Nanowire Photoelectrochemistry

Deng, Jiao; Su, Yude; Liu, Dong; Yang, Peidong; Liu, Bin; Liu, Chong

doi:10.1021/acs.chemrev.9b00232

Cited by 185 publications

(145 citation statements)

References 285 publications

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“…The GaN/n + -p Si platform takes advantage of the strong light-harvesting of Si (bandgap of 1.1 eV) and efficient electron extraction/transportation effect as well as large surface area provided by GaN nanowires ( Vanka et al., 2018 ; Zhou et al., 2018 ). The nanowires allow high mass loadings of electrocatalyst and enhance the light absorption with decreased light reflection ( Deng et al., 2019a ). Significantly, the optical absorption and electrochemical reaction are decoupled spatially and functionally in the multi-dimensional structure, providing a unique platform to tune the product distribution by simply varying the cocatalyst composition.…”

Section: Resultsmentioning

confidence: 99%

Decoupling Strategy for Enhanced Syngas Generation from Photoelectrochemical CO2 Reduction

Chu

Rashid

et al. 2020

iScience

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Summary Photoelectrochemical CO 2 reduction into syngas (a mixture of CO and H 2 ) provides a promising route to mitigate greenhouse gas emissions and store intermittent solar energy into value-added chemicals. Design of photoelectrode with high energy conversion efficiency and controllable syngas composition is of central importance but remains challenging. Herein, we report a decoupling strategy using dual cocatalysts to tackle the challenge based on joint computational and experimental investigations. Density functional theory calculations indicate the optimization of syngas generation using a combination of fundamentally distinctive catalytic sites. Experimentally, by integrating spatially separated dual cocatalysts of a CO-generating catalyst and a H 2 -generating catalyst with GaN nanowires on planar Si photocathode, we report a record high applied bias photon-to-current efficiency of 1.88% and controllable syngas products with tunable CO/H 2 ratios (0–10) under one-sun illumination. Moreover, unassisted solar CO 2 reduction with a solar-to-syngas efficiency of 0.63% is demonstrated in a tandem photoelectrochemical cell.

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Section: Resultsmentioning

confidence: 99%

Decoupling Strategy for Enhanced Syngas Generation from Photoelectrochemical CO2 Reduction

Chu

Rashid

et al. 2020

iScience

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“…It is also observed that the absorption capacity of CdS samples increases with the length of nanorods beyond 550 nm and among them the C-18 sample shows the highest absorption features up to near-infrared (NIR) regions. This phenomenon is attributed to the light scattering effect of 1D nanomaterials [51,52]. Usually the photocatalytic activity is determined by the light harvesting capability.…”

Section: Uv-vis Absorption Bandgap and Bandstructure Studiesmentioning

confidence: 99%

Controlled Growth and Bandstructure Properties of One Dimensional Cadmium Sulfide Nanorods for Visible Photocatalytic Hydrogen Evolution Reaction

et al. 2020

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One dimensional (1D) metal sulfide nanostructures are one of the most promising materials for photocatalytic water splitting reactions to produce hydrogen (H 2 ). However, tuning the nanostructural, optical, electrical and chemical properties of metal sulfides is a challenging task for the fabrication of highly efficient photocatalysts. Herein, 1D CdS nanorods (NRs) were synthesized by a facile and low-cost solvothermal method, in which reaction time played a significant role for increasing the length of CdS NRs from 100 nm to several micrometers. It is confirmed that as the length of CdS NR increases, the visible photocatalytic H 2 evolution activity also increases and the CdS NR sample obtained at 18 hr. reaction time exhibited the highest H 2 evolution activity of 206.07 µmol.g −1 .h −1 . The higher H 2 evolution activity is explained by the improved optical absorption properties, enhanced electronic bandstructure and decreased electron-hole recombination rate.Nanomaterials 2020, 10, 619 2 of 17 evolution reactions [18][19][20][21][22][23]. It is testified that the photocatalytic H 2 evolution activity of CdS greatly depends on its crystal structure, morphology, crystallinity and size [24], and all these parameters directly impact the band structures, bandgap energy and further electron-hole separation processes. Therefore, the design and synthesis of CdS nanostructures with higher surface areas, charge separation efficiency and with abundant active sites are indeed important.Meanwhile, one dimensional (1D) CdS nanostructures have received particular attention for the visible photocatalytic H 2 evolution reactions due to their distinctive geometrical and electronic properties, which can provide large aspect-ratio, direct pathways for charge transport and decouple the direction of charge carrier collection [25,26]. In addition to the fast and long-distance photoexcited electron transport, high length-to-diameter of 1D nanostructures could improve the light absorption and scattering, which benefits the photocatalysis [27][28][29][30][31]. As a result, 1D nanostructures offer a suitable platform for understanding fundamental concepts about the roles of dimensionality and size in optical, electrical, and for photocatalytic solar energy conversion applications [27,32]. Among the several methods for the preparation of 1D CdS, the solvothermal approach is one of the ideal methods due to its simplicity, low cost, scalability, possibilities for the precise control of nucleation/growth, crystal structure, size and morphology [33]. Mostly, 1D CdS nanorods were synthesized by using ethylenediamine as solvent, for example, Jang et al utilized the solvothermal approach and obtained CdS nanowires at different reaction temperatures and times [34]. Next, Li et al. synthesized CdS nanorods (NRs) by using the hydrothermal method in which ethylenediamine acts as the template and coordination agent [35]. The results showed that the photocatalytic H 2 evolution activities of CdS samples depend on the crystallinity, morphology and s...

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“…The interface of heterogeneous catalysis plays a key role in catalytic reactions, and the catalytic path is governed by controlling the atomic and electronic structure of interface. Thus, tuning the interface of nanoparticles provides a versatile route for optimization of heterogeneous catalysts, [1][2][3][4][5][6][7][8] and interface design is one of the most significant and promising motivations to boost the electrochemical reactions. [9] Hydrogen has the highest gravimetric energy density among all the chemical fuels, [10] and is thus hailed as the ultimate clean energy carrier.…”

Section: Introductionmentioning

confidence: 99%

Interface Engineering of Partially Phosphidated Co@Co–P@NPCNTs for Highly Enhanced Electrochemical Overall Water Splitting

Jiao

Yang

Pan

et al. 2020

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Interface engineering is promising but still challenging for developing highly efficient and stable non‐noble‐metal‐based electrocatalysts for water splitting. Herein, partially phosphidated core@shell Co@Co–P nanoparticles encapsulated in bamboo‐like N, P co‐doped carbon nanotubes (denoted as Part‐Ph Co@Co–P@NPCNTs) are prepared through a pyrolysis–oxidation–phosphidation strategy. In this structure, each Co nanoparticle is covered with a thin Co–P layer to form a special core@shell heterojunction interface, and the core@shell structure is further encapsulated by N, P co‐doped CNTs that not only protect the Co from corrosion but also guarantee an effective and fast electron transfer on cobalt phosphide. As a bifunctional catalyst for both the hydrogen evolution reaction and oxygen evolution reaction, it exhibits an excellent activity for overall water splitting, and enables long‐term operation without significant degradation. Density functional theory calculations demonstrate that the interface of the Co/Co2P heterojunction could lower the values of ΔGH* (hydrogen adsorption) and ΔGB (water dissociation), which are negatively correlated to the j10, because of the electronic structures of up‐shifted d‐band center. This study not only presents an efficient and stable electrocatalyst for overall water splitting but also provides a special route for the interface engineering of heterostructures.

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Nanowire Photoelectrochemistry

Cited by 185 publications

References 285 publications

Decoupling Strategy for Enhanced Syngas Generation from Photoelectrochemical CO2 Reduction

Decoupling Strategy for Enhanced Syngas Generation from Photoelectrochemical CO2 Reduction

Controlled Growth and Bandstructure Properties of One Dimensional Cadmium Sulfide Nanorods for Visible Photocatalytic Hydrogen Evolution Reaction

Interface Engineering of Partially Phosphidated Co@Co–P@NPCNTs for Highly Enhanced Electrochemical Overall Water Splitting

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