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Inexpensive Electrocatalysts for Nonconventional Water Splitting and Beyond

Date: 
Monday, November 26, 2018 - 16:00 to 17:00
Speaker: 
Prof. Yujie Sun
Affiliation: 
University of Cincinnati
Event Category: 
External Examiner Seminar
Location: 
Chemistry D200

Abstract

One of the challenges to realize large-scale H2 production from water electrolysis is the lack of competent and inexpensive electrocatalysts. Our group recently discovered that interfacial sites between nickel and nickel nitride can act as superior bifunctional electrocatalysts for both H2 evolution and oxidation under neutral and alkaline conditions, rivaling the performance of the state-of-the-art platinum-based catalysts. In addition, since water oxidation is more kinetically challenging while its product O2 is not of significant value, we are also interested in exploring alternative oxidation reactions which can not only provide electrons for H2 evolution at the cathode but also yield value-added organic products at the anode. Within this context, biomass-derived intermediate compounds are found to be suitable candidates for electrocatalytic upgrading, which can be integrated with H2 production under alkaline conditions. Finally, a new electrolyzer design for decoupled water splitting and organic transformation will be presented, which is able to substantially reduce voltage inputs and mitigate the H2/O2 mixing issue commonly encountered in conventional water electrolysis.

 

References

1. Jiang, N.; You, B.; Sheng, M.; Sun, Y.* Angew. Chem. Int. Ed.  201554, 6251.

2. You, B.; Jiang, N.; Liu, X.; Sun, Y.* Angew. Chem. Int. Ed. 201655, 9913.

3. You, B.; Liu, X.; Jiang, N.; Sun, Y.* J. Am. Chem. Soc. 2016138, 13639.

4. You, B.; Liu, X.; Hu, G.; Gul, S.; Yano, J.; Jiang, D. E.; Sun, Y.* J. Am. Chem. Soc. 2017, 139, 12283.

5. Han, G.; Jin, Y. -H.; Burgess, R. A.; Dickenson, N. E.; Cao, X. -M.; Sun, Y.* J. Am. Chem. Soc. 2017, 139, 15584.

6. You, B.; Sun, Y.* Acc. Chem. Res. 2018, 51, 1571.

7. Song, F.; Li, W.; Yang, J.; Han, G.; Liao, P.; Sun, Y.* Nature Commun. 2018, 9, 4531.

Biosketch

Yujie Sun received a B.S. degree in Chemistry from Fudan University in 2005. He then pursued graduate studies in inorganic photochemistry with Prof. Claudia Turro at The Ohio State University and obtained his Ph.D. degree in 2010. Subsequently, he joined the group of Prof. Christopher J. Chang at the University of California, Berkeley and Lawrence Berkeley National Laboratory as a postdoctoral scholar, working on renewable energy catalysis. Yujie started his independent career as an assistant professor at Utah State University in 2013 and moved to the University of Cincinnati as an associate professor in 2018. His group is interested in developing and understanding inexpensive materials and complexes for energy catalysis and biomedical applications.