(544ej) One Dimensional (1D) Earth-Abundant Based Nanomaterials As Oxygen Evolution Reaction Electrocatalysts for Acid Mediated Proton Exchange Membrane Based Water Electrolysis
Generating one-dimensional (1D) architecture is a promising strategy for achieving improved electrocatalytic response. Over the past few years, electro-catalysts with 1D nanostructured morphologies such as nanowires (NWs), nanorods (NRs) as well as nanotubes (NTs) have garnered significant attention as a potentially effective materials for water splitting due to their inherent benefits such as high electro-catalytic surface area, high aspect ratios (length-to-width ratio) and facile electron transport though 1D nanotubular arrays 4-9. Therefore, in the present study, based on the theoretical first principles calculations of the total energies and electronic structures conducted in our group, we have explored 1D structured-morphology for the F substituted and earth abundant transition metal oxide (SnO2) based electrocatalyst system. The as-synthesized electrocatalyst system exhibits remarkably higher electrocatalytic activity and excellent stability for acidic OER.
Electrochemical characterization of these electro-catalysts has been carried out in three-electrode configuration system, using 1N H2SO4 electrolyte solution. Pt wire and Hg/Hg2SO4 are used as a counter electrode and reference electrode (+0.65 V with respect to normal hydrogen electrode, NHE) respectively. The electrochemical characterization has been performed with a scan rate of 10 mV/sec and at temperature of 40oC. The as-synthesized 1D electrocatalyst exhibited significantly lower charge transfer resistance (Rct) than the benchmark noble metal based OER catalysts and many other precious/non-precious electrocatalysts systems. In addition, the as-synthesized 1D electrocatalyst displayed remarkable activity yielding a current density of ~ 10 mA/cm2 at an overpotential of ~ 285 mV (1.51V). Further, the chronoamperometry test conducted in 1N H2SO4 solution shows the minimal loss in current density, indicating a good electrochemical stability of the as-prepared electro-catalysts.
In conclusion, we have developed highly active 1D OER electrocatalyst system for the PEM water splitting. The enhanced electrocatalytic activity of this electro-catalyst is majorly attributed to modification of the electronic structure (as evidenced from theoretical study) and lower charge transfer resistance (i.e. lower activation polarization owing to 1D architecture). Thus, we believe that the present electrocatalyst system is promising and reliable for cost-effective and sustainable hydrogen production. The results of this work will be presented and discussed.
Financial support of NSF-CBET grant# 1511390, Edward R. Weidlein Chair Professorship funds and the Center for Complex Engineered Multifunctional Materials (CCEMM) is acknowledged.
(1) Ghadge, S. D.; Patel, P. P.; Datta, M. K.; Velikokhatnyi, O. I.; Kuruba, R.; Shanthi, P. M.; Kumta, P. N. Fluorine substituted (Mn,Ir)O2:F high performance solid solution oxygen evolution reaction electro-catalysts for PEM water electrolysis. RSC Advances 2017, 7 (28), 17311-17324, DOI: 10.1039/C6RA27354H.
(2) Patel, P. P.; Velikokhatnyi, O. I.; Ghadge, S. D.; Hanumantha, P. J.; Datta, M. K.; Kuruba, R.; Gattu, B.; Shanthi, P. M.; Kumta, P. N. Electrochemically active and robust cobalt doped copper phosphosulfide electro-catalysts for hydrogen evolution reaction in electrolytic and photoelectrochemical water splitting. International Journal of Hydrogen Energy 2018.
(3) Ghadge, S.; Chavan, M.; Divekar, A.; Vibhandik, A.; Pawar, S.; Marathe, K. Mathematical Modelling for Removal of Mixture of Heavy Metal Ions from Waste-Water Using Micellar Enhanced Ultrafiltration (MEUF) Process. Separation Science and Technology 2015, 50 (3), 365-372, DOI: 10.1080/01496395.2014.973515.
(4) Ghadge, S. D.; Patel, P. P.; Velikokhatnyi, O. I.; Datta, M. K.; Jampani, P.; Kumta, P. N. In Highly Efficient Fluorine (F) Doped Transition Metal Non-Oxide Pnictide (TMN) Based Electro-Catalyst for Oxygen Evolution Reaction in Alkaline Water Electrolysis, The Electrochemical Society: National Harbor, 2017; pp 1004-1004.
(5) Ghadge, S. D.; Patel, P. P.; Velikokhatnyi, O. I.; Datta, M. K.; Kumta, P. N. In Ultra-Low Platinum Group Metal (PGM) Containing (Mn1-XIrx) O2: 10F-Highly Active and Durable Oxygen Evolution Electrocatalyst for PEM Water Electrolysis, The Electrochemical Society: Washington Seattle 2018; pp 1640-1640.
(6) Ghadge, S. D.; Patel, P. P.; Datta, M. K.; Velikokhatnyi, O. I.; Kumta, P. N. In One Dimensional (1D) Nanotubular F Doped Transition Metal Oxide Arrayed Architectures-Robust Oxygen Evolution Electrocatalyst for PEM Water Electrolysis, The Electrochemical Society: New Orleans, 2017; pp 1385-1385.
(7) Patel, P. P.; Velikokhatnyi, O. I.; Ghadge, S. D.; Jampani, P. H.; Datta, M. K.; Hong, D.; Poston, J. A.; Manivannan, A.; Kumta, P. N. Highly active robust oxide solid solution electro-catalysts for oxygen reduction reaction for proton exchange membrane fuel cell and direct methanol fuel cell cathodes. International Journal of Hydrogen Energy 2017, 42 (38), 24079-24089.
(8) Li, J.; Zheng, G. OneâDimensional EarthâAbundant Nanomaterials for WaterâSplitting Electrocatalysts. Advanced Science 2017, 4 (3).
(9) Kim, Y.; Kim, J. G.; Noh, Y.; Kim, W. B. An Overview of One-Dimensional Metal Nanostructures for Electrocatalysis. Catalysis Surveys from Asia 2015, 19 (2), 88-121.