Surface states as electron transfer pathway enhanced charge separation in TiO2 nanotube water splitting photoanodes

Zhu, Heng; Zhao, Mengya; Zhou, Jiejie; Li, Wenchao; Wang, Haoyu; Xu, Zhe; Lü, Lei; Pei, Lang; Shi, Zhan; Yan, Shicheng; Li, Zhaosheng; Zou, Zhigang

doi:10.1016/j.apcatb.2018.04.040

Cited by 81 publications

(74 citation statements)

References 70 publications

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“…This suggests that, acting as PEC water oxidation center, the Co terminal can greatly enhance the surface water oxidation kinetics of pristine MQD. [ 36 ] Further renormalizing the photocurrent density with electrochemical active surface area (ECSA), the obvious PEC enhancement achieved by Janus‐structured Co‐MQD still remains unchanged (Figures S25–S27, Supporting Information). This drastically enhanced PEC performance should be attributed to following factors.…”

Section: Resultsmentioning

confidence: 99%

Janus‐Structured Co‐Ti₃C₂ MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation

Tang

Zhou

et al. 2020

Adv Funct Materials

113

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MXene materials have attracted increasing attention in electrochemical energy-storage applications while MXene also becomes photo-active at the quantum dot scale, making it an alternative for solar-energy-conversion devices. A Janus-structured cobalt-nanoparticle-coupled Ti 3 C 2 MXene quantum dot (Co-MQD) Schottky catalyst with tunable cobalt-loading content serving as a photoelectrochemical water oxidation photoanode is demonstrated. The introduction of cobalt triggers concomitant surfaceplasmon effects and acts as a water oxidation center, enabling visiblelight harvesting capability and improving surface reaction kinetics.Most importantly, due to the rectifying effects of Co-MQD Schottky junctions, photogenerated carrier separation/injection efficiency can be fundamentally facilitated. Specifically, Co-MQD-48 exhibits both superior photoelectrocatalysis (2.99 mA cm −2 at 1.23 V vs RHE) and charge migration performance (87.56%), which corresponds to 194% and 236% improvement compared with MQD. Furthermore, excellent photostability can be achieved with less than 6.6% loss for 10 h cycling reaction. This fills in gaps in MXene material research in photoelectrocatalysis and allows for the extension of MXene into optical-related fields.

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Section: Resultsmentioning

confidence: 99%

Janus‐Structured Co‐Ti₃C₂ MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation

Tang

Zhou

et al. 2020

Adv Funct Materials

113

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“…[12][13][14][15] Moreover, some recent studies have suggested that there is an intrinsic hydrated layer on the surface of metal oxide in ambient air or an electrolyte, 6,[16][17][18][19] which also has signicant effects on interface charge separation and transfer. [20][21][22] Is it possible that the intrinsic hydrated layer plays the same role with an extrinsic faradaic layer? In fact, the effects of the intrinsic hydrated layer on photoelectrochemical performance are controversial.…”

Section: Introductionmentioning

confidence: 99%

Mildly regulated intrinsic faradaic layer at the oxide/water interface for improved photoelectrochemical performance

et al. 2020

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“…Notably, a variety of methods, including doping with various elements 6 – 8 , engineering nano-heterostructures with semiconductor quantum dots or metal oxides 9 – 12 , and combining with PM-NPs (typically, Au and Ag) 13 – 31 , have been reported to effectively enhance visible light harvesting of TiO 2 and concomitantly promote carrier separation and transfer. In particular, many PM-NPs/TiO 2 composites have shown remarkably plasmon-enhanced photocatalytic activities towards VLWS by extending light absorption to visible region, which is induced by greatly enhancing local electric field at the interface of PM-NPs and TiO 2 or by injecting hot electrons from photo-excited PM-NPs to TiO 2 via surface plasmon resonance (SPR) effects of the supported PM-NPs 13 – 30 .…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Pt nanoparticles—TiO2 hierarchical nano-architecture as a visible light photocatalyst for water splitting

Qin

Wang

Tan

2018

Sci Rep

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Visible light-driven water splitting (VLWS) into hydrogen and oxygen is attractive and depends on efficient photocatalysts. Herein, we demonstrate the first exploration of the capability to control the morphology of nanostructured TiO2 in conjunction with the choice of a suitable plasmonic metal (PM) to fabricate novel photocatalysts that are capable of harvesting visible light for more efficient VL-fuel conversion. This methodology affords us to successful access to the novel plasmonic Pt/TiO2-HA (large Pt nanoparticles (NPs) supported on TiO2 hierarchical nano-architecture (TiO2-HA)) photocatalysts that exhibit plasmon absorption in the visible range and consequent outstanding activity and durability for VLWS. Particularly, the Pt/TiO2-HA shows an excellent photocatalytic activity for overall water splitting rather than only for hydrogen evolution (HE), which is superior to those of the conventional plasmonic Au/TiO2 photocatalysts. The synergistic effects of the high Schottky barrier at the Pt–TiO2-HA interface, which induces the stronger reduction ability of hot electrons, and intrinsic Pt catalytic activity are responsible for the exceptional photocatalytic performance of Pt/TiO2-HA and simplify the composition of plasmonic photocatalysts.

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Surface states as electron transfer pathway enhanced charge separation in TiO2 nanotube water splitting photoanodes

Cited by 81 publications

References 70 publications

Janus‐Structured Co‐Ti₃C₂ MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation

Janus‐Structured Co‐Ti₃C₂ MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation

Mildly regulated intrinsic faradaic layer at the oxide/water interface for improved photoelectrochemical performance

Plasmonic Pt nanoparticles—TiO2 hierarchical nano-architecture as a visible light photocatalyst for water splitting

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Surface states as electron transfer pathway enhanced charge separation in TiO2 nanotube water splitting photoanodes

Cited by 81 publications

References 70 publications

Janus‐Structured Co‐Ti3C2 MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation

Janus‐Structured Co‐Ti3C2 MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation

Mildly regulated intrinsic faradaic layer at the oxide/water interface for improved photoelectrochemical performance

Plasmonic Pt nanoparticles—TiO2 hierarchical nano-architecture as a visible light photocatalyst for water splitting

Contact Info

Product

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Janus‐Structured Co‐Ti₃C₂ MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation

Janus‐Structured Co‐Ti₃C₂ MXene Quantum Dots as a Schottky Catalyst for High‐Performance Photoelectrochemical Water Oxidation