Insight into the Transition-Metal Hydroxide Cover Layer for Enhancing Photoelectrochemical Water Oxidation

Xingming Ning; Peiyao Du; Zhengang Han; Jing Chen; Xiaoquan Lu

doi:10.1002/anie.202013014

Insight into the Transition-Metal Hydroxide Cover Layer for Enhancing Photoelectrochemical Water Oxidation

Xingming Ning
, Peiyao Du
, Zhengang Han
, Jing Chen
, Xiaoquan Lu

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

Abstract

Depositing a transition-metal hydroxide (TMH) layer on a photoanode has been demonstrated to enhance photoelectrochemical (PEC) water oxidation. However, the controversial understanding for the improvement origin remains a key challenge to unlock the PEC performance. Herein, by taking BiVO₄/iron-nickel hydroxide (BVO/F_xN_4−x-H) as a prototype, we decoupled the PEC process into two processes including charge transfer and surface catalytic reaction. The kinetic information at the BVO/F_xN_4−x-H and F_xN_4−x-H/electrolyte interfaces was systematically evaluated by employing scanning photoelectrochemical microscopy (SPECM), intensity modulated photocurrent spectroscopy (IMPS) and oxygen evolution reaction (OER) model. It was found that F_xN_4−x-H acts as a charge transporter rather than a sole electrocatalyst. PEC performance improvement is mainly ascribed to the efficient suppression of charge recombination by fast hole transfer kinetics at BVO/F_xN_4−x-H interface.

Original language	English
Pages (from-to)	3504-3509
Number of pages	6
Journal	Angewandte Chemie - International Edition
Volume	60
Issue number	7
DOIs	https://doi.org/10.1002/anie.202013014
State	Published - 15 Feb 2021
Externally published	Yes

Keywords

charge transfer
interfaces
photoelectrochemistry
surface catalysis
transition-metal hydroxides

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10.1002/anie.202013014

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title = "Insight into the Transition-Metal Hydroxide Cover Layer for Enhancing Photoelectrochemical Water Oxidation",

abstract = "Depositing a transition-metal hydroxide (TMH) layer on a photoanode has been demonstrated to enhance photoelectrochemical (PEC) water oxidation. However, the controversial understanding for the improvement origin remains a key challenge to unlock the PEC performance. Herein, by taking BiVO4/iron-nickel hydroxide (BVO/FxN4−x-H) as a prototype, we decoupled the PEC process into two processes including charge transfer and surface catalytic reaction. The kinetic information at the BVO/FxN4−x-H and FxN4−x-H/electrolyte interfaces was systematically evaluated by employing scanning photoelectrochemical microscopy (SPECM), intensity modulated photocurrent spectroscopy (IMPS) and oxygen evolution reaction (OER) model. It was found that FxN4−x-H acts as a charge transporter rather than a sole electrocatalyst. PEC performance improvement is mainly ascribed to the efficient suppression of charge recombination by fast hole transfer kinetics at BVO/FxN4−x-H interface.",

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author = "Xingming Ning and Peiyao Du and Zhengang Han and Jing Chen and Xiaoquan Lu",

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year = "2021",

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doi = "10.1002/anie.202013014",

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T1 - Insight into the Transition-Metal Hydroxide Cover Layer for Enhancing Photoelectrochemical Water Oxidation

AU - Ning, Xingming

AU - Du, Peiyao

AU - Han, Zhengang

AU - Chen, Jing

AU - Lu, Xiaoquan

PY - 2021/2/15

Y1 - 2021/2/15

N2 - Depositing a transition-metal hydroxide (TMH) layer on a photoanode has been demonstrated to enhance photoelectrochemical (PEC) water oxidation. However, the controversial understanding for the improvement origin remains a key challenge to unlock the PEC performance. Herein, by taking BiVO4/iron-nickel hydroxide (BVO/FxN4−x-H) as a prototype, we decoupled the PEC process into two processes including charge transfer and surface catalytic reaction. The kinetic information at the BVO/FxN4−x-H and FxN4−x-H/electrolyte interfaces was systematically evaluated by employing scanning photoelectrochemical microscopy (SPECM), intensity modulated photocurrent spectroscopy (IMPS) and oxygen evolution reaction (OER) model. It was found that FxN4−x-H acts as a charge transporter rather than a sole electrocatalyst. PEC performance improvement is mainly ascribed to the efficient suppression of charge recombination by fast hole transfer kinetics at BVO/FxN4−x-H interface.

AB - Depositing a transition-metal hydroxide (TMH) layer on a photoanode has been demonstrated to enhance photoelectrochemical (PEC) water oxidation. However, the controversial understanding for the improvement origin remains a key challenge to unlock the PEC performance. Herein, by taking BiVO4/iron-nickel hydroxide (BVO/FxN4−x-H) as a prototype, we decoupled the PEC process into two processes including charge transfer and surface catalytic reaction. The kinetic information at the BVO/FxN4−x-H and FxN4−x-H/electrolyte interfaces was systematically evaluated by employing scanning photoelectrochemical microscopy (SPECM), intensity modulated photocurrent spectroscopy (IMPS) and oxygen evolution reaction (OER) model. It was found that FxN4−x-H acts as a charge transporter rather than a sole electrocatalyst. PEC performance improvement is mainly ascribed to the efficient suppression of charge recombination by fast hole transfer kinetics at BVO/FxN4−x-H interface.

KW - charge transfer

KW - interfaces

KW - photoelectrochemistry

KW - surface catalysis

KW - transition-metal hydroxides

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U2 - 10.1002/anie.202013014

DO - 10.1002/anie.202013014

M3 - 文章

C2 - 33105064

AN - SCOPUS:85100602882

SN - 1433-7851

VL - 60

SP - 3504

EP - 3509

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

IS - 7

ER -

Insight into the Transition-Metal Hydroxide Cover Layer for Enhancing Photoelectrochemical Water Oxidation

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Keywords

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