Hollow hierarchical zinc cobalt sulfides derived from bimetallic-organic-framework as a non-precious electrocatalyst for oxygen reduction reaction
| Autor: | Dongwook Lim, Hyung Chul Ham, Kyeongseok Min, Geon-Joong Kim, Minji Hwang, Sung-Hyeon Baeck |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Sulfide 010405 organic chemistry Process Chemistry and Technology chemistry.chemical_element Zinc 010402 general chemistry Electrocatalyst 01 natural sciences Cobalt sulfide Sulfur Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Thiourea Chemical engineering Physical and Theoretical Chemistry Cobalt |
| Zdroj: | Molecular Catalysis. 509:111614 |
| ISSN: | 2468-8231 |
| Popis: | Herein, pyrolysis strategy assisted by a dual-metal-ZIF is developed to synthesize porous zinc cobalt sulfide supported on nitrogen and sulfur co-doped carbon (Zn-Co-S@NSC). A dodecahedral ZIF architecture is first constructed with two metal sources, followed by a pyrolysis process with thiourea to obtain hollow composite materials consisting of Zn-Co sulfide uniformly dispersed on nitrogen and sulfur co-doped carbon. Benefitting from the distinctive structure and synergistic effect of the binary metal system, the as-prepared Zn-Co-S@NSC displays excellent electrocatalytic performance on ORR in alkaline condition. The superior performances, which are evaluated in terms of onset-potential (0.955 V vs. RHE) and half-wave potential (0.831 V vs. RHE), are comparable to the conventional Pt/C catalyst. In addition, Zn-Co-S@NSC exhibits remarkable electrochemical durability and exceptional methanol tolerance compared to the commercial Pt/C. The DFT calculations further demonstrate that the binary metal system can promote electrocatalytic activity by optimizing the reaction free energy for intermediates of ORR. |
| Databáze: | OpenAIRE |
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