Junhu Wang

Junhu Wang
Dalian Institute of Chemical Physics | DICP

PhD

About

227
Publications
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Introduction
1) advanced ex/in-situ/operando 57Fe/119Sn Mössbauer techniques and their applications to novel functional materials and deep space exploration, 2) highly stable and efficient catalysts towards energy and environmental researches, and 3) world-largest online scientific specific database as well as publication of reference and data journal for timely providing information & knowledge service to the worldwide Mössbauer community.

Publications

Publications (227)
Article
Magnetic field enhanced electrocatalysis has recently emerged as a promising strategy for the development of a viable and sustainable hydrogen economy via water oxidation. Generally, the effects of magnetic field enhanced electrocatalysis are complex including magnetothermal, magnetohydrodynamic and spin selectivity effects. However, the exploratio...
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The development of highly efficient and cost-effective electrocatalysts for the sluggish oxygen evolution reaction (OER) remains a significant barrier to establish effective utilization of renewable energy storage systems and water splitting to produce clean fuel. The current status of the research in developing OER catalysts shows that NiFe-based...
Article
Due to the low activity of bulk Fe5C2 catalyst in the hydrogenation of dimethyl oxalate to ethanol, a supported Fe5C2 catalyst was designed and prepared with mesoporous carbon as the carrier. For a comparison, two iron carbide catalysts supported on activated carbon and microporous carbon were also prepared. Based on the characterization results of...
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Perchlorate (ClO4⁻) and possibly chlorate (ClO3⁻) are considered to be ubiquitous on Mars1–5, and the ClO3⁻/ClO4⁻ abundance ratio has critical implications for the redox conditions6,7, aqueous environments8,9 and habitability on Mars¹⁰. However, factors that control the ClO3⁻/ClO4⁻ generation ratios are not well established. Here we expose mixtures...
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Cation- and anion-substituted hydroxyapatites (sHAPs) supported gold catalysts showed strong metal-support interaction (SMSI) under oxidative atmosphere. Mg- and Ce-substituted sHAPs stabilized Au clusters and imparted positively charged Au. The Au on these sHAPs became more positively charged upon formation of the oxidative SMSI. The catalytic act...
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Iron-nitrogen-carbon (Fe-N-C) catalysts for oxygen reduction reaction (ORR) are promising candidates in fuel cell devices but the poor stability remains a grave challenge. The elimination of demetallation is pivotal for extending the life but still incapable due to the ambiguous mechanism. Herein, we show that the structure of FeN4 site and its str...
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Due to their fascinating structures and heterometallic synergistic effects in catalysis, heterometallic clusters with metal–metal (M–M) bonds have attracted the interest of chemists for decades. However, understanding of the chemistry of M–M bonds that involve f-block elements, such as uranium, is significantly less developed compared with that of...
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Single-atom catalysts have recently attracted considerable attention because of their highly efficient metal utilization and unique properties. Finding a green, facile method to synthesize them is key to their widespread commercialization. Here we show that single-atom catalysts (including iron, cobalt, nickel and copper) can be prepared via a top-...
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Iron nitrides are key intermediates in biological nitrogen fixation and the industrial Haber–Bosch process, used to form ammonia from dinitrogen. However, the proposed successive conversion of nitride to ammonia remains elusive. In this regard, the search for well-described multi-iron nitrido model complexes and investigations on controlling their...
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The web-accessible online database (WAD) of the Mössbauer Effect Data Center (MEDC) is one of the worldwide available information services provided by MEDC to the scientific community. It is based on the uniquely wide scope Mössbauer spectroscopy database that has been compiled and maintained by MEDC since the 1960’s. Following enhancements applied...
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Higher alcohols synthesis (HAS) from syngas is quite attractive but still challenging due to the unsatisfied product selectivity and stability. Here, we prepared a series of CoFe bimetallic carbide catalysts and investigated the evolution of active species. The catalysts reduced above 300 °C could ensure an adequate interdiffusion between Co and Fe...
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A novel heterogeneous catalyst [email protected]2 was successfully synthesized via facile hydrothermal processes and identified as a superior peroxymonosulfate (PMS) activator for organic pollutants degradation under visible light irradiation. The MoS2 nanosheet is uniformly adhered to the surface of iron-based metal-organic framework Prussian blue...
Article
In situ/operando Mössbauer spectroscopy is one of the most powerful techniques to quantitatively monitor the coordination and electronic structure of Mössbauer isotopes (¹¹⁹Sn, ⁵⁷Fe, etc.) contained in heterogeneous catalysts under practical reaction conditions. To promote further progress in identifying the real structure of catalytic site(s) and...
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The production of high-value chemicals by single-atom catalysis is an attractive proposition for industry owing to its remarkable selectivity. Successful demonstrations to date are mostly based on gas-phase reactions, and reports on liquid-phase catalysis are relatively sparse owing to the insufficient activation of reactants by single-atom catalys...
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Cubic perovskite oxides usually suffer from delamination and Sr²⁺ segregation for catalyzing oxygen evolution reaction (OER) at the anodes of solid oxide electrolysis cells (SOECs). It is crucial to develop alternative and efficient anode materials for SOECs. Herein, a series of novel Y0.95-xSrxCo0.3Fe0.7O3-δ (YSCF-x) orthorhombic perovskite oxides...
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Fe-N-C catalysts are promising candidates to replace expensive and scarce Pt-based catalysts for oxygen reduction reaction (ORR) in fuel cell devices. Herein, simultaneous improvement of activity and stability of Fe-N-C is achieved through exposing active sites via a surface modification strategy. Concretely, EDTAFe groups are anchored on the exter...
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As a type of important non-precious catalyst for the oxygen reduction reaction (ORR), the regulating role of a metal centre in metal-macrocycles and other complexes for activity has been extensively studied. However, a common guideline to explain the effect of peripheral coordinated-ligands has not been reached. Herein, a series of organic iron com...
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N-doped carbon materials as catalyst supports have shown great superiority because of rich porosity, tunable metal-support interaction and electronic promotion effect. Controllable fabrication of carbon materials with specific morphology and different configurations provides wider possibilities for applications in catalysis. Herein, N-doped carbon...
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Supported gold nanocatalysts have been treated as extraordinarily effective catalysts in heterogeneous catalysis field. However, their poor thermodynamic stability in reactions at elevated temperature remains to be resolved for practical applications. The strong metal-support interaction (SMSI), a vital concept in chemical industry, can be applied...
Article
Ferrihydrite (Fh) has been demonstrated acting as a hole‐storage layer (HSL) in photoelectrocatalysis system. However, the intrinsic structure responsible for the hole storage function for Fh remains unclear. Herein, by elaborately dehydrating the Fh via a careful calcination, the essential relation between the HSL function and the structure evolut...
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The [FeO6] polyhedral hydration structure of ferrihydrite is responsible for its hole storage function. With the continuous loss of three molecules of crystal water, the quantity of stored photogenerated holes for PEC water oxidation gradually decreases, accompanied by the destruction of the hydration structure. Abstract Ferrihydrite (Fh) has been...
Article
Well-defined carbon shells encapsulating CoFe2O4 deliver superior performance in catalytic PMS activation for organics degradation with a reaction rate constant of 0.269 min-1, 4.7 times the hollow CoFe2O4 and 2.7 times the solid carbon sphere encapsulated one. This is attributed to the comprehensive effects of the Co2+ and C[double bond, length as...
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The Mössbauer spectroscopy database compiled and maintained by the Mössbauer Effect Data Center (MEDC) is a unique, wide-scope Mössbauer-spectroscopy related information resource, which forms the basis of information services provided by the Mössbauer Effect Data Center to the worldwide scientific community. The Mössbauer Effect Reference and Data...
Article
The lack of model single-atom catalysts (SACs) and atomic-resolution operando spectroscopic techniques greatly limits our comprehension of the nature of catalysis. Herein, based on the designed model single-Fe-atom catalysts with well-controlled microenvironments, we have explored the exact structure of catalytic centers and provided insights into...
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Pure hematite nanorods and very long and thin cobalt-doped hematite nanorods (nanoneedles) were prepared by a combined precipitation and annealing method. The influence of the level of cobalt doping on different properties of hematite nanorods was investigated. Incorporation of cobalt in the form of low-spin Co³⁺ ions into the structure of hematite...
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The low efficiency of oxygen evolution reaction (OER) is regarded as one of the major roadblocks for metal-air batteries and water electrolysis. Herein, a high-performance OER catalyst of NiFe0.2 (oxy)hydroxide (NiFe0.2-OxHy) was developed through topotactic transformation of a Prussian blue analogue in an alkaline solution, which exhibits a low ov...
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Fe-based oxygen carries (OCs) have attracted wide attention due to the low cost and environmental compatibility for chemical looping methane partial oxidation. However, they usually suffer from low CH4 reactivity mainly due to insufficient synergy between catalytic CH4 activation and lattice oxygen mobility. In this work, Fe ions with different amo...
Article
Iron-based catalysts have been widely used to synthesize value-added hydrocarbons through CO2 hydrogenation. Fe carbide, Fe5C2, was proposed as the active phase responsible for C-C coupling during the chain growth. However, the reaction mechanism over iron-based catalysts is still under debate due to the presence of multiple phases of Fe species. I...
Article
Suppressing coke deposition over reduced oxygen carries, the key to break competing effect between oxygen supply and methane-to-syngas selectivity, is an important but challenging task for chemical looping partial oxidation technology. We report that A-site engineering of La1-xSrxFe0.8Al0.2O3 oxides significantly adjusts the oxygen capacity, which...
Article
Fe−N−C endowed with inexpensiveness, high activity, and excellent anti-poisoning power have emerged as promising candidate catalysts for oxygen reduction reaction (ORR). Single-atom Fe−N−C electrocatalysts derived from Fe-doped ZIF-8 represent the top-level ORR performance. However, the current fabrication of Fe-doped ZIF-8 relies on heavy consumpt...
Article
Catalytic conversion of ethanol to butanol is vital to bridge the gap between huge amounts of ethanol production, the limited blending ratio of ethanol in gasoline, and the outstanding performance of butanol. In this work, a highly active binary catalytic system of FeNiOx and LiOH was developed for upgrading of ethanol to butanol. After 24 h reacti...
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Supported gold catalysts play a crucial role in the chemical industry; however, their poor on-stream stability because of the sintering of the gold nanoparticles restricts their practical application. The strong metal-support interaction (SMSI), an important concept in heterogeneous catalysis, may be applied to construct the structure of catalysts...
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Nitrogen-doped graphene is a promising non-precious metal electrocatalyst for the oxygen reduction reaction (ORR). We report that distorted nitrogen-doped graphene layers encapsulating Fe3Co nanoparticles supported on carbon (Fe3[email protected]) display excellent activity toward ORR in alkaline media. Compared with a commercial Pt/C electrocataly...
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The effect of Lithium insertion in the crystal structure and magnetic properties of Barbosalite [Fe3(PO4)2(OH)2], a polymorph of iron hydroxyl phosphate synthesized from variable Fe precursor (Fe(II) and Fe(III)), have been investigated. Effect of distortion in the crystal structure of Barbosalite appeared with minimum lithium hydroxide (LiOH.H2O)...
Article
We report ionic self-assembly of positively charged FeIII meso-tetra(N-methyl-4-pyridyl) porphyrin (FeIIINMePyP) with negatively charged FeIII meso-tetra(4-sulfonatophenyl) porphyrin (FeIIITPPS4), leading to the formation of flower-like nanostructures composed of unprecedented three-dimensional (3D) entangled chains of porphyrin dimers. Molecular d...
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Monodisperse gold particles (ca. 2 nm) were prepared and deposited on various supports (SiO2, Al2O3, HAP, MgAl2O4 and MgO). The acid/base properties of supports were characterized by NH3 and CO2 sorption. The size of the gold nanoparticles spans in the 1.7–6.5 nm mean diameter range after calcination as determined from TEM measurements. The amounts...
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we first report the high spin Co-Fe Prussian blue analogue (Co-Fe PBA) as highly efficient Fenton-like catalyst for sulfate radical (SO4•-) production. Our experiments and density functional theory (DFT) calculations...
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The oxygen evolution reaction (OER) plays a critical role for efficient conversion and storage of renewable energy sources, whereas the active sites for the most representative electrocatalysts, Ni-Fe compounds, remain in debate. In this work, we have developed polymeric carbon nitride (PCN) with atomically dispersed N-coordinated Ni-Fe sites to in...
Article
The catalytic hydrodeoxygenation (HDO) of lignin-derived phenolic compounds is a critical step in the upgrading of bio-oil. Here, bimetallic Ni-Fe nanoparticles supported on mesoporous carbon spheres (MCSs) were fabricated and applied in HDO of phenol. In comparison with monometallic Ni and Fe catalysts, the bimetallic Ni-Fe catalyst exhibited bett...
Article
Chemical looping partial oxidation of CH4 is a promising method to produce syngas with suitable H2/CO ratio, and avoiding risk of explosion and expensive air separation plant. However, regeneration of reduced OCs by O2 usually leads to the enrichment of surface electrophilic O2- or O- species thus the CO2 formation and the decrease in total CO sele...
Article
Simple-controlled synthesis of multiple porous and monodisperse cobalt-iron oxides were realized by varying the prepared conditions via a template-assisted glycol solvothermal process. The obtained materials were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Mössbauer spectroscopy and nitrogen a...
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Controllable synthesis of metal−organic frameworks (MOFs) with well-defined morphology, composition and size is of great importance towards understanding their structure-property relationship in various applications. Herein, we demonstrate a general strategy to modulate the relative growth rate of the secondary building units (SBUs) along different...
Article
A facile "one‐pot" method to synthesize the Fe‐Nx‐CNTs/rGO catalyst by using melamine and FeCl2•4H2O as low‐cost precursors is reported. The 3‐dimensional porous structure and the dispersion of precursor were completed at the same time. Suitable precursor and concentration selection not only solved the aggregation of graphene but also improved its...
Article
Ultrasmall metal clusters have attracted great attention owing to their superior catalytic performance and extensive application in heterogeneous catalysis. However, the synthesis of high-density metal cluster is very challenging due to their facile aggregation. Herein, one-step pyrolysis was used to synthesize ultrasmall cluster and single-atom Fe...
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Methane-to-syngas conversion plays an important role in industrial gas-to-liquid technologies, which is commercially fulfilled by energy-intensive reforming methods. Here we present a highly selective and durable iron-based La0.6Sr0.4Fe0.8Al0.2O3-δ oxygen carrier for syngas production via a solar-driven thermochemical process. It is found that a dy...
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Fenton-like process presents one of the most promising strategies to generate reactive oxygen containing radicals to deal with the ever-growing environmental pollution. However, developing improved catalysts with adequate activity and stability is still a long-term goal to realize their practical application. Herein, we demonstrate single cobalt at...
Article
Controlled silver chloride (0.01–0.50 mol%) and tin co-doped micro-spherical titania ([email protected]2) with enhanced visible range absorption is prepared through hydrothermal synthesis. Multi-element doped rutile TiO2 nanocrystalline electron transporting layer (ETL) in perovskite solar cell (PSC) is reported for the first time, which uplifts th...
Article
A series of RuSn/AC catalysts with 5% Ru and 1–6% Sn loadings were synthesized for converting concentrated (10 wt%) sugars to 1,2-propylene glycol (1,2-PG) and ethylene glycol (EG) in a semi-continuous autoclave reactor. The catalysts structure and the product distributions are found to be highly dependent on the tin loading. At tin contents below...
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Supported platinum-group metal (PGM) catalysts are widely used in many important industrial processes. Metal-support interaction is of great importance in tailoring their catalytic performance. Here we reported the first example of oxidative strong metal-support interactions (OMSI) between PGM and hydroxyapatite (HAP) which can be extended to PGM a...
Article
A series of TiO2 nanoparticles with different anatase/rutile ratio were prepared by peroxotitanium complex at low temperature (�200 �C). Our approach provides the notable advantage of a one-step reaction without any addition of solvents or pH-adjusting agents, which is green and energy-efficient. The structural, morphological, as well as spectrosco...
Article
Mössbauer spectroscopic, magnetic and photocatalytic investigations on bulk and supported tin or iron-based titania nanocomposites were reviewed. Following two efficient methods are used for preparing highly efficient tin or iron-based titania photocatalysts: (i) (M, Sn)TiO2 (where M = N and AgCl) nanocrystals were designed and produced by simple h...
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Mg2FeH6 with purity up to 94.5 wt.% was synthesized and its interaction with LiNH2 was investigated in this study. It was found that Li4FeH6, normally synthesized by hydriding the mixture of LiH and Fe under 700°C and 5.5 GPa H2 pressure, can be formed via ball-milling Mg2FeH6 and LiNH2 at ambient condition following the reaction of Mg2FeH6 + 4LiNH...
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A porous P-doped M/N/C electrocatalyst with high-surface-area (up to 1312 m² g⁻¹) was prepared by annealing a mixture of triphenylphosphine, polyaniline, phthalocyanine iron (II), and phthalocyanine cobalt (II). The synthesis involves hard templating with silica nanoparticles, followed by NH3 activation. Along with low metal loading (Fe loading = 0...
Article
While Fe-based oxygen carriers (OC) are regarded to be promising for chemical looping combustion (CLC), the decrease of CO2 selectivity during deep reduction process and the severe agglomeration of Fe2O3 often occur after multiple redox cycles due to the low oxygen mobility. Herein, Fe-substituted Ba-hexaaluminates (BaFexAl12–xO19, denoted as BFxA-...
Article
Ni-doped goethite (α-FeOOH) nanorods were synthesized from mixed Fe(III)-Ni(II) nitrate solutions with various Ni/(Ni+Fe) ratios (0, 5, 10, 20, 33 and 50 mol % Ni) by hydrothermal precipitation in a highly alkaline medium using the strong organic alkali, tetramethylammonium hydroxide (TMAH). Ni-doped hematite (α-Fe2O3) nanorods were obtained by cal...
Article
The near-UV and visible light induced interfacial electron transfer (IFET) process between aqueous solution of [Fe(bipy)2Cl2][FeCl4] complex and TiO2 NPs has been proved at first time and the photochemical products were mainly characterized by electronic absorption, Fe K-edge X-ray absorption fine structure, electron paramagnetic resonance and ⁵⁷Fe...
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Their wide availability in nature, low cost, high reactivity, and low toxicity make Fe-based catalysts versatile in various catalysis fields, including photocatalysis, Fenton-like reaction, electrocatalysis, Li-ion batteries (LIBs), Fischer–Tropsch synthesis (FTS), biomass conversion, N2O decomposition and etc. Mössbauer spectroscopy, a powerful te...