iron mesotetrakis(4-aminophenyl)porphyrin;5,10,15,20-tetrakis(4-aminophenyl)porphin iron;iron tetra(o-aminophenyl)porphyrin;poly iron tetra(o-aminophenyl)porphyrin
Systematic Selection of Metalloporphyrin-Based Catalysts for Oxygen Reduction by Modulation of the Donor-Acceptor Intermolecular Hardness
作者:Justus Masa、Wolfgang Schuhmann
DOI:10.1002/chem.201203846
日期:2013.7.15
Incisive modulation of the intermolecularhardness between metalloporphyrins and O2 can lead to the identification of promising catalysts for oxygenreduction. The dependency of the electrocatalytic reduction of O2 by metalloporphyrins on the nature of the central metal yields a volcano‐type curve, which is rationalized to be in accordance with the Sabatier principle by using an approximation of the
Porphyrin‐based NiFe Porous Organic Polymer Catalysts for the Oxygen Evolution Reaction
作者:Jing Meng、Ze Xu、Hongxi Li、David James Young、Chuanjiang Hu、Yonggang Yang
DOI:10.1002/cctc.202001876
日期:2021.3.5
Porphyrin‐based NiFe porousorganicpolymers (POPs) have been synthesized with good porosity and large BET surface areas (261 to 313 m2 g−1). These bimetallic POPs exhibit RuO2‐like OER activity, with the reaction for catalyst FeTAPP‐NiTCPP‐POP reaching a current density of 10 mA cm−2 at a low overpotential of 338 mV and with a small Tafel slope of 52 mV dec−1. FeTAPP‐NiTCPP‐POP was stable over a long
合成了基于卟啉的NiFe多孔有机聚合物(POPs),具有良好的孔隙率和较大的BET表面积(261至313 m 2 g -1)。这些双金属POP表现出类似RuO 2的OER活性,催化剂FeTAPP-NiTCPP-POP的反应在338 mV的低过电势和10 mf的小TAfel斜率下达到10 mA cm -2的电流密度dec -1。FeTAPP-NiTCPP-POP在反应条件下长期稳定。由于铁和镍中心之间的协同相互作用,这些双金属POPs表现出比单金属POPs更好的催化活性,从而促进了电催化过程。
Amino-metalloporphyrin polymers derived Fe single atom catalysts for highly efficient oxygen reduction reaction
作者:Qian He、Yuying Meng、Hao Zhang、Ying Zhang、Qingdi Sun、Tao Gan、Huajian Xiao、Xiaohui He、Hongbing Ji
DOI:10.1007/s11426-019-9703-7
日期:2020.6
Recently, nitrogen-doped porous carbon supported single atom catalysts (SACs) have become one of the most promising alternatives to precious metal catalysts in oxygen reduction reaction (ORR) due to their outstanding performance, especially those derived from porphyrin-based materials. However, most of them involve other metal residuals, which would cause the tedious pre- and/or post-treatment, even mislead the mechanistic investigations and active-site identification. Herein, we report a precursor-dilution strategy to synthesize Fe SACs through the Schiff-based reaction via co-polycondensation of amino-metalloporphyrin, followed by pyrolysis at high temperature. Systematic characterization results provide the compelling evidence of the dominant presence of atomically dispersed Fe-Nx species. Our catalyst shows superior ORR performance with positive half-wave potential (E1/2=0.85 V vs. RHE) in alkaline condition and moderate activity (E1/2=0.68 V vs. RHE) under the acidic condition, excellent methanol tolerance and good long-term stability. All the results indicate Fe SACs would be a promising candidate for replacing the precious Pt in metal-air batteries and fuel cells.
最近,氮掺杂多孔碳支持的单原子催化剂(SACs)已成为氧还原反应(ORR)中最有前途的贵金属催化剂替代品之一,特别是那些来源于卟啉基材料的催化剂,其性能突出。然而,其中大多数涉及其他金属残留物,这会导致繁琐的前处理和/或后处理,甚至干扰机理研究和活性位点的识别。在此,我们报告了一种前驱体稀释策略,通过胺金属卟啉的Schiff反应进行共聚合,合成Fe SACs,随后进行高温热解。系统的表征结果提供了原子分散的Fe-Nx物种主要存在的有力证据。我们的催化剂在碱性条件下显示出优越的ORR性能,正半波电位(E1/2=0.85 V vs. RHE),在酸性条件下则表现出适度的活性(E1/2=0.68 V vs. RHE),并且具有出色的甲醇耐受性和良好的长期稳定性。所有结果表明,Fe SACs将成为替代贵金属铂在金属-空气电池和燃料电池中的有希望的候选材料。
Heat‐Treated Aerogel as a Catalyst for the Oxygen Reduction Reaction
作者:Noam Zion、David A. Cullen、Piotr Zelenay、Lior Elbaz
DOI:10.1002/anie.201913521
日期:2020.2.3
Aerogels are fascinating materials that can be used for a wide range of applications, one of which is electrocatalysis of the important oxygenreductionreaction. In their inorganic form, aerogels can have ultrahigh catalytic site density, high surface area, and tunable physical properties and chemical structures-important features in heterogeneous catalysis. Herein, we report on the synthesis and
Metal-nitrogen-carbon (M-N-C) single-atom catalysts (SACs) show high catalytic activity for many important chemical reactions. However, an understanding of their intrinsic catalytic activity remains ambiguous because of the lack of well-defined atomic structure control in current M-N-C SACs. Here, we use covalent organic framework SACs with an identical metal coordination environment as model catalysts to elucidate the intrinsic catalytic activity of various metal centers in M-N-C SACs. A pH-universal activity trend is discovered among six 3d transition metals for hydrogen peroxide (H2O2) synthesis, with Co having the highest catalytic activity. Using density functional calculations to access a total of 18 metal species, we demonstrate that the difference in the binding energy of O2* and HOOH* intermediates (EO2* - EHOOH*) on single metal centers is a reliable thermodynamic descriptor to predict the catalytic activity of the metal centers. The predicted high activity of Ir centers from the descriptor is further validated experimentally. This work suggests a class of structurally defined model catalysts and clear mechanistic principles for metal centers of M-N-C SACs in H2O2 synthesis, which may be further extendable to other reactions.