An Enhanced‐Activity and High‐Stability PtCo/N‐Doped Carbon Skeleton Electrocatalyst Derived from UA‐ZIF‐67 Template for Methanol Oxidation. Issue 27 (19th July 2021)

• Record Type: Journal Article
• Authors: He, Fan; Li, Kanshe; Cong, Shaoling; Yuan, Hua; Wu, Changqing; Wang, Xiaoqin; Wu, Bohua; Xiong, Shanxin; Wu, Yan; Zhou, Anning
• Is Part Of: ChemistrySelect. Volume 6:Issue 27(2021)
• Page Start: 6973
• Page End: 6985
• Publication Date: 2021-07-19
• Subjects: Electrochemistry -- Fuel cells -- PtCo nanoparticles -- Ulmic acid -- ZIF-67; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202101776
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: To improve electrocatalytic performances of Pt‐based catalysts toward methanol oxidation reaction (MOR) and reduce the consumption of Pt, we report a novel strategy for preparing a PtCo/NCS catalyst with bimetallic PtCo nanoparticles supported on the nitrogen‐doped carbon skeleton (NCS) derived from ulmic‐acid ‐based ZIF‐67 (UA‐ZIF‐67) template. The synthesized optimal NCS has rich mesoporous structure with a BET specific surface area of 451 m 2 g −1 and average pore diameterof 4.5 nm, possesses graphitic structure containing some CNTs and many graphene layers, and is doped by 8.16 at% nitrogen in the form of pyridine N and pyrrole N. In the optimum PtCo/NCS, metallic Pt and Co nanoparticles with an average size of 3.0±0.5 nm are uniformly supported on the NCS. This PtCo/NCS catalyst shows a high electrocatalytic activity and stability for MOR due to its high electrochemically active specific surface area (ECSA) value, current density, steady‐state current and current retention. The results are attributed to small highly‐dispersed PtCo nanoparticles with good synergistic effects of bimetallic active components supported on the NCS possessing CNTs and graphene layers, suitable nitrogen doping and well‐matched hierarchical pore structure.These findings will provide a new insight in designing and synthesizing high‐performance electrocatalysts. Abstract : We report a novel strategy for preparing a PtCo/NCS catalyst with bimetallic PtCo nanoparticles supported on the nitrogen‐doped carbon skeleton (NCS) derived from ulmic‐acid‐based ZIF‐67 (UA‐ZIF‐67) template. The synthesized optimal NCS has rich mesoporous structure, graphitic structure containing some CNTs and many graphene layers, and high nitrogen‐doping dosage. In the optimum PtCo/NCS, metallic Pt and Co nanoparticles are uniformly supported on the NCS. This PtCo/NCS catalyst shows a high electrocatalytic activity and stability for MOR.