Hematite photoanodes for solar water splitting: Directly sputtered vs. anodically oxidized sputtered Fe

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73581928" target="_blank" >RIV/61989592:15310/17:73581928 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/17:43914898

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0920586116308410?via%3Dihub" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0920586116308410?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cattod.2016.12.022" target="_blank" >10.1016/j.cattod.2016.12.022</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hematite photoanodes for solar water splitting: Directly sputtered vs. anodically oxidized sputtered Fe

Popis výsledku v původním jazyce

Hematite iron oxide has been extensively studied for photoelectrochemical (PEC) water splitting. Nanostructuring of hematite-based photoanodes represents an effective strategy to supress the negative impact of a short diffusion length of photoexcited holes on the PEC performance. Here we present a comparative structural and photoelectrochemical study of hematite photoanodes fabricated in the forms of two-dimensional (2D) very thin (similar to 25 nm) nanocrystaline films and one-dimensional (1D) nanostructures including nanotubes and nanorods. Hematite films on fluorine-doped tin oxide (FTO) coated glass were prepared by two methods (i) by reactive high-power impulse magnetron sputtering (HiPIMS) and (ii) by anodic oxidation of Fe films deposited on FTO by HiPIMS. While in the first case very thin, dense, compact hematite films were deposited, the second approach yielded transparent nanotubular or nanorod hematite nanostructures. In both cases, the photoelectrochemical response was crucially influenced by the post thermal treatment at 750 degrees C resulting in the Sn4+ diffusion from the FTO substrate and the improvement of conductivity across the FTO/Fe2O3 interface. Fe2O3 films exhibit a photocurrent onset at potential 1.1 V (RHE) with almost linear increase of photocurrent with applied potential. The highest photocurrents were obtained for planar thin hematite electrodes prepared directly by HIPIMS technique (0.55 mA cm(-2) at 0.5 V vs. Ag/AgCl). The observed minimal bias for photoelectrochemical water splitting with hematite photoanode was 1.25 V. For applied potential 0.25 V (vs. Ag/AgCl) and bias 1.3 V, the observed photocurrent density and hydrogen production rate was 0.305 mA/cm(2) and 5.8 mu mol/h/cm(2), respectively.

Název v anglickém jazyce

Hematite photoanodes for solar water splitting: Directly sputtered vs. anodically oxidized sputtered Fe

Popis výsledku anglicky

Hematite iron oxide has been extensively studied for photoelectrochemical (PEC) water splitting. Nanostructuring of hematite-based photoanodes represents an effective strategy to supress the negative impact of a short diffusion length of photoexcited holes on the PEC performance. Here we present a comparative structural and photoelectrochemical study of hematite photoanodes fabricated in the forms of two-dimensional (2D) very thin (similar to 25 nm) nanocrystaline films and one-dimensional (1D) nanostructures including nanotubes and nanorods. Hematite films on fluorine-doped tin oxide (FTO) coated glass were prepared by two methods (i) by reactive high-power impulse magnetron sputtering (HiPIMS) and (ii) by anodic oxidation of Fe films deposited on FTO by HiPIMS. While in the first case very thin, dense, compact hematite films were deposited, the second approach yielded transparent nanotubular or nanorod hematite nanostructures. In both cases, the photoelectrochemical response was crucially influenced by the post thermal treatment at 750 degrees C resulting in the Sn4+ diffusion from the FTO substrate and the improvement of conductivity across the FTO/Fe2O3 interface. Fe2O3 films exhibit a photocurrent onset at potential 1.1 V (RHE) with almost linear increase of photocurrent with applied potential. The highest photocurrents were obtained for planar thin hematite electrodes prepared directly by HIPIMS technique (0.55 mA cm(-2) at 0.5 V vs. Ag/AgCl). The observed minimal bias for photoelectrochemical water splitting with hematite photoanode was 1.25 V. For applied potential 0.25 V (vs. Ag/AgCl) and bias 1.3 V, the observed photocurrent density and hydrogen production rate was 0.305 mA/cm(2) and 5.8 mu mol/h/cm(2), respectively.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA15-19705S" target="_blank" >GA15-19705S: Pokročilé uspořádané nanostruktury, připravené z magnetrony deponovaných kovových slitin, pro fotonické aplikace</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Catalysis Today

ISSN

0920-5861

e-ISSN

—

Svazek periodika

287

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

99-105

Kód UT WoS článku

000399006100016

EID výsledku v databázi Scopus

2-s2.0-85009375041