A water oxidation side reaction on a photoelectrochemical charging supercapacitor is completely suppressed by controlling the thickness of capacitive material.

Photoelectrochemical (PEC) cells containing photocathodes based on functionalized NiO show a promising solar-to-hydrogen conversion efficiency. Here, we present mechanistic understanding of the photoinduced charge transfer processes occurring at photocathode/electrolyte interface. We demonstrate via advanced photophysical characterization that surface hydroxyl groups formed NiO/water interface not only promote hole from dye into NiO, but also enhance rate recombination. Both are...

Iron-based (oxy)hydroxides are especially attractive electrocatalysts for the oxygen evolution reaction (OER) owing to their earth abundance, low cost, and nontoxicity. However, poor OER kinetics on surface restricts performance of FeOOH electrocatalyst. Herein, a highly efficient stable Ni(OH)2 /β-like electrocatalyst is obtained by facile electroactivation treatment. The activated sample indicates an overpotential 300 mV at 10 mA cm-2 OER, no clear current decay after 50 h testing; this...

Photocatalysis is a promising technology for purification of indoor air by oxidation volatile organic compounds. This study provides comprehensive analysis the adsorption and photo‐oxidation surface‐adsorbed acetone on three SrTiO 3 morphologies: cubes (for which exclusively {100} facets are exposed), {110}‐truncated cubes, {100}‐truncated rhombic dodecahedrons, respectively, all prepared hydrothermal synthesis. In situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy shows that...

The performance of dye-sensitized photoelectrochemical cells is presently limited by the photocathode component. Here, we investigate impact nuclear dynamics on photoinduced charge separation benchmark NiO/P1 system (P1 = 4-(bis-4-(5-(2,2-dicyano-vinyl)-thiophene-2-yl)-phenyl-amino)-benzoic acid). Transient absorption (TA) studies in aqueous environments with different viscosities show that hole injection either proceeds ultrafast (<100 fs) or a sub-ps time window. We assign fastest...

Abstract There is great interest in the development of alternatives to noble metals for plasmonic nanostructures. Transition metal nitrides are promising due their robust refractory properties. However, photophysics these nanostructures, particularly hot carrier dynamics and photothermal response on ultrafast timescales, not well understood. This limits implementation applications such as catalysis or solar thermophotovoltaics. In this study, light‐induced relaxation processes...

Dye-sensitized photoelectrochemical (DSPEC) water splitting is an attractive approach to convert and store solar energy into chemical bonds. However, the conversion efficiency of a DSPEC cell typically low due poor performance photocathode. Here, we demonstrate that Cu-doping improves functionalized NiO-based photocathode significantly. Femtosecond transient absorption experiments show longer-lived photoinduced charge separation for Cu:NiO-based relative undoped analogue. We present...

In the present study, we investigate effects of applied external potential on a dye-sensitized NiO photocathode by time-resolved photoluminescence and femtosecond transient absorption spectroscopy under operating conditions. Instead anticipated acceleration photoinduced hole injection from dye into at more negative potential, observe that both charge recombination are slowed down. We cautiously assign this effect to variation in OH– ion concentration inner Helmholtz plane electrochemical...

Abstract The donor–acceptor (D–A) dye 4‐(bis‐4‐(5‐(2,2‐dicyano‐vinyl)‐thiophene‐2‐yl)‐phenyl‐amino)‐benzoic acid (P1) has been frequently used to functionalize NiO photocathodes and induce photoelectrochemical reduction of protons when coupled a suitable catalyst. Photoinduced twisting the P1 is steered on by co‐adsorption tetradecanoic (C 14 , myristic (MA)). Density Functional Theory time‐resolved photoluminescence studies confirm that lowers energy levels photoexcited D–A dye. apolar...

Semiconductor/Faradaic layer/liquid junctions have been widely used in solar energy conversion and storage devices. However, the charge transfer mechanism of these is still unclear, which leads to inconsistent results low performance devices previous studies. Herein, by using Fe2O3 Ni(OH)2 as models, we precisely control interface structure between semiconductor Faradaic layer investigate semiconductor/Faradaic junction. The suggest that short circuit severely restricts junction for both...

Dye-sensitized photocathodes attract wide interest because of their ease fabrication and tunability in properties for light-driven proton or CO2 reduction. They are often based on nanocrystalline NiO, functionalized with a photosensitizer catalyst, immersed into an aqueous electrolyte optionally saturated CO2. Developing fundamental insight photo- structural dynamics, especially as function the nanostructure process conditions to which photocathode is exposed, essential realize efficient...

Despite the promising performance of Ru nanoparticles or nanoclusters on nanostructured TiO2 in photocatalytic and photothermal reactions, a mechanistic understanding photophysics is limited. The aim this study to uncover nature light-induced processes Ru/TiO2 role UV versus visible excitation by time-resolved photoluminescence (PL) spectroscopy. PL at 267 nm predominantly due TiO2, with minor contribution nanoclusters. Relative following significantly blue-shifted, bathochromic shift time...

NiO electrodes are widely applied in p-type dye-sensitized solar cells (DSSCs) and photoelectrochemical cells, but due to excessive charge recombination, the efficiencies of these devices still too low for commercial applications. To understand which factors induce we studied with a varying number layers benchmark P1 p-DSSCs. We obtained most efficient DSSCs four (0.134%), further insights into this optimum were

A 90 mV cathodic shift of photo-potential a Ta₃N₅photoanode is achieved by increasing the conductivity TiO₂passivation layer.

Abstract A supramolecular photovoltaic strategy is applied to enhance power conversion efficiencies (PCE) of photoelectrochemical devices by suppressing electron–hole recombination after photoinduced electron transfer (PET). Here, the author exploit localization redox mediator—in close proximity dye—through a rotaxane topology, reducing in p ‐type dye‐sensitized solar cells ( ‐DSSCs). Dye P Rotaxane features 1,5‐dioxynaphthalene recognition sites (DNP‐arms) with mechanically‐interlocked...

Quasi-two-dimensional (2D) metal halide perovskites (MHPs) are promising photovoltaic (PV) materials because of their impressive optical and optoelectronic properties improved stability compared to 3D counterparts. The presence domains with varying numbers inorganic layers between the organic spacers (n-phases), each different bandgaps, makes photoinduced carrier dynamics in films these complex intriguing. Existing interpretations ultrafast femto- or picosecond spectroscopy data have been...

Hole transporting layers are very important for solar energy conversion devices, such as perovskite cells, organic photovoltaic devices and water splitting cells. Recently, CuGaO2 a hole layer has attracted intense interest due to its high mobility wide band gap. However, there is still challenge prepare semitransparent film. It desirable develop facile method film with good electronic contact semi-transparency application in devices. Herein, the first time, one-step hydrothermal developed...

Abstract The performance of dye-sensitized photoelectrochemical (DSPEC) cells is currently hampered by the low efficiency photocathode, predominantly due to ineffective charge separation. To promote efficiency, donor-acceptor (D-A) dyes for photosensitization p-type semiconductor have been designed, spatially separating electrons and holes. We further improve on state art manipulating photoinduced twisting a D-A P1 dye adsorbed onto NiO co-adsorption myristic acid, which has carboxyl...

In present study we investigate the effect of external potential on a dye-sensitized NiO photocathode light-induced charge carrier dynamics by time-resolved photoluminescence and femtosecond transient absorption spectroscopy under operating conditions. Instead anticipated acceleration photoinduced hole injection from dye into at more negative applied potential, observe that both recombination are slowed down. We assign this to variation in OH- ion concentration inner Helmholtz plane (IHP)...

Abstract P‐type metal oxides, and in particular NiO, are typically used as hole accepting layers dye‐sensitized photocathodes. Delafossites (CuMO 2 ) with M=B, Al, Cr or Ga have recently been proposed attractive substitutes for theoretically a higher mobility than therefore allowing efficiency when the photocathode is applied solar to fuel devices. We experimentally validated photoelectrochemical performance of photocathodes consisting nanoporous CuBO (CBO) on Fluorine‐doped Tin Oxide...