Applied bias photon-to-current conversion efficiency of ZnO enhanced by hybridization with reduced graphene oxide

Hamid, Sharifah Bee Binti O.A Abd; Teh, Swe Jyan; Lai, Chin Wei; Perathoner, Siglinda

doi:10.1016/j.jechem.2016.11.006

Cited by 43 publications

(11 citation statements)

References 65 publications

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“…The applied bias photon-to-current efficiencies (ABPE) of the photoanodes for PEC water splitting were estimated according to the following equation [ 47 ]: where V app is the applied external potential vs. RHE, I is the measured current density, and P incident is the power density of the incident light. The calculated ABPE of the different photoanodes are illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Efficient Photoelectrochemical Water Splitting by g-C3N4/TiO2 Nanotube Array Heterostructures

et al. 2018

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Well-ordered TiO2 nanotube arrays (TNTAs) decorated with graphitic carbon nitride (g-C3N4) were fabricated by anodic oxidization and calcination process. First, TNTAs were prepared via the anodic oxidation of Ti foil in glycerol solution containing fluorinion and 20% deionized water. Subsequently, g-C3N4 film was hydrothermally grown on TNTAs via the hydrogen-bonded cyanuric acid melamine supramolecular complex. The results showed that g-C3N4 was successfully decorated on the TNTAs and the g-C3N4/TNTAs served as an efficient and stable photoanode for photoelectrochemical water splitting. The facile deposition method enables the fabrication of efficient and low-cost photoanodes for renewable energy applications.Electronic supplementary materialThe online version of this article (10.1007/s40820-018-0192-6) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Efficient Photoelectrochemical Water Splitting by g-C3N4/TiO2 Nanotube Array Heterostructures

et al. 2018

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“…ZnO over rGO shows no current at all at 0.2 V vs. RHE, ZnO shows less than 0.1 mA cm À 2 photocurrent density at the given bias with ABPE comparable to that of NZO-1/COF, but at very high bias and in alkaline medium. [65] ZnO grown on thin film although showed very low current density, with high R ct . [66] ZnO based heterojunction with Au NPs has been reported for good PEC performance at neutral pH, but at much higher bias.…”

Section: Resultsmentioning

confidence: 95%

Metformin‐Templated Nanoporous ZnO and Covalent Organic Framework Heterojunction Photoanode for Photoelectrochemical Water Oxidation

et al. 2020

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Photoelectrochemical water-splitting offers unique opportunity in the utilization of abundant solar light energy and water resources to produce hydrogen (renewable energy) and oxygen (clean environment) in the presence of a semiconductor photoanode. Zinc oxide (ZnO), a wide bandgap semiconductor is found to crystallize predominantly in the hexagonal wurtzite phase. Herein, we first report a new crystalline triclinic phase of ZnO by using N-rich antidiabetic drug metformin as a template via hydrothermal synthesis with self-assembled nanorod-like particle morphology. We have fabricated a heterojunction nanocomposite charge carrier photoanode by coupling this porous ZnO with a covalent organic framework, which displayed highly enhanced photocurrent density of 0.62 mA/ cm 2 at 0.2 V vs. RHE in photoelectrochemical water oxidation and excellent photon-to-current conversion efficiency at nearneutral pH vis-à-vis bulk ZnO. This enhancement of the photocurrent for the porous ZnO/COF nanocomposite material over the corresponding bulk ZnO could be attributed to the visible light energy absorption by COF and subsequent efficient charge-carrier mobility via porous ZnO surface.

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“…As shown in Figure d, to explore the connection between voltage and current under the assumption of 100% Faradaic efficiency, applied bias solar energy conversion efficiencies (ABPE) were calculated on the samples by using LSV curves, and the ABPE values were calculated using the following equation normalA normalB normalP normalE ( % ) = true[ j normalp normalh ( m A c m − 2 ) × ( 1.23 − V b i a s ) ( V ) P normalt normalo normalt normala normall ( m W c m − 2 ) true] normalA normalM 1.5 normalG × 100 % where j ph is the photocurrent density obtained under an applied bias ( V bias ), and P total is the incident illumination power density. The ZnO 1– x /3D-Al photoanode achieves a maximum ABPE value, 1.2 times that of ZnO/3D-Al, 1.6 times that of ZnO 1– x /Al, and 2.2 times that of ZnO/Al.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Aluminum Nanostructures Synergizing with Oxygen Vacancies in Zinc Oxides for Enhanced Photoelectrocatalysis

Zhao

Zhou

Xiao

et al. 2023

ACS Appl. Energy Mater.

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Designing a highly efficient and stable electrode is of great importance for photoelectrochemical (PEC) water splitting, which is limited by light absorption and charge separation. Herein, a unique ZnO 1−x /3D-Al composite photoanode consisting of low-cost 3D aluminum (3D-Al) plasmonic material and oxygen-vacant zinc oxide (ZnO 1−x ) nanoparticles was prepared for efficient PEC water splitting for the first time. The plasmonic 3D-Al nanostructure significantly improves the light absorption of the photoanode, which increases the number of photo-generated electron−hole pairs. Meanwhile, the presence of oxygen vacancies further facilitates the generation and separation of photon-induced electron−hole pairs in ZnO 1−x . As a result, the integrated ZnO 1−x /3D-Al photoanode delivers an enhanced photocurrent density of 70.1 μA cm −2 at 1.23 V versus RHE, 2.9 times greater than that of pristine ZnO/Al, attributed to the synergy effect between plasmon resonance in 3D aluminum nanostructures and oxygen vacancies in zinc oxides.

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Applied bias photon-to-current conversion efficiency of ZnO enhanced by hybridization with reduced graphene oxide

Cited by 43 publications

References 65 publications

Efficient Photoelectrochemical Water Splitting by g-C3N4/TiO2 Nanotube Array Heterostructures

Efficient Photoelectrochemical Water Splitting by g-C3N4/TiO2 Nanotube Array Heterostructures

Metformin‐Templated Nanoporous ZnO and Covalent Organic Framework Heterojunction Photoanode for Photoelectrochemical Water Oxidation

Plasmonic Aluminum Nanostructures Synergizing with Oxygen Vacancies in Zinc Oxides for Enhanced Photoelectrocatalysis

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