Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 11, Pages 5680-5685Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1918837117
Keywords
hierarchical nanostructures; gold nanostructures; mass transport; proximity-field nanopatterning; carbon dioxide reduction
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Funding
- National Research Foundation of Korea - Ministry of Science, Information and Communications Technology (ICT) and Future Planning (MSIP) [2017M3D1A1039558, 2017M3D1A1040692, 2017M3A7B4049507, 2016R1E1A1A01943131]
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Electrocatalytic CO2 reduction is a promising way to provide renewable energy from gaseous CO2. The development of nanostructures improves energy efficiency and selectivity for value-added chemicals, but complex nanostructures limit the CO2 conversion rates due to poor mass transport during vigorous electrolysis. Herein, we propose a three-dimensional (3D) hierarchically porous Au comprising interconnected macroporous channels (200-300 nm) and nanopores (similar to 10 nm) fabricated via proximity-field nanopatterning. The interconnected macropores and nanopores enable efficient mass transport and large active areas, respectively. The roles of each pore network are investigated using reliable 3D nanostructures possessing controlled pore distribution and size. The hierarchical nanostructured electrodes show a high CO selectivity of 85.8% at a low overpotential of 0.264 V and efficient mass activity that is maximum 3.96 times higher than that of dealloyed nanoporous Au. Hence, the systematic model study shows the proposed hierarchical nanostructures have important value in increasing the efficiency of expensive Au.
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