Interface optimization of ZnO nanorod/CdS quantum dots heterostructure by a facile two-step low-temperature thermal treatment for improved photoelectrochemical water splitting

Nie, Qun; Yang, Liang; Cao, Chang; Zeng, Yamei; Wang, Guizhen; Wang, Cai‐Zhuang; Lin, Shiwei

doi:10.1016/j.cej.2017.05.021

Cited by 73 publications

(44 citation statements)

References 54 publications

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“…Owing to its high theoretical capacity (978 mA h g −1 ), environmental friendliness, adequate resources, and low price, zinc oxide (ZnO) is a suitable anode material for LIBs . However, the bad electrical conductivity and large volume expansion (≈150%) upon Li + insertion/extraction may cause pulverization of the electrode and destruction of the electrical contact, leading to poor rate performances and abrupt capacity fading when used as LIB anodes.…”

Section: Batteriesmentioning

confidence: 99%

The Research Development of Quantum Dots in Electrochemical Energy Storage

Zhan

et al. 2018

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Quantum dots, which are made from semiconductor materials, possess tunable physical dimensions and outstanding optoelectronic characteristics, and they have aroused widespread interest in recent years. In addition to applications in biomolecular analysis, sensors, organic photovoltaic devices, fluorescence, solar cells, photochemical reagents, light-emitting diodes, and catalysis, quantum dots have attracted mounting attention in the field of electrochemical energy storage owing to their size confinement and anisotropic geometry. In this review, a comprehensive summary is given and the research progress of the study of quantum dots for batteries and electrochemical capacitors in recent years, including their synthesis methods, micro/nanostructural features, and electrochemical performance, is appraised.

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Section: Batteriesmentioning

confidence: 99%

The Research Development of Quantum Dots in Electrochemical Energy Storage

Zhan

et al. 2018

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“…It suggests that the Si and Ni co-catalysts are uniformly distributed along the length of the nanorod. It is deserving of note that the development of nanorod with well-defined hexagonal structure was reported by other workers by using expensive patterning methods 44,45 .…”

Section: Resultsmentioning

confidence: 82%

Ultrathin Assembles of Porous Array for Enhanced H2 Evolution

Islam¹,

Teo

Awual

et al. 2020

Sci Rep

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Since the complexity of photocatalyst synthesis process and high cost of noble cocatalyst leftovers a major hurdle to producing hydrogen (H 2 ) from water, a noble metal-free Ni-Si/MgO photocatalyst was realized for the first time to generate H 2 effectively under illumination with visible light. The catalyst was produced by means of simple one-pot solid reaction using self-designed metal reactor. The physiochemical properties of photocatalyst were identified by XRD, FESEM, HRTEM, EDX, UVvisible, XPS, GC and PL. The photocatalytic activities of Ni-Si/MgO photocatalyst at different nickel concentrations were evaluated without adjusting pH, applied voltage, sacrificial agent or electron donor. The ultrathin-nanosheet with hierarchically porous structure of catalyst was found to exhibit higher photocatalytic H 2 production than hexagonal nanorods structured catalyst, which suggests that the randomly branched nanosheets are more active surface to increase the light-harvesting efficiency due to its short electron diffusion path. The catalyst exhibited remarkable performance reaching up to 714 µmolh −1 which is higher among the predominant semiconductor catalyst. The results demonstrated that the photocatalytic reaction irradiated under visible light illumination through the production of hydrogen and hydroxyl radicals on metals. The outcome indicates an important step forward one-pot facile approach to prepare noble ultrathin photocatalyst for hydrogen production from water.Why do we need to promote hydrogen energy? The scientist lays out about four main reasons-energy-saving, minimal ecological impacts, energy security and industrial competitiveness. Industrially, fossil-fuel based hydrogen production process emits greenhouse gas to the environment 1 . The use of solar energy to produce hydrogen from water could accelerate the development of high-impact breakthrough clean energy technologies. By developing an optimal photocatalyst, scientists are searching for the ways of improving clean energy (H 2 ) production from water without producing greenhouse gases or having many adverse effects on the atmosphere.A variety of titanium dioxide (TiO 2 ) phases and nanostructures have been studied extensively for photocatalytic hydrogen production because of its earth-abundance, non-toxicity as well as thermal and chemical stability 1,2 . However, photoirradiated electron recombination and wide band gap of bare TiO 2 remain challenge on efficient hydrogen production. Much work has been directed towards the adaptation of noble Pd, Au metals on the TiO 2 metals 3-5 or through the use of sacrificial reagents 6 . Noble co-catalyst could serve as electron sinks to isolate the photogenerated electron-holes 3 . Moreover, noble metals assist to boost the reaction process by lowering over-potential for proton deduction 4 . Unfortunately, the state-of-the-art co-catalysts are still noble metals (e.g. Pt, Au, Pd) or their oxides that are rare and expensive. As a consequence, the discovery of robust, low-cost and earth-abundant co-catalyst...

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“…The development of nanostructured semiconductors provides a solution to overcome this dilemma due to their unique properties. For example, 0D quantum dots (QDs) with adjustable bandgap can achieve strong visible light absorption . 1D nanorods (NRs) provide direct pathways for electrons transport and reduce length for holes diffusion .…”

Section: Introductionmentioning

confidence: 99%

Periodic FTO IOs/CdS NRs/CdSe Clusters with Superior Light Scattering Ability for Improved Photoelectrochemical Performance

Wang

Nguyen

Yeo

et al. 2020

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Periodic fluorine‐doped tin oxide inverse opals (FTO IOs) grafted with CdS nanorods (NRs) and CdSe clusters are reported for improved photoelectrochemical (PEC) performance. This hierarchical photoanode is fabricated by a combination of dip‐coating, hydrothermal reaction, and chemical bath deposition. The growth of 1D CdS NRs on the periodic walls of 3D FTO IOs forms a unique 3D/1D hierarchical structure, providing a sizeable specific surface area for the loading of CdSe clusters. Significantly, the periodic FTO IOs enable uniform light scattering while the abundant surrounded CdS NRs induce additional random light scattering, combining to give multiple light scattering within the complete hierarchical structure, significantly improving light‐harvesting of CdS NRs and CdSe clusters. The high electron collection ability of FTO IOs and the CdS/CdSe heterojunction formation also contribute to the enhanced charge transport and separation. Due to the incorporation of these enhancement strategies in one hierarchical structure, FTO IOs/CdS NRs/CdSe clusters present an improved PEC performance. The photocurrent density of FTO IOs/CdS NRs/CdSe clusters at 1.23 V versus reversible hydrogen electrode reaches 9.2 mA cm−2, which is 1.43 times greater than that of CdS NRs/CdSe clusters and 3.83 times of CdS NRs.

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Interface optimization of ZnO nanorod/CdS quantum dots heterostructure by a facile two-step low-temperature thermal treatment for improved photoelectrochemical water splitting

Cited by 73 publications

References 54 publications

The Research Development of Quantum Dots in Electrochemical Energy Storage

The Research Development of Quantum Dots in Electrochemical Energy Storage

Ultrathin Assembles of Porous Array for Enhanced H2 Evolution

Periodic FTO IOs/CdS NRs/CdSe Clusters with Superior Light Scattering Ability for Improved Photoelectrochemical Performance

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