A benzimidazole-linked bimetallic phthalocyanine–porphyrin covalent organic framework synergistically promotes CO₂electroreduction

Abstract

Bimetallic catalysts have recently emerged as promising candidates for CO2 reduction. However, it is still critical to strategically synthesize atomically precise bimetallic catalysts and clarify the interaction mechanism of bimetal...

Isolated cobalt–nitrogen sites on high-curvature carbon achieving industrial-level current density and pH-universal CO2 electroreduction

“…1e). 30,31 Inductively coupled plasma-mass spectroscopy (ICP-MS) measurements reveal that the Co contents in c-Co SAC (0.64 wt%) and p-Co SAC (0.61 wt%) are nearly identical. The characterization results of p-Co SAC indicate that the surface chemical states and metal loading are consistent with those of c-Co SAC (Fig.…”

Coupling electrocatalytic redox-active sites in a three-dimensional bimetalloporphyrin-based covalent organic framework for enhancing carbon dioxide reduction and oxygen evolution

“…To better understand the different activities with different catalytic centres, the reaction mechanisms of electrocatalytic CDRR, HER and OER for Co/Ni–TPNB-COF , Co–TPNB-COF and Ni–TPNB-COF are further explored via the free energy pathway. 15,19,25,30 Considering that CO is the main product in CDRR catalysed by the Co( ii )-porphyrin centre, it is possible to adsorb CO 2 on the Co( ii )-porphyrin sites for the CO 2 -to-CO conversion. As shown in Fig.…”

“…14–18 Recently, the dual-metal site strategy has been considered as an alternative approach to improve electrocatalytic efficiency by exploiting the synergistic effect of individual metal sites. 19–22 However, this strategy is challenging for the simultaneous promotion of CDRR and OER because both reactions on actual catalysts are influenced by numerous factors, including the coordination environment, available active sites, relative positions, etc. , 23 making it difficult to distinguish the intrinsic catalyst activity and to profoundly understand their synergy mechanism at the molecular structure level.…”

Single-Atom Catalysts on Covalent Organic Frameworks for Energy Applications

“…Moreover, porphyrin and phthalocyanine moieties could be involved in COFs simultaneously by benzimidazole linkages. The bimetallic nitrogen-rich COF showed a high FE(CO) of 97.1% …”