High-Performance a-Si/c-Si Heterojunction Photoelectrodes for Photoelectrochemical Oxygen and Hydrogen Evolution

Hsin-Ping Wang; Ke Sun; Sun Young Noh; Alireza Kargar; Meng-Lin Tsai; Ming-Yi Huang; Deli Wang; Jr-Hau He

doi:10.1021/nl5041463

High-Performance a-Si/c-Si Heterojunction Photoelectrodes for Photoelectrochemical Oxygen and Hydrogen Evolution

Hsin-Ping Wang
, Ke Sun
, Sun Young Noh
, Alireza Kargar
, Meng-Lin Tsai
, Ming-Yi Huang
, Deli Wang^*
, Jr-Hau He^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

91 Citations (Scopus)

Abstract

Amorphous Si (a-Si)/crystalline Si (c-Si) heterojunction (SiHJ) can serve as highly efficient and robust photoelectrodes for solar fuel generation. Low carrier recombination in the photoelectrodes leads to high photocurrents and photovoltages. The SiHJ was designed and fabricated into both photoanode and photocathode with high oxygen and hydrogen evolution efficiency, respectively, by simply coating of a thin layer of catalytic materials. The SiHJ photoanode with sol-gel NiO_x as the catalyst shows a current density of 21.48 mA/cm² at the equilibrium water oxidation potential. The SiHJ photocathode with 2 nm sputter-coated Pt catalyst displays excellent hydrogen evolution performance with an onset potential of 0.640 V and a solar to hydrogen conversion efficiency of 13.26%, which is the highest ever reported for Si-based photocathodes.

Original language	English
Pages (from-to)	2817-2824
Journal	Nano Letters
Volume	15
Issue number	5
Online published	9 Feb 2015
DOIs	https://doi.org/10.1021/nl5041463
Publication status	Published - 13 May 2015
Externally published	Yes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Research Keywords

hydrogen evolution
oxygen evolution
Si heterojunction photoelectrodes
solar to hydrogen conversion efficiency
solar to oxygen conversion efficiency

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@article{d21f31aed9e64f63946472eebdb68a1a,

title = "High-Performance a-Si/c-Si Heterojunction Photoelectrodes for Photoelectrochemical Oxygen and Hydrogen Evolution",

abstract = "Amorphous Si (a-Si)/crystalline Si (c-Si) heterojunction (SiHJ) can serve as highly efficient and robust photoelectrodes for solar fuel generation. Low carrier recombination in the photoelectrodes leads to high photocurrents and photovoltages. The SiHJ was designed and fabricated into both photoanode and photocathode with high oxygen and hydrogen evolution efficiency, respectively, by simply coating of a thin layer of catalytic materials. The SiHJ photoanode with sol-gel NiOx as the catalyst shows a current density of 21.48 mA/cm2 at the equilibrium water oxidation potential. The SiHJ photocathode with 2 nm sputter-coated Pt catalyst displays excellent hydrogen evolution performance with an onset potential of 0.640 V and a solar to hydrogen conversion efficiency of 13.26\%, which is the highest ever reported for Si-based photocathodes.",

keywords = "hydrogen evolution, oxygen evolution, Si heterojunction photoelectrodes, solar to hydrogen conversion efficiency, solar to oxygen conversion efficiency",

author = "Hsin-Ping Wang and Ke Sun and Noh, \{Sun Young\} and Alireza Kargar and Meng-Lin Tsai and Ming-Yi Huang and Deli Wang and Jr-Hau He",

year = "2015",

month = may,

day = "13",

doi = "10.1021/nl5041463",

language = "English",

volume = "15",

pages = "2817--2824",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "5",

}

TY - JOUR

T1 - High-Performance a-Si/c-Si Heterojunction Photoelectrodes for Photoelectrochemical Oxygen and Hydrogen Evolution

AU - Wang, Hsin-Ping

AU - Sun, Ke

AU - Noh, Sun Young

AU - Kargar, Alireza

AU - Tsai, Meng-Lin

AU - Huang, Ming-Yi

AU - Wang, Deli

AU - He, Jr-Hau

PY - 2015/5/13

Y1 - 2015/5/13

N2 - Amorphous Si (a-Si)/crystalline Si (c-Si) heterojunction (SiHJ) can serve as highly efficient and robust photoelectrodes for solar fuel generation. Low carrier recombination in the photoelectrodes leads to high photocurrents and photovoltages. The SiHJ was designed and fabricated into both photoanode and photocathode with high oxygen and hydrogen evolution efficiency, respectively, by simply coating of a thin layer of catalytic materials. The SiHJ photoanode with sol-gel NiOx as the catalyst shows a current density of 21.48 mA/cm2 at the equilibrium water oxidation potential. The SiHJ photocathode with 2 nm sputter-coated Pt catalyst displays excellent hydrogen evolution performance with an onset potential of 0.640 V and a solar to hydrogen conversion efficiency of 13.26%, which is the highest ever reported for Si-based photocathodes.

AB - Amorphous Si (a-Si)/crystalline Si (c-Si) heterojunction (SiHJ) can serve as highly efficient and robust photoelectrodes for solar fuel generation. Low carrier recombination in the photoelectrodes leads to high photocurrents and photovoltages. The SiHJ was designed and fabricated into both photoanode and photocathode with high oxygen and hydrogen evolution efficiency, respectively, by simply coating of a thin layer of catalytic materials. The SiHJ photoanode with sol-gel NiOx as the catalyst shows a current density of 21.48 mA/cm2 at the equilibrium water oxidation potential. The SiHJ photocathode with 2 nm sputter-coated Pt catalyst displays excellent hydrogen evolution performance with an onset potential of 0.640 V and a solar to hydrogen conversion efficiency of 13.26%, which is the highest ever reported for Si-based photocathodes.

KW - hydrogen evolution

KW - oxygen evolution

KW - Si heterojunction photoelectrodes

KW - solar to hydrogen conversion efficiency

KW - solar to oxygen conversion efficiency

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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84929193309&origin=recordpage

UR - https://app-overton-io.ezproxy.cityu.edu.hk/articles.php?query=10.1021/nl5041463

U2 - 10.1021/nl5041463

DO - 10.1021/nl5041463

M3 - RGC 21 - Publication in refereed journal

SN - 1530-6984

VL - 15

SP - 2817

EP - 2824

JO - Nano Letters

JF - Nano Letters

IS - 5

ER -

High-Performance a-Si/c-Si Heterojunction Photoelectrodes for Photoelectrochemical Oxygen and Hydrogen Evolution

Abstract

UN SDGs

Research Keywords

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