Ionic liquid-modified microporous ZnCoNC-based electrocatalysts for polymer electrolyte fuel cells

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Ionic liquid-modified microporous ZnCoNC-based electrocatalysts for polymer electrolyte fuel cells. / Wang, Min; Zhang, Huixin; Thirunavukkarasu, Gnanavel; Salam, Ihtasham; Varcoe, John R.; Mardle, Peter; Li, Xiaoying; Mu, Shichun; Du, Shangfeng.

In: ACS Energy Letters, Vol. 4, 13.09.2019, p. 2104-2110.

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@article{6aca138d305c46c8be068907feb69ee8,
title = "Ionic liquid-modified microporous ZnCoNC-based electrocatalysts for polymer electrolyte fuel cells",
abstract = "Non-platinum group metal (non-PGM) oxygen reduction reaction (ORR) catalysts have been widely reported, but their application in proton exchange membrane fuel cells (PEMFCs) is challenging because of their poor performance in acidic environments. Here, [BMIM][NTf2] ionic liquid (IL) modification of microporous ZnCoNC catalysts (derived from ZIF-ZnCo) is investigated to study their behavior in PEMFCs and to elucidate the catalytic mechanisms in practical operation. The high O2 solubility of ILs enhances the utilization of active sites with porous ZnCoNC, and their hydrophobic nature facilitates the water transport during fuel cell operation. The half-cell measurement in aqueous HClO4 shows that with the 20 wt % IL modification, the electron-transfer number increases from 2.58 to 3.88, approaching the desired 4-electron-transfer ORR. The power density obtained shows 140% improvement in single-cell PEMFC tests. The catalyst also yields an interesting performance in alkaline anion-exchange membrane fuel cells.",
keywords = "polymer electrolyte fuel cell (PEFC), proton exchange membrane fuel cell (PEMFC), anion exchange membrane fuel cell (AEMFC), CoCN, ZnCoNC, non-PGM, non-platinum group metal, electrocatalyst, ionic liquid, microporous, cathode, durability, oxygen reduction reaction (ORR)",
author = "Min Wang and Huixin Zhang and Gnanavel Thirunavukkarasu and Ihtasham Salam and Varcoe, {John R.} and Peter Mardle and Xiaoying Li and Shichun Mu and Shangfeng Du",
year = "2019",
month = sep,
day = "13",
doi = "10.1021/acsenergylett.9b01407",
language = "English",
volume = "4",
pages = "2104--2110",
journal = "ACS Energy Letters",
issn = "2380-8195",
publisher = "American Chemical Society",

}

RIS

TY - JOUR

T1 - Ionic liquid-modified microporous ZnCoNC-based electrocatalysts for polymer electrolyte fuel cells

AU - Wang, Min

AU - Zhang, Huixin

AU - Thirunavukkarasu, Gnanavel

AU - Salam, Ihtasham

AU - Varcoe, John R.

AU - Mardle, Peter

AU - Li, Xiaoying

AU - Mu, Shichun

AU - Du, Shangfeng

PY - 2019/9/13

Y1 - 2019/9/13

N2 - Non-platinum group metal (non-PGM) oxygen reduction reaction (ORR) catalysts have been widely reported, but their application in proton exchange membrane fuel cells (PEMFCs) is challenging because of their poor performance in acidic environments. Here, [BMIM][NTf2] ionic liquid (IL) modification of microporous ZnCoNC catalysts (derived from ZIF-ZnCo) is investigated to study their behavior in PEMFCs and to elucidate the catalytic mechanisms in practical operation. The high O2 solubility of ILs enhances the utilization of active sites with porous ZnCoNC, and their hydrophobic nature facilitates the water transport during fuel cell operation. The half-cell measurement in aqueous HClO4 shows that with the 20 wt % IL modification, the electron-transfer number increases from 2.58 to 3.88, approaching the desired 4-electron-transfer ORR. The power density obtained shows 140% improvement in single-cell PEMFC tests. The catalyst also yields an interesting performance in alkaline anion-exchange membrane fuel cells.

AB - Non-platinum group metal (non-PGM) oxygen reduction reaction (ORR) catalysts have been widely reported, but their application in proton exchange membrane fuel cells (PEMFCs) is challenging because of their poor performance in acidic environments. Here, [BMIM][NTf2] ionic liquid (IL) modification of microporous ZnCoNC catalysts (derived from ZIF-ZnCo) is investigated to study their behavior in PEMFCs and to elucidate the catalytic mechanisms in practical operation. The high O2 solubility of ILs enhances the utilization of active sites with porous ZnCoNC, and their hydrophobic nature facilitates the water transport during fuel cell operation. The half-cell measurement in aqueous HClO4 shows that with the 20 wt % IL modification, the electron-transfer number increases from 2.58 to 3.88, approaching the desired 4-electron-transfer ORR. The power density obtained shows 140% improvement in single-cell PEMFC tests. The catalyst also yields an interesting performance in alkaline anion-exchange membrane fuel cells.

KW - polymer electrolyte fuel cell (PEFC)

KW - proton exchange membrane fuel cell (PEMFC)

KW - anion exchange membrane fuel cell (AEMFC)

KW - CoCN

KW - ZnCoNC

KW - non-PGM

KW - non-platinum group metal

KW - electrocatalyst

KW - ionic liquid

KW - microporous

KW - cathode

KW - durability

KW - oxygen reduction reaction (ORR)

UR - http://www.scopus.com/inward/record.url?scp=85071380328&partnerID=8YFLogxK

U2 - 10.1021/acsenergylett.9b01407

DO - 10.1021/acsenergylett.9b01407

M3 - Article

VL - 4

SP - 2104

EP - 2110

JO - ACS Energy Letters

JF - ACS Energy Letters

SN - 2380-8195

ER -