Kinetics of hydrogen evolution reaction in alkaline electrolysis on a Ni cathode in the presence of Ni
By Vladimir M. Nikolic and Sladjana Lj. Maslovara and Gvozden S. Tasic and Tanja P. Brdaric and Petar Z. Lausevic and Bojan B. Radak and Milica P. Marceta Kaninski
Published in Applied Catalysis B: Environmental
NULL
2015
Abstract
This paper presents investigations on the influence of in-situ ionic activation using combination of three d-metals: Ni, Co and Mo on the hydrogen evolution reaction (HER) mechanism and kinetics. Polarization measurements were performed to obtain kinetic parameters for the \HER\ and the results are presented to show Tafel slopes, exchange current densities and apparent energy of activation. The values of the kinetic parameters confirm the existence of two Tafel slopes, in the case of NiCoMo based ionic activators (i.a.) in the investigated temperature range, with very high values of the exchange current density. Electrochemical impedance spectroscopy measurements were employed to further investigate the origin of the obtained electrocatalytic effect on the HER. The measurements were performed at several overpotentials and temperatures. It was found that co-deposition of Ni, Co and Mo species on the Ni cathode results in a large number of active sites for hydrogen adsorption, and a synergetic effect giving electronic structure suitable for the HER, are the main factors contributing to the enhanced \HER\ kinetics. It was shown that \EIS\ measurements had a crucial role in determining the \HER\ mechanism, especially with the complex in-situ activation of the alkaline electrolysis.
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.