Journal ArticleDOI
Single-step fabrication of 3D hierarchical ZnO/ZnS heterojunction branched nanowires by MOCVD for enhanced photoelectrochemical water splitting
Mostafa Afifi Hassan,Aadil Waseem,Muhammad Ali Johar,Indrajit V. Bagal,Jun-Seok Ha,Sang-Wan Ryu +5 more
TLDR
In this paper, a scalable single-step growth of three-dimensional hierarchical ZnO/ZnS heterojunction branched nanowires (3D ZnOs/Zns h-b-NWs) on a Si substrate using MOCVD was reported.Abstract:
We report a systematic and scalable single-step growth of three-dimensional hierarchical ZnO/ZnS heterojunction branched nanowires (3D ZnO/ZnS h-b-NWs) on a Si substrate using MOCVD for the first time and their application as photoanodes for photoelectrochemical water splitting (PEC-WS). Vertically well-aligned main trunk ZnO nanowires (MTr-ZnO NWs) were grown on a low-temperature ZnO buffer layer, which was followed by ZnS deposition. Subsequently, hierarchically branched ZnO nanowires (h-b-ZnO NWs) were grown on the side wall of the core–shell heterostructure, which was further modified with a thin layer of ZnS for the growth of multiple ZnO NW branches. The PEC-WS results revealed that the photo-conversion efficiency achieved using MTr-ZnO NWs and 3D ZnO/ZnS h-b-NWs was 0.03% and 0.46% at 0.5 V vs. RHE, respectively, which corresponds to 16-fold enhancement. The achieved improvements can be attributed to the enhanced photoabsorption, which is directly related to the augmented surface area. In addition, ZnS plays a significant role in promoting faster photogenerated carrier transport with high efficiency and visible light absorption by type-II transition at the ZnO/ZnS interface. The novel growth approach that we followed to fabricate the photoanode opens a new avenue for the synthesis of multiple-level hierarchical heterostructures that are beneficial for PEC-WS devices.read more
Citations
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Rational Design of Type-II Nano-heterojunctions for Nanoscale Optoelectronics
TL;DR: In this paper, the authors present an overview of the material and structural design strategies of type-II nano-heterojunctions, such as precise tuning of chemical composition and crystal structure, interface strain engineering, structural optimization, and external field stimulates.
Journal ArticleDOI
Nano tree-like branched structure with α-Ga2O3 covered by γ-Al2O3 for highly efficient detection of solar-blind ultraviolet light using self-powered photoelectrochemical method
Junhua Zhang,Shujie Jiao,Dongbo Wang,Shiyong Gao,Jinzhong Wang,Liancheng Zhao,Liancheng Zhao +6 more
TL;DR: In this paper, a tree-like branched structure with α-Ga2O3 covered by γ-Al 2O3 has been successfully fabricated by simple two-step hydrothermal treatment and applied into the self-powered photoelectrochemical solar-blind detector.
Journal ArticleDOI
Interfacial engineering of lattice coherency at ZnO-ZnS photocatalytic heterojunctions
Xinchen Wang,Allan Lazaroff +1 more
TL;DR: In this paper , the atomic engineering of ZnO-ZnS heterogeneous interfaces, transforming from incoherent characters to semi-coherent counterparts through annealing-induced spontaneous assembly of znS nanoparticles on single-crystalline znO nanowires, is reported.
Journal ArticleDOI
Recent advances and the design criteria of metal sulfide photocathodes and photoanodes for photoelectrocatalysis
TL;DR: In this paper, the vital parameters required for the design of metal sulfide photocathodes and photoanodes are evaluated, and the key design strategies to design a high-performing metal-sulfide photoelectrode are summarized.
Journal ArticleDOI
Progress towards chemical gas sensors: Nanowires and 2D semiconductors
TL;DR: In this paper , an overview of the synthesis and sensing properties of metal oxide nanowires and two-dimensional semiconductor nanostructures such as metal-organic frameworks, graphene and transition metal dichalcogenides is presented.
References
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Photoelectrochemical cells : Materials for clean energy
TL;DR: In this paper, the authors look into the historical background, and present status and development prospects for photoelectrochemical cells, based on nanocrystalline materials and conducting polymer films.
Journal ArticleDOI
Formation of hollow nanocrystals through the nanoscale Kirkendall effect
Yadong Yin,Robert M. Rioux,Can K. Erdonmez,Steven Hughes,Gabor A. Somorjai,A. Paul Alivisatos +5 more
TL;DR: A simple extension of the process yielded platinum–cobalt oxide yolk-shell nanostructures, which may serve as nanoscale reactors in catalytic applications, and provides a general route to the synthesis of hollow nanostructureures of a large number of compounds.
Journal Article
Formation of hollow nanocrystals through the nanoscale kirkendall effect
Yadong Yin,Robert M. Rioux,Can K. Erdonmez,Steven Hughes,Gabor A. Somorjai,A. Paul Alivisatos +5 more
TL;DR: Alivisatos et al. as mentioned in this paper demonstrate that hollow nanocrystals can be synthesized through a mechanism analogous to the Kirkendall Effect, in which pores form due to the difference in diffusion rates between two components in a diffusion couple.
Journal ArticleDOI
Highly active oxide photocathode for photoelectrochemical water reduction
Adriana Paracchino,Vincent Laporte,Kevin Sivula,Michael Grätzel,Elijah Thimsen,Elijah Thimsen +5 more
TL;DR: A highly active photocathode for solar H(2) production is presented, consisting of electrodeposited cuprous oxide, which was protected against photocathodic decomposition in water by nanolayers of Al-doped zinc oxide and titanium oxide and activated for hydrogen evolution with electroDeposited Pt nanoparticles.
Journal ArticleDOI
A Review of Surface Plasmon Resonance‐Enhanced Photocatalysis
Wenbo Hou,Stephen B. Cronin +1 more
TL;DR: In the past decade, surface plasmon resonance of Ag and Au nanoparticles has been investigated to improve the efficiency of photocatalytic processes as discussed by the authors, which is particularly interesting for its ability to store the sun's energy in chemical bonds that can be released later without producing harmful byproducts.