Electrocatalytic Production of Hydrogen Gas by a Cobalt Formamidinate Complex

Authors

  • Yanyu Wu The University of Texas at El Paso
  • Luis Manuel Aguirre Quintana The University of Texas at El Paso
  • Karen Ventura The University of Texas at El Paso
  • Isabel Barraza Alvarez The University of Texas at El Paso
  • Alejandro Metta The University of Texas at El Paso
  • Dino Villagran The University of Texas at El Paso

DOI:

https://doi.org/10.29356/jmcs.v63i3.535

Keywords:

cobalt, formamidinate, electrocatalytic, hydrogen gas

Abstract

ABSTRACT. A molecular cobalt complex, Co(DippF)2 (where DippF is the anion of N,N’-bis[2,6-diisopropylphenyl]-formamidine), (1),is able to electrochemically produce hydrogen gas from the reduction of organic acids in homogeneous solutions. Compound 1 has a distorted square planar structure as evidenced through X-ray crystallography studies, and an effective magnetic moment of 4.13, obtained by the Evans method, that corresponds to three unpaired electrons. Compound 1 shows an irreversible cathodic peak at –1.59 V vs Fc/Fc+ which is assigned to the reduction of CoII to CoI. In the presence of organic acids the onset of catalytic current is observed at  –1.2 V, –1.45 V and –1.89 V vs. Fc/Fc+ with p-toluenesulfonic acid, benzoic acid and phenol as the proton source, respectively, in MeCN as the solvent. Detection of hydrogen gas was obtained by GC-MS with Faradaic efficiencies ranging from 85% to 100%. Kinetic studies using foot-of-the-wave analysis (FOWA) reveal a linear dependence of the observed rate constant, kobs, against acid concentration in the range of 0.065 to 10.02 s-1.

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Published

2019-10-17

Issue

Vol. 63 No. 3 (2019): Special Issue: Mexican Chemist Overseas

Section

Regular Articles

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