KR102838552B1 - 광전극 반도체 표면에 원자단위의 귀금속 촉매를 광전기화학적 다중 산화-환원 주기로 증착하는 방법 - Google Patents
광전극 반도체 표면에 원자단위의 귀금속 촉매를 광전기화학적 다중 산화-환원 주기로 증착하는 방법Info
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Abstract
Description
도2는 광전극의 구조를 나타낸 이미지이다.
도3은 광전기화학 증착 전위 조건하에서 순환전류전압법에 따른 (a)전류-전압 그래프 및 (b)시간-전류 그래프이고, (c)내지 (f)는 전해질에서 광전극 반도체 상에 백금 촉매의 흡착 및 탈착을 도식화한 이미지이다.
도4는 (a)다중 산화-환원 사이클 수에 따른 수소생산반응의 광전류값을 나타낸 그래프이고, (b)전자빔 증착(EBE), 정전류 광전기화학증착(g-PED), 다중산화/환원 광전기화학증착(rx-PED) 방법으로 백금 촉매를 증착한 수소생산반응의 광전류값을 나타낸 그래프이다.
도5는 (a)Ti 및 (b)Pt에 대하여 X-ray photoelectron spectroscopy (XPS)으로 분석된 피크 강도 데이터를 각 나타낸 그래프이다.
도6은 (a)High-resolution TEM으로 분석된 단일원자 크기의 Pt 촉매 및 (b) EDS로 검출된 TiO2위 Pt 촉매의 원소를 각 분석한 이미지이다.
도7은 (a)전자빔 증착(EBE), 정전류 광전기화학증착(g-PED), 다중산화/환원 광전기화학증착(rx-PED) 방법으로 촉매를 올린 광전극의 수소생산반응 안정성을 조사한 그래프이고, (b)광전극의 파장대별 퀀텀 효율 및 축적된 전류의 IPCE 데이터를 나타낸 그래프이고, (c)Mass activity를 비교한 그래프이고, (d)Turnover frequency 차이를 나타낸 그래프이다.
Claims (13)
- 기판을 준비하는 단계; 및
상기 기판 상에 다중 산화-환원 주기법을 이용하여 원자 단위의 귀금속 촉매를 증착하는 단계를 포함하는 것으로,
상기 귀금속 촉매를 증착하는 단계는,
순환전류전압법으로 수행하여, 상기 귀금속 촉매의 산화 반응 및 환원 반응을 주기적으로 반복시켜 상기 기판 상에 상기 귀금속 촉매를 원자 단위로 증착시키되,
전극에 전류를 인가하면 기판 상 에서 금속 양이온의 흡착과 환원 반응에 따른 핵생성이 진행되고, 전류의 인가를 멈추면 표면 확산과 성장이 진행되어 균일한 금속 나노 입자로 구성된 금속층이 기판 상에 형성될 수 있도록 하는 것을 특징으로 하는 광전기화학적 촉매 증착 방법.
- 제1항에 있어서,
상기 기판은 광전극 반도체인 것을 특징으로 하는 광전기화학적 촉매 증착 방법.
- 제1항에 있어서,
상기 기판을 준비하는 단계는,
기판 상에 광흡수층 반도체층을 형성하는 단계; 및
상기 광흡수층 반도체층 상에 버퍼층 및 표면보호층을 형성하는 단계를 포함하는 것을 특징으로 하는 광전기화학적 촉매 증착 방법.
- 제3항에 있어서,
상기 광흡수층 반도체층을 형성하는 단계는 전기화학 증착법으로 수행하는 것을 특징으로 하는 광전기화학적 촉매 증착 방법.
- 제3항에 있어서,
상기 버퍼층 및 표면보호층을 형성하는 단계는 원자층 증착법으로 수행하는 것을 특징으로 하는 광전기화학적 촉매 증착 방법.
- 삭제
- 제1항에 있어서,
상기 순환전류전압법에서 상기 귀금속 촉매의 산화 반응과 환원 반응이 동시에 일어나는 전압은 0.5 내지 0.1 VAg/AgCl 인 것을 특징으로 하는 광전기화학적 촉매 증착 방법.
- 제1항에 있어서,
상기 귀금속 촉매는 Au, Pd, Ir, Rh, Ru, 및 Pt 로 이루어진 군에서 선택되는 것을 특징으로 하는 광전기화학적 촉매 증착 방법.
- 전도성 기판;
상기 기판 상에 위치하는 광 흡수층 반도체;
상기 광 흡수층 반도체 상에 위치하는 버퍼층 반도체;
상기 버퍼층 반도체 상에 위치하는 표면 보호층 반도체; 및
상기 표면 보호층 반도체 상에 존재하는 원자 단위의 촉매를 포함하고,
상기 촉매는 제1항의 다중 산화-환원 주기법에 따라 증착된 것을 특징으로 하는 광전극.
- 제9항에 있어서,
상기 광 흡수층 반도체는 Cu2O, SnO2, Sb2Se3, Fe2O3, WO3, ZnO, BiVO4, BaSnO3, CuBi2O4, CuFeO2, BaTiO3, FAPbI3 및 MAPbI3 로 이루어진 군에서 선택되는 것을 특징으로 하는 광전극.
- 제9항에 있어서,
상기 버퍼층은 알루미늄이 도핑된 산화아연(Al-doped ZnO)으로 구성된 것을 특징으로 하는 광전극.
- 제9항에 있어서,
상기 표면보호층은 산화티탄(TiO2)으로 구성된 것을 특징으로 하는 광전극.
- 제1항의 촉매 증착 방법에 따라 제조된 것을 특징으로 하는 광전기화학 촉매.
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| KR1020230019558A KR102838552B1 (ko) | 2023-02-14 | 2023-02-14 | 광전극 반도체 표면에 원자단위의 귀금속 촉매를 광전기화학적 다중 산화-환원 주기로 증착하는 방법 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013226537A (ja) * | 2012-03-26 | 2013-11-07 | Toshiba Corp | 貴金属触媒層、膜電極接合体、電気化学セルおよび貴金属触媒層の製造方法 |
| JP2020104088A (ja) * | 2018-12-28 | 2020-07-09 | 国立大学法人 名古屋工業大学 | 光触媒電極 |
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| KR102014990B1 (ko) | 2013-01-29 | 2019-08-27 | 삼성전자주식회사 | 광전극 구조체용 복합 보호층, 이를 포함하는 광전극 구조체 및 이를 포함하는 광전기화학 전지 |
| KR102132825B1 (ko) * | 2017-08-24 | 2020-07-13 | 한국과학기술원 | 촉매 유지층을 포함하는 광전극, 이의 제조 방법, 및 상기 광전극을 포함하는 광전기화학 셀 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013226537A (ja) * | 2012-03-26 | 2013-11-07 | Toshiba Corp | 貴金属触媒層、膜電極接合体、電気化学セルおよび貴金属触媒層の製造方法 |
| JP2020104088A (ja) * | 2018-12-28 | 2020-07-09 | 国立大学法人 名古屋工業大学 | 光触媒電極 |
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