Layered Co(OH)<sub>2</sub> Deposited Polymeric Carbon Nitrides for Photocatalytic Water Oxidation

Zhang, Guigang; Zang, Shaohong; Wang, Xinchen

doi:10.1021/cs502002u

Cited by 347 publications

(200 citation statements)

References 53 publications

(26 reference statements)

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“…S11) . An excessive amount of Co modifier leads to a decrease in the water oxidation activity, which could be ascribed to the light shielding effect [45][46][47]. Fig.…”

Section: Science China Materialsmentioning

confidence: 99%

Photocatalytic water oxidation by layered Co/h-BCN hybrids

et al. 2015

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The search for new materials has progressed from metal-based photocatalysts to elemental semiconductors (C, Si, P, S, B) [11][12][13][14][15] and recently to metal-free binary materials and polymers, such as carbon nitride [16], boron carbide [17] and conjugated semiconductors [18][19][20]. These researches indicate that photon absorbing materials can be constituted by using lightweight elements such as carbon, nitrogen, and boron, opening up new opportunities for the selection of innovative and intriguing materials for artificial photosynthesis. It is of particular interest that some of these elements themselves (graphene [21], silicone [22]) or their combinations (h-BN, g-C 3 N 4 ) [23] can form layered structures with reduced thickness comparable to charge-diffusion distance, and thus if a semiconducting electronic structure was imparted in these materials, the fast separation of light-induced charge carrier would significantly benefit surface photoredox process that relied on the excitation and separation of electron-hole pairs and their subsequent participation in surface chemical reactions [24][25][26]. An interesting case of such a layered material is ternary h-BCN with tuneable ba nd gap energies between graphene (zero bandgap) and h-BN (bandgap = 5.6 eV) [27], which have the same atomic structure and share many similar properties. The hybridized phases of the two two-dimensional (2D) materials by atomic mixture of B, N, and C with broad composition ranges to create various layered semiconducting structures would produce new material functions complementary to graphene and h-BN, enabling a wide variety of electronic structures, applications and properties [28][29][30]. Such an emerging family of chemically inert and mechanically strong 2D materials practically allows the bandgap-engineered applications in heterogeneous photocatalysis by creating a medium-gap ternary semiconductor, in which the band gap, redox energy levels, p/n-type properties and surface acid-base chemistry can in principle be modulated by rational design and synthesis [31,32].A hexagonal boron carbon nitride (h-BCN) semiconductor was applied to intercalate cobalt ions to catalyze oxygen evolution reaction (OER) with light illumination, without using noble metals. The h-BCN with high specific surface area showed a strong chemical affinity towards metal ions due to the "lop-sided" densities characteristic of ionic B-N bonding, enabling the creation of metal/h-BCN hybrid layered structures with unique properties. As exemplified here by Co/h-BCN for water oxidation catalysis, after intercalating cobalt ions in the h-BCN host, the photocatalytic activity of the resultant layered hybrid is optimized due to their synergic catalysis that promotes charge separation and lowers reaction barriers. This finding promises a new nobel-metal-free nanocompsite using cost-acceptable and earth-abundant sust ances for photocatalytic OER, and enables the facile design of duel catalytic cascades by merging transition metal catalysis with h-BCN (photo)catalys...

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“…S11) . An excessive amount of Co modifier leads to a decrease in the water oxidation activity, which could be ascribed to the light shielding effect [45][46][47]. Fig.…”

Section: Science China Materialsmentioning

confidence: 99%

Photocatalytic water oxidation by layered Co/h-BCN hybrids

et al. 2015

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“…Loading oxygen-evolution cocatalysts (OECs) has been considered as an effective approach to accelerate the surface reaction kinetics and reduce oxygen evolution reaction (OER) barrier of semiconductor materials [7,13,19,20]. Although traditional noble metal oxides, such as IrO2 and RuO2, are considered as the most active OER electrocatalysts for OECs in PEC cells [5,14], the high cost and low stability limit their extensive applications [7].…”

Section: Introductionmentioning

confidence: 99%

Promoting charge carrier utilization by integrating layered double hydroxide nanosheet arrays with porous BiVO4 photoanode for efficient photoelectrochemical water splitting

Huang

Xin

et al. 2017

Sci. China Mater.

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The increasing exploration of renewable and clean power sources have driven the development of highly active materials for photoelectrochemical (PEC) water splitting. However, it is still a great challenge to enhance the charge utilization. Herein, we report a facile method to fabricate composite photoanode with porous BiVO4 film as the photon absorber and layered double hydroxide (LDH) nanosheet arrays as the oxygen-evolution cocatalysts (OECs). The as-prepared BiVO4/NiFe-LDH photoanode shows an excellent performance for PEC water splitting benefitting from the synergistic effect of the superior charge separation efficiency facilitated by porous BiVO4 film and the excellent water oxidation activity resulting from LDH nanosheet arrays. A photocurrent density is 4.02 mA cm −2 at 1.23 V vs. the reversible hydrogen electrode (RHE). Furthermore, the O2 evolution rate at the surface of BiVO4/NiFe-LDH photoanode is as high as 29.6 µmol h −1 cm −2 and the high activity for water oxidation is maintained for over 30 h. Impressively, the performance of the as-fabricated composite photoanode for PEC water splitting can be further enhanced through incorporating a certain amount of Co 2+ cation into NiFe-LDH as OEC. The photocurrent density is achieved up to 4.45 mA cm −2 at 1.23 V vs. RHE. This value is the highest yet reported for un-doped BiVO4-based photoanodes so far.

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“…Lee et al decorated cobalt phosphate (CoPi) catalyst on the surface of mpg-C 3 N 4 via direct photodeposition of Co 2+ ions in a phosphate buffer solution or first deposition of metallic cobalt nanoparticles and then conversion of metallic nanoparticles to CoPi on mpg-C 3 N 4 . 82 The as-prepared CoPi/mpg-C 3 N 4 is active for both HER and OER half reactions in the presence of suitable hole and electron scavenger, respectively. CoPi, a widely studied OER catalyst, was found to be converted in situ to Co-oxo/hydroxo-phosphate which is an active electrocatalyst for HER when a hole scavenger exists.…”

Section: G-c 3 N 4 Based Photocatalysts For Oxygen Evolution and Overmentioning

confidence: 99%

Recent progress in g-C₃N₄ based low cost photocatalytic system: activity enhancement and emerging applications

Yin

Han

Zhou

et al. 2015

Catal. Sci. Technol.

215

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Graphitic C3N4 (g-C3N4) has continuously attracted attentions since it was reported as a metal free semiconductor for water splitting. However, its ability for evolving hydrogen from water is significantly dependent on the use of noble metal co-catalyst, mainly Pt. In recent years, a good progress has been achieved in developing cocatalysts containing earth abundant elements only for constructing low cost and efficient g-C3N4 based photocatalytic systems. Besides, exfoliation of bulk g-C3N4 into two dimensional g-C3N4 nanosheets offers large surface area and exposed active sites, which are beneficial for activity enhancement. Furthermore, oxygen evolution and CO2 photoreduction over g-C3N4 have caught increasing interests due to the demand to achieve overall water splitting and conversion of CO2 into chemicals and fuels. In this mini-review, we will briefly summarize the latest research works on g-C3N4 based photocatalytic systems during the last three years with emphasis on the progress achieved in enhancing hydrogen evolution activity of g-C3N4 by loading noble metal free co-catalysts, exfoliating bulk g-C3N4 into nanosheets, and the application of g-C3N4 system in photocatalytic O2 evolution and CO2 reduction.

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Layered Co(OH)₂ Deposited Polymeric Carbon Nitrides for Photocatalytic Water Oxidation

Cited by 347 publications

References 53 publications

Photocatalytic water oxidation by layered Co/h-BCN hybrids

Photocatalytic water oxidation by layered Co/h-BCN hybrids

Promoting charge carrier utilization by integrating layered double hydroxide nanosheet arrays with porous BiVO4 photoanode for efficient photoelectrochemical water splitting

Recent progress in g-C₃N₄ based low cost photocatalytic system: activity enhancement and emerging applications

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Layered Co(OH)2 Deposited Polymeric Carbon Nitrides for Photocatalytic Water Oxidation

Cited by 347 publications

References 53 publications

Photocatalytic water oxidation by layered Co/h-BCN hybrids

Photocatalytic water oxidation by layered Co/h-BCN hybrids

Promoting charge carrier utilization by integrating layered double hydroxide nanosheet arrays with porous BiVO4 photoanode for efficient photoelectrochemical water splitting

Recent progress in g-C3N4 based low cost photocatalytic system: activity enhancement and emerging applications

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Layered Co(OH)₂ Deposited Polymeric Carbon Nitrides for Photocatalytic Water Oxidation

Recent progress in g-C₃N₄ based low cost photocatalytic system: activity enhancement and emerging applications