Atomically Dispersed Pt–N3C1 Sites Enabling Efficient and Selective Electrocatalytic C–C Bond Cleavage in Lignin Models under Ambient Conditions
Top Cited Papers
- 17 June 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 143 (25), 9429-9439
- https://doi.org/10.1021/jacs.1c02328
Abstract
Selective cleavage of C–C linkages is the key and a challenge for lignin degradation to harvest value-added aromatic compounds. To this end, electrocatalytic oxidation presents a promising technique by virtue of mild reaction conditions and strong sustainability. However, the existing electrocatalysts (traditional bulk metal and metal oxides) for C–C bond oxidative cleavage suffer from poor selectivity and low product yields. We show for the first time that atomically dispersed Pt–N3C1 sites planted on nitrogen-doped carbon nanotubes (Pt1/N-CNTs), constructed via a stepwise polymerization–carbonization–electrostatic adsorption strategy, are highly active and selective toward Cα–Cβ bond cleavage in β-O-4 model compounds under ambient conditions. Pt1/N-CNTs exhibits 99% substrate conversion with 81% yield of benzaldehyde, which is exceptional and unprecedented compared with previously reported electrocatalysts. Moreover, Pt1/N-CNTs using only 0.41 wt % Pt achieved a much higher benzaldehyde yield than those of the state-of-the-art bulk Pt electrode (100 wt % Pt) and commercial Pt/C catalyst (20 wt % Pt). Systematic experimental investigation together with density functional theory (DFT) calculation suggests that the superior performance of Pt1/N-CNTs arises from the atomically dispersed Pt–N3C1 sites facilitating the formation of a key Cβ radical intermediate, further inducing a radical/radical cross-coupling path to break the Cα–Cβ bond. This work opens up opportunities in lignin valorization via a green and sustainable electrochemical route with ultralow noble metal usage.Keywords
Funding Information
- Ministry of Science and Technology of the People's Republic of China (2018YFA0702003, 2020YFA0406101)
- China Postdoctoral Science Foundation (2019M660421)
- National Natural Science Foundation of China (21871159, 21890383, 21935001, 21978147, 22005173)
- Science and Technology Key Project of Guangdong Province of China (2020B010188002)
This publication has 89 references indexed in Scilit:
- Chemicals from Lignin: A Review of Catalytic Conversion Involving HydrogenChemSusChem, 2019
- Catalytic oxidation of lignin to valuable biomass-based platform chemicals: A reviewFuel Processing Technology, 2019
- Catalytic Transformation of Lignin for the Production of Chemicals and FuelsChemical Reviews, 2015
- Copper‐ and Vanadium‐Catalyzed Oxidative Cleavage of Lignin using DioxygenChemSusChem, 2015
- Highly selective generation of vanillin by anodic degradation of lignin: a combined approach of electrochemistry and product isolation by adsorptionBeilstein Journal of Organic Chemistry, 2015
- Lignin depolymerisation strategies: towards valuable chemicals and fuelsChemical Society Reviews, 2014
- Copper Catalysts for Selective C-C Bond Cleavage of β‐O‐4 Lignin Model CompoundsAdvanced Synthesis & Catalysis, 2014
- Aerobic Oxidation of Lignin Models Using a Base Metal Vanadium CatalystInorganic Chemistry, 2010
- The Catalytic Valorization of Lignin for the Production of Renewable ChemicalsChemical Reviews, 2010
- Electrolytic Oxidation of LigninJournal of the American Chemical Society, 1946