Modification of Wide‐Band‐Gap Oxide Semiconductors with Cobalt Hydroxide Nanoclusters for Visible‐Light Water Oxidation

Maeda, Kazuhiko; Ishimaki, Koki; Tokunaga, Yuki; Lu, Daling; Eguchi, Miharu

doi:10.1002/anie.201602764

Cited by 80 publications

(44 citation statements)

References 51 publications

(104 reference statements)

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“…Various kinds of strategies have been proposed to improve separation and transfer efficiency of the photogenerated charges, among which fabrication of phase junctions is an effective approach. [9][10][11][12] The phase junctions in polymorph semiconductors, such as the anatase/rutile phase junction in TiO 2 [2,[13][14][15][16][17][18][19][20] and α/β phase junction in Ga 2 O 3 [21][22][23][24][25] have been widely investigated. This kind of phase junction constructed by the different phases of the same semiconductor has attracted much attention due to its simplicity, controllability and great photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of vertical orthorhombic/hexagonal tungsten oxide phase junction with high photocatalytic performance

Tang

Zhang

et al. 2017

Applied Catalysis B: Environmental

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The common one dimensional (1D) core-shell phase junction usually cannot fully utilize the separated charges because one phase is encapsulated inside, which leads to the incomplete release of the electrons or holes. Here, a unique vertical 1D/1D tungsten oxide phase junction constructed by orthorhombic WO 3 •0.33H 2 O (o-WO 3 •0.33H 2 O) nanorods and hexagonal WO 3 (h-WO 3) nanowires in the sunflower-like structure was fabricated via a facile one-step hydrothermal method. The nanorods and the nanowires vertically intersect at the endpoint to construct the vertical 1D/1D phase junction with another end exposed outside. This structure ensures that both two phases can contact the pollutants, so as to fully release the holes and electrons that accumulate on the o-WO 3 •0.33H 2 O and h-WO 3 phase, respectively. Furthermore, the two phases are both single crystals, substantially decreasing the impediments of defects to the transport of the photogenerated charges. This novel

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Section: Introductionmentioning

confidence: 99%

Fabrication of vertical orthorhombic/hexagonal tungsten oxide phase junction with high photocatalytic performance

Tang

Zhang

et al. 2017

Applied Catalysis B: Environmental

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“…Recently, the first‐row transition‐metal‐based catalysts, especially Co, Ni, and Fe‐based materials, have attracted extensive attention and been developed as promising electrocatalysts for OER in alkaline media . Moreover, the Co‐based materials have also been reported to act as excellent catalysts for photo/electrocatalytic water oxidation . Nevertheless, for OER in alkaline media, the corrosion of high‐concentration alkaline electrolyte hinders their large‐scale practical applications .…”

mentioning

confidence: 99%

Atomic Iridium Incorporated in Cobalt Hydroxide for Efficient Oxygen Evolution Catalysis in Neutral Electrolyte

et al. 2018

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Developing highly efficient catalysts for oxygen evolution reaction (OER) in neutral media is extremely crucial for microbial electrolysis cells and electrochemical CO reduction. Herein, a facile one-step approach is developed to synthesize a new type of well-dispersed iridium (Ir) incorporated cobalt-based hydroxide nanosheets (nominated as CoIr) for OER. The Ir species as clusters and single atoms are incorporated into the defect-rich hydroxide nanosheets through the formation of rich Co-Ir species, as revealed by systematic synchrotron radiation based X-ray spectroscopic characterizations combining with high-angle annular dark-field scanning transmission electron microscopy measurement. The optimized CoIr with 9.7 wt% Ir content displays highly efficient OER catalytic performance with an overpotential of 373 mV to achieve the current density of 10 mA cm in 1.0 m phosphate buffer solution, significantly outperforming the commercial IrO catalysts. Further characterizations toward the catalyst after undergoing OER process indicate that unique Co oxyhydroxide and high valence Ir species with low-coordination structure are formed due to the high oxidation potentials, which authentically contributes to superior OER performance. This work not only provides a state-of-the-art OER catalyst in neutral media but also unravels the root of the excellent performance based on efficient structural identifications.

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“…Afterward, cobalt oxide or hydroxide has been widely used as the effective cocatalyst for photocatalytic water oxidation. [68][69][70] Hisatomi et al [68] demonstrated the activa tion of BaNbO 2 N by loading a CoO x cocatalyst for photocatalytic O 2 evolution under visible light. The BaNbO 2 N semiconductor has a small bandgap energy of 1.7 eV, allowing light absorption up to 740 nm, which can meet the requirement of 600 nm for sustainable solar water splitting.…”

Section: O 2 Production From Watermentioning

confidence: 99%

Recent Progress in Semiconductor‐Based Nanocomposite Photocatalysts for Solar‐to‐Chemical Energy Conversion

Wang

2017

Advanced Energy Materials

207

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Photocatalysis, which can directly convert solar energy into chemical energy and simultaneously accomplish solar energy conversion and storage objectives, is regarded as one of the most promising strategies to address the energy supply and environmental degradation issues. In recent decades, great efforts and encouraging achievements are performed in the field of semiconductor photocatalysts. Herein, this progress report summarizes the recent investigations and focuses on the advanced semiconductor‐based nanocomposite materials and structures and the novel mechanisms for the photocatalytic solar‐to‐chemical energy conversion. It begins with discussing basic principles for the establishment of an efficient photocatalysis system and illustrating recent studies on improving the elementary processes of photocatalysis, i.e., photophysics and surface/interface chemistry. Then, it demonstrates how the fundamental principles are utilized to enhance the important energy‐conversion‐related reactions, such as light‐driven water splitting, CO2 reduction, nitrogen fixation, organic photosynthesis, etc. Finally, the report concludes the topic on semiconductor‐based nanocomposite photocatalysis along with identifying crucial issues in fundamental studies, challenges in large‐scale industrializations, and perspectives in related research fields.

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Modification of Wide‐Band‐Gap Oxide Semiconductors with Cobalt Hydroxide Nanoclusters for Visible‐Light Water Oxidation

Cited by 80 publications

References 51 publications

Fabrication of vertical orthorhombic/hexagonal tungsten oxide phase junction with high photocatalytic performance

Fabrication of vertical orthorhombic/hexagonal tungsten oxide phase junction with high photocatalytic performance

Atomic Iridium Incorporated in Cobalt Hydroxide for Efficient Oxygen Evolution Catalysis in Neutral Electrolyte

Recent Progress in Semiconductor‐Based Nanocomposite Photocatalysts for Solar‐to‐Chemical Energy Conversion

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