A titanium carbide (Ti3 C2 Tx ) MXene is employed as an efficient solid support to host a nitrogen (N) and sulfur (S) coordinated ruthenium single atom (RuSA catalyst, which displays superior activity toward the hydrogen evolution reaction (HER). X-ray absorption fine structure spectroscopy aberration corrected scanning transmission electron microscopy reveal atomic dispersion of Ru on Ti3 successful coordination RuSA with N S species MXene. The resultant -N-S-Ti3 catalyst exhibits low...

Hydrogen production via photoelectrochemical water-splitting is a key source of clean and sustainable energy. The use one-dimensional nanostructures as photoelectrodes desirable for applications due to the ultralarge surface areas, lateral carrier extraction schemes, superior light-harvesting capabilities. However, unavoidable states nanostructured materials create additional charge trapping centers energy barriers at semiconductor-electrolyte interface, which severely reduce...

In this work, we design and demonstrate a graphene/silicon (Gr/Si) van der Walls (vdW) heterostructure for high-performance photodetectors, where graphene acts as an efficient carrier collector Si photon absorption layer. The Gr/Si heterojunction exhibits superior Schottky diode characteristics with barrier height of 0.76 eV performs well self-powered detector responding to 532 nm at zero bias.

Despite III-V semiconductors demonstrating extraordinary solar-to-hydrogen (STH) conversion efficiencies, high cost and poor stability greatly impede their practical implementation in photoelectrochemical (PEC) water splitting applications. Here, we present a simple efficient strategy for III-V-based photoelectrodes that functionally spatially decouples the light harvesting component of device from electrolysis part eliminates parasitic absorption, reduces cost, enhances without any...

Photoelectrochemical water splitting is one of the viable approaches to produce clean hydrogen energy from water. Herein, we report MoS2/Si-heterojunction (HJ) photocathode for PEC H2 production. The MoS2/Si-HJ exhibits exceptional production performance with a maximum photocurrent density 36.33 mA/cm2, open circuit potential 0.5 V vs. RHE and achieves improved long-term stability up 10 h reaction time. achieved by significantly higher than most MoS2 coupled Si-based photocathodes reported...

Abstract Realizing solar‐to‐hydrogen (STH) efficiencies close to 20% using low‐cost semiconductors remains a major step toward accomplishing the practical viability of photoelectrochemical (PEC) hydrogen generation technologies. Dual‐absorber tandem cells combining inexpensive are promising strategy achieve high STH at reasonable cost. Here, perovskite photovoltaic biased silicon (Si) photoelectrode is demonstrated for highly efficient stand‐alone solar water splitting. A p + nn ‐Si/Ti/Pt...

Abstract Converting sunlight into a storable form of energy by spontaneous water splitting is great interest but the difficulty in simultaneous management optical, electrical, and catalytic properties has limited efficiency photoelectrochemical (PEC) devices. Herein, we implemented decoupling scheme light harvesting electrocatalysis employing back-buried junction (BBJ) PEC cell design, which enables >95% front side light-harvesting, whereas electrochemical reaction conjunction with...

In recent days, 2-dimensional (2D) niobium disulfide (NbS2) with near-zero Gibbs free energy and superlative acid electrolyte stability has provoked a great deal of interest toward hydrogen evolution reaction (HER) electrocatalyst due to its active basal edge sulfur sites. Herein, we developed single step method for the direct deposition 2D-NbS2 on high-aspect-ratio topographies silicon nanowires (NWs) by chemical vapor applications in HER electrocatalyst. The resultant demonstrates...

Abstract Solar‐driven carbon dioxide reduction reaction (CO 2 RR) provides an opportunity to produce value‐added chemical feedstocks and fuels. However, achieving efficient stable photoelectrochemical (PEC) CO RR into selective products is challenging owing the difficulties associated with optical electrical configuration of PEC devices electrocatalyst properties. Herein, we construct efficient, concentrated sunlight‐driven setup consisting InGaP/GaAs/Ge triple‐junction cell as a photoanode...

ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTImportance of Oxygen Measurements during Photoelectrochemical Water-Splitting ReactionsM. A. KhanM. KhanSABIC-CRD, King Abdullah University Science and Technology (KAUST), Thuwal 23955, Saudi ArabiaMore by M. Khan, Purushothaman VaradhanPurushothaman VaradhanComputer, Electrical, Mathematical Sciences Engineering, KAUST, 23955-6900, Varadhanhttp://orcid.org/0000-0001-7304-5734, Vinoth RamalingamVinoth RamalingamComputer, Ramalingam, Hui-Chun...

Abstract An ideal catalytic interface for photoelectrodes that enables high efficiency and long‐term stability remains one of the keys to unlocking high‐performance solar water splitting. Here, fully decoupled interfaces realized using surface‐structured cocatalyst foils are demonstrated, allowing optimized photoabsorbers be combined with earth‐abundant cocatalysts. Since many cocatalysts deposited via solution‐based methods, deposition on chemical‐sensitive is a significant challenge. By...

A surface optical phonon band has been detected on a single ZnS nanobelt using polarization dependent Raman scattering. The selection rule for SO phonons is broken and attributed to the breaking of anisotropic translational symmetry surface.

Photoelectrochemical (PEC) reactors based on polymer electrolyte membrane (PEM) electrolyzers are an attractive alternative to improve scalability compared conventional monolithic devices. To introduce narrow band gap photoabsorbers such as BiVO4 in PEM–PEC system requires cost-effective and scalable deposition techniques beyond those previously demonstrated FTO-coated glass substrates, followed by the preparation of electrode assemblies. Herein, we address significant challenges coating...

In article number 2000772, Siva Krishna Karuturi, Heping Shen and co-workers report a perovskite/Si dual absorber tandem cell for stand-alone solar water splitting. An unprecedented over 17% solar-to hydrogen conversion efficiency is achieved when Si photocathode paired in with high bandgap (≈1.75 eV) semitransparent perovskite cell.

Hydrogen appears as a next-generation clean energy source to replace fossil fuels. One of the most promising ways produce hydrogen is water splitting using photoelectrochemical (PEC) cell. Silicon widely used in this cell due its viability absorb light. However, efficient catalysis and long-term stability remain key challenges corrosion effect. Here we fabricate highly stable photocathode by integrating crystalline MoS 2 catalyst with specially designed Si-based heterojunction (n + -p-Si)...

Photoelectrochemical splitting of water into hydrogen and oxygen are great interest for the production clean storable form chemical fuels. Silicon, most investigated material as photoelectrode has potential both dual-absorber tandem photoelectrochemical system. However, a major inadequacy in simultaneous achievement efficiency, electrochemical stability, photon management hinders practical prototype based on Si. Herein, we have successfully addressed issues band-structure engineering, light...

Catalysts, chemical stability, and light harvesting are three major challenges in developing high performance photoelectrochemical water-splitting devices. Here we report the significant improvement of using bifacially designed schemes for achieving an ultrahigh solar to hydrogen efficiency 18.22% with ultrafast production rate excellent stability up 370 hr. By deposition appropriate catalyst (Pt) thickness, have successfully balanced trade-off among catalytic reaction, protection,...

Spontaneous splitting of water into hydrogen and oxygen is great attention for a clean storable form chemical fuels. Silicon, the most investigated material has potential to be employed as both single photoelectrode bottom absorber in tandem photoelectrochemical (PEC) system. However, major inadequacy simultaneous achievement optical, electrical management, bandgap engineering limits efficiency. Herein, achieve concurrent enhancement light-harvesting, surface protection catalytic reactions,...

Journal Article NanoCharacterization of Double PN Heterojunctions in Photoelectrochemical Devices Get access Dalaver Anjum, Anjum Khalifa University, Abu Dhabi, United Arab Emirates Search for other works by this author on: Oxford Academic Google Scholar Purushothaman Varadhan King Abdullah University Science & Technology (KAUST), Thuwal, Makkah, Saudi Arabia Microscopy and Microanalysis, Volume 26, Issue S2, 1 August 2020, Pages 1408–1410, https://doi.org/10.1017/S1431927620018000 Published: 01 2020