these two strategies led to the production of CO via stable and efficient CO 2 reduction. The Ni/NCNT catalyst promotes the linear adsorption of CO while suppressing the bridged-adsorption mode on the catalyst surface.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: CO2 Reduction Techniques and Catalysts · Ionic liquids properties and applications · Advanced Thermoelectric Materials and Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-Ro, Jangan-Gu, Suwon, Gyeonggi-Do 16419, Republic of Korea
Department of Energy Engineering, KENTECH Institute for Environmental and Climate Technology
Korea Institute of Energy Technology (KENTECH)
School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-Ro, Jangan-Gu, Suwon, Gyeonggi-Do 16419, Republic of Korea
Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarang-Ro 14-gil 5, Seongbuk-Gu, Seoul 02792, Republic of Korea
School of Advanced Materials Science & Engineering
Sungkyunkwan University (SKKU)
KIST-SKKU Carbon-Neutral Research Center
Sungkyunkwan Advanced Institute of Nano Technology, Sungkyunkwan University, 2066, Seobu-Ro, Jangan-Gu, Suwon, Gyeonggi-Do 16419, Republic of Korea
Department of Low-Carbon Energy Engineering, Sungkyunkwan University, 2066, Seobu-Ro, Jangan-Gu, Suwon, Gyeonggi-Do 16419, Republic of Korea
Funding
National Research Council of Science and Technology · National Research Foundation of Korea · Korea Institute of Energy Technology Evaluation and Planning
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