Multi-purpose heterogeneous catalyst material from an amorphous cobalt metal–organic framework

Abstract

Sustainable technologies rely on the development of universal catalyst materials. While a lot of the attention has been given to improving the performance of one single catalyst material for one...

Iron Triad-Based Bimetallic M–N–C Nanomaterials as Highly Active Bifunctional Oxygen Electrocatalysts

“…Bimetallic M–N–C catalysts were synthesized by carbonizing metal organic materials containing Fe and Co, or Fe and Ni, or Co and Ni. Initially, the organic ligand solutions were mixed with corresponding metal chlorides to form MOMs. − Upon carbonization and acid etching of these MOMs, the resulting bimetallic M–N–C catalysts were obtained, as depicted in Scheme .…”

“…In this study, we aim to address the challenge of identifying optimal combinations of transition metals for the fabrication of M–N–C materials that incorporate carbon-embedded bimetallic nanoparticles of the iron triad. To accomplish this, we introduce a novel synthesis strategy involving the use of an electron-rich benzimidazole-derived organic ligand 1 H -benzo­[ d ]­imidazole-5,6-diol. − This ligand is designed to provide nitrogen- and oxygen-containing sites that facilitate the effective incorporation of various metals at the initial stage of metal–organic material (MOM) formation. The resulting iron triad MOM-derived materials are characterized and evaluated for their electrocatalytic activity in the ORR and the OER in alkaline media.…”

Mechanosynthesis of a bifunctional FeNi–N–C oxygen electrocatalyst via facile mixed-phase templating and preheating-pyrolysis

“…In pursuit of a better alternative, metal-nitrogen-doped carbon (M-N-C) catalysts rose as a potential solution, with the metal component typically being cost-effective and widely available transition metals (Fe, Co, Ni, Mn, Zn, etc.). [12][13][14] The carbon matrix in M-N-Cs exhibits excellent conductivity while nitrogen-and metal-based catalytic sites enable bifunctional catalytic activity comparable to that of PGMs. 15 More specically, pyridinic and graphitic nitrogen species and metal single atom sites are responsible for the efficient ORR activity, [16][17][18] whereas metal nanoparticles facilitate OER activity.…”

“…). 12–14 The carbon matrix in M–N-Cs exhibits excellent conductivity while nitrogen- and metal-based catalytic sites enable bifunctional catalytic activity comparable to that of PGMs. 15 More specifically, pyridinic and graphitic nitrogen species and metal single atom sites are responsible for the efficient ORR activity, 16–18 whereas metal nanoparticles facilitate OER activity.…”

Synthesis of Bibenzyl Derivatives via Visible-Light-Promoted 1,5-Hydrogen Atom Transfer/Radical Coupling Reactions of N-Fluorocarboxamides

“…2012 年, O'Shea 课题 组 [12] 开发了一种新型的金属化试剂 BuLi/KO t Bu/TMP (LiNK), 利用该试剂成功实现了甲苯及其衍生物的金属 化得到了苄基阴离子, 随后通过 1,2-二溴乙烷的氧化作 用高效得到了一系列联苄基类化合物( Scheme 1,b). 此 外 , 利用苄基卤化物在格式试剂存在下的 C(sp 3 ) -C(sp 3 )自偶联反应合成联苄基衍生物也是常用方法之一 (Scheme 1, c) [13] , 但该方法往往需要加入等物质的量的 有机金属试剂如 Li [13a] , Cu [13c] , Mg [13d] 或 Ni [13b] , 直到最 近才实现过渡金属的催化反应(Rh 和 Co) [14][15] . 基于以 上文献报道合成方法的局限性, 寻找一种更加简单高效 的合成方法显得尤为重要.…”