TY - JOUR
T1 - Solar hydrogen production from seawater splitting using mixed-valence titanium phosphite photocatalyst
AU - Lee, Cheng Ting
AU - Hung, Ling I.
AU - Shih, Yu Chieh
AU - Wu, Jeffrey Chi Sheng
AU - Wang, Sue Lein
AU - Huang, Chao Wei
AU - Nguyen, Van Huy
N1 - Funding Information:
We thank for the financial support from the Ministry of Science and Technology of Taiwan (MOST) under contract no., MOST 108-2113-M-007-010, MOST 106-2113-M-007-023-MY2, MOST 105-2221-E-002-206-MY3 , and Academia Sinica AS-KPQ-106-DDPP .
Publisher Copyright:
© 2020 Elsevier Ltd.
PY - 2021/2
Y1 - 2021/2
N2 - A unique magnesium salt of titanium phosphite (MgTiP) was synthesized by the hydrothermal method and applied for the photocatalytic hydrogen evolution using seawater. The spent MgTiP was analyzed by XPS after photocatalytic reaction indicating that Ti3+ in MgTiP structure was oxidized to Ti4+ by photo-induced holes in a pure water environment, i.e., photo-corrosion. A sacrificial agent, 2mM FeCl2 in the photocatalytic system, could enhance hydrogen evolution and prevent photo-corrosion of MgTiP. Thus this research conducted the reaction of photocatalytic hydrogen evolution using seawater. Two seawater sources were taken from the estuary of the Tamsui River and the east coast of Taiwan. The ions in seawater could act as a sacrificial agent. The result showed that the ions of seawater could enhance photocatalytic hydrogen evolution and also prevent MgTiP from photo-corrosion. The unique 12-membered ring (12R) channels structure of MgTiP with tunable hexa-hydrated magnesium ions showed excellent photo-stability. The concentration of proton (pH) and chloride ions as hole scavenger were favorable factors. Its H2 production rate could reach up to 629.3μmol·gcat-1·h-1 under simulated sunlight. Furthermore, the hydrogen evolution from photocatalytic seawater splitting showed better stability than pure water in a long-term test.
AB - A unique magnesium salt of titanium phosphite (MgTiP) was synthesized by the hydrothermal method and applied for the photocatalytic hydrogen evolution using seawater. The spent MgTiP was analyzed by XPS after photocatalytic reaction indicating that Ti3+ in MgTiP structure was oxidized to Ti4+ by photo-induced holes in a pure water environment, i.e., photo-corrosion. A sacrificial agent, 2mM FeCl2 in the photocatalytic system, could enhance hydrogen evolution and prevent photo-corrosion of MgTiP. Thus this research conducted the reaction of photocatalytic hydrogen evolution using seawater. Two seawater sources were taken from the estuary of the Tamsui River and the east coast of Taiwan. The ions in seawater could act as a sacrificial agent. The result showed that the ions of seawater could enhance photocatalytic hydrogen evolution and also prevent MgTiP from photo-corrosion. The unique 12-membered ring (12R) channels structure of MgTiP with tunable hexa-hydrated magnesium ions showed excellent photo-stability. The concentration of proton (pH) and chloride ions as hole scavenger were favorable factors. Its H2 production rate could reach up to 629.3μmol·gcat-1·h-1 under simulated sunlight. Furthermore, the hydrogen evolution from photocatalytic seawater splitting showed better stability than pure water in a long-term test.
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U2 - 10.1016/j.jece.2020.104826
DO - 10.1016/j.jece.2020.104826
M3 - Article
AN - SCOPUS:85097506942
SN - 2213-3437
VL - 9
JO - Journal of Environmental Chemical Engineering
JF - Journal of Environmental Chemical Engineering
IS - 1
M1 - 104826
ER -
