University of Science and Technology of China
Design of the ultrathin 2D electrocatalysts for promoting CO2 reduction
Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
This talk firstly reviews our group’s recent advances in the controllable synthesis, fine structure and defect characterization, and electronic structure modulation of ultrathin 2D semiconductors. The optimized electronic/phonon structures with efforts to achieve enhanced photocatalytic and thermoelectric efficiencies, finally enabled these ultrathin semiconductors promising opportunities for harvesting solar energy to generate chemical energy or for converting waste heat into electricity. For instance, to achieve promoted CO2 electroreduction performances, we proposed that ultrathin 2D electrocatalysts can offer ultralarge fraction of active sites, high electric conductivity and superior structural stability, which holds great promise for designing efficient and robust catalysts for CO2 electroreduction. Specifically, we construct an ideal model of metal atomic layer with its native oxide to evaluate CO2 reduction in two well-defined catalytic sites. The result show both the atomic-scale structure and the presence of oxide help to change the underlying paths of CO2 electroreduction which enable the partially oxidized cobalt atomic layers with much improved activity and selectivity. These findings point to novel opportunities for manipulating and improving the CO2 electroreduction properties with 2D ultrathin materials with different surface modification, as well as throwing lights into the fundamental understanding of CO2 activation mechanism.
Bio: Prof. XIE Yi received her BS in Xiamen University (1988) and Ph.D in University of Science and Technology of China (USTC, 1996). In May 1996, she joined the faculty at the Department of Chemistry, USTC. She is now a Principal Investigator (PI) of Department of Nanomaterials and Nanochemistry, Hefei National Laboratory for Physical Sciences at Microscale and a full professor of Department of Chemistry, USTC. She is also a recipient of many awards, including L'Oréal-UNESCO for Women in Science Awards (2015), TWAS Prize for Chemistry (2014), IUPAC Distinguished Women in Chemistry/Chemical Engineering (2013), China Young Scientist Award (2002), China Young Female Scientist Award (2006), Chinese Academy of Sciences-Bayer Young Scientist Award (2003), the Cheung Kong Scholar, Ministry of Education (2000). She was elected as member of Chinese Academy of Sciences in 2013, TWAS member in 2015, as well as Academician of Asia-Pacific Academy of Materials (APAM) in 2015. She is now serving as one of the associate editors of Inorganic Chemistry Frontiers, International/ Editorial Board members of 4 international journals including J. Am. Chem. Soc., Angew. Chem. Int. Ed., ACS Central Science, Materials Horizons, and 2 Chinese journals including Chinese Journal of Inorganic Chemistry. Her research interests focus on the design and synthesis of inorganic functional solids with efforts to modulate their electronic and phonon structures.