缺陷介导的高负荷金属单原子催化剂直接减少氧的反应选择性到H2O2的产生
Ze Lin1, Jenyuk Lohwacharin2, Yahui Li1
1State Key Laboratory of Water Pollution Control and Green Resource Recycling, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
一个新的缺陷介导策略使过渡金属单原子催化剂 (TM-SAC) 的高金属负载成为可能. 这种方法优化了电催化剂,通过两电子氧降解反应 (2e-ORR) 进行高效的过氧化合成.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 过渡金属单原子催化剂 (TM-SACs) 在两电子氧降解反应 (2e-ORR) 中具有前景.
- 由于金属负载较低,TM-SAC的实际使用受到限制,这影响了催化性能.
- 开发具有高金属负载的TM-SAC对于增强催化活性至关重要.
研究的目的:
- 为制造具有高金属负载的TM-SAC制定通用缺陷中介策略.
- 通过使用添加碳点 (NCD) 作为支持物来研究TM-SACs的合成.
- 探索不同金属原子对过氧化 (H2O2) 合成的ORR选择性的调节.
主要方法:
- 使用由EDTA衍生的NCD中介的缺陷策略制造TM-SAC
- 在NCD (FeSA-NC,NiSA-NC,CuSA-NC) 上支持Fe,Ni和Cu单原子催化剂的制备.
- 在中性条件下对2e-ORR合成的催化剂进行电催化评估.
主要成果:
- 成功合成高金属负载的TM-SAC,重量高达6.87%.
- 证明了ORR选择性对2e-ORR路径的精确调节,以产生H2O2.
- 在中性介质中,NiSA-NC催化剂实现了81.0%的H2O2选择性和高产量 (2972.2 mmol L-1 h-1 gcat.-1).
结论:
- 缺陷介导策略为构建高负载TM-SAC提供了一种一般方法.
- 这种方法可以合理设计高效的电催化剂,以实现可持续的H2O2合成.
- 这项研究为选择性电化学反应优化TM-SAC提供了新的见解.
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