Citation: Wenxiang Zhu, Kui Yin, Mengjie Ma, Qintao Sun, Fan Liao, Hui Huang, Jinxin Chen, Kun Feng, Hao Yang, Jun Zhong, Tao Cheng, Mingwang Shao, Yang Liu, Zhenhui Kang. Carbon-dots-facilitated oxygen migration in heterophase iridium oxide for enhanced acidic water oxidation[J]. Chinese Chemical Letters, ;2026, 37(4): 110749. doi: 10.1016/j.cclet.2024.110749 shu

Carbon-dots-facilitated oxygen migration in heterophase iridium oxide for enhanced acidic water oxidation

Wenxiang Zhu ^{a, 1} ,
Kui Yin ^{a, 1} ,
Mengjie Ma ^{a, 1} ,
Qintao Sun ^a ,
Fan Liao ^{a, *,} ,
Hui Huang ^a ,
Jinxin Chen ^a ,
Kun Feng ^a ,
Hao Yang ^a ,
Jun Zhong ^a ,
Tao Cheng ^{a, *,} ,
Mingwang Shao ^{a, *,} ,
Yang Liu ^{a, *,} ,
Zhenhui Kang ^{a, b, *,}

a.
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
b.
Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Macau SAR 999078, China

Received Date: 23 September 2024
Revised Date: 6 December 2024
Accepted Date: 11 December 2024
Available Online: 12 December 2024

Figures(4)

Water electrolysis for practical applications faces challenges such as slow kinetics of catalysts in oxygen evolution reaction (OER). These can be effectively improved by facilitating the migration of oxygen intermediates at the material's interface. In this work, we employed carbon dots to modify a heterophase Ir-based oxide catalyst (h-IrO₂@CDs) to improve their acidic OER performance. Experimental and theoretical studies reveal that CDs enhances oxygen intermediate migration between rutile and 1T phases, enabling a synergistic oxidation pathway. The small amount addition of CDs reduces energy barriers in the rate-determining step and mitigates excessive oxidation, which significantly boost catalytic activity and stability of IrO₂@CDs. The optimal h-IrO₂@CDs-3 catalyst achieves a low overpotential (161 mV) for 10 mA/cm² OER current and remains stable for > 762 h at 10 mA/cm². The low cost and easy synthesis make CDs highly promising for enhancing overall performance in catalytic fields.
- Electrocatalysis,
- Oxygen evolution reaction,
- Heterophase iridium oxide,
- Carbon dot,
- Oxygen migration
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