Acceptor-Doping Accelerated Charge Separation in Cu2 O Photocathode for Photoelectrochemical Water Splitting: Theoretical and Experimental Studies.

Angewandte Chemie
Mengmeng ZhangWenbin Hu

Abstract

Cu2 O is a typical photoelectrocatalyst for sustainable hydrogen production, while the fast charge recombination hinders its further development. Herein, Ni2+ cations have been doped into a Cu2 O lattice (named as Ni-Cu2 O) by a simple hydrothermal method and act as electron traps. Theoretical results predict that the Ni dopants produce an acceptor impurity level and lower the energy barrier of hydrogen evolution. Photoelectrochemical (PEC) measurements demonstrate that Ni-Cu2 O exhibits a photocurrent density of 0.83 mA cm-2 , which is 1.34 times higher than that of Cu2 O. And the photostability has been enhanced by 7.81 times. Moreover, characterizations confirm the enhanced light-harvesting, facilitated charge separation and transfer, prolonged charge lifetime, and increased carrier concentration of Ni-Cu2 O. This work provides deep insight into how acceptor-doping modifies the electronic structure and optimizes the PEC process.

References

May 10, 2011·Nature Materials·Adriana ParacchinoElijah Thimsen
Jul 30, 2011·Journal of the American Chemical Society·Katsuya Iwashina, Akihiko Kudo
Feb 13, 2016·Nano Letters·Jingshan LuoMichael Grätzel

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Citations

Apr 21, 2021·Physical Chemistry Chemical Physics : PCCP·Ellaine Rose A BeronioAllan Abraham B Padama

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