在碳中单原子和异原子共的协同作用,使氧化有效电合成
Chunxiao Liu1, Kangjuan Cheng1, Qiuxu Chen1
1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, P.R. China.
Angewandte Chemie (International ed. in English)
|December 16, 2025
概括
具有协同作用的Ni,B和N辅助剂的单原子催化剂通过两电子氧降解反应 (2e-ORR) 有效地产生过氧化 (H2O2). 这种先进的催化剂在实际的H2O2电合成中表现出高的选择性和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 单原子催化剂为两电子氧降解反应 (2e-ORR) 提供了高贵金属的经济有效替代品.
- 过氧化 (H2O2) 电合成的挑战包括平衡活性,选择性和稳定性.
研究的目的:
- 开发一种单原子催化剂,用于高效,稳定的H2O2电合成.
- 研究Ni,B和N辅助剂对2e-ORR的协同作用.
主要方法:
- 制造一个Ni,B,N共碳矩阵 (Ni-BNC) 单原子催化剂.
- 在流细胞中对2e-ORR的Ni-BNC催化剂的电化学评估.
- 现场红外光谱学和运动分析以阐明反应机制.
- 在一个有孔的固体电解质反应堆中进行持续H2O2生产的演示.
主要成果:
- 尼-BNC催化剂在高电流密度下 (高达~-400 mA cm-2) 实现了H2O2的法拉代效率>90%.
- 高选择性 (>90%) 在 -100 mA cm-2.0下维持超过50小时.
- 获得了31.13mol g-1 h-1的最大H2O2生产率.
- 已经证明了100小时连续生产纯净,无盐的H2O2 (>1,400 ppm).
结论:
- 碳矩阵中的Ni,B和N原子的协同集成有效调节2e-ORR,以实现高效的H2O2电合成.
- B,N-协调电子调节Ni活性位点,降低H2O2生产的动力障碍.
- 原子层次的协同作用是设计超出单一活动场所工程的先进电催化剂的强大策略.
更多相关视频
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
4.1K
08:13Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
Published on: February 19, 2018
12.3K
相关概念视频
Catalysis
30.0K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.0K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.8K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.8K
Reduction of Alkenes: Catalytic Hydrogenation
13.9K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
13.9K
