Palladium and platinum single atom catalysts supported on C@C3N4 with distinctive electrochemical performance = C@C3N4 담지체를 이용한 팔라듐과 백금 단일 원자 촉매의 독특한 전기화학 반응 성능

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Single atom catalysts (SACs) maximize utilization of noble metal whereas nanoparticle catalysts leave behind inner noble metal molecules intact. In this study, palladium and platinum are supported on $C@C_3N_4$ to synthesize $C@C_3N_4$ – $Pd_1$ and $C@C_3N_4$ - $Pt_1$ catalysts. Single atomic structure is confirmed by high angle annular dark field scanning tunneling electron microscopy (HAADF-STEM) image, and extended X-ray absorption fine structure (EXAFS) analysis. Electrochemical tests including cyclic voltammetry (CV) in the range of 0.05 – 1.1 V (vs. RHE) and oxygen reduction reaction (ORR) are conducted. Lack of ensemble sites in SACs results in two-electron pathway for ORR and shows high $H_2O_2$ selectivity of up to 93% for $C@C_3N_4$ – 0.5%Pd. DFT calculation is adopted to verify the source for high $H_2O_2$ selectivity. Herein, electrochemical performance and contribution of SACs in hydrogen evolution reaction (HER), hydrogen oxidation reaction (HOR), formic acid oxidation reaction (FAOR) and methanol oxidation reaction (MOR) are also reported. This comprehensive study is expected to give insight into single atomic nature and foster development of single atom electrocatalysts.
Advisors
Lee, Hyunjooresearcher이현주researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2019.2,[iv, 32 p. :]

Keywords

single atom catalyst▼aelectrocatalyst▼aN doped carbon▼agraphitic carbon nitride▼aoxygen reduction reaction; 단일 원자 촉매▼a전기화학 촉매▼a질소 도핑된 탄소▼a그래파이트 탄소 질화물▼a산소 환원 반응

URI
http://hdl.handle.net/10203/266368
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843730&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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