Undoped and Ni-doped CoOx surface modification of porous BiVO4 photoelectrodes for water oxidation

Liu, Ya; Guo, Youhong; Schelhas, Laura T.; Li, Mingtao; Ager, Joel W.

doi:10.1021/acs.jpcc.6b08654

Title: Undoped and Ni-doped CoO_x surface modification of porous BiVO₄ photoelectrodes for water oxidation

Journal Article · Thu Sep 29 00:00:00 EDT 2016 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.6b08654· OSTI ID:1350543

Liu, Ya ^[1]; Guo, Youhong ^[2]; Schelhas, Laura T. ^[3]; Li, Mingtao ^[4]; Ager, Joel W. ^[5]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Xi'an Jiaotong Univ., Shaanxi (China)
Univ. of California, San Diego, La Jolla, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Xi'an Jiaotong Univ., Shaanxi (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

© 2016 American Chemical Society. Surface modification of photoanodes with oxygen evolution reaction (OER) catalysts is an effective approach to enhance water oxidation kinetics, to reduce external bias, and to improve the energy harvesting efficiency of photoelectrochemical (PEC) water oxidation. Here, the surface of porous BiVO 4 photoanodes was modified by the deposition of undoped and Ni-doped CoO x via nitrogen flow assisted electrostatic spray pyrolysis. This newly developed atmospheric pressure deposition technique allows for surface coverage throughout the porous structure with thickness and composition control. PEC testing of modified BiVO 4 photoanodes shows that after deposition of an undoped CoO x surface layer, the onset potential shifts negatively by ca. 420 mV and the photocurrent density reaches 2.01 mA cm -2 at 1.23 vs V RHE under AM 1.5G illumination. Modification with Ni-doped CoO x produces even more effective OER catalysis and yields a photocurrent density of 2.62 mA cm -2 at 1.23 V RHE under AM 1.5G illumination. The valence band X-ray photoelectron spectroscopy and synchrotron-based X-ray absorption spectroscopy results show the Ni doping reduces the Fermi level of the CoO x layer; the increased surface band bending produced by this effect is partially responsible for the superior PEC performance.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515; SC0004993; 51302211; AC02-05CH11231

OSTI ID:: 1350543

Alternate ID(s):: OSTI ID: 1379585

Journal Information:: Journal of Physical Chemistry. C, Vol. 120, Issue 41; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 52 works

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Title: Undoped and Ni-doped CoO_x surface modification of porous BiVO₄ photoelectrodes for water oxidation