期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 844, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156160
关键词
Oxygen reduction reaction; Heterogeneous; Nanocatalysts; Wet chemical reduction method; Ir-clusters
资金
- Ministry of Science and Technology, Taiwan [MOST 107-2221-E-027-009-MY2, MOST 108-2321-B-010-008-MY2, MOST 106-2112-M-007-016-MY3, MOST 108-3116-F-007-001, MOST 107-3017-F-006-003, MOST 109-3116-F-007-001-]
- Ministry of Education
- Precision Research and Analysis Center at NTUT
With proper conjunctions between inter/intra-particle domains, the activity and durability of heterogeneous nanocatalysts (NCs) can be substantially improved by more than an order. In this study, trimetallic NCs comprising an Ir-clusters decorated unconformable Pd-shell over amorphous NiOx core crystal underneath (namely NPI) are developed for oxygen reduction reaction (ORR) in alkaline medium (0.1 M KOH). Results for NPI NCs with different extents of Ir decoration (1 and 14 wt%) are compared for clarifying the configuration effects corresponding to ORR performance. For the optimum case with an Ir loading of similar to 1.0 wt%, the mass activity (MA) is 2066.8 mAmg(-1). This value is similar to 31-folds increased as compared to that of commercial J.M.-Pt/C catalyst (20 wt% Pt) at 0.85 V vs RHE (67.1 mA mg(-1)). Moreover, as prepared NPI-0025 NC exhibits nearly 100% stability when operated up to 21 k accelerated degradation test (ADT) cycles. By cross-referencing results of physical structure inspections and electrochemical analysis, we reveal that such a high ORR performance could be attributed to the incorporation of Ir atoms in defect sites of Ni-Pd interfaces. These Ir atoms facilitate the O-2 splitting by electronegativity differences to the adjacent sites, therefore, improves the ORR performance of NPI NCs. (c) 2020 Elsevier B.V. All rights reserved.
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