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25 Aug 06:52

Porous Hollow-Structured LaNiO3 Stabilized N,S-Codoped Graphene as an Active Electrocatalyst for Oxygen Reduction Reaction

by Tran Duy Thanh, Nguyen Dinh Chuong, Jayaraman Balamurugan, Hoa Van Hien, Nam Hoon Kim, Joong Hee Lee


A nanohybrid based on porous and hollow interior structured LaNiO3 stabilized nitrogen and sulfur codoped graphene (LaNiO3/N,S-Gr) is successfully synthesized for the first time. Such a nanohybrid as an electrocatalyst shows high catalytic activity for oxygen reduction reaction (ORR) in O2-saturated 0.1 m KOH media. In addition, it demonstrates a comparable catalytic activity, longer working stability, and much better alcohol tolerance compared with commercial Pt/C behavior in same experiment condition. The obtained results are attributed to synergistic effects from the enhanced electrocatalytic active sites on the rich pore channels of porous hollow-structured LaNiO3 spheres and heteroatom doped efficiency on graphene structure. In addition, N,S-Gr can meritoriously stabilize monodispersion of the LaNiO3 spheres, and act as medium bridging for high electrical conductivity, thereby providing large active surface area for O2 adsorption, accelerating reduction reaction, and improving electrochemical stability. Such a hybrid opens an interesting class of highly efficient non-Pt catalysts for ORR in alkaline media.

Thumbnail image of graphical abstract

An efficient nanohybrid based on N and S codoped graphene-stabilized porous hollow-structured LaNiO3 nanocatalysts is successfully developed for the first time. Such a nanohybrid demonstrates comparable electrocatalytic activity, better working durability, and higher methanol and ethanol tolerance compared with commercial Pt/C for oxygen reduction reaction.

10 Nov 15:48

Design Principles for High H2 Storage Using Chelation of Abundant Transition Metals in Covalent Organic Frameworks for 0–700 bar at 298 K

by Yohanes Pramudya and Jose L. Mendoza-Cortes

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.6b08803
05 Nov 07:25

Mesoporous carbon nitrides: synthesis, functionalization, and applications

Chem. Soc. Rev., 2016, Advance Article
DOI: 10.1039/C6CS00532B, Review Article
Kripal S. Lakhi, Dae-Hwan Park, Khalid Al-Bahily, Wangsoo Cha, Balasubramanian Viswanathan, Jin-Ho Choy, Ajayan Vinu
Mesoporous carbon nitrides (MCNs) with large surface areas and tuneable pore diameters are unique semiconducting materials and exhibit excellent physicochemical properties, which promote their application in diverse fields including photocatalysis, sensing, and energy storage and conversion.
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23 Jun 11:53

Now we NO

Nature Chemistry 8, 635 (2016). doi:10.1038/nchem.2562

Nitric oxide (NO) is an important signalling molecule in biological systems, but it is unclear exactly how it interacts with some metalloproteins. Now, a collection of articles in this issue reveal how NO binds to proteins containing type-1 copper sites.