通过FePc/Mg(OH) 2异质连接调节铁中心的自旋状态,提高氧气减氧性能
Wenlin Zhang1, Di Jiao1, Lu-Hua Zhang1
1National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130 PR China.
这项研究引入了一种新的铁酸催化剂 (FePc),该催化剂固定在MgOH2/N化碳纳米片上,以提高氧降解反应 (ORR) 活性. 这种新型催化剂与商业类催化剂相比,表现出更高的性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 铁酸 (FePc) 是氧降解反应 (ORR) 的潜在非贵金属催化剂.
- 由于其平面FeN4位点,FePc的内在ORR活性受到其低氧吸附和激活能力的限制.
- 开发有效的Fe基催化剂需要策略来增强氧相互作用和反应动力学.
研究的目的:
- 设计和合成一种新的三元催化剂FePc/Mg(OH) 2/NC,以提高ORR性能.
- 为了研究固FePc在Mg(OH) 2/N-doped碳支器上对其电子结构和催化活性的影响.
- 为设计先进的基于Fe的非贵金属催化剂提供一种新的方法.
主要方法:
- 三元催化剂FePc/Mg(OH) 2/NC. 的合成
- 用于ORR性能评估的催化剂的电化学表征.
- 理论计算和实验分析以了解电子结构和催化机制.
主要成果:
- 形成FePc/Mg(OH) 2异质结会诱导铁活性部位的自旋状态从中旋转到低旋转.
- 这种自旋状态调制增强了氧中间体的吸附和激活,改善了ORR动态.
- 在性介质中,FePc/Mg(OH) 2/NC表现出优异的ORR性能 (E0 = 1.02 V,E1/2 = 0.91 V),表现优于Pt/C和FePc/NC.
结论:
- 固FePc在Mg (OH) 2/N-化碳纳米片上有效地增强了ORR活动.
- FePc/Mg(OH) 2异质连接在调整Fe活性位点的电子特性,以改善催化作用方面发挥着至关重要的作用.
- 本研究提出了一种可行的策略,通过将金属氧化物/氧化物纳入设计高性能Fe基催化剂.
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