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Graphene-coated copper nanowire networks as a highly stable transparent electrode in harsh environments toward efficient electrocatalytic hydrogen evolution reactions

Manikandan, Arumugam, Lee, Ling, Wang, Yi-Chung, Chen, Chia-Wei, Chen, Yu-Ze, Medina, Henry, Tseng, Jiun-Yi, Wang, Zhiming M., Chueh, Yu-Lun
Journal of materials chemistry A 2017 v.5 no.26 pp. 13320-13328
annealing, antioxidants, catalysts, copper, copper nanoparticles, electrodes, graphene, hydrogen production, indium, nanowires, oxygen, photocatalysis, seawater, temperature, transmittance, vapors
Copper nanowire networks (NWs) coated with a graphene layer through a carbon-enclosed chemical vapor deposition technique at a low temperature of 400 °C with a low sheet resistance of 23.2 Ω sq⁻¹ and a high transmittance of 83.4%, which is comparable to the typical values of tin-doped indium oxide (ITO), as a transparent conducting electrode were demonstrated. The graphene-coated copper NW networks retain a low sheet resistance of less than 25 Ω sq⁻¹ even after annealing at a temperature of 240 °C in a pure oxygen environment for 1 h, while a sheet resistance less than 100 Ω sq⁻¹ can still be maintained in natural sea water, and acidic and basic solutions. Their highly stable features in harsh environments make these graphene-coated copper nanowire networks suitable as a catalyst toward high-efficiency hydrogen evolution reactions (HERs) with a low overpotential of 252 mV at 10 mA Cm⁻² and a low Tafel slope of 67 mV dec⁻¹. The non-corrosive and anti-oxidant graphene-coated copper nanowire networks could be used as an alternative transparent conducting electrode in harsh environments, such as in tandem photocatalytic water splitting.