Porous Strained Pt Nanostructured Thin-Film Electrocatalysts via Dealloying for PEM Fuel Cells

Chang Kyu Hwang, Jong Min Kim, Sehoon Hwang, Joo Hyung Kim, Chang Hyun Sung, Byung Moo Moon, Keun Hwa Chae, Jitendra Pal Singh, Seung Hoon Kim, Seung Soon Jang, Seung Woo Lee, Hyung Chul Ham, Seunghee Han, Jin Young Kim

Research output: Contribution to journalArticle

Abstract

The exploitation of state-of-the-art Pt/C electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) is mostly limited, due to high Pt loading and durability issues caused by electrochemical instability of the carbon support in high potential regimes. In this study, the authors report that high-compressive 3D Pt nanostructured thin films can considerably increase the catalytic activity and electrochemical durability of electrocatalysts under PEMFC device operating conditions. The nanostructure fabrication relies on the dealloying or selective leaching of solid alloys of Pt–C binary film to produce a residual 3D nanoporous thin-film structure. A very rich structural behavior from the dealloying is shown, in which stress relief plays a governing role; the films possess a 3D structure of randomly interpenetrating ligaments and hierarchical pores with sizes between less than 50 nm and several tens of micrometers. In addition, a significant change is observed in the average lattice constant (1.55% compressive strain), which can tune the structural and electronic states of catalytic sites for enhancing the activity of the Pt electrocatalysts. Electrochemical performance of the fabricated porous strained Pt thin-film electrocatalysts in both half-cell and single-cell analyses has demonstrated activity and durability superior to benchmark carbon support Pt catalysts.

Original languageEnglish
Article number1901326
JournalAdvanced Materials Interfaces
Volume7
Issue number2
DOIs
Publication statusPublished - 2020 Jan 1

Keywords

  • 3D Pt nanostructured thin films
  • compressive strains
  • dealloying
  • oxygen reduction reaction
  • polymer electrolyte membrane fuel cells

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Porous Strained Pt Nanostructured Thin-Film Electrocatalysts via Dealloying for PEM Fuel Cells. / Hwang, Chang Kyu; Kim, Jong Min; Hwang, Sehoon; Kim, Joo Hyung; Sung, Chang Hyun; Moon, Byung Moo; Chae, Keun Hwa; Singh, Jitendra Pal; Kim, Seung Hoon; Jang, Seung Soon; Lee, Seung Woo; Ham, Hyung Chul; Han, Seunghee; Kim, Jin Young.

In: Advanced Materials Interfaces, Vol. 7, No. 2, 1901326, 01.01.2020.

Research output: Contribution to journalArticle

Hwang, CK, Kim, JM, Hwang, S, Kim, JH, Sung, CH, Moon, BM, Chae, KH, Singh, JP, Kim, SH, Jang, SS, Lee, SW, Ham, HC, Han, S & Kim, JY 2020, 'Porous Strained Pt Nanostructured Thin-Film Electrocatalysts via Dealloying for PEM Fuel Cells', Advanced Materials Interfaces, vol. 7, no. 2, 1901326. https://doi.org/10.1002/admi.201901326
Hwang, Chang Kyu ; Kim, Jong Min ; Hwang, Sehoon ; Kim, Joo Hyung ; Sung, Chang Hyun ; Moon, Byung Moo ; Chae, Keun Hwa ; Singh, Jitendra Pal ; Kim, Seung Hoon ; Jang, Seung Soon ; Lee, Seung Woo ; Ham, Hyung Chul ; Han, Seunghee ; Kim, Jin Young. / Porous Strained Pt Nanostructured Thin-Film Electrocatalysts via Dealloying for PEM Fuel Cells. In: Advanced Materials Interfaces. 2020 ; Vol. 7, No. 2.
@article{fffc24d16d3d4493a5be57e2dda6d88d,
title = "Porous Strained Pt Nanostructured Thin-Film Electrocatalysts via Dealloying for PEM Fuel Cells",
abstract = "The exploitation of state-of-the-art Pt/C electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) is mostly limited, due to high Pt loading and durability issues caused by electrochemical instability of the carbon support in high potential regimes. In this study, the authors report that high-compressive 3D Pt nanostructured thin films can considerably increase the catalytic activity and electrochemical durability of electrocatalysts under PEMFC device operating conditions. The nanostructure fabrication relies on the dealloying or selective leaching of solid alloys of Pt–C binary film to produce a residual 3D nanoporous thin-film structure. A very rich structural behavior from the dealloying is shown, in which stress relief plays a governing role; the films possess a 3D structure of randomly interpenetrating ligaments and hierarchical pores with sizes between less than 50 nm and several tens of micrometers. In addition, a significant change is observed in the average lattice constant (1.55{\%} compressive strain), which can tune the structural and electronic states of catalytic sites for enhancing the activity of the Pt electrocatalysts. Electrochemical performance of the fabricated porous strained Pt thin-film electrocatalysts in both half-cell and single-cell analyses has demonstrated activity and durability superior to benchmark carbon support Pt catalysts.",
keywords = "3D Pt nanostructured thin films, compressive strains, dealloying, oxygen reduction reaction, polymer electrolyte membrane fuel cells",
author = "Hwang, {Chang Kyu} and Kim, {Jong Min} and Sehoon Hwang and Kim, {Joo Hyung} and Sung, {Chang Hyun} and Moon, {Byung Moo} and Chae, {Keun Hwa} and Singh, {Jitendra Pal} and Kim, {Seung Hoon} and Jang, {Seung Soon} and Lee, {Seung Woo} and Ham, {Hyung Chul} and Seunghee Han and Kim, {Jin Young}",
year = "2020",
month = "1",
day = "1",
doi = "10.1002/admi.201901326",
language = "English",
volume = "7",
journal = "Advanced Materials Interfaces",
issn = "2196-7350",
publisher = "John Wiley and Sons Ltd",
number = "2",

}

TY - JOUR

T1 - Porous Strained Pt Nanostructured Thin-Film Electrocatalysts via Dealloying for PEM Fuel Cells

AU - Hwang, Chang Kyu

AU - Kim, Jong Min

AU - Hwang, Sehoon

AU - Kim, Joo Hyung

AU - Sung, Chang Hyun

AU - Moon, Byung Moo

AU - Chae, Keun Hwa

AU - Singh, Jitendra Pal

AU - Kim, Seung Hoon

AU - Jang, Seung Soon

AU - Lee, Seung Woo

AU - Ham, Hyung Chul

AU - Han, Seunghee

AU - Kim, Jin Young

PY - 2020/1/1

Y1 - 2020/1/1

N2 - The exploitation of state-of-the-art Pt/C electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) is mostly limited, due to high Pt loading and durability issues caused by electrochemical instability of the carbon support in high potential regimes. In this study, the authors report that high-compressive 3D Pt nanostructured thin films can considerably increase the catalytic activity and electrochemical durability of electrocatalysts under PEMFC device operating conditions. The nanostructure fabrication relies on the dealloying or selective leaching of solid alloys of Pt–C binary film to produce a residual 3D nanoporous thin-film structure. A very rich structural behavior from the dealloying is shown, in which stress relief plays a governing role; the films possess a 3D structure of randomly interpenetrating ligaments and hierarchical pores with sizes between less than 50 nm and several tens of micrometers. In addition, a significant change is observed in the average lattice constant (1.55% compressive strain), which can tune the structural and electronic states of catalytic sites for enhancing the activity of the Pt electrocatalysts. Electrochemical performance of the fabricated porous strained Pt thin-film electrocatalysts in both half-cell and single-cell analyses has demonstrated activity and durability superior to benchmark carbon support Pt catalysts.

AB - The exploitation of state-of-the-art Pt/C electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) is mostly limited, due to high Pt loading and durability issues caused by electrochemical instability of the carbon support in high potential regimes. In this study, the authors report that high-compressive 3D Pt nanostructured thin films can considerably increase the catalytic activity and electrochemical durability of electrocatalysts under PEMFC device operating conditions. The nanostructure fabrication relies on the dealloying or selective leaching of solid alloys of Pt–C binary film to produce a residual 3D nanoporous thin-film structure. A very rich structural behavior from the dealloying is shown, in which stress relief plays a governing role; the films possess a 3D structure of randomly interpenetrating ligaments and hierarchical pores with sizes between less than 50 nm and several tens of micrometers. In addition, a significant change is observed in the average lattice constant (1.55% compressive strain), which can tune the structural and electronic states of catalytic sites for enhancing the activity of the Pt electrocatalysts. Electrochemical performance of the fabricated porous strained Pt thin-film electrocatalysts in both half-cell and single-cell analyses has demonstrated activity and durability superior to benchmark carbon support Pt catalysts.

KW - 3D Pt nanostructured thin films

KW - compressive strains

KW - dealloying

KW - oxygen reduction reaction

KW - polymer electrolyte membrane fuel cells

UR - http://www.scopus.com/inward/record.url?scp=85076374704&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85076374704&partnerID=8YFLogxK

U2 - 10.1002/admi.201901326

DO - 10.1002/admi.201901326

M3 - Article

AN - SCOPUS:85076374704

VL - 7

JO - Advanced Materials Interfaces

JF - Advanced Materials Interfaces

SN - 2196-7350

IS - 2

M1 - 1901326

ER -