Circumventing Challenges: Design of Anodic Electrocatalysts for Hybrid Water Electrolysis Systems

Advanced Energy Materials, Год журнала: 2022, Номер 13(4)

Опубликована: Дек. 15, 2022

Abstract Water electrolysis, driven by renewable energy resources, is a promising conversion technology that has gained intensive interest in recent years. However, conventional water electrolysis faces number of challenges, including large thermodynamic potential gaps, valueless anodic products, explosive hydrogen/oxygen mixtures, reactive oxygen species, and limited pure water. Hybrid appending different electrolytes the anode compartment to circumvent above‐mentioned challenges particularly attractive alternative. In this review, for first time, holistic subtle description hybrid provided, focusing on design high‐activity/selectivity/stability electrocatalysts electrochemical oxidation various chemicals, such as alcohol, aldehyde, amine, urea hydrazine, or evolution reaction seawater electrolytes. Comprehensive judging criteria reactions, electrocatalysts, parameters are discussed. Some technoeconomic assessments, feasibility analyses, mechanism explorations, correlation comparisons involved. Finally, perspectives opportunities future research directions systems outlined.

Язык: Английский

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High‐Entropy Catalyst—A Novel Platform for Electrochemical Water Splitting

Advanced Functional Materials, Год журнала: 2022, Номер 32(47)

Опубликована: Сен. 16, 2022

Abstract High‐entropy materials (HEMs) have been in the spotlight as emerging catalysts for electrochemical water splitting. In particular, HEM feature multi‐element active sites and unsaturated coordination well entropy stabilization comparison with their single‐element counterparts. Herein, a comprehensive overview of used splitting is provided, covering both hydrogen evolution reaction (HER) oxygen (OER). Particularly, review begins discussions concept structure HEMs. addition, effective strategies rationally designing HEMs on basis computational techniques experimental aspects described. Importantly, importance computationally aided methods, that is, density functional theory calculations, high‐throughput screening, machine learning, to discovery design HEMs, Furthermore, applications field electrolysis are reviewed. Eventually, an outlook regarding prospects future opportunities provided.

Язык: Английский

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Mutual Self-Regulation of d-Electrons of Single Atoms and Adjacent Nanoparticles for Bifunctional Oxygen Electrocatalysis and Rechargeable Zinc-Air Batteries

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Фев. 11, 2023

Rechargeable zinc-air batteries (ZABs) are a promising energy conversion device, which rely critically on electrocatalysts to accelerate their rate-determining reactions such as oxygen reduction (ORR) and evolution (OER). Herein, we fabricate range of bifunctional M-N-C (metal-nitrogen-carbon) catalysts containing M-Nx coordination sites M/MxC nanoparticles (M = Co, Fe, Cu) using new class γ-cyclodextrin (CD) based metal-organic framework the precursor. With two types active interacting with each other in catalysts, obtained Fe@C-FeNC Co@C-CoNC display superior alkaline ORR activity terms low half-wave (E1/2) potential (~ 0.917 0.906 V, respectively), higher than Cu@C-CuNC 0.829 V) commercial Pt/C 0.861 V). As electrocatalyst, exhibits best performance, showing ORR/OER overpotential (ΔE) ~ 0.732 is much lower that 0.831 1.411 V), well most robust reported date. Synchrotron X-ray absorption spectroscopy density functional theory simulations reveal strong electronic correlation between metallic Co atomic Co-N4 catalyst can increase d-electron near Fermi level thus effectively optimize adsorption/desorption intermediates ORR/OER, resulting an enhanced electrocatalytic performance. The Co@C-CoNC-based rechargeable ZAB exhibited maximum power 162.80 mW cm-2 at 270.30 mA cm-2, combination + RuO2 158.90 265.80 cm-2) catalysts. During galvanostatic discharge 10 delivered almost stable voltage 1.2 V for 140 h, signifying virtue excellent activity.

Язык: Английский

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Precious Metal Free Hydrogen Evolution Catalyst Design and Application

Chemical Reviews, Год журнала: 2024, Номер 124(9), С. 5617 - 5667

Опубликована: Апрель 25, 2024

The quest to identify precious metal free hydrogen evolution reaction catalysts has received unprecedented attention in the past decade. In this Review, we focus our recent developments reactions acidic and alkaline electrolyte owing their relevance commercial near-commercial low-temperature electrolyzers. We provide a detailed review critical analysis of catalyst activity stability performance measurements metrics commonly deployed literature, as well best practices for experimental (both half-cell three-electrode configurations two-electrode device testing). particular, discuss transition from laboratory-scale (HER) those single cells, which is aspect crucial scaling up laboratory industrial settings but often overlooked. Furthermore, numerous design strategies across HER literature. Subsequently, showcase some most investigated families catalysts; molybdenum disulfide-based, phosphides, carbides electrolyte; nickel phosphides alkaline. This includes comprehensive comparing between several materials highlighting stagnation with regards enhancing intrinsic catalysts. Finally, summarize future directions recommendations field area electrocatalysis.

Язык: Английский

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Self-supported electrocatalysts for the hydrogen evolution reaction

Materials Chemistry Frontiers, Год журнала: 2022, Номер 7(4), С. 567 - 606

Опубликована: Дек. 15, 2022

The high-performance self-supported electrocatalysts for the hydrogen evolution reaction are systematically summarized.

Язык: Английский

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Stabilizing non-iridium active sites by non-stoichiometric oxide for acidic water oxidation at high current density

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

Опубликована: Ноя. 23, 2023

Stabilizing active sites of non-iridium-based oxygen evolution reaction (OER) electrocatalysts is crucial, but remains a big challenge for hydrogen production by acidic water splitting. Here, we report that non-stoichiometric Ti oxides (TiOx) can safeguard the Ru through structural-confinement and charge-redistribution, thereby extending catalyst lifetime in acid 10 orders magnitude longer compared to stoichiometric one (Ru/TiO2). By exploiting redox interaction-engaged strategy, situ growth TiOx on foam loading nanoparticles are realized step. The as-synthesized binder-free Ru/TiOx exhibits low OER overpotentials 174 265 mV at 500 mA cm-2, respectively. Experimental characterizations theoretical calculations confirm stabilizes center, enabling operation cm-2 over 37 days. This work opens an avenue using compounds as stable materials energy technologies.

Язык: Английский

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MOFs coupled transition metals, graphene, and MXenes: Emerging electrocatalysts for hydrogen evolution reaction

Chemical Engineering Journal, Год журнала: 2024, Номер 482, С. 148776 - 148776

Опубликована: Янв. 18, 2024

Язык: Английский

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Recent advances in interface engineering of Fe/Co/Ni-based heterostructure electrocatalysts for water splitting

Materials Horizons, Год журнала: 2023, Номер 10(7), С. 2312 - 2342

Опубликована: Янв. 1, 2023

The application and prospect of Fe/Co/Ni-based catalysts modified by interface engineering, biomass electrooxidation reaction (BEOR) coupled with hydrogen evolution (HER) in water splitting are summarized.

Язык: Английский

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3D Hierarchical‐Architectured Nanoarray Electrode for Boosted and Sustained Urea Electro‐Oxidation

Small, Год журнала: 2023, Номер 19(30)

Опубликована: Апрель 10, 2023

Exploring active and durable Ni-based materials with optimized electronic architectural engineering to promote the urea oxidation reaction (UOR) is pivotal for urea-related technologies. Herein a 3D self-supported hierarchical-architectured nanoarray electrode (CC/MnNi@NC) proposed in which 1D N-doped carbon nanotubes (N-CNTs) 0D MnNi nanoparticles (NPs) encapsulation are intertwined into 2D nanosheet aligned on cloth prominently boosted sustained UOR electrocatalysis. From combined experimental theoretical investigations, Mn-alloying can regulate Ni state downshift of d-band center, facilitating Ni3+ species generation prompting rate-determining step (*COO intermediate desorption). Meanwhile, micro/nano-hierarchical configuration N-CNTs encapsulating NPs not only endow strong operational durability against metal corrosion/agglomeration enrich density sites, but also accelerate electron transfer, more intriguingly, mass transfer as result desirable superhydrophilic quasi-superaerophobic characteristics. Therefore, such elegant integration 0D, motifs architecture, resulting CC/MnNi@NC deliver admirable performance, favorably comparable best-performing electrocatalysts reported thus far. This work opens fresh prospect developing advanced via manipulation coupled various energy conversion

Язык: Английский

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Synergistic Integration of MXene and Metal-Organic Frameworks for Enhanced Electrocatalytic Hydrogen Evolution in an Alkaline Environment

Catalysts, Год журнала: 2023, Номер 13(5), С. 802 - 802

Опубликована: Апрель 26, 2023

The development of transition metal (TM) catalysts to replace precious metals has garnered increasing interest. Specifically, platinum (Pt)-based have been extensively investigated for their electrochemical performance in hydrogen evolution reaction (HER), which offer a clean means producing fuel without carbon emissions. However, the reliance on Pt-based hindered progress HER development. Therefore, researchers explored metal-organic frameworks (MOFs) as substitute noble address this issue. Nevertheless, low electroconductivity pure MOFs restricts application fields. To overcome limitation, MXenes emerged promising two-dimensional (2D) material coupling with create an electrocatalyst high electrical conductivity, large surface area, and tunable structure. In study, we report synthesis Ti3C2Tx (MXene) nanosheet-encapsulated catalyst (Ti3C2Tx@ZIF-8) activity cost by encapsulating precursor ZIF-8 alkaline media. exhibits overpotential only 507 mV at 20 mA/cm2 Tafel slope value 77 mV/dec. Additionally, cyclic voltammetry (CV) indicates active area (ECSA) 122.5 cm2, chronopotentiometry demonstrates stable nature over h any significant changes value. excellent properties Ti3C2Tx@ZIF-8 suggest its potential energy conversion applications.

Язык: Английский

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