4.8 Article

N-doped graphene quantum sheets on silicon nanowire photocathodes for hydrogen production

期刊

ENERGY & ENVIRONMENTAL SCIENCE
卷 8, 期 4, 页码 1329-1338

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ee03607g

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资金

  1. Basic Science Research Program [2011-0011225, 2011-0017587, 2012M3A7B4049807]
  2. Global Frontier R&D Program of the Center for Multiscale Energy System [2011-0031574]
  3. Global Research Lab (GRL) Program [2011-0021972]
  4. Fusion Research Program for Green Technologies through the National Research Foundation of Korea - Ministry of Science, ICT Future, Korea [2012M3C1A1048863]
  5. Ministry of Science, ICT & Future, through the Research Institute of Advanced Materials (RIAM)

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Photoelectrochemical hydrogen production from solar energy has been attractingmuch attention in the field of renewable energy technology. The realization of cost-effective hydrogen production by water splitting requires electrolysis or photoelectrochemical cells decorated with highly efficient co-catalysts. A critical requirement for catalysts in photoelectrochemical cells is not only the ability to boost the kinetics of a chemical reaction but also to exhibit durability against electrochemical and photoinduced degradation. In the race to replace previous noble-metal catalysts, the design of carbon-based catalysts represents an important research direction in the search for non-precious, environmentally benign, and corrosion-resistant catalysts. Herein, we suggest graphene quantum sheets as a catalyst for the solar-driven hydrogen evolution reaction on Si nanowire photocathodes. The optimum nanostructures of the Si photocathodes exhibit an enhanced photocurrent and a lower overpotential compared to those of a planar Si surface. This significant enhancement demonstrates how graphene quantum sheet catalysts can be used to produce Si nanowire photocathodes as hydrogen evolution reaction catalysts with high activity.

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