Doping oxygen triggered electrocatalytic activity of carbon interpenetrating networks in acid electrolyte

Zhang, Jin; Bai, Lu; Jin, Chun; Xiao, Mingyue; Liu, Jingjun

doi:10.1016/j.ijhydene.2022.08.003

Cited by 3 publications

(3 citation statements)

References 59 publications

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“…Based on the calculated binding energies, the above three defective sites are stable in structure but the edge structure has the lowest binding energy compared to the other two defective structures shown in Figure 2b, which reveals the added W atoms are preferentially located at the edge sites during microalloying process. [ 20 ] It offers direct proof for the presence of the majority edge stabilized by the W atom in the synthesized nanoalloys. From Figure 2c, all the recorded Pt–Pt distances in these defective structures are lower than that of pure Pt (2.775 Å).…”

Section: Resultsmentioning

confidence: 99%

Trace Tungsten Microalloying PtCuCo Medium Entropy Alloys: Substructure Reconstruction‐Triggered High‐Performance for PEMFC

Chen

Wang

Jin

et al. 2023

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Refractory metals (W, Nb, or Mo) microalloying Pt‐based alloys with unprecedented performance may serve as advanced electrocatalysts for proton exchange membrane fuel cells (PEMFCs). These alloys are endowed with unique stabilizing substructures or lattice defects through the microalloying effect. Herein, trace W microalloying PtCuCo medium entropy alloys (W‐PtCuCo) are reported via a stepwise synthesis strategy, starting with home‐made Cu nanowires as sacrificial templates by anhydrous solid‐phase milling route, and then followed by galvanic replacement‐assisted solvothermal in ethylene glycol (EG). In PEMFC tests, the obtained W‐PtCuCo exhibits an ultrahigh peak power density and mass power density (relative to cathode) reaching 2.09 W cm−2 and 20.9 W mgPt−1, respectively. During the accelerated degradation test (ADT), the mass activity just lost only 3% after 30 k cycles, much better than the above benchmark catalyst. The microalloying‐dependent performances shall be attributed to the presence of abundant stepped surfaces, twisted edges, and other lattice defects terminated by W via substructure reconstruction that indeed alters the electronic structure and strain level of the alloys. This work first provides an atomic‐level insight into the microalloying‐dependent electrocatalytic performance of Pt‐based alloys, which is of great significance for developing next‐generation efficient catalysts for PEMFC.

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Section: Resultsmentioning

confidence: 99%

Trace Tungsten Microalloying PtCuCo Medium Entropy Alloys: Substructure Reconstruction‐Triggered High‐Performance for PEMFC

Chen

Wang

Jin

et al. 2023

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“…Figure a shows a schematic diagram of the applied voltage solid‐phase post‐processing with 15 V voltage for homemade Fe─N─C catalysts with self‐supporting structure, composed of carbon nanotubes (CNTs) and carbon nanoparticles (CNPs) derived from polyaniline (PANI) and zinc‐zeolitic imidazolate frameworks (ZIF‐8) respectively, based on our previous work. [ 28 ] After controllable pyrolysis carbonization of PANI epitaxially grown ZIF‐8 with FeCl 3 , the components in the obtained carbon‐based composites are connected, forming an interpenetrating network (IPN) structure, (SEM and TEM images in Figures S1 and S2, Supporting Information), where the CNPs derived from ZIF‐8 are fixed on the nodes of the PANI derived CNT network. And then, a voltage of 15 V is applied to the solid‐state Fe─N─C powder to obtain the VA target Fe─N─C catalyst (denoted as Fe─N─C@15 V).…”

Section: Resultsmentioning

confidence: 99%

“…[ 12 ] Our previous work shows that the doped O atoms in carbons may affect the structure of FeN 4 through structural interactions and chemical bonding. [ 28 ] So, it is vital to investigate and identify the exact active sites, which should be different from those obtained by the untreated one. For the treated catalyst, the amount of O atoms dramatically increases (from 7.63% to 11.99%) compared with the original Fe─N─C, based on XPS results in Figures S15, S37 and S38 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Applied Voltage‐Activated Fe─N─C Catalysts for Pem Fuel Cells

Wang,

Zhang,

Wang

et al. 2024

Advanced Sustainable Systems

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The practical application of non‐precious Fe─N─C catalysts in proton exchange membrane fuel cells (PEMFCs) continues to remain one of the major challenges due to their relatively poor oxygen reduction reaction (ORR) performance in acid. In this work, a fast and facilely performance enhancement strategy is first proposed for various Fe─N─C catalysts by supplying different direct‐current voltages to achieve a rapid solid‐state activation at room temperature. The voltage‐activated state‐of‐the‐art Fe─N─C catalyst has demonstrated a peak power density of 1.1 W cm−2 for PEMFC and remarkably increased long‐term durability for ORR. The substantially improved performance can be attributed to the formation of highly active ketone‐decorated (edge‐hosted) FeN4 sites and substantially boosts coupled proton−electron transfer (CPET) by improving the conductivity of the as‐synthesized Fe─N─C with an interpenetrating network structure. The interconnected micro‐nodes within the interpenetrating network are the main active regions for the ORR, evidenced by an optimized structural model based on the above typical morphology. Therefore, this finding provides an innovative and facile idea for solving the activity and stability deficiency for promising Fe─N─C for commercial PEMFC.

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Iron and tin phosphide as polymer electrolyte membrane fuel cell cathode catalysts

Sapkota

Aguey‐Zinsou

2023

International Journal of Hydrogen Energy

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Doping oxygen triggered electrocatalytic activity of carbon interpenetrating networks in acid electrolyte

Cited by 3 publications

References 59 publications

Trace Tungsten Microalloying PtCuCo Medium Entropy Alloys: Substructure Reconstruction‐Triggered High‐Performance for PEMFC

Trace Tungsten Microalloying PtCuCo Medium Entropy Alloys: Substructure Reconstruction‐Triggered High‐Performance for PEMFC

Applied Voltage‐Activated Fe─N─C Catalysts for Pem Fuel Cells

Iron and tin phosphide as polymer electrolyte membrane fuel cell cathode catalysts

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