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Volume 7
Innovative Energy & Research
ISSN: 2576-1463
Advanced Energy Materials 2018
August 13-14, 2018
Page 42
conference
series
.com
August 13-14, 2018 | Dublin, Ireland
20
th
International Conference on
Advanced Energy Materials and Research
Hyoyoung Lee, Innov Ener Res 2018, Volume 7
DOI: 10.4172/2576-1463-C1-001
Controlling energy bandgap of semiconducting materials for energy and environment
A
control of the energy bandgap of semicondunding metarials including transtion metal chalcogenides (TMCs) including
TiO
2
, MoS
2
and CoS
2
have been paid attention for energy conversion and environmental issues. Herein, we like to introduce
new findings about the visible-light driven blue TiO
2
materials for photo-catalytic hydrogen evolving reaction (HER) and for
an application to remove algae from water.
1,2
In addition, we like to report new layered ternary transition metal chalcogenides
(TTMCs) material to overcome to the limitation of active sites which is challenging in binary transition metal chalcogenides
(BTMC) such as MoS
2
towards electrochemical hydrogen production. The TTMC, Cu
2
MoS
4
has been successfully synthesized by
a facile solution-processed method. Moreover, by anion doping such as Se in as the synthesized Cu
2
MoS
4
, it has been found that
TTMC can be exfoliated into single layer nanosheets and the single layered TTMC exhibits the highest electrocatalytic activity
towards HER.
3
We also report an advanced bi-functional hybrid electrocatalyst for both oxygen reduction reaction (ORR) and
oxygen evolution reaction (OER), which is composed of WS2 and CNT connected via tungsten carbide (WC) bonding. WS2
sheets on the surface of CNTs provide catalytic active sites for electrocatalytic activity while the CNTs act as conduction channels
and provide a large surface area. We found that four to five layers of WS2 sheets on the surface of CNTs produces excellent catalytic
activity towards bothORR andOER, which is comparable to noble metals (Pt, RuO
2
, etc.). Our findings show the many advantages
enabled by designing highly-active, durable, and cost-effective ORR and OER electrocatalysts.
4
Finally, we like to demonstrate
new strategy to satisfy all requirements for the development of a highly active and remarkably durable HER electrocatalyst in both
acidic and alkaline media via anion-cation double substitution into a CoS
2
moiety for preparing 3D mesoporous pyrite-metal
vanadium-cobalt phosphorsulphide (Co
1-x
V
x
SP).
5
Figure 1:
Schematic of solar photo-catalyst.
Recent Publications
1. Kan Zhang, et al. (2016) An order/disorder/water junction system for highly efficient co-catalyst-free photocatalytic
hydrogen generation. Energy & Environmental Science, 9, 499-503.
2. Youngmin Kim, Hee Min Hwang, Luyang Wang, Ikjoon Kim, Yeoheung Yoon and Hyoyoung Lee* (2016) Solar-light
photocatalytic disinfection using crystalline/amorphous low energy bandgap reduced TiO
2
. Scientific Reports, 6, 25212;
doi: 10.1038/srep25212.
Hyoyoung Lee
Sungkyunkwan University, Republic of Korea