Hydrogen-substituted graphdiyne encapsulated cuprous oxide photocathode for efficient and stable photoelectrochemical water reduction

Photoelectrochemical (PEC) water splitting is an appealing approach for green hydrogen generation. The natural p-type semiconductor of Cu2O is one of the most promising photocathode candidates for direct hydrogen generation. However, the Cu2O-based photocathodes still suffer severe self-photo-corrosion and fast surface electron-hole recombination issues. Herein, we propose a facile in-situ encapsulation strategy to protect Cu2O with hydrogen-substituted graphdiyne (HsGDY) and promote water reduction performance. The HsGDY encapsulated Cu2O nanowires (HsGDY@Cu(2)ONWs) photocathode demonstrates a high photocurrent density of -12.88mA cm(-2) at 0 V versus the reversible hydrogen electrode under 1 sun illumination, approaching to the theoretical value of Cu2O. The HsGDY@Cu2O NWs photocathode as well as presents excellent stability and contributes an impressive hydrogen generation rate of 218.2 +/- 11.3 mu mol h(-1)cm(-2), which value has been further magnified to 861.1 +/- 24.8 mu mol h(-1)cm(-2) under illumination of concentrated solar light. The in-situ encapsulation strategy opens an avenue for rational design photocathodes for efficient and stable PEC water reduction.

Automated summary

This study proposes a facile in-situ encapsulation strategy using HsGDY to protect Cu2O and enhance water reduction performance. The HsGDY@Cu2O NWs photocathode demonstrates high photocurrent density, excellent stability, and impressive hydrogen generation rate.