Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO2/MoO3 Composite Thin Film DOI
Uday Kumar Ghorui, Bibhutibhushan Show,

Dipayan Roy

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(3), P. 3460 - 3475

Published: Jan. 15, 2024

Electrochemical water oxidation is believed to be an effective pathway produce clean, carbon-free, and environmentally sustainable green energy. In this work, we report a simple, easy-to-construct, facile, low-cost, single-step galvanic technique synthesize Pd-supported temperature-assisted MoOx thin film nanocomposite for oxidation. The most suitable exhibits very low overpotential at 10 mA/cm2 with smaller Tafel slope values both hydrogen evolution reaction (HER) oxygen (OER) processes in alkaline medium. formation of metal oxide–metal junction accelerates the growth more active sites, promoting induced electronic synergism MoOx–Pd interface. This endows higher electrical conductivity faster electron transfer kinetics, thus accelerating dissociation following Tafel–Volmer mechanism boost HER process excellent electrochemical OER performances our electrocatalyst even supersede accomplishments benchmark catalysts Pt/C RuO2. Moreover, neither these two demonstrates catalytic reactions, i.e., same time, which have been observed synthesized catalyst. Our findings illustrate potential thin-film exceedingly developed by interface engineering strategies. also provides insight into designing several other semiconductor composite using simple synthesis techniques highly efficient HER/OER that could alternatives electrocatalysts electrolysis.

Language: Английский

Triggering interfacial activity of the traditional La0.5Sr0.5MnO3 cathode with Co-doping for proton-conducting solid oxide fuel cells DOI
Yanru Yin,

Shoufu Yu,

Hailu Dai

et al.

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 10(4), P. 1726 - 1734

Published: Dec. 9, 2021

Doping the Co element into traditional La 0.5 Sr MnO 3− δ cathode material triggers activity of cathode/electrolyte interface in composite cathode, leading to impressively high cell performance for proton-conducting solid oxide fuel cells.

Language: Английский

Citations

72
Activating C–H Bonds by Tuning Fe Sites and an Interfacial Effect for Enhanced Methanol Oxidation DOI
Sheng Huang, Feng Feng,

Rong‐Ting Huang

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(50)

Published: Oct. 11, 2022

The interaction mechanism between the reacting species and active site of α-Fe2 O3 -based photoanodes in photoelectrochemical methanol conversion reaction is still ambiguous. Herein, a simple two-step strategy demonstrated to fabricate porous /CoFe2 O4 heterojunction for reaction. influence electronic structure interfacial effect on are investigated by constructing two different FeO6 octahedral configurations heterogeneous structures. optimal sample ZnFeCo-2 affords high photocurrent density 1.17 mA cm-2 at 0.5 V vs Ag/AgCl, which 3.2 times than that ZnFe (0.37 ). Meanwhile, also exhibits 97.8% Faraday efficiency CH3 OH HCHO, long-term stability over 40 h. Furthermore, functional theory calculations reveal heterostructured with favorable electron transfer effectively lowers adsorption, C-H bond activation, HCHO desorption energy relative pristine , resulting excellent efficiency.

Language: Английский

Citations

61
Nanoscale Double‐Heterojunctional Electrocatalyst for Hydrogen Evolution DOI
Yangyang Feng,

Yongxin Guan,

Enbo Zhou

et al.

Advanced Science, Journal Year: 2022, Volume and Issue: 9(18)

Published: April 24, 2022

Abstract The active sites and charge/mass transfer properties in electrocatalysts play vital roles kinetics thermodynamics of electrocatalysis, impose direct impacts on electrocatalytic performance, which cannot be achieved by a simplex structure. As prototype, the authors propose double‐heterojunctional nanostructure NiS 2 /Ni 3 C@C containing C Ni C/C heterojunctions as general model to optimize above issues boost performance. During thermal reorganization, situ reaction between nanoparticles carbon induces formation them constructs tightly contacted two kinds interfaces among three components. TEM XPS reveal intimately components as‐constructed interacted dual interfaces, further confirming porous nanostructure. Theoretical calculations uncover that electron density redistribution occurs at interface spontaneous from defected lower ΔG H* achieves concentrated interfacial charge density, favors simultaneous realization high catalytic activity rapid transfer. When applied for hydrogen evolution (HER), exhibits excellent HER durability all pH values. Profoundly, this special structure can provide new high‐performance beyond.

Language: Английский

Citations

58
Synergy in Au−CuO Janus Structure for Catalytic Isopropanol Oxidative Dehydrogenation to Acetone DOI
Meng Guo,

Peijie Ma,

Jiayi Wang

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(27)

Published: April 14, 2022

The controlled oxidation of alcohols to the corresponding ketones or aldehydes via selective cleavage β-C-H bond under mild conditions still remains a significant challenge. Although metal/oxide interface is highly active and selective, interfacial sites fall far behind demand, due large thick support. Herein, we successfully develop unique Au-CuO Janus structure (average particle size=3.8 nm) with an ultrathin CuO layer (0.5 nm thickness) bimetal in situ activation separation strategy. resulting prominently enhance isopropanol adsorption decrease energy barrier scission from 1.44 0.01 eV strong affinity between O atom H isopropanol, compared Au alone, thereby achieving ultrahigh acetone selectivity (99.3 %) over 1.1 wt % AuCu0.75 /Al2 O3 at 100 °C atmospheric pressure 97.5 conversion. Furthermore, structures supported on SiO2 , TiO2 CeO2 exhibit remarkable catalytic performance, great promotion activity achieved as well for other reducible oxides derived Fe, Co, Ni Mn. This study should help strategies maximized site construction optimization efficient activation.

Language: Английский

Citations

57
Metalloid‐Cluster Ligands Enabling Stable and Active FeN4‐Ten Motifs for the Oxygen Reduction Reaction DOI

Bifa Ji,

Jiali Gou,

Yongping Zheng

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(28)

Published: May 6, 2022

In nature, the oxygen reduction reaction (ORR) is catalyzed by cytochrome P450 (CYP) enzymes containing heme iron centers with an axial thiolate ligand (FeN4 -S), which are among most finely developed catalysts natural selection. However, exceptional ORR activity and selectivity of CYP originate from their non-rigid self-adaptive coordination network molecular ligands, sacrifices stability active motifs under electrochemical conditions. Here, a design strategy to circumvent this dilemma incorporating Fe-N4 into carbon matrices instead protein scaffold replacing stable tellurium cluster (Ten ) demonstrated. Theoretical calculations indicate moderate interaction between Fe 3d Te 5p orbitals once n > 2, allowing FeTe bond dynamically change its strength adaptively facilitate intermediate steps during process, renders FeN4 -Ten sites superior activity. This adaptive behavior mimics conformational dynamics enzyme reaction, but retains nature as heterogeneous catalyst. The experiments validate that as-designed catalyst characterized structure outperforms commercial Pt/C both on stability.

Language: Английский

Citations

57
Single-phase bimetal sulfide or metal sulfide heterojunction: Which one is better for reversible oxygen electrocatalyst? DOI
Jingjing Cai, Huijun Liu,

Yulin Luo

et al.

Journal of Energy Chemistry, Journal Year: 2022, Volume and Issue: 74, P. 420 - 428

Published: July 23, 2022

Language: Английский

Citations

56
Integration of partially phosphatized bimetal centers into trifunctional catalyst for high-performance hydrogen production and flexible Zn-air battery DOI Open Access
Miaosen Yang, Yifan Liu, Jiaqiang Sun

et al.

Science China Materials, Journal Year: 2022, Volume and Issue: 65(5), P. 1176 - 1186

Published: Jan. 13, 2022

Language: Английский

Citations

52
Gluing Ba0.5Sr0.5Co0.8Fe0.2O3−δ with Co3O4 as a cathode for proton-conducting solid oxide fuel cells DOI Open Access
Xuan Yang, Yanru Yin,

Shoufu Yu

et al.

Science China Materials, Journal Year: 2022, Volume and Issue: 66(3), P. 955 - 963

Published: Nov. 28, 2022

Language: Английский

Citations

45
MnO Enabling Highly Efficient and Stable Co‐Nx/C for Oxygen Reduction Reaction in both Acidic and Alkaline Media DOI
Cheng Chen,

Zi‐Jun Tang,

Jia‐Yi Li

et al.

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(1)

Published: Oct. 26, 2022

Abstract In situ growing transition metals on N‐doped carbon by atomic doping produces a class of promising alternatives to replace Pt‐based catalysts for redox reactions, yet still suffer from unsatisfactory activity and durability in acidic basic media. Herein, simple synthetic strategy fabricate an MnO modifying Co‐N x /C catalyst with high robust is presented. The interphase engineering well controls the Co N species matrix, affording material more pyridine graphite N; interaction between phase also discussed. Accordingly, obtained /C‐MnO exhibits excellent electrocatalytic properties towards oxygen reduction reaction, achieving half‐wave potential 0.87 0.66 V versus reversible hydrogen electrode 0.1 m KOH HClO 4 solutions, as only −16.9 −12.2 mV shift after 1000 cycles, respectively. This study provides insights into design noble‐metal‐free electrocatalysts perspective active sites carriers.

Language: Английский

Citations

43
Recent Progress of Non-Pt Catalysts for Oxygen Reduction Reaction in Fuel Cells DOI Open Access
Qing Chen, Zhou Zhang, Ruiquan Zhang

et al.

Processes, Journal Year: 2023, Volume and Issue: 11(2), P. 361 - 361

Published: Jan. 23, 2023

In recent years, non-Pt-based ORR catalysts have been developing rapidly and achieved performance comparable to or even surpassing Pt precious metal in specific reactions, offering new possibilities for Pt-based catalyst replacement showing great promise application. This paper reviews the research progress of fuel cell catalysts. The latest SACs (including single active site SACs, multi-metal noble SACs), non-metallic catalysts, alloy-based high-entropy alloy other are presented detail. discusses detail synthesis methods, characterization means, optimization performance, application prospects these addition, this review details excellent terms compositional structural controllability, electrical conductivity, chemical stability, as well their ability exhibit activity that commercial Pt/C field is full opportunities challenges. summary, cells show potential ORR. With continuous improvement preparation technologies, broad market prospects. development trend non-precious reviewed.

Language: Английский

Citations

35