High-efficiency unbiased water splitting with photoanodes harnessing polycarbazole hole transport layers

The construction of uniform heterojunctions for effective hole transport in a nanoporous BiVO 4 photoanode is highly challenging, despite its promise for unbiased photoelectrochemical (PEC) water splitting. Herein, we grew a nanoscale conjugated polycarbazole framework (CPF-TCB) on nanoporous Mo:BiV...

Full description

Saved in:
Bibliographic Details
Published in:Energy & environmental science 2024-04, Vol.17 (7), p.2541-2553
Main Authors: Yang, Jin Wook, Ji, Su Geun, Jeong, Chang-Seop, Kim, Jaehyun, Kwon, Hee Ryeong, Lee, Tae Hyung, Lee, Sol A, Cheon, Woo Seok, Lee, Seokju, Lee, Hyungsoo, Kwon, Min Sang, Moon, Jooho, Kim, Jin Young, Jang, Ho Won
Format: Article
Language:English
Subjects:
Bismuth oxides
Heterojunctions
Heterostructures
Hydrogen
Hydrogen production
Oxidation
Perovskites
Photoanodes
Photocathodes
Photoelectric effect
Photovoltaic cells
Solar cells
Solar energy
Vanadates
Water splitting
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The construction of uniform heterojunctions for effective hole transport in a nanoporous BiVO 4 photoanode is highly challenging, despite its promise for unbiased photoelectrochemical (PEC) water splitting. Herein, we grew a nanoscale conjugated polycarbazole framework (CPF-TCB) on nanoporous Mo:BiVO 4 and exhaustively assessed its hole extraction capability. Type II band alignment in the CPF-TCB/Mo:BiVO 4 heterostructure enabled effective hole transport by suppressing charge recombination, enhancing both the fill factor and stability of the photoanode after loading a cocatalyst. The NiFeCoO x /CPF-TCB/Mo:BiVO 4 photoanode generates a superlative water oxidation photocurrent density of 6.66 mA cm −2 at 1.23 V versus the reversible hydrogen electrode. By combining the photoanode with a perovskite photocathode and a perovskite/Si solar cell, two types of PEC tandem devices exhibit solar-to-hydrogen conversion efficiencies of 6.75% and 9.02%, which are the topmost records under tandem illumination mode. This work provides a significant step for designing high-performance organic-inorganic hybrid photoelectrodes for solar hydrogen production. The conformal heterojunction of a competent hole transport layer onto the nanoporous BiVO 4 photoanode is highly challenging, despite its promise for unbiased photoelectrochemical (PEC) water splitting.
ISSN:1754-5692
1754-5706
DOI:10.1039/d3ee03353h