Programmable Exposure of Pt Active Facets for Efficient Oxygen Reduction

Guanzhi Wang; Zhenzhong Yang; Yingge Du; Yang Yang

doi:10.1002/anie.201907322

Programmable Exposure of Pt Active Facets for Efficient Oxygen Reduction

Guanzhi Wang, Zhenzhong Yang, Yingge Du, Yang Yang

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

97 Scopus citations

Abstract

To produce efficient ORR catalysts with low Pt content, PtNi porous films (PFs) with sufficiently exposed Pt active sites were designed by an approach combining electrochemical bottom-up (electrodeposition) and top-down (anodization) processes. The dynamic oxygen-bubble template (DOBT) programmably controlled by a square-wave potential was used to tune the catalyst morphology and expose Pt active facets in PtNi PFs. Surface-bounded species, such as hydroxyl (OH^*, *=surface site) on the exposed PtNi PFs surfaces were adjusted by the applied anodic voltage, further affecting the dynamic oxygen (O₂) bubbles adsorption on Pt. As a result, PtNi PF with enriched Pt(111) facets (denoted as Pt_{3.5 %}Ni PF) was obtained, showing prominent ORR activity with an onset potential of 0.92 V (vs. RHE) at an ultra-low Pt loading (0.015 mg cm⁻²).

Original language	English
Pages (from-to)	15848-15854
Number of pages	7
Journal	Angewandte Chemie - International Edition
Volume	58
Issue number	44
DOIs	https://doi.org/10.1002/anie.201907322
State	Published - 28 Oct 2019
Externally published	Yes

Keywords

dynamic oxygen-bubble template
facet selectivity
low Pt loading
oxygen reduction
porous films

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title = "Programmable Exposure of Pt Active Facets for Efficient Oxygen Reduction",

abstract = "To produce efficient ORR catalysts with low Pt content, PtNi porous films (PFs) with sufficiently exposed Pt active sites were designed by an approach combining electrochemical bottom-up (electrodeposition) and top-down (anodization) processes. The dynamic oxygen-bubble template (DOBT) programmably controlled by a square-wave potential was used to tune the catalyst morphology and expose Pt active facets in PtNi PFs. Surface-bounded species, such as hydroxyl (OH*, *=surface site) on the exposed PtNi PFs surfaces were adjusted by the applied anodic voltage, further affecting the dynamic oxygen (O2) bubbles adsorption on Pt. As a result, PtNi PF with enriched Pt(111) facets (denoted as Pt3.5 \%Ni PF) was obtained, showing prominent ORR activity with an onset potential of 0.92 V (vs. RHE) at an ultra-low Pt loading (0.015 mg cm−2).",

keywords = "dynamic oxygen-bubble template, facet selectivity, low Pt loading, oxygen reduction, porous films",

author = "Guanzhi Wang and Zhenzhong Yang and Yingge Du and Yang Yang",

note = "Publisher Copyright: {\textcopyright} 2019 Wiley-VCH Verlag GmbH \& Co. KGaA, Weinheim",

year = "2019",

month = oct,

day = "28",

doi = "10.1002/anie.201907322",

language = "英语",

volume = "58",

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journal = "Angewandte Chemie - International Edition",

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TY - JOUR

T1 - Programmable Exposure of Pt Active Facets for Efficient Oxygen Reduction

AU - Wang, Guanzhi

AU - Yang, Zhenzhong

AU - Du, Yingge

AU - Yang, Yang

PY - 2019/10/28

Y1 - 2019/10/28

N2 - To produce efficient ORR catalysts with low Pt content, PtNi porous films (PFs) with sufficiently exposed Pt active sites were designed by an approach combining electrochemical bottom-up (electrodeposition) and top-down (anodization) processes. The dynamic oxygen-bubble template (DOBT) programmably controlled by a square-wave potential was used to tune the catalyst morphology and expose Pt active facets in PtNi PFs. Surface-bounded species, such as hydroxyl (OH*, *=surface site) on the exposed PtNi PFs surfaces were adjusted by the applied anodic voltage, further affecting the dynamic oxygen (O2) bubbles adsorption on Pt. As a result, PtNi PF with enriched Pt(111) facets (denoted as Pt3.5 %Ni PF) was obtained, showing prominent ORR activity with an onset potential of 0.92 V (vs. RHE) at an ultra-low Pt loading (0.015 mg cm−2).

AB - To produce efficient ORR catalysts with low Pt content, PtNi porous films (PFs) with sufficiently exposed Pt active sites were designed by an approach combining electrochemical bottom-up (electrodeposition) and top-down (anodization) processes. The dynamic oxygen-bubble template (DOBT) programmably controlled by a square-wave potential was used to tune the catalyst morphology and expose Pt active facets in PtNi PFs. Surface-bounded species, such as hydroxyl (OH*, *=surface site) on the exposed PtNi PFs surfaces were adjusted by the applied anodic voltage, further affecting the dynamic oxygen (O2) bubbles adsorption on Pt. As a result, PtNi PF with enriched Pt(111) facets (denoted as Pt3.5 %Ni PF) was obtained, showing prominent ORR activity with an onset potential of 0.92 V (vs. RHE) at an ultra-low Pt loading (0.015 mg cm−2).

KW - dynamic oxygen-bubble template

KW - facet selectivity

KW - low Pt loading

KW - oxygen reduction

KW - porous films

UR - https://www.scopus.com/pages/publications/85073653295

U2 - 10.1002/anie.201907322

DO - 10.1002/anie.201907322

M3 - 文章

C2 - 31476100

AN - SCOPUS:85073653295

SN - 1433-7851

VL - 58

SP - 15848

EP - 15854

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

IS - 44

ER -

Programmable Exposure of Pt Active Facets for Efficient Oxygen Reduction

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Keywords

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