CoIn dual-atom catalyst for hydrogen peroxide production via oxygen reduction reaction in acid

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Авг. 8, 2023

The two-electron oxygen reduction reaction in acid is highly attractive to produce H2O2, a commodity chemical vital various industry and household scenarios, which still hindered by the sluggish kinetics. Herein, both density function theory calculation in-situ characterization demonstrate that dual-atom CoIn catalyst, O-affinitive In atom triggers favorable stable adsorption of hydroxyl, effectively optimizes OOH on neighboring Co. As result, Co atoms shifts pathway for efficient H2O2 production acid. partial current reaches 1.92 mA cm-2 at 0.65 V rotating ring-disk electrode test, while rate as high 9.68 mol g-1 h-1 three-phase flow cell. Additionally, CoIn-N-C presents excellent stability during long-term operation, verifying practicability catalyst. This work provides inspiring insights into rational design active catalysts other catalytic systems.

Язык: Английский

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Oxygen‐Bridged Indium‐Nickel Atomic Pair as Dual‐Metal Active Sites Enabling Synergistic Electrocatalytic CO₂ Reduction

Angewandte Chemie International Edition, Год журнала: 2022, Номер 62(7)

Опубликована: Дек. 15, 2022

Abstract Single‐atom catalysts offer a promising pathway for electrochemical CO 2 conversion. However, it is still challenge to optimize the performance of dual‐atom catalysts. Here, an atomic indium‐nickel dual‐sites catalyst bridged by axial oxygen atom (O‐In‐N 6 ‐Ni moiety) was anchored on nitrogenated carbon (InNi DS/NC). InNi DS/NC exhibits superior selectivity with Faradaic efficiency higher than 90 % over wide potential range from −0.5 −0.8 V versus reversible hydrogen electrode (vs. RHE). Moreover, industrial partial current density up 317.2 mA cm −2 achieved at −1.0 vs. RHE in flow cell. In situ ATR‐SEIRAS combined theory calculations reveal that synergistic effect In‐Ni and O bridge not only reduces reaction barrier formation *COOH, but also retards undesired evolution reaction. This work provides feasible strategy construct dual‐site towards energy

Язык: Английский

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Implanting CoO_x Clusters on Ordered Macroporous ZnO Nanoreactors for Efficient CO₂ Photoreduction

Advanced Materials, Год журнала: 2022, Номер 34(42)

Опубликована: Сен. 1, 2022

Abstract Despite suffering from slow charge‐carrier mobility, photocatalysis is still an attractive and promising technology toward producing green fuels solar energy. An effective approach to design fabricate advanced architectural materials as photocatalysts enhance the performance of semiconductor‐based photocatalytic systems. Herein, metal–organic‐framework‐derived hierarchically ordered porous nitrogen carbon co‐doped ZnO (N‐C‐ZnO) structures are developed nanoreactors with decorated CoO x nanoclusters for CO 2 ‐to‐CO conversion driven by visible light. Introduction hierarchical nanoarchitectures highly interconnected meso–macroporous channels shows beneficial properties reduction reactions, including enhanced mobility charge carriers throughout accessible framework, maximized exposure active sites, inhibited recombination photoinduced carriers. Density functional theory calculations further reveal key role high affinity molecules, CoO bonds formed on surface composite exhibit stronger redistribution. As a result, obtained /N‐C‐ZnO demonstrates in terms yield long‐term stability.

Язык: Английский

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Designing reliable and accurate isotope-tracer experiments for CO2 photoreduction

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Май 3, 2023

The photoreduction of carbon dioxide (CO2) into renewable synthetic fuels is an attractive approach for generating alternative energy feedstocks that may compete with and eventually displace fossil fuels. However, it challenging to accurately trace the products CO2 on account poor conversion efficiency these reactions imperceptible introduced contamination. Isotope-tracing experiments have been used solve this problem, but they frequently yield false-positive results because improper experimental execution and, in some cases, insufficient rigor. Thus, imperative accurate effective strategies evaluating various potential are developed field. Herein, we experimentally demonstrate contemporary toward isotope-tracing not necessarily rigorous. Several examples where pitfalls misunderstandings arise, consequently making isotope product traceability difficult, demonstrated. Further, develop describe standard guidelines then verify procedure using reported systems.

Язык: Английский

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Ni Single Atoms on Hollow Nanosheet Assembled Carbon Flowers Optimizing Polysulfides Conversion for Li−S Batteries

Advanced Functional Materials, Год журнала: 2023, Номер 33(44)

Опубликована: Авг. 30, 2023

Abstract The sluggish conversion kinetics and shuttling behavior of lithium polysulfides (LiPSs) seriously deteriorate the practical application lithium–sulfur (Li–S) batteries. Herein, Ni single atoms on hollow carbon nanosheet‐assembled flowers (Ni‐NC) are synthesized via a facile pyrolysis‐adsorption process to address these challenges. as‐designed Ni‐NC with enhanced mesoporosity accessible surface area can expose more catalytic sites facilitate electron/ion transfer. These advantages enable Ni‐NC‐modified separator exhibit both confinement‐catalysis ability suppressed LiPSs. Consequently, Li−S battery shows an initial capacity 1167 mAh g −1 low decay ratio (0.033% per cycle) over 700 cycles at 1 C. Even sulfur loading 6.17 mg cm −2 , high areal 5.17 is realized 0.1 C, together superior cycling stability 300 cycles. This work provides catalyst design strategy for development high‐performance

Язык: Английский

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