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Ionic Liquid-Modified Microporous ZnCoNC-Based Electrocatalysts for Polymer Electrolyte Fuel Cells AITranslate

Min Wang; Huixin Zhang; Gnanavel Thirunavukkarasu; Ihtasham Salam; John R. Varcoe; Peter Mardle; Xiaoying Li; Shichun Mu; Shangfeng Du;
University of Birmingham; University of Birmingham; University of Birmingham; University of Surrey; University of Surrey; University of Birmingham; University of Birmingham; Wuhan University of Technology; University of Birmingham
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Abstract AITranslate

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.

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DOI：https://doi.org/10.1021/acsenergylett.9b01407

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Citation Information:

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.

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GB/T 7714-2015 [1] Min Wang, Huixin Zhang, Gnanavel Thirunavukkarasu, et al. ACS Energy Letters, 2019(4). DOI:10.1021/acsenergylett.9b01407.
MLA [1] Min Wang, et al., ACS Energy Letters, no. 4, 2019, https://doi.org/10.1021/acsenergylett.9b01407.
APA [1] Min Wang, Huixin Zhang, Gnanavel Thirunavukkarasu, Ihtasham Salam, John R. Varcoe, Peter Mardle, Xiaoying Li, Shichun Mu, & Shangfeng Du. (2019). ACS Energy Letters(4). https://doi.org/10.1021/acsenergylett.9b01407
IEEE [1] Min Wang, Huixin Zhang, Gnanavel Thirunavukkarasu, Ihtasham Salam, John R. Varcoe, Peter Mardle, Xiaoying Li, Shichun Mu, and Shangfeng Du, ACS Energy Letters, no. 4, 2019, doi: 10.1021/acsenergylett.9b01407.