ChemSusChem
·
2025
·
IF 6.6
Zixuan Tan,Yihong Cai,Bo Yang,Hao Huang,Haijun Guo,Min Zhuang,Hui Luo,Qingwei Meng,Shaoqu Xie
Graphical Monohydric alcohols are a potential fuel, and herein, monohydric alcohols have been selectively synthesized from multicarbon sugars by modulating the electron distribution of Ru and enhancing the hydrodeoxygenation process of biomass. Ru-based catalysts are widely used in catalytic reactions, but the electron-deficient nature promotes strong decarbonylation, leading to complete deoxygenation during the conversion of polyhydroxy biomass. Despite extensive research, effectively suppressing this decarbonylation activity remains challenging. Herein, electron-rich Ru and electron-deficient Ni formed due to the electron migration of Ni → Ru have a synergistic catalytic effect, controlling the precise cleavage of C N bonds by Ru 0 and retaining most of the C O bonds. The amorphous Al 2 O 3 is sufficiently bound to the substrate to promote rapid hydrogenation. This modification effectively suppresses the intrinsic decarbonylation activity of Ru and improves selectivity for hydrodeoxygenation. Using carbohydrates as substrates, the Ru–Ni bimetallic catalysts preferentially promote the hydrodeoxygenation pathway, resulting in a significant increase in C3+ monohydric alcohol yields. This work presents a new strategy for modulating reaction pathways via electronic structure engineering, offering valuable insights into the potential of Ru–Ni systems for biomass conversion and sustainable alcohol synthesis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qi Li,Huiqing Liao,Donghua Wang,Shang Yang,Yi Zeng,Fazheng Qiu,Lijie Jiang
The breach of dielectric-magnetic properties severely impairs the impedance matching and microwave attenuation. Graphene, which possesses superior dielectric and conductive characteristics, has been recognized as a potential electromagnetic (EM) functional material. However, the lack of magnetic response undermines the dielectric-magnetic balance of graphene, eventuating the impedance mismatch and weak microwave attenuation. Modulating the EM parameters to stimulate microwave propagation and attenuation is an ingenious strategy for premium microwave attenuation materials. Herein, the controlled titration chemical reduction and annealing were engaged to facilitate the in-situ growth of Ni nanoparticles on reduced graphene oxide (rGO). The self-assembly Ni/rGO nanocomposites harbor the rich heterointerfaces and reticulum-like microporous to bridge the dielectric-magnetic gap and manipulate well-matched impedance matching. Correspondingly, the maximum reflection loss of −37.5 dB was performed at 2.0 mm, and the effective absorption bandwidth of 5 GHz was achieved within 1.6 mm. Theoretical simulation of radar cross-sectional (RCS) has been developed, and the prominent RCS reduction value of 25.68 dB·m 2 was obtained with the detection theta of 0°. This work is an exciting step forward in the potential for tailoring superior microwave absorption materials through the manipulation of the dielectric-magnetic balances.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Wei Jia,Qi He,Zhiqiang Guo,Xiang Wu
The development of electrode materials has become a top priority as the requirement of global energy. Two-dimensional Ni(OH) 2 nanomaterials hinder its application in supercapacitors due to its low conductivity and limited active sites.Herein, we synthesize Ni(OH) 2 @NiS composites by a two-step hydrothermal route. It increases the specific surface area of samples and improves the ion transport rate. The Ni(OH) 2 @NiS-2 product delivers a specific capacitance of 1778 F g -1 at 1 A g -1 and cycle stability (88% at 2 A g -1 after 10,000 times cycling). Furthermore, the asymmetric supercapacitor (ASC) achieves an energy density of 110.25 Wh kg -1 at 2700 W kg -1 . Also, the devices show stable cycling capability at extreme temperatures.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Zengguang Shi,Yukun Xiao,Mian Li,Jianfeng Cai,Yanmei Chen,Jun Jiang,Xiaoping Ouyang,Zhifang Chai,Qing Huang
Van der Waals (vdW) layered materials have gained significant attention owing to their distinctive structure and unique properties. The weak interlayer bonding in vdW layered materials enables guest atom intercalation, allowing precise tuning of their physical and chemical properties. In this work, a ternary compound, Ni x In 2 Se 3 (x = 0–0.3), with Ni randomly occupying the interlayers of In 2 Se 3 , is synthesized via an intercalation route driven by electron injection. The intercalated Ni atoms act as “anchor points” within the interlayer of In 2 Se 3 , which effectively suppresses the phase transition of In 2 Se 3 at elevated temperatures. Furthermore, the disordered Ni intercalation significantly enhanced the electrical conductivity of In 2 Se 3 through electron injection, while reducing the thermal conductivity due to the interlayer phonon scattering, leading to an improved thermoelectric performance. For instance, the thermoelectric figure of merit (ZT) of Ni 0.3 In 2 Se 3 increased by 86% (in-plane) and 222% (out-of-plane) compared to In 2 Se 3 at 500 °C. These findings not only provide an effective strategy to enhance the performance of layered thermoelectric materials but also demonstrate the potential of intercalation chemistry for expanding the application scope of van der Waals (vdW) layered materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Dexin Chen,Yunxuan Ding,Xing Cao,Licheng Sun
Electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) offers a sustainable pathway for biomass valorization and green H 2 generation, yet its multi-electron transfer process demands efficient catalysts to overcome kinetic bottlenecks. Herein, we demonstrate that the spatial configuration of Co species in Ni hydroxides (Ni(OH) 2 ) dictates alcohol oxidation activity by modulating interfacial electron transfer dynamics. Engineered heterostructured Co 3 O 4 -Ni(OH) 2 outperforms planar NiCo layered double hydroxide (LDH), achieving 106 % higher current density with nearly 100 % yields and Faradaic efficiencies of the target product. Experimental and theoretical results reveal that the heterointerface optimizes alcohol adsorption and accelerates electron transfer kinetics via interfacial charge distribution. Engineering of interfacial electronic properties enables the catalyst to be versatile for the electrooxidation of variant substituted alcohol substrates. Those insightful results establish a paradigm for catalyst design methodology in biomass upgrading through regulating charge transfer pathways.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Jing Zhang,Peiqi Shen,Yuchun Liu,Tianchen Wei,Xingwu Zhai,Baichuan Zhu,Jianrong Zeng,Kun Xu,Min Zhou
Lithium carbonate, the primary discharge product in Li–CO 2 batteries with high thermodynamic stability and a wide band gap, leads to significant electrochemical inertness, limiting efficiency and cycle life. The strongly delocalized p z orbital at a lower-energy HOMO level in Li 2 CO 3 causes weak coupling with the O-p z orbitals, increasing decomposition resistance owing to d-orbital degeneracy in high-local-symmetry catalysts. This study introduces metastable tetragonal-pyramidal nickel sulfide (tp-NiS) with low-symmetry NiS 5 coordination, breaking d-orbital degeneracy and bringing d z 2 , d xz , and d yz orbitals closer to the Fermi level. Enhanced orbital overlap with Li 2 CO 3 O-p z orbitals facilitates robust Ni–O bond formation. In situ spectroscopy confirms reversible Ni–O bond formation during cycling, ensuring electron transfer and complete Li 2 CO 3 decomposition. Conversely, weak interfacial interactions in octahedral NiS with highly symmetric local coordination only allow decomposition-resistant Li 2 CO 3 and interface passivation. Consequently, tp-NiS exhibits superior electrochemical performance, with the best reported reversibility and stability, a charge potential below 4.0 V, and 92.03% capacity retention after 1800 h. This metal redox-driven mechanism establishes a reversible geometric conversion pathway, emphasizing the critical role of symmetry-engineered Ni–O interactions in bifunctional catalysts.
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Energy Storage Materials
·
2022
·
IF 20.831
Tong Zhou,Xinrun Yu,Fan Li,Jianwei Zhang,Bowen Liu,Longlong Wang,Yuan Yang,Zhiwei Hu,Jun Ma,Chao Li,Guanglei Cui
Nickel-rich layered transition metal oxide is limited by the poor structural stability during cycling as cathode materials for next-generation lithium-based automotive batteries . In the past, the poor electrochemical performance was mainly attributed to cracks and formation of rock-salt phase on the particle surface at high potentials. Rarely is the effect of bulk phase structure evolution on properties discussed. Here, we report a bulk oxygen release induced dynamic accumulative electrochemical–mechanical coupling failure mechanism. Domain-like rock salt phases are generated due to the oxygen release and transition metals migration in the bulk region of LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) particles at the first cycle high cutoff voltage. Then, reversible compressive/tensile lattice strain alternately dominate around the domain boundary and accumulate with cycling, leading to capacity fading and becoming the origin of intracrystalline cracks. The results suggest that, in addition to the side effects from the surface, the structural transformation of the bulk plays an important role in the capacity fading. The stabilization of lattice oxygen in bulk region is a feasible solution to suppress the structural transition and the inhomogeneous stress distribution.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yuhua Xie,Yumei Feng,Shuyuan Pan,Haifeng Bao,Yingjie Yu,Fang Luo,Zehui Yang
The commercialization of water-splitting technology strongly relies on the stable and high-performance electrocatalyst for hydrogen and oxygen evolution reactions (HER-OER). In this work, the nickel dopants in IrRu alloyed electrocatalyst for acidic water splitting activity are investigated. The incorporation of nickel dopants induces more oxygen atoms coordinating with Ir/Ru facilitating the formation of *OOH species via nucleophilic attack by H 2 O. Additionally, a fast surface reconstruction is achieved due to the electrochemical dissolution of Ni dopants; as a result, more oxygen species are incorporated, evidenced by in situ Raman spectroscopy and electrochemical impedance spectroscopy. Therefore, the mass activity for Ni@IrRu is enhanced by threefold than commercial IrO 2 in acidic OER catalysis. Moreover, the nickel dopants balance the hydrogen binding strength; as a result, only 609 mV overpotential is demanded to reach 1 A cm −2 in acidic HER catalysis. The polymer electrolyte membrane water electrolyzer (PEMWE) test indicates only 1.87 V is required to attain 2 A cm −2 , 160 mV lower than Pt/C-IrO 2 revealing its potential application in PEMWE.
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Xia Wei,Tianyao Wang,Hongbin Dai,Song Li
The hydrazine oxidation reaction (HzOR) is critical for direct hydrazine fuel cells and presents a promising alternative to the kinetics-sluggish oxygen evolution reaction in water splitting. Engineering catalysts with high-density nanotwin structures has emerged as a compelling strategy to enhance catalytic activity. However, such catalysts have to be explored for HzOR applications. This work reports the successful synthesis of a porous Ni–Zn catalyst featuring high-density coherent nanotwins (NT-Ni-Zn). NT-Ni-Zn supported on Ni foam exhibited exceptionally high catalytic activity and stability toward the HzOR, achieving a current density of 212.4 mA·cm–2 at 0.04 V vs reversible hydrogen electrode and retaining up to 93.9% after 15 h of continuous electrolysis. In addition, hydrazine-assisted water electrolysis using NT-Ni-Zn/Ni foam as both the cathode and anode require only a cell voltage of 70 mV to reach 10 mA cm–2. The exceptional HzOR activity of the Ni–Zn catalyst is attributed to the presence of the nanotwin structure, which promotes a favorable d-band center position and facilitates strong hydrazine binding on the twinned surface. This study provides valuable insights into the development of nanotwin catalysts for HzOR advancement.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jia Lin,Shuting Wu,Chenyao Tang,Xiaohua Chen,Ying Zheng
The silicon- modified nickel oxide catalysts with the same compositions but distinct Ni-Si interactions were obtained via different synthesis routes and utilized for methane combustion under conditions of oscillating temperatures. For catalysts prepared by co-grinding, amorphous SiO 2 was dispersed on the surface of large NiO crystallites . During high-temperature calcination or reactions, the crystallization of SiO 2 , coupled with the sintering or decomposition of NiO crystallites , led to the inferior catalytic activity and stability. Interactions between Ni and Si species were enhanced in catalysts synthesized by precipitation. The Si species was incorporated into the NiO lattice to inhibit the growth of NiO crystallites and to generate nickel silicate species under thermal treatments. The small NiO crystallites provided more Ni 3+ and active oxygen species for methane activation and oxidation , while the bulk nickel silicate species played a pivotal role in improving thermal stability, conjointly provoking excellent catalytic performance in cyclic heating–cooling tests between 180 and 800 °C. This study offers new insights into the design of metal oxide composites for catalytic applications.
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ADVANCED MATERIALS
·
2023
·Vol. 36
·期 13
·2311553
·
IF 29.4
Ruyu Shi,Nengzhan Zheng,Haocheng Ji,Mengtian Zhang,Xiao Xiao,Jun Ma,Wen Chen,Junxiong Wang,Hui-Ming Cheng,Guangmin Zhou
Direct regeneration of spent lithium-ion batteries has received wide attention owing to its potential for resource reuse and environmental benefits. The repair effect of direct regeneration methods undergoing heterogeneous repair process is usually inferior, while homogenous repair process plays a vital role to achieve satisfactory repair results. However, the practical applications of current homogeneous repair methods are challenged by the complex operations and relatively high costs owing to the requirement of additional heating or pressurization. Herein, this work proposes a simple strategy to achieve homogeneous repair of spent cathode materials under relatively mild conditions by uniformly precoating lithium source at room temperature and atmospheric pressure. Followed by annealing, highly degraded LiNi 0.83 Co 0.12 Mn 0.05 O 2 with severe Li deficiency and irreversible phase transition is repaired to have an initial capacity of 181.6 mAh g -1 and capacity retention of 80.7% after 150 cycles at 0.5 C. The lithium source used in this strategy is from the spent lithium anode. Moreover, this strategy is suitable for the direct regeneration of various layer oxide cathode materials with different failure degrees. This work provides both theoretical guidance and practical examples for the straightforward, effective, and universally applicable direct regeneration methods.
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SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Yihan Zhang,Shihong Zhang,Yi He,Hongjie Li,Teng He,Yi Fan,Huili Zhang
Ni-B/B 4 C composite coatings on N80 steel were achieved by pulsed electrodeposition (PED). The optimal condition for obtaining composite coating is investigated via studying the effects of different content B 4 C on the performance of Ni-B/B 4 C coatings, including the surface morphology , microstructure, hardness and electrochemical properties . Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) were used to analyze the surface morphology, crystal morphology and element type and content of the composite coatings. The hardness of coatings was investigated by micro-hardness test. The electrochemical properties of coatings were demonstrated by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscope (SECM). Results show that the grain was uniformly deposited on the surface of N80 steel, and no pinholes and microcracks were captured. Besides, the average Vickers hardness of the Ni-B/B 4 C was the highest (1030.61 HV), and the average coefficient of friction (COF) is 0.22 (the average COF of Ni-B is 0.49). In 3.5 w % NaCl solution, Ni-B/B 4 C (2 g L −1 ) exhibits good corrosion resistance , with a corrosion voltage of − 0.30 − 0.010 + 0.010 V, and a corrosion current of − 1.15 − 0.220 + 0.219 μA.
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