Abstract
In situ O K-edge X-ray absorption fine structure (XAFS) spectroscopy was applied to investigate the electronic and structural change in the nickel-borate (Ni-B<inf>i</inf>) electrocatalyst during the oxygen evolution reaction (OER). An absorption peak was observed around 528.7 eV at 1.0 V versus Ag/AgCl in a potassium borate aqueous solution, which relates with the formation of nanoscale order domains of edge-sharing NiO<inf>6</inf> octahedra in the Ni-B<inf>i</inf> electrocatalyst. XAFS spectra were measured with variation of the electrode potential from 0.3 up to 1.0 V. The measured absorption peaks suggest that the quantity of NiO<inf>6</inf> octahedra increased in correlation with the OER current; however, when the potential was changed downward, the XAFS absorption peak assigned to NiO<inf>6</inf> octahedra remained constant, even at the electrode potential for no OER current. This difference implies that the water oxidation catalysis proceeds at the domain edge of NiO<inf>6</inf> octahedra. The XAFS technique provides the first successful direct probing of the active species in the Ni-B<inf>i</inf> electrocatalyst during electrochemical reaction.
| Original language | English |
|---|---|
| Pages (from-to) | 19279-19286 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry C |
| Volume | 119 |
| Issue number | 33 |
| DOIs | |
| Publication status | Published - 2015 Aug 20 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Energy(all)
Cite this
Direct Observation of Active Nickel Oxide Cluster in Nickel-Borate Electrocatalyst for Water Oxidation by in Situ O K-Edge X-ray Absorption Spectroscopy. / Yoshida, Masaaki; Mitsutomi, Yosuke; Mineo, Takehiro; Nagasaka, Masanari; Yuzawa, Hayato; Kosugi, Nobuhiro; Kondoh, Hiroshi.
In: Journal of Physical Chemistry C, Vol. 119, No. 33, 20.08.2015, p. 19279-19286.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Direct Observation of Active Nickel Oxide Cluster in Nickel-Borate Electrocatalyst for Water Oxidation by in Situ O K-Edge X-ray Absorption Spectroscopy
AU - Yoshida, Masaaki
AU - Mitsutomi, Yosuke
AU - Mineo, Takehiro
AU - Nagasaka, Masanari
AU - Yuzawa, Hayato
AU - Kosugi, Nobuhiro
AU - Kondoh, Hiroshi
PY - 2015/8/20
Y1 - 2015/8/20
N2 - In situ O K-edge X-ray absorption fine structure (XAFS) spectroscopy was applied to investigate the electronic and structural change in the nickel-borate (Ni-Bi) electrocatalyst during the oxygen evolution reaction (OER). An absorption peak was observed around 528.7 eV at 1.0 V versus Ag/AgCl in a potassium borate aqueous solution, which relates with the formation of nanoscale order domains of edge-sharing NiO6 octahedra in the Ni-Bi electrocatalyst. XAFS spectra were measured with variation of the electrode potential from 0.3 up to 1.0 V. The measured absorption peaks suggest that the quantity of NiO6 octahedra increased in correlation with the OER current; however, when the potential was changed downward, the XAFS absorption peak assigned to NiO6 octahedra remained constant, even at the electrode potential for no OER current. This difference implies that the water oxidation catalysis proceeds at the domain edge of NiO6 octahedra. The XAFS technique provides the first successful direct probing of the active species in the Ni-Bi electrocatalyst during electrochemical reaction.
AB - In situ O K-edge X-ray absorption fine structure (XAFS) spectroscopy was applied to investigate the electronic and structural change in the nickel-borate (Ni-Bi) electrocatalyst during the oxygen evolution reaction (OER). An absorption peak was observed around 528.7 eV at 1.0 V versus Ag/AgCl in a potassium borate aqueous solution, which relates with the formation of nanoscale order domains of edge-sharing NiO6 octahedra in the Ni-Bi electrocatalyst. XAFS spectra were measured with variation of the electrode potential from 0.3 up to 1.0 V. The measured absorption peaks suggest that the quantity of NiO6 octahedra increased in correlation with the OER current; however, when the potential was changed downward, the XAFS absorption peak assigned to NiO6 octahedra remained constant, even at the electrode potential for no OER current. This difference implies that the water oxidation catalysis proceeds at the domain edge of NiO6 octahedra. The XAFS technique provides the first successful direct probing of the active species in the Ni-Bi electrocatalyst during electrochemical reaction.
UR - http://www.scopus.com/inward/record.url?scp=84939808399&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84939808399&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.5b06102
DO - 10.1021/acs.jpcc.5b06102
M3 - Article
AN - SCOPUS:84939808399
VL - 119
SP - 19279
EP - 19286
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 33
ER -