5:00 PM - EN14.20.04
Selenium-Doped Copper Oxide Nanoarrays for Enhanced Oxygen Evolution Reaction (OER)
Lamya Tabassum1,Steven Suib1
University of Connecticut1
Show Abstract
Global energy demand is projected to increase by 50% by 2050. Existing fossil fuels can meet this energy demand only until the end of this century. Fossil fuels are also a major source of greenhouse gas emissions. Therefore, it is one of the biggest challenges to find a sustainable, clean, and efficient energy source. Ongoing research efforts have led to the invention of promising energy storage technologies like alkaline water splitting, metal-air batteries, and fuel cells.1 The oxygen evolution reaction (OER) is the critical anodic reaction in the aforementioned devices. OER is a four-electron process with sluggish reaction kinetics, thus the overall efficiency of these systems is low. RuO2 and IrO2 catalysts are considered the benchmark for OER in both acidic and alkaline media.2,3 However these noble metal-based catalysts are costly and suffer from disadvantages such as instability (oxidized to RuO4 and IrO3) under high anodic potential and dissolution into the electrolyte solution.4,5 Transition metal-based catalysts are cheap and abundant. Fe, Co, Ni, Mo, and W transition metal-based catalysts have been well explored in the past decade for OER and show promising results.6-7 However, copper oxide-based catalysts are less explored for OER due to their poor conductivity, inappropriate crystal structure, and narrow bandgap.8 Doping is an effective strategy to improve the conductivity and thus the electrocatalytic activity of the material. For example, doping sulfur into Cu2O has been reported to significantly lower the onset potential for OER.9 In this work, we have doped Se into CuO nanoarrays for OER application. We have observed that upon doping Se into CuO nanoarray structures, the overpotential for OER can be lowered significantly. Comprehensive characterization and electrochemical performance of the Se doped CuO nanoarray for OER will be presented.
References:
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(2) An, L.; Feng, J.; Zhang, Y.; Wang, R.; Liu, H.; Wang, G. C.; Cheng, F.; Xi, P. Adv. Funct. Mater. 2019, 29 (1), 1805298.
(3) Frydendal, R.; Paoli, E. A.; Knudsen, B. P.; Wickman, B.; Malacrida, P.; Stephens, I. E. L.; Chorkendorff, I. ChemElectroChem 2014, 1 (12), 2075–2081.
(4) Kötz, R.; Lewerenz, H. J.; Stucki, S. J. Electrochem. Soc. 1983, 130 (4), 825–829.
(5) Antolini, E. ACS Catalysis. American Chemical Society May 2, 2014, pp 1426–1440.
(6) Tian, T.; Huang, L.; Ai, L.; Jiang, J.. J. Mater. Chem. A 2017, 5 (39), 20985–20992.
(7) Zhou, T.; Du, Y.; Wang, D.; Yin, S.; Tu, W.; Chen, Z.; Borgna, A.; Xu, R. ACS Catal. 2017, 7 (9), 6000–6007.
(8) Kumar, B.; Saha, S.; Ojha, K.; Ganguli, A. K. Mater. Res. Bull. 2015, 64, 283–287.
(9) Zhang, X.; Cui, X.; Sun, Y.; Qi, K.; Jin, Z.; Wei, S.; Li, W.; Zhang, L.; Zheng, W. ACS Appl. Mater. Interfaces 2018, 10 (1), 745–752.
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