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| Type |
Poster Presentation |
| Area |
Electrochemistry |
| Room No. |
Grand Ballroom |
| Time |
10월 19일 (금요일) 11:00~12:30 |
| Code |
ELEC.P-458 |
| Subject |
Efficient electrocatalysis to water dissociation via chemical strain formation through anion substitution in ternary transition metal chalcogenides |
| Authors |
Anand prakash Tiwari
Material science and engineering, Korea Advanced Institute of Science and Technology, Korea |
| Abstract |
To date, researchers have revealed that the electrocatalytic activity can be improved by the creation of defects in the crystal lattice of 2-dimensional layered, transition metal chalcogenides (TMCs) such as MoS2 or Cu2MoS4, respectively. However, the role of anion substitution for the enhancement of overall electrocatalytic activity in the ternary TMCs (TTMC) remains unproven. Here, we show the substitution of anion atom sulfur (S) with selenium (Se) in a new electrocatalyst Cu2WS4 for efficient hydrogen evolution reaction (HER) activity. The higher electrocatalytic activity of Cu2WS4 after anion atom substitution can be attributed to the creation of chemical strain in the lattice, which causes an increase of active sites for hydrogen adsorption and desorption. Experimentally, the anion substituted Cu2W(SySe1-y)4 sample shows superior electrocatalytic activities with low onset potential of 0.320 V at 10 mA/cm2 for HER, which is two-fold lower than the pristine Cu2WS4 (0.650 V at 10 mA/cm2 ) sample. In addition, after 1,000 cycles with continuous electrolysis in an acid electrolyte for 12 h, the anion substituted samples Cu2W(SySe1-y)4 preserves its structure and robust catalytic activity perfectly. As a result, our work demonstrates a new approach for the developments of real applications of TMCs in energy conversion. |
| E-mail |
anand@kaist.ac.kr |
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122nd General Meeting of the KCS