TY - JOUR
T1 - Facet-Dependent Temporal and Spatial Changes in Boron-Doped Diamond Film Electrodes due to Anodic Corrosion
AU - Catalan, Francesca Celine I.
AU - Hayazawa, Norihiko
AU - Yokota, Yasuyuki
AU - Wong, Raymond A.
AU - Watanabe, Takeshi
AU - Einaga, Yasuaki
AU - Kim, Yousoo
N1 - Funding Information:
This work is supported by the Japan Science and Technology Agency (JST) under the ACCEL project entitled, “Fundamentals and Applications of Diamond Electrodes.” Raman spectral mapping was done using the RAMAN-11 facility at the Synthetic Organic Chemistry Laboratory in RIKEN with the help of Dr. Keisuke Dodo. We also gratefully acknowledge Dr. Koji Sugioka, Dr. Jian Xu, and Dr. Daniela Serien of the RIKEN-SIOM Joint Research Unit for their help using the femtosecond laser micromachining facility.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/12/7
Y1 - 2017/12/7
N2 - The progression of corrosion in polycrystalline boron-doped diamond (BDD) thin film electrode is explored as the electrode undergoes high-current density anodic treatments with organic compounds. Micro-Raman spectroscopy and spectral mapping indicate that anodic corrosion is initiated by the conversion of sp3 diamond to amorphous sp2 carbon at the surface, which are then removed after longer anodic treatment. Polarized Raman analysis reveals that corrosion-induced changes on the surface are specific to (100)-grain facets and (111)-grain edges. X-ray photoelectron spectroscopic measurements suggest that carbonyl groups consequently form on these specific sites and act as an intermediate toward the etching of the surface. This process exposes and subsequently removes the subsurface boron atoms, thus reducing the doping density. The observed crystal grain orientation dependence of the corrosion process provides new insights toward a better understanding of degradation in BDD electrodes.
AB - The progression of corrosion in polycrystalline boron-doped diamond (BDD) thin film electrode is explored as the electrode undergoes high-current density anodic treatments with organic compounds. Micro-Raman spectroscopy and spectral mapping indicate that anodic corrosion is initiated by the conversion of sp3 diamond to amorphous sp2 carbon at the surface, which are then removed after longer anodic treatment. Polarized Raman analysis reveals that corrosion-induced changes on the surface are specific to (100)-grain facets and (111)-grain edges. X-ray photoelectron spectroscopic measurements suggest that carbonyl groups consequently form on these specific sites and act as an intermediate toward the etching of the surface. This process exposes and subsequently removes the subsurface boron atoms, thus reducing the doping density. The observed crystal grain orientation dependence of the corrosion process provides new insights toward a better understanding of degradation in BDD electrodes.
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U2 - 10.1021/acs.jpcc.7b06085
DO - 10.1021/acs.jpcc.7b06085
M3 - Article
AN - SCOPUS:85038208424
SN - 1932-7447
VL - 121
SP - 26742
EP - 26750
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 48
ER -