Phosphoric acid resistance PtCu/C oxygen reduction reaction electrocatalyst for HT-PEMFCs: A theoretical and experimental study

Zhang, Xiaoming; Zhao, An; Xia, Zhangxun; Li, Huanqiao; Xu, Xinlong; Yu, Shansheng; Wang, Suli; Sun, Gongquan

doi:10.1016/j.apsusc.2023.156663

Cited by 10 publications

(5 citation statements)

References 45 publications

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“…14.4% (Figure f). By contrast, the MA of commercial Pt/C (Figure S9) dropped by ca. 40.6% after 5K ADT cycles, showing its poor stability.…”

Section: Resultsmentioning

confidence: 89%

“…After adding 0.1 M PA into the electrolyte, the CV curve shows obvious characteristic peak of PA adsorption (Figure S6), and the E 1/2 is shifted negatively by about 52 mV (Figure c), which is obviously lower than those of commercial Pt/C (90 mV) and PtRh/C (111 mV) (Figure S7). In addition, after being treated with concentrated PA at 160 °C for 24 h, the Pt 4f spectra of PtRhCu@Pt/C decreased by 0.1 eV, less than 0.2 eV of commercial Pt/C (Figure S8). The above results indicate that the introduction of Cu endows PtRhCu@Pt/C catalyst with better PA-resistant performance.…”

Section: Resultsmentioning

confidence: 99%

“…(d) LSV and (e) CV curves and (f) MA and ECSA of PtRhCu@Pt/C at different ADT stages. (g) Comprehensive evaluation of activity, stability, and PA resistance. ,,,− Reproduced with permission from reference [Copyright 2023 Elsevier] and references and [Copyright 2024 Wiley] and reference [Copyright 2024 Royal Society of Chemistry] and references ,, and [Copyright 2024 Elsevier].…”

Section: Resultsmentioning

confidence: 99%

“…30 In addition, we screened PA-resistant PtCu/C electrocatalysts based on theoretical research and experimental methods, in which the optimization of the electronic structure of subsurface Cu on surface Pt is the key to achieve PA resistance. 31 Inspired by these results, we hereby designed and prepared PtRhCu@ Pt/C with a dense Pt shell to study the ORR performance and PA resistance of this catalyst. The mass activity (MA) of PtRhCu@Pt/C reaches as high as 0.90 A mg −1 Pt and only drops by about 14.4% after 30K cycles of accelerated durability test (ADT).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we discovered an ultradurable PtRh@Pt electrocatalyst formed from the long-term “self-healing” of PtRh alloy, where the synergy between the inner PtRh alloy and the Pt shell inhibits both Pt dissolution and Rh leaching . In addition, we screened PA-resistant PtCu/C electrocatalysts based on theoretical research and experimental methods, in which the optimization of the electronic structure of subsurface Cu on surface Pt is the key to achieve PA resistance . Inspired by these results, we hereby designed and prepared PtRhCu@Pt/C with a dense Pt shell to study the ORR performance and PA resistance of this catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Ultrastable and Phosphoric Acid-Resistant PtRhCu@Pt Oxygen Reduction Electrocatalyst for High-Temperature Polymer Electrolyte Fuel Cells

An,

Li,

Zhang

et al. 2024

ACS Catal.

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With much enhanced fuel flexibility to overcome the shortcomings of hydrogen production and storage, high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) are still facing challenges of activity loss of oxygen reduction electrocatalyst under the working circumstance of phosphoric acid (PA) electrolyte. Dissolution and leaching of metal component of PtM (M = Cu, Co, Ni•••) electrocatalysts is one of the key factors that degrade their initial resistance toward PA and hinder the accessing of activity and durability simultaneously. Here, we report an ultradurable PtRhCu@Pt/C electrocatalyst with a high mass activity of 0.90 A mg −1 Pt , which only decreased by 14.4% after 30K ADT cycles in the half-cell and reaches the DOE at 2025 target (<30 mV at 0.8 A cm −2 ) with 27 mV voltage loss at 0.8 A cm −2 in the single-cell. After adding 0.1 M PA into the electrolyte, the half-wave potential of PtRhCu@Pt/C is negatively shifted by only 52 mV, much lower than that of commercial Pt/C (90 mV). Moreover, the HT-PEMFC assembled by this catalyst delivers a preeminent peak power density of 529 and 977 mW cm −2 under H 2 −air and H 2 −O 2 conditions, respectively. Experiments and theoretical calculations reveal that the ligand effect arising from the sublayer Cu is attributed to the ability of PA resistance, while the self-healing behavior and the synergy between the PtRhCu core and the Pt shell ensures high stability.

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“…14.4% (Figure f). By contrast, the MA of commercial Pt/C (Figure S9) dropped by ca. 40.6% after 5K ADT cycles, showing its poor stability.…”

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%