Conjugated Covalent Organic Frameworks as Platinum Nanoparticle Supports for Catalyzing the Oxygen Reduction Reaction

Abstract

Developing highly efficient and durable electrocatalysts for the oxygen reduction reaction (ORR) is essential for commercializing renewable and clean energy, but this remains a challenge. Herein, we design an electrocatalyst by confining Pt nanoparticles on a conjugated nitrogen-rich covalent organic framework (COF) and demonstrate its ORR activity in an acid electrolyte. In the catalyst, multiple pyridinic nitrogens act as nucleation sites for controllably growing Pt in a layer over the COF’s surface and the pore channel, resulting in uniform Pt distribution and more accessible Pt active sites. The catalyst exhibits ultrahigh ORR activity with an onset potential of 1.05 V versus reversible hydrogen electrode and a half-wave potential of 0.89 V, which are more positive than those of commercial Pt/C and other reported catalysts. This strategy offers a new way to fabricate electrocatalysts with atomically definite active sites and high-performance catalytic activities for clean energy storage and conversion.

Confinement synthesis in porous molecule-based materials: a new opportunity for ultrafine nanostructures

“…3a). 60 Its Brunauer-Emmett-Teller (BET) surface area was as high as 810 m 2 g À1 , and it possessed abundant nanopores, which could restrict the growth of Pt NPs, thereby preparing highly dispersed ultrane Pt NPs (ca. 2.10 nm).…”

“…Reproduced with permission. 60 Copyright 2020, American Chemical Society. (b) Synthesis and (c) TEM images of Pd@CCOF-CuTPP.…”

Covalent Organic Framework (COF)‐Based Hybrids for Electrocatalysis: Recent Advances and Perspectives

“…(a–c) Adapted with permission. [ 163 ] Copyright 2020, American Chemical Society. (d–f) Adapted with permission.…”

Design of Photoactive Covalent Organic Frameworks as Heterogeneous Catalyst for Preparation of Thiophosphinates from Phosphine Oxides and Thiols

“…Our research interest is the construction of new COFs with various functionalities, [31] where we recently designed conjugated COF‐loaded Pt nanoparticles as a good electrocatalyst [32] . In this work, we envisioned the development of new photoactive COFs as heterogeneous catalysts for the synthesis of thiophosphinate derivatives through direct oxidation of P(O)H compounds and thiols under visible‐light irradiation for the first time.…”