聚苯胺
动力学
催化作用
电子转移
氧气
化学
选择性
电子传输链
材料科学
化学工程
光化学
聚合
聚合物
有机化学
生物化学
物理
量子力学
工程类
作者
Yunjie Zhou,Xiaoqing Gu,Jie Wu,Hui Huang,Mingwang Shao,Yang Liu,Zhenhui Kang
标识
DOI:10.1016/j.apcatb.2022.122105
摘要
Electrocatalytic two-electron (2e−) oxygen reduction reaction (ORR) is a promising method to realize the sustainable production of H2O2. However, the 4e− pathway competes with 2e− ORR, presenting a challenge to the design of highly selective, low-cost catalysts. In addition to the design of active sites, the regulation on electrocatalytic kinetics is another strategy to get ideal 2e− ORR route. Here, cobalt doped carbon dots (CDs-Co) were used to regulate the electron transport kinetics on polyaniline (PANI) by constructing p-n heterojunction. The electron transfer kinetics and oxygen molecular activation process on PANI/CDs-Co were studied and analyzed using the transient photo-induced voltage (TPV) and pulse voltage-induced current (PVC) technologies, respectively. These results show that CDs-Co not only reduces the over-potential of oxygen molecular activation, but also reduces the transient electron concentration on PANI, which effectively improves the selectivity and activity of H2O2 production via ORR. The obtained PANI/CDs-Co-2 shows a H2O2 selectivity nearly 100.0% higher than that of PANI (76.3%). And it exhibits a H2O2 productivity of 3.5 mol g−1cat h−1 at 0 V vs. RHE tested by gas diffusion electrode device. This work provides new insights for the design of 2e− ORR catalysts and the study of electrocatalytic kinetics.
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