Boosting photocatalytic overall water splitting by Co doping into Mn3O4 nanoparticles as oxygen evolution cocatalysts

Taizo Yoshinaga; Masaki Saruyama; Anke Xiong; Yeilin Ham; Yongbo Kuang; Ryo Niishiro; Seiji Akiyama; Masanori Sakamoto; Takashi Hisatomi; Kazunari Domen; Toshiharu Teranishi

doi:10.1039/C8NR00377G

Boosting photocatalytic overall water splitting by Co doping into Mn₃O₄ nanoparticles as oxygen evolution cocatalysts†

Taizo Yoshinaga,^a Masaki Saruyama,

*^b Anke Xiong,^c Yeilin Ham,^c Yongbo Kuang,^c Ryo Niishiro,^de Seiji Akiyama,^ef Masanori Sakamoto,

*^b Takashi Hisatomi,

^c Kazunari Domen

^c and Toshiharu Teranishi

*^b

Author affiliations

* Corresponding authors

^a Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan

^b Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
E-mail: saruyama@scl.kyoto-u.ac.jp, sakamoto@scl.kyoto-u.ac.jp, teranisi@scl.kyoto-u.ac.jp

^c Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

^d Mitsui Chemicals, Inc., 580-32 Nagaura, Sodegaura 299-0265, Japan

^e Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), 5-1-5 Kashiwanoha, Kashiwa 277-6589, Japan

^f Mitsubishi Chemical Group Science and Technology Research Center, Inc., 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan

Abstract

The effect of cobalt doping into a manganese oxide (tetragonal spinel Mn₃O₄) nanoparticle cocatalyst up to Co/(Co + Mn) = 0.4 (mol/mol) on the activity of photocatalytic water oxidation was studied. Monodisperse ∼10 nm Co_yMn_1−yO (0 ≤ y ≤ 0.4) nanoparticles were uniformly loaded onto photocatalysts and converted to Co_xMn_3−xO₄ nanoparticles through calcination. 40 mol% cobalt-doped Mn₃O₄ nanoparticle-loaded Rh@Cr₂O₃/SrTiO₃ photocatalyst exhibited 1.8 times-higher overall water splitting activity than that with pure Mn₃O₄ nanoparticles. Investigation on the band structure and electrocatalytic water oxidation activity of Co_xMn_3−xO₄ nanoparticles revealed that the Co doping mainly contributes to the improvement of water oxidation kinetics on the surface of the cocatalyst nanoparticles.

Nanoscale

Boosting photocatalytic overall water splitting by Co doping into Mn₃O₄ nanoparticles as oxygen evolution cocatalysts†

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Boosting photocatalytic overall water splitting by Co doping into Mn₃O₄ nanoparticles as oxygen evolution cocatalysts

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