Journal article
Coupled effects of temperature and mass transport on the isotope fractionation of zinc during electroplating
JR Black, SG John, A Kavner
Geochimica Et Cosmochimica Acta | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2014
Abstract
The isotopic composition of zinc metal electrodeposited on a rotating disc electrode from a Zn-citrate aqueous solution was investigated as a function of overpotential (electrochemical driving force), temperature, and rotation rate. Zn metal was measured to be isotopically light with respect to Zn+2 in solution, with observed fractionations varying from δ66/64Znmetal-aqueous=-1.0‰ to -3.9‰. Fractionation varies continuously as a function of a dimensionless parameter described by the ratio of observed deposition rate to calculated mass-transport limiting rate, where larger fractionations are observed at lower deposition rates, lower temperature, and at faster electrode rotation rates. Thus, t..
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Awarded by U.S. Department of Energy
Funding Acknowledgements
We thank Professor Edwin Schauble for his input and discussion of equilibrium isotope effects and Professor Jess Adkins for access to facilities at Caltech. We thank Jeffrey Crawford for assistance with the Zn electroplating experiments. This work was funded by the US Department of Energy: Division of Chemical Sciences, Geosciences, & Biosciences DE-FG02-10ER16136 (A.K.).