Ultra Long Copper Nanowire Coated with Graphene as Highly Transparent Conducting Electrode and Efficient Catalyst for Hydrogen Evolution Reaction
Arumugam Manikandan1*, Ling Lee1, Yi-Chung Wang1, Yu-Ze Chen1, Henry Medina1, Jiun-Yi Tseng1,2, Yu-Lun Chueh1
1Department of Material Science and Engineering, National Tsing Hua University, Hsinchu City, Taiwan
2Graduate school of Material Science, National Yunllin University of Science and Technology, Yunlin, Taiwan
* presenting author:Manikandan Arumugam, email:mani111nano@gmail.com
We developed a high stable, non-corrosive, high oxidation resistive transparent conducting electrode based on copper nanowire coated with graphene, but also a superior performance in the operating hydrogen evolution reactions (HER). Based on our designed carbon-enclosed chemical vapor deposition technique, the conformal graphene coating was achieved at a low temperature of 400 °C with a low sheet resistance of 23.2 Ω/sq at a transmittance of 83.4 % measured in the normal condition, which is comparable to the typical values of tin doped indium oxide (ITO). A low sheet resistance of < 20 Ω/sq is retained after 1 hours at 240 oC in oxygen ambient, and that less than 200 Ω/sq is still observed in the natural sea water, the acidic and basic solutions,which proves the stability of our TCE. Based on the highly stabile feature, which is superior to that of ITO, the graphene coated Cu nanowires exhibit a high efficient ability as a catalyst for HER working in the acidic electrolyte and result in a low overpotential of 252 mV at 10 mA/Cm2 and a low Tafel slope of 67 mV/dec. We anticipate that the non-corrosive and anti-oxidant graphene coated copper nanowires could be used as an alternative transparent conducting electrode in all optoelectronic devices.

Keywords: Copper Nanowire, Transparent Conducting Electrode, Graphene, Low temperature, Hydrogen Evolution Reaction