4‐Nitrophenol Reduction by a Single Platinum Palladium Nanocube Caged within a Nitrogen‐Doped Hollow Carbon Nanosphere. Issue 6 (16th February 2017)

• Record Type: Journal Article
• Authors: Zhang, Chunmei; Zhang, Ruizhong; He, Shuijian; Li, Lei; Wang, Xiaodan; Liu, Minmin; Chen, Wei
• Is Part Of: ChemCatChem. Volume 9:Issue 6(2017)
• Page Start: 980
• Page End: 986
• Publication Date: 2017-02-16
• Subjects: carbon -- nanoparticles -- palladium -- platinum -- reduction; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201601364
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: The improvement of the utilization efficiency and the enhancement of the catalytic activity and stability of precious‐metal‐based nanocatalysts is a hot topic in the field of catalysis. In the present study, a single‐nanoparticle catalyst with a high stability is realized by confining a single surface‐cleaned PtPd alloy nanocube within a N‐doped hollow carbon nanosphere (PtPd@N‐HCS). The microporous carbon shell makes the encaged PtPd nanocube accessible to the reacting molecules. Compared with PtPd nanocubes protected by polyvinylpyrrolidone (PVP‐PtPd) and N‐doped carbon spheres, PtPd@N‐HCS exhibited a better catalytic performance towards 4‐nitrophenol reduction. Under the catalysis of PtPd@N‐HCS, 4‐nitrophenol can be reduced completely to 4‐aminophenol (100 %) in 2 min; however, only 50 and 20 % of 4‐nitrophenol was degraded in 2 min with PVP‐PtPd and N‐HCS as catalysts. Moreover, as a result of the confinement of PtPd nanocubes in hollow nanospheres, PtPd@N‐HCS showed a high catalytic stability with 100 % conversion maintained over at least four cycles. Abstract : Caged catalyst : The degradation of 4‐nitrophenol is realized by a single surface‐cleaned PtPd alloy nanocube caged within a nitrogen‐doped hollow carbon nanosphere. The carbon‐shell‐covered PtPd nanocube can catalyze the complete conversion of 4‐nitrophenol in 2 min. Furthermore, the single‐nanoparticle catalyst showed a high catalytic stability with 100 % conversion after at least four cycles.