Controllable design of double metal oxide (NiCo<sub>2</sub>O<sub>4</sub>)-modified CdS for efficient photocatalytic hydrogen production

Yan, Xian; Jin, Zhiliang; Zhang, Yupeng; Li, Hai; Ma, Xiuli

doi:10.1039/c8cp07275b

Cited by 55 publications

(16 citation statements)

References 41 publications

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“…The optical and electronic properties of the as‐prepared materials were investigated through UV‐vis absorption spectrum as shown in the inset of Figure a. The NCS displays excellent absorption in the range of 300 to 800 nm which can highly absorb the visible light . In addition, the absorption band gap energy ( E g ) of NCO and NCS can be estimated by the Tauc equation [Eq.…”

Section: Resultsmentioning

confidence: 99%

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Sarawutanukul

Tomon

Duangdangchote

et al. 2020

Batteries & Supercaps

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Using free solar energy in oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) electrocatalysts to enhance the efficiency of zinc‐air batteries (ZABs) has not yet been widely investigated. Herein, we report a photoactive bifunctional catalyst of spinel‐type NiCo2S4 (NCS) urchin‐like structure with rich mesopores and direct band gap energies of ca. 1.4 and 2.4 eV. The NCS catalyst exhibits high catalytic activities for both OER (ɳ=338 mV at 10 mA cm−2) and ORR (ɳ=475 mV at E1/2), comparable to that of the state‐of‐the‐art counterparts (e. g., Pt/C for ORR, RuO2 for OER). Under light illumination, the p‐type photoactive NCS catalyst can absorb visible light, generating photogenerated holes and photoelectrons via the photoelectric effect for direct conversion of photoenergy into electric energy with increasing kinetics charge transfer process and provides ca. 10 and 18.5 % lower OER and ORR overpotentials, respectively than those under the dark condition. In addition, the as‐fabricated zinc‐air battery with the photoactive NCS as the cathode exhibits decrease in voltage gap from 0.82 to 0.60 V with an increasing round‐trip efficiency from 59.2 % to 68.8 % after exposed to visible light. The zinc‐air battery with a reversible redox reaction for the simultaneous conversion of chemical and photoenergy into electric energy could open a new pathway for the utilization of a single energy conversion and storage device.

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Section: Resultsmentioning

confidence: 99%

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Sarawutanukul

Tomon

Duangdangchote

et al. 2020

Batteries & Supercaps

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“…Of these semiconductors, CdS, g-C 3 N 4 , and ZnIn 2 S 4 have received intensive attention since their band gaps match well with the spectrum of sunlight, and their conduction band edges are more negative than the redox potential of H + /H 2 . [4][5][6] Unfortunately, the direct application of these semiconductors themselves for photocatalytic H 2 production is almost infeasible mainly due to their rapid charge recombination. [7][8][9] For an efficient photocatalytic H 2 production reaction, it is indispensable to load a noble metal such as Pt, Pd, Ag, or Au as a cocatalyst on the host semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Prominent roles of Ni(OH)₂ deposited on ZnIn₂S₄ microspheres in efficient charge separation and photocatalytic H₂ evolution

et al. 2021

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“…In such a way, electrochemical water splitting is one of the best ways to split water into oxygen and hydrogen without producing any pollutants. In this view, Honda and Fujishima from Japan in 1972 discovered TiO 2 single crystal decomposed the water in UV light that was a milestone in water splitting research . In electrochemical water splitting, it consists of oxygen evolution (OER) and hydrogen evolution (HER), OER has a sluggish reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Water Oxidation of NiCo₂O₄ and CoNi₂S₄ Nanospheres Supported on Ni Foam Substrate

et al. 2019

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Electrochemical water splitting is an environment-friendly technique for producing clean energy. Low-cost, high performance and robust electro catalysts for electrochemical oxygen evolution reaction (OER) is highly essential for improving the overall efficiency of water splitting. In the present study, NiCo 2 O 4 and CoNi 2 S 4 nanospheres were successfully prepared by employing solvothermal method and optimized at 180°C. XRD result confirmed the formation of cubic structure of both NiCo 2 O 4 and CoNi 2 S 4 nanospheres. SEM images evidently revealed the perfect nanospherical surface morphology of NiCo 2 O 4 and distorted nanospherical morphology of CoNi 2 S 4 . The obtained characteristic Raman active modes of vibrations confirmed the product formation. Photoluminescence study proclaimed the emission behavior of the product. FTIR results confirmed the metal oxygen vibrations such as NiÀ O, CoÀ O and NiÀ S of NiCo 2 O 4 and CoNi 2 S 4 nanospheres. UV spectra and Tauc plot revealed the optical band gaps of Ni and Co based oxide and sulfide nanospheres. Electrochemical studies of optimized NiCo 2 O 4 and CoNi 2 S 4 revealed the respective specific capacitance of 767.067 F/g and 648.11 F/g at scan rate of 10 mVs À 1 in 1 M KOH electrolyte solution. Furthermore, the current density of 331 and 159 mAg À 1 was achieved for the best performed NiCo 2 O 4 and CoNi 2 S 4 electrodes with improved electrical conductivity. The stability over 12 h of highly performed NiCo 2 O 4 nanospheres has been reported. This work suggested a viable and optimized approach to synthesize Ni and Co based oxide and sulfide nanospheres for efficient electrochemical water oxidation.

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Controllable design of double metal oxide (NiCo₂O₄)-modified CdS for efficient photocatalytic hydrogen production

Abstract: In the present study, we have successfully synthesized a kind of high-efficiency NiCo2O4/CdS composite photocatalyst using the hydrothermal method and high-temperature calcination.

Cited by 55 publications

References 41 publications

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Prominent roles of Ni(OH)₂ deposited on ZnIn₂S₄ microspheres in efficient charge separation and photocatalytic H₂ evolution

Electrochemical Water Oxidation of NiCo₂O₄ and CoNi₂S₄ Nanospheres Supported on Ni Foam Substrate

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Controllable design of double metal oxide (NiCo2O4)-modified CdS for efficient photocatalytic hydrogen production

Abstract: In the present study, we have successfully synthesized a kind of high-efficiency NiCo2O4/CdS composite photocatalyst using the hydrothermal method and high-temperature calcination.

Cited by 55 publications

References 41 publications

Rechargeable Photoactive Zn‐Air Batteries Using NiCo2S4 as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Rechargeable Photoactive Zn‐Air Batteries Using NiCo2S4 as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Prominent roles of Ni(OH)2 deposited on ZnIn2S4 microspheres in efficient charge separation and photocatalytic H2 evolution

Electrochemical Water Oxidation of NiCo2O4 and CoNi2S4 Nanospheres Supported on Ni Foam Substrate

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Controllable design of double metal oxide (NiCo₂O₄)-modified CdS for efficient photocatalytic hydrogen production

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Prominent roles of Ni(OH)₂ deposited on ZnIn₂S₄ microspheres in efficient charge separation and photocatalytic H₂ evolution

Electrochemical Water Oxidation of NiCo₂O₄ and CoNi₂S₄ Nanospheres Supported on Ni Foam Substrate