Cobalt selenide: a versatile cocatalyst for photocatalytic water oxidation with visible light

Zhang, Guigang; Zang, Shaohong; Lan, Zhi‐An; Huang, Caijin; Li, Guosheng; Wang, Xinchen

doi:10.1039/c5ta04767f

Cited by 98 publications

(54 citation statements)

References 54 publications

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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

Self Cite

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“…Hence, it has been widely used very recently in many elds such as catalysis, DSSC and electrochemical energy storage system. [21][22][23][24] Wang et al…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal assisted in situ growth of CoSe onto graphene nanosheets as a nanohybrid positive electrode for asymmetric supercapacitors

2017

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Cobalt selenide-graphene (CoSe-G) nanohybrid was successfully synthesised by a simple and facile onepot hydrothermal method and used as a positive electrode for an asymmetric supercapacitor. The CoSe-G nanohybrid electrode exhibits a higher specific capacitance of 1037 F g À1 at 5 mV s À1 than CoSe. The electrochemical impedance studies revealed that the graphene in the nanohybrid not only reduced the contact resistance of the electrode but also significantly increases the electrons transport. The good electrochemical performance of CoSe-G is the synergy between CoSe and graphene. In addition, the asymmetric supercapacitor (ASC) was fabricated using CoSe-G and activated carbon as the positive electrode and negative electrode, respectively, and electrospun PVdF membrane containing 6 M KOH as the separator as well as electrolyte. The fabricated ASC delivered an extended operating voltage window of 1.6 V. It also provides a higher energy density of 45.5 W h kg À1 and a power density of 1.1 kW kg À1 and retains 81% of its initial specific capacitance even after 5000 cycles.

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“…It has been well documented that the four‐electron O 2 evolution reaction requires more energy to break the OH bond and build the OO bond, while the two‐electron process for H 2 O 2 formation could always reach a higher reaction rate, resulting in the preferable generation of H 2 O 2 during the actual water splitting reaction . To accelerate the kinetics of the half water oxidation reaction, Co(OH), CoSe 2 , CoO x , Ni–Co Layered double hydroxides, and cobalt ions were adopted to serve as water oxidation cocatalysts to promote the O 2 production activity of PCN. For the improved overall water splitting activity, various strategies have been developed to modify the PCN based photocatalysts by integrating with metal nanoparticles, metal single atoms, and metal molecular complexes.…”

Section: Photocatalytic Application With Metal/pcn Systemsmentioning

confidence: 99%

Artificial Photosynthesis with Polymeric Carbon Nitride: When Meeting Metal Nanoparticles, Single Atoms, and Molecular Complexes

Kong

Shen

2019

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101

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Artificial photosynthesis for solar water splitting and CO2 reduction to produce hydrogen and hydrocarbon fuels has been considered as one of the most promising ways to solve increasingly serious energy and environmental problems. As a well‐documented metal‐free semiconductor, polymeric carbon nitride (PCN) has been widely used and intensively investigated for photocatalytic water splitting and CO2 reduction, owing to its physicochemical stability, visible‐light response, and facile synthesis. However, PCN as a photocatalyst still suffers from the fast recombination of electron‐hole pairs and poor water redox reaction kinetics, greatly restricting its activity for artificial photosynthesis. Among the various modification approaches developed so far, decorating PCN with metals in different existences of nanoparticles, single atoms and molecular complexes, has been evidently very effective to overcome these limitations to improve photocatalytic performances. In this Review article, a systematic introduction to the state‐of‐the‐art metal/PCN photocatalyst systems is given, with metals in versatility of nanoparticles, single atoms, and molecular complexes. Then, the recent processes of the metal/PCN photocatalyst systems in the applications of artificial photosynthesis, e.g., water splitting and CO2 reduction, are reviewed. Finally, the remaining challenges and opportunities for the development of high efficiency metal/PCN photocatalyst systems are presented and prospected.

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Cobalt selenide: a versatile cocatalyst for photocatalytic water oxidation with visible light

Cited by 98 publications

References 54 publications

Photocatalytic water oxidation by layered Co/h-BCN hybrids

Photocatalytic water oxidation by layered Co/h-BCN hybrids

Hydrothermal assisted in situ growth of CoSe onto graphene nanosheets as a nanohybrid positive electrode for asymmetric supercapacitors

Artificial Photosynthesis with Polymeric Carbon Nitride: When Meeting Metal Nanoparticles, Single Atoms, and Molecular Complexes

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