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Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells
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Vertically Aligned Porous Organic Semiconductor Nanorod Array Photoanodes for Efficient Charge Utilization.

Beidou Guo1,2, Liangqiu Tian1,2, Wenjing Xie1

  • 1Chinese Academy of Sciences (CAS) Key Laboratory of Nanosystem and Hierarchy Fabrication, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , People's Republic of China.

Nano Letters
|August 14, 2018
PubMed
Summary

This study introduces a novel nanostructured graphitic carbon nitride (g-CN) porous nanorod array for efficient photoelectrochemical water splitting. The new material significantly enhances charge utilization and solar energy conversion in organic polymer photoanodes.

Keywords:
Charge separationexciton dissociationgraphitic carbon nitridephotoanodeporous nanorod arraysolar water splitting

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Organic polymer photoelectrochemical water splitting is limited by inefficient charge utilization and high exciton binding energy.
  • Localized π-electron conjugation in polymers hinders charge carrier mobility and separation.

Purpose of the Study:

  • To develop a novel photoanode for enhanced photoelectrochemical water splitting using nanostructured graphitic carbon nitride (g-CN).
  • To investigate the structure-property relationships governing the improved performance of the nanostructured g-CN material.

Main Methods:

  • In situ synthesis of vertically aligned g-CN porous nanorod (PNR) arrays using thermal polycondensation with anodic aluminum oxide as a template.
  • Photoelectrochemical measurements including photocurrent density and incident photon-to-current efficiency.
  • Stability testing in aqueous electrolyte solutions.

Main Results:

  • The g-CN PNR array achieved a photocurrent density of 120.5 μA cm⁻² at 1.23 VRHE under one sun illumination.
  • A record incident photon-to-current efficiency of approximately 15% at 360 nm was observed.
  • Outstanding stability in oxygen evolution reactions was demonstrated, outperforming planar counterparts.

Conclusions:

  • The nanostructured g-CN PNR array significantly improves charge carrier mobility, exciton dissociation, and electron transport pathways.
  • This work presents a new strategy for developing high-performance organic semiconductor photoanodes for solar energy conversion.