02350nas a2200241   4500008004100000022001400041245013100055210006900186260007100255300001400326490000600340520141500346653003301761653001901794653002001813653002601833653003001859653002401889653001901913100002401932700002401956856012801980       2015                        eng d  a2155-543500aCu-Pt nanocage with 3-D electrocatalytic surface as an efficient oxygen reduction electrocatalyst for a primary Zn-air battery0 aCuPt nanocage with 3D electrocatalytic surface as an efficient o  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR  a1445-14520 v53 a<p>Cu-Pt nanocage (CuPt-NC) intermetallic structures have been prepared by an in situ galvanic displacement reaction. The structures are found to be well organized within the framework demarcated with distinguishing arms, having clear edges and corners with a size of similar to 20 nm. The unique nanocage structure possessing large specific surface area and better structural integrity helps to achieve improved electrochemical oxygen reduction reaction activity and stability in alkaline solution in comparison to the commercially available 20 wt % Pt/C. CuPt-NC shows 50 mV positive onset potential shift with significantly higher limiting current in comparison to Pt/C. Interestingly, CuPt-NC has shown 2.9- and 2.5-fold improved mass activity and specific activity, respectively, for ORR at 0.9 V vs RHE in comparison to Pt/C. Moreover, the stability of CuPt-NC has been tested by an accelerated durability test under alkaline conditions. CuPt-NC has been subsequently utilized as the air electrode in a primary Zn-air battery and is found to possess 1.30- and 1.34-fold improved power density and current density at 1 V, respectively, in comparison to the state-of-the-art Pt/C catalyst. In addition, CuPt-NC has shown several hours of constant discharge stability at 20 mA cm(-2) with a specific capacity of 560 mAh gZn(-1) and energy density of 728 Wh kgZn(-1) in the primary Zn-air battery system.</p>10a3-D electrocatalytic surface10aCu-Pt nanocage10aelectrocatalyst10agalvanic displacement10aoxygen reduction reaction10asolvothermal method10aZn-air battery1 aDhavale, Vishal, M.1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/cu-pt-nanocage-3-d-electrocatalytic-surface-efficient-oxygen-reduction-electrocatalyst-002716nas a2200229   4500008004100000022001400041245017200055210006900227260007100296300001600367490000600383520177500389653002002164653001702184653003002201653003402231653002302265100002302288700002402311700002402335856012702359       2015                        eng d  a1944-824400aSurface-tuned Co3O4 nanoparticles dispersed on nitrogen-doped graphene as an efficient cathode electrocatalyst for mechanical rechargeable zinc-air battery application0 aSurfacetuned Co3O4 nanoparticles dispersed on nitrogendoped grap  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP  a21138-211490 v73 a<p>The most vital component of the fuel cells and metal air batteries is the electrocatalyst, which can facilitate the oxygen reduction reaction (ORR) at a significantly reduced overpotential. The present work deals with the development of surface-tuned cobalt oxide (Co3O4) nanoparticles dispersed on nitrogen-doped graphene as a potential ORR electrocatalyst possessing some unique advantages. The thermally reduced nitrogen-doped graphene (NGr) was decorated with three different morphologies of Co3O4 nanoparticles, viz., cubic, blunt edged cubic, and spherical, by using a simple hydrothermal method. We found that the spherical Co3O4 nanoparticle supported NGr catalyst (Co3O4-SP/NGr-24h) has acquired a significant activity makeover to display the ORR activity closely matching with the state-of-the-art Pt supported carbon (PtC) catalyst in alkaline medium. Subsequently, the Co3O4-SP/NGr-24h catalyst has been utilized as the air electrode in a Zn-air battery, which was found to show comparable performance to the system derived from PtC. Co3O4-SP/NGr-24h catalyst has shown several hours of flat discharge profile at the discharge rates of 10, 20, and 50 mA/cm(2) with a specific capacity and energy density of similar to 590 mAh/g(-zn) and,840 Wh/kg(-zn), respectively, in the primary Zn-air battery system. In conjunction, Co3O4-SP/NGr-24h has outperformed as an air electrode in mechanical rechargeable Zn-air battery as well, which has shown consistent flat discharge profile with minimal voltage loss at a discharge rate of 50 mA/cm(2). The present results, thus demonstrate that the proper combination of the tuned morphology of Co3O4 with NGr will be a promising and inexpensive material for efficient and ecofriendly cathodes for Zn-air batteries.</p>10aelectrocatalyst10amixed facets10aoxygen reduction reaction10arechargeable zinc-air battery10asurface morphology1 aSingh, Santosh, K.1 aDhavale, Vishal, M.1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/surface-tuned-co3o4-nanoparticles-dispersed-nitrogen-doped-graphene-efficient-cathode-0