Metal-Free Carbon-Based Nanomaterial Coatings Protect Silicon Photoanodes in Solar Water-Splitting

Yoon, KunHo; Lee, Jae Hyeok; Kang, Joohoon; Kang, Junmo; Moody, Michael J.; Hersam, Mark C.; Lauhon, Lincoln J.

doi:10.1021/acs.nanolett.6b02691

Cited by 28 publications

(11 citation statements)

References 36 publications

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“…Moreover, a few metal‐free carbon nanomaterials have also been revealed to have positive effects on the OER. For instance, a carbon nanotube (CNT)/graphene composite as an efficient hole‐extraction layer and protection layer to passivate was developed by a facile coating method to enhance the catalytic performance of the Si photoanode for the PEC‐OER ( Figure a) . In this hybrid system, the semiconducting CNTs acted as efficient hole acceptors and transporters to the graphene, and the graphene capping layers both acted as hole‐exchange layers with the electrolyte and protected the CNTs and the Si photoanode.…”

Section: Earth‐abundant Catalysts For Electrocatalysis and Photoelectmentioning

confidence: 99%

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Recent Advances in Earth-Abundant Heterogeneous Electrocatalysts for Photoelectrochemical Water Splitting

2017

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into two half-reactions: the hydrogenevolution reaction (HER) at the cathode, where hydrogen ions or water molecules are reduced to H 2 gas (reduction half-reaction), and the oxygen-evolution reaction (OER) at the anode, where oxygen-containing anions or water molecules are oxidized into O 2 gas (oxidation halfreaction), both of which are vital for the overall efficiency of water splitting. In PEC devices, besides the photochemical pathways (photogenerated charge generation, separation, and migration to the surface of the semiconductor for the HER or OER) in the bulk semiconductors, the earthabundant electrocatalysts are key components for water electrolyzers because they not only can accelerate the photogenerated charge separation and transport driven by the formed interfaces between the light-harvesting semiconductors and electrocatalysts, [6] but they also serve as the reaction sites and catalyze the reactions for the HER and OER (Scheme 1c-e). [7,8] In addition, the electrocatalysts/cocatalysts can generally suppress the photocorrosion and increase the chemical stability of semiconductor photoelectrodes. Therefore, the development of highly efficient, stable, earth-abundant electrocatalysts is urgently required in order to facilitate the PEC-HER and PEC-OER, and improve the reaction kinetics of water splitting, which will eventually increase the overall energy-conversion efficiency. Currently, precious metals remain the most efficient electrocatalysts for PEC water splitting. For instance, Pt-based compounds exhibit the highest HER activity; and Ir (Ru)-group metals work most efficiently for the OER. However, they both suffer from high cost and limited natural availability, which hinders their large-scale commercial applications. Therefore, in order to replace these precious-metal catalysts, considerable efforts have been devoted to the design and synthesis of alternative earth-abundant electrocatalysts for the HER (such as transition-metal phosphides, [9] chalcogenides, [10] carbides, [11] and nitrides [12] ) and for the OER (such as transition-metal phosphates, [13] oxides, [14] hydroxides, [15] perovskites, [16] sulfides, [17,18] selenides, [19,20] tellurides, [21,22] and phosphides [23,24] ), with low cost, high activity, and long-term stability, thus making the overall water splitting practically feasible.Recent rapid progress in the development of non-noblemetal catalysts for the HER and OER have motivated us to review this emerging research field. To the best of our knowledge, although several excellent articles have covered research Photoelectrochemical (PEC) water splitting has been considered as the most promising strategy to obtain hydrogen fuels and oxygen. Developing earthabundant heterogeneous electrocatalysts with high catalytic activity and stability is of great importance for achieving highly efficient water splitting. Here, an overview of the recent developments in the earth-abundant heterogeneous electrocatalysts for PEC water splitting is presented. The main earth-abundant electrocatalysts...

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Section: Earth‐abundant Catalysts For Electrocatalysis and Photoelectmentioning

confidence: 99%

Section: Earth‐abundant Catalysts For Electrocatalysis and Photoelectmentioning

confidence: 99%

Recent Advances in Earth-Abundant Heterogeneous Electrocatalysts for Photoelectrochemical Water Splitting

2017

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“…), metal nitrides and phosphides (GaN, Ta 3 N 5 , etc.) and Si . Unfortunately, there is no semiconductor that can meet all the above requirements simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Tungsten Trioxide Nanostructures for Photoelectrochemical Water Splitting: Material Engineering and Charge Carrier Dynamic Manipulation

Wang

Tian

Chen

et al. 2019

Adv Funct Materials

142

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To address the energy crisis and environmental problems, the applications of solar energy have received intensive attention. Converting solar energy to hydrogen using a photoelectrochemical (PEC) cell is one of the most promising approaches to meet future energy demands. As an earth abundant metal oxide, tungsten trioxide (WO3), which has a moderate band gap (2.5–2.7 eV), ideal valence band position, and high resistance to photocorrosion, has been widely utilized in PEC photoanodes. To obtain a WO3 photoanode with high PEC efficiency, tremendous efforts have been made to improve the light absorption capacity, charge carrier dynamics, and oxygen evolution activity. In this report, the recent advances in WO3 photoanode optimization, including morphology design, dopants doping, heterojunction fabrication, and surface modification are summarized. In this review, these developments and representative applications of WO3 photoanodes in unassisted water splitting devices are also discussed. Finally, perspectives on the significant challenges and future prospects for the development of WO3 photoanodes for PEC water splitting are provided.

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“…One factor is that heavy or precious metal elements are not utilized in convenient synthetic works for environmental and inexpensive targets. Another factor is understandable photoluminescence property, it keeps high stability and intensity during in fabricating different dimensional constructions through self‐assemble or doping metals in original colloidal synthesis methods . These two appointments reveal the relevant necessities in further studies.…”

mentioning

confidence: 99%

Self‐Assembly of Biocompatible FeSe Hollow Nanostructures and 2D CuFeSe Nanosheets with One‐ and Two‐Photon Luminescence Properties

Deng

Ning

et al. 2019

Small

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Se-based semiconductors are produced in organisms with hydrophobic alkyl-chains, it appears highly monodispersity and uniformity, distinguished optical properties, and long-time stability features in different characterizations. [5,6] Up to present, there exhibits following photoluminescence of semiconductors: (1) fabricated different dimensional construction such as Ag 2 Se quantum dots, CdTe nanowires (NWs), nanosheets (NSs), and heterogeneous Au@CdTe core-shell structure [7,8] ; (2) the alloyed structure such as CdSeS, CdZnSe, ZnSSe, CdHgTe, CdPbS, CdZnS, CdInSe, AgInSe, AgInS, and so on. The heavy metal elements restrict its further applications in biological, especially makes controversial in imaging applications, and biomedical diagnosis [9][10][11] ; (3) environmentally friendly QDs and derivatives materials, Such as InP,ZnS,Ag 2 S, Ag 2 Se,CdS, ZnSe, CdSe, and GaSe and so on. [12][13][14] In order to establish proper approaches to overcome the heavy metal toxicity, hydrophobic attachment, and simplex dimension during investigating the possible candidates, resultant should be acceptable in maintaining relatively optical properties, and understandable in fabricating procedures. [15][16][17][18][19][20][21] One factor is that heavy or precious metal elements are not utilized in convenient synthetic works for environmental and inexpensive Transition metal chalcogenides are investigated for catalyst, intermediary agency, and particular optical properties because of their distinguished electron-vacancy-transfer (EVT) process toward different applications. In this work, one convenient approach for making pure-phased FeSe nanocrystals (NCs) and doped CuFeSe nanosheets (NSs) through a wet chemistry method in mixed solvents is illustrated. The surface modification of each product is realized by using a peptide molecule glutathione (GSH), in which the thiol group (−SH) is ascribed to be the in situ reducer and bonding agency between the crystalline surface and surfactant in whole constructing processes. Due to the functional groups in biological GSH, highly aggregated NCs are rebuilt in the form of an FeSe hollow structure through amino and carboxyl cross-linking functions through a spontaneous assembly procedure. Owing to the coupling procedure of Cu and Fe in the growth process, it generates enhanced EVT. Additionally, it shows the emission spectra of λ EM-PL = 436 nm (FeSe) and 452 nm (CuFeSe) while λ EX-PL = 356 nm, it also conveys two-photon phenomenon while λ EX-PL = 720 nm. Moreover, it also shows strong off-resonant luminescence due to two-photon absorption, which should be valuable for biological applications.

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Metal-Free Carbon-Based Nanomaterial Coatings Protect Silicon Photoanodes in Solar Water-Splitting

Cited by 28 publications

References 36 publications

Recent Advances in Earth-Abundant Heterogeneous Electrocatalysts for Photoelectrochemical Water Splitting

Recent Advances in Earth-Abundant Heterogeneous Electrocatalysts for Photoelectrochemical Water Splitting

Tungsten Trioxide Nanostructures for Photoelectrochemical Water Splitting: Material Engineering and Charge Carrier Dynamic Manipulation

Self‐Assembly of Biocompatible FeSe Hollow Nanostructures and 2D CuFeSe Nanosheets with One‐ and Two‐Photon Luminescence Properties

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