Cu2O/InGaN heterojunction thin films with enhanced photoelectrochemical activity for solar water splitting

Alizadeh, Mahdi; Tong, Goh Boon; Qadir, Karwan Wasman; Mehmood, Muhammad Shahid; Rasuli, Reza

doi:10.1016/j.renene.2020.04.107

Cited by 30 publications

(19 citation statements)

References 28 publications

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“…Preparation of InGaN nanorods/Cu 2 O Heterostructure: InGaN nanorods/Cu 2 O heterostructure was obtained by a facile electrodeposition method [24,30] . The electrolyte solution containing of 2 × 10 −3 m copper acetate and 8 × 10 −3 m sodium acetate with a pH of about 5 adjusted by acetic acid was prepared.…”

Section: Methodsmentioning

confidence: 99%

“…[24,28,29] Although the effective charge separation of matrix photoelectrode is achieved, the type-II heterojunction could easily incur the holes accumulation on Cu 2 O, which leads to Cu 2 O oxidation and thus reduce the stability of photoelectrodes. [30][31][32] Therefore, designing the Z-scheme heterostructure photoelectrode via Cu 2 O is most likely to maximize the benefits of heterojunction.…”

Section: Introductionmentioning

confidence: 99%

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Highly Efficient InGaN Nanorods Photoelectrode by Constructing Z‐scheme Charge Transfer System for Unbiased Water Splitting

Lin

Zhang

Chai

et al. 2020

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Unbiased photoelectrochemical water splitting for the promising InGaN nanorods photoelectrode is highly desirable, but it is practically hindered by the serious recombination of charge carrier in bulk and surface of InGaN nanorods. Herein, an unbiased Z‐scheme InGaN nanorods/Cu2O nanoparticles heterostructured system with boosted interfacial charge transfer is constructed for the first time. The introduced Cu2O nanoparticles pose double‐sided effect on photoelectrochemical (PEC) performance of InGaN nanorods, which enables a robust hybrid structure and induces weakened light absorption capability simultaneously. As a result, the optimized InGaN/Cu2O‐1.5C photoelectrode with the uniform morphology exhibits an enhanced photocurrent density of ≈170 µA cm−2 at 0 V versus Pt, with 8.5‐fold enhancement compared with pure InGaN nanorods. Comprehensive investigations into experimental results and theoretical calculations reveal that the electrons accumulation and holes depletion of Cu2O facilitate to form a typical Z‐scheme band alignment, thus providing a large photovoltage to drive unbiased water splitting and enhancing the stability of Cu2O. This work provides a novel and facile strategy to achieve InGaN nanorods and other catalyst‐based PEC water splitting without external bias, and to relieve the bottlenecks of charge transfer dynamics at the electrode bulk and electrode/electrolyte interface by constructing Z‐scheme heterostructure.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Efficient InGaN Nanorods Photoelectrode by Constructing Z‐scheme Charge Transfer System for Unbiased Water Splitting

Lin

Zhang

Chai

et al. 2020

Small

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“…On the basis of DRS result and E g = E VB − E CB , the conduction bottoms of KNbO 3 and ZnO are determined to be −0.90 and −0.53 eV, respectively. The energy band positions of KNO 3 and ZnO can also be calculated based on the empirical formula of E VB = X − E e + 0.5 E g ( Table S2 ) [41] , [42] . Owing to the use of different testing methods, the CB and VB positions of KNbO 3 and ZnO are slightly different [26] , [27] .…”

Section: Resultsmentioning

confidence: 99%

KNbO3/ZnO heterojunction harvesting ultrasonic mechanical energy and solar energy to efficiently degrade methyl orange

Chen

Wang

et al. 2021

Ultrasonics Sonochemistry

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“…In addition, most photocathode materials were based on CdS, [488] MoS 2 , [489] In 2 S 3 , [490] and Cu 2 O. [491] Similarly, several kinds of most promising nano-and micro-structured semiconductors have been employed as photoanodes, which include TiO 2 , [492] BiVO 4 , [493] and Ta 3 N 5 (TaON). [494] Notably, for PEC-based OER reactions, bismuth (Bi)-containing semiconductors have been extensively applied.…”

Section: Binder-free Electrodes For Bifunctional Solar Photoelectroch...mentioning

confidence: 99%

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

Chandrasekaran

Khandelwal

Fan

et al. 2022

Advanced Energy Materials

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Ni, Fe, and Cu foams to form robust binder-free electrodes for high-performance electrocatalytic reactions. [55][56][57][58][59] Interestingly, multidimensional electrocatalysts grown at the nanoscale on a range of current collectors, namely substrates and will benefit from a strong adhesion with the current collector to avoid catalyst delamination, limited active sites, and charge transfer blockage to enhance catalytic reactions (Figure 1b-d). [9,[60][61][62][63][64] Key Prospects, Insights, and the Dynamic Properties of Nano-and Microstructured Binder-Free Electrocatalysts and Their Direct Impact on Electrochemical ReactionsWater splitting has become one of the most important technologies to produce hydrogen (H 2 ) in high purity form. Water splitting includes two half-reactions, namely the cathodic HER and anodic OER. [8,65] Generally, the electrocatalytic performance and activity are highly sensitive to local reaction conditions and is largely valued by the energy required for adsorption/desorption of reaction intermediates and the rupture/creation of chemical bonds. Hence, the conventional powder form of precious metals such as Pt/C for the HER and RuO 2 or IrO 2 for the OER are considered ideal electrocatalysts. [66] In addition, several nonprecious 1D, 2D, and 3D nano-and microstructured powder catalysts such as MoS 2 , WS 2 , Ni 3 S 2 , NiCo 2 S 4 are also of interest for the HER and OER reactions. [54,[67][68][69][70][71][72][73][74] However, for commercial purposes and practical applica-

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Cu2O/InGaN heterojunction thin films with enhanced photoelectrochemical activity for solar water splitting

Cited by 30 publications

References 28 publications

Highly Efficient InGaN Nanorods Photoelectrode by Constructing Z‐scheme Charge Transfer System for Unbiased Water Splitting

Highly Efficient InGaN Nanorods Photoelectrode by Constructing Z‐scheme Charge Transfer System for Unbiased Water Splitting

KNbO3/ZnO heterojunction harvesting ultrasonic mechanical energy and solar energy to efficiently degrade methyl orange

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

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