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

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [4];  [5]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Xi'an Jiaotong Univ., Shaanxi (China)
  2. Univ. of California, San Diego, La Jolla, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Xi'an Jiaotong Univ., Shaanxi (China)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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 BiVO4 photoanodes was modified by the deposition of undoped and Ni-doped CoOx 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 BiVO4 photoanodes shows that after deposition of an undoped CoOx 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 VRHE under AM 1.5G illumination. Modification with Ni-doped CoOx produces even more effective OER catalysis and yields a photocurrent density of 2.62 mA cm–2 at 1.23 VRHE under AM 1.5G illumination. Furthermore, 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 CoOx layer; the increased surface band bending produced by this effect is partially responsible for the superior PEC performance.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-76SF00515; SC0004993
OSTI ID:
1350543
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 41 Vol. 120; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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