Electrocatalytic water splitting: Mechanism and electrocatalyst design

Nano Research, Год журнала: 2023, Номер 16(7), С. 9142 - 9157

Опубликована: Апрель 2, 2023

Язык: Английский

---

Methanol upgrading coupled with hydrogen product at large current density promoted by strong interfacial interactions

Energy & Environmental Science, Год журнала: 2023, Номер 16(3), С. 1100 - 1110

Опубликована: Янв. 1, 2023

The ultrafast solution combustion synthesis of heterogeneous interface is developed to boost anodic organic upgrading reaction, which exhibits remarkable current density and faradaic efficiency benefiting from the strong electronic interaction.

Язык: Английский

---

Fine-tune the electronic structure in Co-Mo based catalysts to give easily coupled HER and OER catalysts for effective water splitting

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 328, С. 122474 - 122474

Опубликована: Фев. 15, 2023

Язык: Английский

---

Valence Oscillation of Ru Active Sites for Efficient and Robust Acidic Water Oxidation

Advanced Materials, Год журнала: 2023, Номер 35(48)

Опубликована: Сен. 6, 2023

The continuous oxidation and leachability of active sites in Ru-based catalysts hinder practical application proton-exchange membrane water electrolyzers (PEMWE). Herein, robust inter-doped tungsten-ruthenium oxide heterostructures [(Ru-W)Ox ] fabricated by sequential rapid metal thermomigration processes are proposed to enhance the activity stability acidic oxygen evolution reaction (OER). introduction high-valent W species induces valence oscillation Ru during OER, facilitating cyclic transition states maintaining operation sites. preferential electronic gain heterostructure significantly stabilize RuOx on WOx substrates beyond Pourbaix limit bare RuO2 . Furthermore, asymmetric Ru-O-W units generated around interface adsorb intermediates synergistically, enhancing intrinsic OER activity. Consequently, (Ru-W)Ox not only demonstrate an overpotential 170 mV at 10 mA cm-2 excellent 300 h electrolytes but also exhibit potential for applications, as evidenced stable 0.5 A PEMWE.

Язык: Английский

---

Recent advances in interface engineering strategy for highly‐efficient electrocatalytic water splitting

InfoMat, Год журнала: 2022, Номер 5(1)

Опубликована: Окт. 13, 2022

Abstract The hydrogen energy generated by the electrocatalytic water splitting reaction has been established as a renewable and clean carrier with ultra‐high density, which can well make up for shortcomings of conventional sources, such geographical limitations, climatic dependence, wastage. Notably, introduction electrocatalysts enhance efficiency process to generate hydrogen. Particularly, heterostructure constructed coupling multiple components (or phases) have emerged most promising option due well‐known electronic synergistic effects. existing reviews on interface engineering electrocatalyst design mostly focus relationship between heterostructures specific reactions. However, comprehensive overview integration model building, directional synthesis, mechanism rarely reported. To this end, in review, development catalysts is systematically introduced from perspective classification, growth regulation performance based interfacial microenvironment (bonding, configuration, lattice strain, etc.), thereby offering useful insights construction models. Besides, combined current applications strategies, challenges future are discussed relevant solutions proposed. Overall, review serve theoretical reference mechanism, further promote production technologies low consumption high yield. image

Язык: Английский

---

Modulating Local Interfacial Bonding Environment of Heterostructures for Energy‐Saving Hydrogen Production at High Current Densities

Advanced Functional Materials, Год журнала: 2023, Номер 33(12)

Опубликована: Янв. 8, 2023

Abstract Coupling urea oxidation reaction (UOR) with hydrogen evolution (HER) is an effective energy‐saving technique for generation. However, exploring efficient bifunctional electrocatalysts under high current density still challenging. Herein, hierarchical Fe doped cobalt selenide coupled FeCo layered double hydroxide (Fe‐Co 0.85 Se/FeCo LDH) array as a self‐supported superior heterojunction electrode rationally designed both UOR and HER. The unique heterostructure facilitates electron transfer interface interactions through local interfacial Co‐Se/O‐Fe bonding environment modulation, improving kinetics intrinsic activity. As result, the heterostructured electrocatalyst exhibits ultralow potentials of −0.274 1.48 V to reach 500 mA cm −2 catalyzing HER UOR, respectively. Particularly, full electrolysis system driven by Fe‐Co LDH delivers 300 at relatively low potential 1.57 V, which 150 mV lower than conventional water electrolysis. combination in situ characterization theoretical analysis reveal that active sites adjustable electronic are induced heterojunction, facilitating decomposition stabilization intermediates UOR. This work inspires modulation optimize advanced H 2 production.

Язык: Английский

---

Electronic Modulation of Metal–Organic Frameworks by Interfacial Bridging for Efficient pH‐Universal Hydrogen Evolution

Advanced Functional Materials, Год журнала: 2022, Номер 33(1)

Опубликована: Окт. 26, 2022

Abstract Designing well‐defined interfacial chemical bond bridges is an effective strategy to optimize the catalytic activity of metal–organic frameworks (MOFs), but it remains challenging. Herein, a facile in situ growth reported for synthesis tightly connected 2D/2D heterostructures by coupling MXene with CoBDC nanosheets. The multifunctional nanosheets high conductivity and ideal hydrophilicity as bridging carriers can ensure structural stability sufficient exposure active sites. Moreover, Co–O–Ti formed at interface effectively triggers charge transfer modulates electronic structure Co‐active site, which enhances reaction kinetics. As result, optimized CoBDC/MXene exhibits superior hydrogen evolution (HER) low overpotentials 29, 41, 76 mV 10 mA cm −2 alkaline, acidic, neutral electrolytes, respectively, comparable commercial Pt/C. Theoretical calculation demonstrates that bridging‐induced electron redistribution optimizes free energy water dissociation adsorption, resulting improved evolution. This study not only provides novel electrocatalyst efficient HER all pH conditions also opens up new avenue designing highly systems.

Язык: Английский

---

Ultrafast Combustion Synthesis of Robust and Efficient Electrocatalysts for High-Current-Density Water Oxidation

ACS Nano, Год журнала: 2023, Номер 17(2), С. 1701 - 1712

Опубликована: Янв. 9, 2023

The scalable production of inexpensive, efficient, and robust catalysts for oxygen evolution reaction (OER) that can deliver high current densities at low potentials is critical the industrial implementation water splitting technology. Herein, a series metal oxides coupled with Fe

Язык: Английский

---

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

---

Tuning Co‐Catalytic Sites in Hierarchical Porous N‐Doped Carbon for High‐Performance Rechargeable and Flexible Zn‐Air Battery

Advanced Energy Materials, Год журнала: 2022, Номер 13(1)

Опубликована: Ноя. 6, 2022

Abstract The strategy of heteroatom doping and metal active sites can synergistically promote oxygen electrocatalysis. Especially, the combination theoretical simulations with experimental results provides new opportunities to understand electrocatalytic mechanism. Herein, 3D carbon nanosheets aggregate highly branched nanotubes cobalt (CoCNTs/PNAs) is prepared via facile self‐assembly‐pyrolysis strategy. CoCNTs/PNAs electrocatalysts exhibit superior bifunctional activities reduction ( E 1/2 = 0.925 V) evolution j 10 1.54 reactions, surpassing those Pt/C‐RuO 2 catalysts. calculations reveal that electronic interaction nitrogen‐doped matrix plays a critical role in boosting performance. Additionally, rechargeable Zn‐Air battery (ZAB) assembled aqueous electrolyte exhibits largest power density 371.6 mW cm −2 outstanding cycling durability (over 2000 h). Furthermore, all‐solid‐state cable‐type ZAB delivers high flexibility good stability energy efficiency (76.5%). This work will open avenue adjust metal‐carbon support for functional electrocatalysis hierarchical porous structure design.

Язык: Английский

---