Affiliation:
1. Toyota Central Research and Development Laboratories, Incorporated, Nagakute, Aichi 480-1192, Japan.
Abstract
Electrocatalytic CO
2
reduction is a key aspect of artificial photosynthesis systems designed to produce fuels. Although some molecular catalysts have good performance for CO
2
reduction, these compounds also suffer from poor durability and energy efficiency. The present work demonstrates the improved CO
2
reduction activity exhibited by molecular catalysts in a flow cell. These catalysts were composed of a cobalt-tetrapyridino-porphyrazine complex supported on carbon black together with potassium salt and were both stable and efficient. These systems were found to promote electrocatalytic CO
2
reduction with a current density of 100 mA/cm
2
and generated CO over at least 1 week with a selectivity of approximately 95%. The optimal catalyst gave a turnover number of 3,800,000 and an energy conversion efficiency of more than 62% even at 200 mA/cm
2
.
Publisher
American Association for the Advancement of Science (AAAS)