Single Ni Atoms Anchored on Porous Few‐Layer g‐C₃N₄ for Photocatalytic CO₂ Reduction: The Role of Edge Confinement

Small, Journal Year: 2020, Volume and Issue: 16(28)

Published: June 9, 2020

It is greatly intriguing yet remains challenging to construct single-atomic photocatalysts with stable surface free energy, favorable for well-defined atomic coordination and photocatalytic carrier mobility during the photoredox process. Herein, an unsaturated edge confinement strategy defined by coordinating single-atomic-site Ni on bottom-up synthesized porous few-layer g-C3 N4 (namely, Ni5 -CN) via a self-limiting method. This -CN system few isolated clusters distributed of beneficial immobilize nonedged species, thus achieving high active site density. Remarkably, exhibits comparably activity CO2 reduction, giving CO generation rate 8.6 µmol g-1 h-1 under visible-light illumination, which 7.8 times that pure CN, 1.1 ). X-ray absorption spectrometric analysis unveils cationic environment center, formed Ni-N doping-intercalation first shell, motivates superiority in synergistic N-Ni-N connection interfacial transfer. The mechanistic prediction confirms introduced favorably binds , enhances rate-determining step intermediates generation.

Language: Английский

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Pyrolyzed M–N_x catalysts for oxygen reduction reaction: progress and prospects

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(4), P. 2158 - 2185

Published: Jan. 1, 2021

This review showcases the recent progress in understanding and designing M–N_x/C electrocatalysts towards ORR, aiming to provide some guidelines for their practical applications PEMFCs.

Language: Английский

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A historical perspective on porphyrin-based metal–organic frameworks and their applications

Coordination Chemistry Reviews, Journal Year: 2020, Volume and Issue: 429, P. 213615 - 213615

Published: Oct. 21, 2020

Language: Английский

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Heteroatom‐Doping of Non‐Noble Metal‐Based Catalysts for Electrocatalytic Hydrogen Evolution: An Electronic Structure Tuning Strategy

Small Methods, Journal Year: 2021, Volume and Issue: 5(4)

Published: Jan. 25, 2021

Abstract Electrocatalytic water splitting for hydrogen production is an appealing way to reduce carbon emissions and generate renewable fuels. This promising process, however, limited by its sluggish reaction kinetics high‐cost catalysts. Construction of low‐cost high‐performance non‐noble metal‐based catalysts have been one the most effective approaches address these grand challenges. Notably, electronic structure tuning strategy, which could subtly tailor states, band structures, adsorption ability catalysts, has become a pivotal further enhance electrochemical reactions based on Particularly, heteroatom‐doping plays role in regulating optimizing intrinsic activity Nevertheless, kinetics, particular, functional mechanisms hetero‐dopants yet remains ambiguous. Herein, recent progress comprehensively reviewed heteroatom doped electrocatalysts evolution reaction, particularly focus effect corresponding synthetic pathway, catalytic performance, origin. review also attempts establish correlation between localized structures properties, so as provide good reference developing advanced

Language: Английский

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Ultrastable MXene@Pt/SWCNTs' Nanocatalysts for Hydrogen Evolution Reaction

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 30(47)

Published: May 8, 2020

Abstract Developing nano‐ or atom‐scale Pt‐based electrocatalysts for hydrogen evolution reaction (HER) is of considerable importance to mitigate the issues associated with low abundance Pt. Here, a protocol constructing hierarchical Pt––MXene–single‐walled carbon nanotubes' (SWCNTs) heterostructure HER catalysts presented. In heterostructure, highly active nano/atom‐scale metallic Pt immobilized on Ti 3 C 2 T x MXene flakes (MXene@Pt) that are connected conductive SWCNTs' network. The constructed by filtrating mixed colloidal suspension containing MXene@Pt and SWCNTs. Taking advantages hydrophilicity reducibility MXene, prepared spontaneously reducing cations into without additional reductants post‐treatments. so‐fabricated catalysts, in form membrane, show high stability during 800 h operation, volume current density up 230 mA cm −3 at −50 mV versus reversible electrode (RHE) overpotential −62 RHE −10 −2 . This solution‐processed strategy offers simple, efficient, yet scalable approach construct stable efficient catalysts. Given properties structure–activity relationships Pt–MXene–SWCNTs' other MXenes probably greater promise electrocatalysis.

Language: Английский

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