Energy application of 2D materials

• Main Authors: Hsu, Chang-Lung, 許昌隆
• Other Authors: Wei, Kung-Hwa
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/96120010750361798132

博士 === 國立交通大學 === 材料科學與工程學系所 === 102 === The objective of this thesis is developing 2D material such as graphene and molybdenum sulfide in solar cell or hydrogen production energy application. Large-area graphene films were synthesized on copper foil by atmospheric chemical vapor deposition using argon, hydrogen and methane. Layer-by-layer molecular doping process on graphene formed sandwiched graphene/tetracyanoquinodimethane (TCNQ)/graphene stacked films for polymer solar cell anodes, where the TCNQmolecules (as p-dopants) were securely embedded between two graphene layers. The P3HT/PCBM device with an anode structure composed of two TCNQ layers sandwiched by three CVD grapheme layers shows optimum PCE (∼2.58%); Large-area graphene films were also synthesized on nickel foam by atmospheric chemical vapor deposition using argon, hydrogen and methane. The graphene films provide robust protection and efficiently increase stability of the nickel foam in acid. This artificial structure is conductive, low cost, with high surface area, and it is ideal to be used as a template to host MoSx catalysts for increasing the number of reaction sites.MoSx catalytic species were likely related to the bridging S22- or apical S2- for electrocatalytic hydrogen evolution reaction (HER); MoSx materials have been considered as cheap and promising catalysts for HER. The addition of NbCl5 in the precursor solution is able to enhance the HER efficiency of obtained MoSx catalysts. Noticeably, the inclusion of only 1 wt% NbCl5 in the MoSx catalysts results in a 100% iii enhancement in exchange current density and a lowering of the Tafel slope to 46 mV/dec.