01861nas a2200181   4500008004100000022001400041245013300055210006900188260009000257300000900347490000600356520108400362100002901446700002401475700003001499700002501529856012501554       2014                        eng d  a2045-232200aC@SiNW/TiO2 core-shell nanoarrays with sandwiched carbon passivation layer as high efficiency photoelectrode for water splitting0 aCSiNWTiO2 coreshell nanoarrays with sandwiched carbon passivatio  aMACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLANDbNATURE PUBLISHING GROUPcMAY  a48970 v43 a<p>One-dimensional heterostructure nanoarrays are efficiently promising as high performance electrodes for photo electrochemical (PEC) water splitting applications, wherein it is highly desirable for the electrode to have a broad light absorption, efficient charge separation and redox properties as well as defect free surface with high area suitable for fast interfacial charge transfer. We present highly active and unique photoelectrode for solar H-2 production, consisting of silicon nanowires (SiNWs)/TiO2 core-shell structures. SiNWs are passivated to reduce defect sites and protected against oxidation in air or water by forming very thin carbon layer sandwiched between SiNW and TiO2 surfaces. This carbon layer decreases recombination rates and also enhances the interfacial charge transfer between the silicon and TiO2. A systematic investigation of the role of SiNW length and TiO2 thickness on photocurrent reveals enhanced photocurrent density up to 5.97 mA/cm(2) at 1.0 V vs. NHE by using C@SiNW/TiO2 nanoarrays with photo electrochemical efficiency of 1.17%.</p>1 aDevarapalli, Rami, Reddy1 aDebgupta, Joyashish1 aPillai, Vijayamohanan, K.1 aShelke, Manjusha, V.  uhttps://library.ncl.res.in/content/csinwtio2-core-shell-nanoarrays-sandwiched-carbon-passivation-layer-high-efficiency-0