Gold protective layer decoration and pn homojunction creation as novel strategies to improve photocatalytic activity and stability of the H2-evolving copper (I) oxide photocathode

Le, Hoang D.; Tran, Phong D.; V., Huy; Ung, Thuy Thi Dieu; Nguyen, Long H.

doi:10.1016/j.ijhydene.2018.09.192

Cited by 9 publications

(8 citation statements)

References 38 publications

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“…All-weather harvesting energy and fresh-water via solar-driven water evaporation In comparison to previously reportedisotherms for MOF-801, a shift of the inflection point to higher relativepressures, a lower maximum capacity, and hysteresis were observed. These findings are related to a high degree of single crystallinity of the material 23 . Blending MOF-801 with graphite led to a decrease of the gravimetric capacity corresponding to the added weight, while the general shape of the isotherm was fully retained.…”

Section: Introductionmentioning

confidence: 85%

“…Dr. Phong D. Tran (University of Science and Technology of Hanoi, Vietnam) described the current state-of-the-art of the solar water splitting research. The current progress in the development of noblemetal free catalysts [18][19][20][21][22] , nanostructured light harvesters 23,24 , as well as the catalyst/light harvester assemblage for artificial leaf construction 24 , was also presented. Dr. Tran's group found that the operation of a bias-free leaf displaying 2% solar-to-H 2 conversion yield in pH 7 phosphate buffer solution and under 1 Sun illumination.…”

Section: Introductionmentioning

confidence: 99%

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Enthusiastic discussions on solid physic and material science at SPMS2019

2020

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At 11th National Conference of Solid Physics and Material Science (SPMS2019), to which eminent scientists (5 plenary speakers and 16 invited speakers) were invited, most of the discussion focused on solid physic and material science. Around 300 researchers interested in the subject attended the conference and actively participate in the discussion. There were more than 200 reports with five specialized subcommittees: (A) Physics and magnetic materials, (B) Semiconductor and dielectric physics, (C) Materials - semiconductor components - dielectric, (D) Biomedical materials - agriculture, energy - environment, (E) Composite materials - metals - ceramics. Besides, numerous reports submitted to the Journal of Science and Technology (Vietnam Academy of Science and Technology), full-text reports sent to the Organizing Committee, after a critical review process, had been summarized and published in the Collection of conference reports.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Enthusiastic discussions on solid physic and material science at SPMS2019

2020

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“…Fluorine-doped tin oxide (FTO) purchased from Sigma-Aldrich was cleaned by subsequent sonicating in distilled water, acetone, and then ethanol. Cu 2 O film was grown onto FTO electrode by electrodeposition using a copper lactate deposition bath and following the process described elsewhere [10,26]. The resultant Cu 2 O films (ca.…”

Section: Electrode Fabricationmentioning

confidence: 99%

“…Naturally, a protective layer which can both acts as an electron acceptor and a buffer layer uniformly coating on the surface of Cu 2 O film is desirable. Few materials have been investigated as protective layers for protecting Cu 2 O photocathodes such as Au layer [10], C layer [11], MoS x /graphene composite [12], Cu-based MOF (HKUST-1) [13], WO 3 [14], Ga 2 O 3 [15,16], etc.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous articles, we have demonstrated strategies to improve the performance of the p-Cu 2 O photocathode, namely by coating a thin gold layer or hybrid amorphous MoS x -graphene onto p-Cu 2 O or by creating a p/n-Cu 2 O homojunction [10,12]. These approaches have enhanced the stability and photoelectrocatalytic activity of the photocathode in the hydrogen evolution reaction.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing photoelectrocatalytic activity and stability of p-Cu₂O photocathode through n-TiO₂ coating for improved H₂ evolution reaction

Le,

Ung,

Tran

et al. 2023

J. Phys. D: Appl. Phys.

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This article presents a novel approach to improve both the photoelectrocatalytic activity and stability of the p-Cu2O photocathode. The approach involves the coating of an n-type TiO2 layer using e-beam evaporation with precise controllability of the coating thickness onto the p-type Cu2O electrode, forming a TiO2/Cu2O p/n heterojunction. Such a p/n junction enhances the photoelectrocatalytic activity of the Cu2O electrode by promoting the separation of the photo-generated charge carriers. Additionally, the large bandgap TiO2 coating layer serves as protection, reducing the photocorrosion of Cu2O, thereby improving the stability of the electrode. The n-TiO2/p-Cu2O photocathode shows superior photoelectrochemical H2 evolution activity in comparison to the pristine p-Cu2O photocathode. We have found that the thickness and annealing temperature of TiO2 influence strongly the photocurrent and stability of the resultant TiO2/Cu2O photocathode. The best TiO2/Cu2O photocathode was achieved by coating a 50-nm thick TiO2 layer onto the Cu2O, followed by annealing at 350 C. This configuration exhibited a large onset photovoltage of 0.58 V vs. RHE and a catalytic current density of ~0.9 mA.cm2 at 0 V vs. RHE in a pH 7 phosphate buffer, under standard 1 Sunlight illumination.

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Ca‐Doped PrFeO₃ Photocathodes with Enhanced Photoelectrochemical Activity

Lewis,

Huang,

Itskou

et al. 2024

Solar RRL

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Perovskite oxides, renowned for their adaptable structure and optoelectronic characteristics, hold significant potential for applications in catalysis and photoelectrochemical processes. This research investigates the preparation of praseodymium iron oxide (PrFeO3) by spin coating and the impact of incorporating a calcium (Ca) dopant on its photoelectrochemical efficacy as photocathodes. Spin coating of a polymer containing sol‐gel yielded thin films with uniform morphology and porosity, facilitating effective semiconductor/electrolyte interactions, as characterised by scanning electron microscopy analyses. Evaluation of transient photocurrent responses revealed that introducing Ca at a 5 at% doping level significantly enhanced the photoelectrochemical activity of PrFeO3, resulting in an optimal photocurrent of ‐124 µA cm‐2 at +0.43 VRHE under simulated sunlight conditions. This enhancement was accompanied by an incident photon‐to‐current efficiency of 3.8% at +0.43 VRHE and 350 nm, along with an onset potential of +1.1 VRHE. Ultraviolet and visible spectroscopy analyses indicated an increase in light absorption capabilities in the Ca‐doped films and a noticeable reduction in bandgap compared to the undoped counterparts, further supported by incident photon‐to‐current efficiency measurements. The findings underscore the significant role of dopants in augmenting the photocurrent performance of stable perovskite oxides, highlighting their potential in advancing photon conversion technologies.This article is protected by copyright. All rights reserved.

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Gold protective layer decoration and pn homojunction creation as novel strategies to improve photocatalytic activity and stability of the H2-evolving copper (I) oxide photocathode

Cited by 9 publications

References 38 publications

Enthusiastic discussions on solid physic and material science at SPMS2019

Enthusiastic discussions on solid physic and material science at SPMS2019

Enhancing photoelectrocatalytic activity and stability of p-Cu₂O photocathode through n-TiO₂ coating for improved H₂ evolution reaction

Ca‐Doped PrFeO₃ Photocathodes with Enhanced Photoelectrochemical Activity

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Gold protective layer decoration and pn homojunction creation as novel strategies to improve photocatalytic activity and stability of the H2-evolving copper (I) oxide photocathode

Cited by 9 publications

References 38 publications

Enthusiastic discussions on solid physic and material science at SPMS2019

Enthusiastic discussions on solid physic and material science at SPMS2019

Enhancing photoelectrocatalytic activity and stability of p-Cu2O photocathode through n-TiO2 coating for improved H2 evolution reaction

Ca‐Doped PrFeO3 Photocathodes with Enhanced Photoelectrochemical Activity

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Product

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Enhancing photoelectrocatalytic activity and stability of p-Cu₂O photocathode through n-TiO₂ coating for improved H₂ evolution reaction

Ca‐Doped PrFeO₃ Photocathodes with Enhanced Photoelectrochemical Activity