ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Liang Ding,Roujia Zhang,Peng Zhao,Changsheng Qu
Based on the remediation challenges and practical needs of trichloroethylene (TCE)-contaminated groundwater, this study prepared an Ni-based composite electrode, Pd/Ni(OH) 2 /Ni foam (NF), and evaluates its electrocatalytic degradation effect on TCE in a groundwater environment. Under an applied voltage of –1.3 V versus Ag/AgCl, the TCE removal rate reaches 95% after 3 h of electrolysis. The introduction of Ni(OH) 2 nanoarrays accelerates the electron transport process, shortens the ion transport distance, and significantly increases the electron density of Pd. Furthermore, TCE is rapidly reduced by adsorbed hydrogen radicals on the Pd surface, and the ethane conversion rate reaches 62%. The experimental results show that the electrode can maintain a strong electrocatalytic activity over a wide pH range (3–9) and that it is not affected by common anions, such as Ca 2+ , HCO 3 - , SO 3 2- , or Cl - , in groundwater. Pd/Ni(OH) 2 /NF exhibits a high reactivity after six cycles of use. The remediation mechanism is studied by combining the microscopic characterization of materials, electrochemical activity testing, and process product identification, which provides an effective way of completely degrading chlorinated hydrocarbon pollutants in natural groundwater environment.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Xingnian Duan,Jianmei Cen,Xiaoyu Qiu,Xixiang Liu
The development of high-performance and cost-effective electrocatalysts for oxygen evolution reactions (OER) is key to renewable energy conversion and storage technologies. In this paper, a hierarchical Co(OH) 2 -MoO 3 nanosheets with petal-like architecture was prepared by a simple one-step hydrothermal method using ZIF-67/NF as a precursor, and it was used as a direct electrocatalyst for OER. Notably, this petal-like Co(OH) 2 -MoO 3 /NF layered nanosheets not only prevent the agglomeration of nanostructured material , but also facilitate the complete penetration and diffusion of electrolyte. In addition, due to the strong electronic interaction between Co(OH) 2 and MoO 3 in the Co(OH) 2 -MoO 3 /NF system, Co(OH) 2 -MoO 3 /NF exhibits excellent electrocatalytic OER performance. It has a low overpotential of 273 mV at 10 mA cm −2 and excellent stability. This study provides a simple and effective strategy for the rational design and structural evolution of MOF-derived materials to achieve inexpensive and effective electrocatalysis.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Xinran Li,Yuwei Zhong,Habib Ullah,Jian Luo,Lee Li,Ghafar Ali,Alaa G. M. Osman,Xiujian Zhao,Yi Xie
The intrinsic structural lability and limited processability of inorganic halide perovskites heavily hamper their commercial applications. Herein, we develop a facile and scalable room-temperature (RT) water-based procedure for the synthesis of Na–Cu-codoped CsPbIxBr3–x-embedded Pb(OH)I (denoted as the Na–Cu–CsPbIxBr3–x@Pb(OH)I) composite to overcome the above-mentioned bottlenecks. Compared to Na doping, the codoping with Na and Cu leads to a slight shift of the photoluminescence (PL) peak position from ∼612 to 622 nm, increases the PL intensity by 32.5 times, and improves the PL quantum yield from 1% to 5%. Notably, the optimized Na–Cu–CsPbIxBr3–x@Pb(OH)I composite displays outstanding stability under various harsh environments such as soaking in RT water or hot water (up to 90 °C) and annealing at high temperature, which indicates that Pb(OH)I can act as an effective water-blocking and protective encapsulation layer. It is more interesting that the photoluminescence (PL) intensity of Na–Cu–CsPbIxBr3–x@Pb(OH)I can be significantly increased to 2.17 and 1.29 times after soaking the sample in RT water for 35 and 105 days, respectively, and 1.25 times even after immersing in hot water (90 °C) for 6 h, indicating an improved optical property. Meanwhile, the crystal structure and emission wavelength are maintained. The insight of this work is quite beneficial for designing highly stable inorganic perovskite-based nanomaterials for realization in light-emitting devices and other optoelectronic devices.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Zhaoli Liu,Jiahui Fu,Qianfen Xiao,Wei-Xian Zhang,Airong Liu
The reactivity of nanoscale zerovalent iron (nZVI) in practical application is influenced by ubiquitous humic acid (HA), with its structural evolution and synchronous hydroxyl radical (•OH) generation behaving as closely interrelated processes that govern contaminant fate under dynamic redox conditions. In this study, the influence of different HA concentrations on the structural evolution of nZVI, synchronous •OH generation, and arsenite [As(III)] sequestration was investigated. While HA did not alter the types of evolutionary products, it accelerated zerovalent iron (Fe0) corrosion. Extended X-ray absorption fine structure and density functional theory calculation revealed that adsorbed-HA extended the Fe–O bonds in the nZVI surface, causing the compact passivation layer to rupture and the inner Fe0 to expose. This structural destabilization, along with reduced nZVI aggregation induced by HA, promoted the continuous corrosion of Fe0. Furthermore, quantitative analysis by high performance liquid chromatography demonstrated that HA enhanced •OH production in the nZVI system by up to 7-fold, due to the increased Fe(II)/Fe(II)–HA concentrations in solution. In addition, rapid Fe0 corrosion facilitated more •OH-mediated oxidation of As(III) to arsenate [As(V)] at pH 6.0, whereas at pH 9.0, it resulted in faster As(III) sequestration by generating new adsorption sites and enhancing As–Fe coprecipitation. These findings provide valuable insights into the roles of HA in modulating nZVI performance in environmental applications and As(III) fate.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
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IF 21.1
Jie Liu,Xinru Wei,Shan Lu,Ningyuan Song,Yanru Liu,Shu Yang,Fangxu Dai,Yunmei Du,Lei Wang
How to skillfully enhance the OH - binding energy of the hydrophilic site to accelerate water decomposition and avoid OH - poisoning is a huge challenge for achieving efficient alkaline HER kinetics. Therefore, the Ru-Fe 2 P/Re 3 P 4 model was designed from the perspective of coordinating the binding energy and spillover path of OH - . Density functional theory (DFT) disclosed that Re and Ru atoms act as hydrophilic sites and hydrogen evolution sites, respectively, to synergistically promote alkaline HER. In addition, the Ru dopant reduced the water dissociation energy barrier by enhancing the OH - binding energy of the Re hydrophilic sites. Meanwhile, Fe atoms with stronger OH - binding energy exhibited the OH - detoxification effect by promoting the OH - dynamic spillover from the Re sites. Given these, a unique Ru-ReFeP/IF-Q electrode was prepared by the ‘vapor phase phosphorization-quenching Ru doping’ strategy. As anticipated, the Ru-ReFeP/IF-Q electrode, driven by the Re-Ru-Fe alkaline hydrogen evolution reaction (HER) mechanism, only requires an overpotential of 172 mV at the industrial-level current density of 1 A cm −2 . The reinforced signal peaks attributed to Ru-H and Fe-OH species in the in-situ Raman spectra confirmed the detoxifying effect of Fe sites in avoiding OH - poisoning at hydrophilic active sites. In summary, this work provides a novel design idea for accelerating alkaline HER kinetics from the perspective of synergistically optimizing the binding energy and spillover path of OH - byproducts.
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Catalysts
·
2024
·Vol. 14
·期 3
·183
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IF 3.8
Jiarong Ma,Run Zhou,Yu Tu,Ruixin Ma,Daimei Chen,Hao Ding
Ni3Si2O5(OH)4rods (NS) were synthesized via a hydrothermal method, employing natural wollastonite as a template. The hierarchical Ni3Si2O5(OH)4rods exhibited vertically oriented nanosheets, resulting in a substantial increase in the specific surface area (from 2.24 m2/g to 178.4 m2/g). Subsequently, a CdS/Ni3Si2O5(OH)4composite photocatalyst (CdS/NS) was prepared using a chemical deposition method. CdS was uniformly loaded onto the surface of the Ni3Si2O5(OH)4nanosheets, successfully forming a heterojunction with Ni3Si2O5(OH)4. The CdS/NS photocatalyst in the presence of lactic acid as a sacrificial agent demonstrated an impressive H2production rate of 4.05 mmol h−1g−1, around 40 times higher than pure CdS. The photocorrosion of CdS was effectively solved after loading. After four cycles, the performance of CdS/NS remained stable, showing the potential for sustainable applications. After photoexcitation, electrons moved from Ni3Si2O5(OH)4to the valence band of CdS, where they interacted with the holes via an enhanced interface contact. Simultaneously, electrons in CdS transitioned to its conduction band, facilitating hydrogenation. The enhanced performance was attributed to the improved CdS dispersion by Ni3Si2O5(OH)4loading and efficient photogenerated carrier separation through the heterojunction formation. This work provides new perspectives for broadening the applications of mineral materials and developing heterojunction photocatalysts with good dispersibility and recyclability.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
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IF 3.8
Tianbiao Zeng,Jie Lin,Biao Wang,Binbin Guo,Yihong Ding,Chang Q. Sun
In an era where clean energy and sustainability are prioritized, water electrolysis for hydrogen production has become a focus of research. Ti-6Al-4 V alloy (Ti64) may support the catalyst due to its high mechanical strength, electrical conductivity, and resistance to alkali corrosion. However, its poor catalyst adhesion limits its application. Herein, a carbon layer was deposited on Ti64 (Ti64/C), before depositing the Co0.8Ni0.2(CO3)0.5(OH)·0.11H2O (CNCH) nanoneedles. The porous Ti64-H/C/CNCH electrode performs exceptionally well in the oxygen evolution reaction, achieving a current of 10 mA cm–2 at an overpotential of 131 mV with 90% IR compensation. Furthermore, the cell achieves a density of 10 mA cm–2 at 1.83 V and slow degradation after 45 h of continuous operation under overall water-splitting conditions. This study presents a method of fabricating high-performance water electrolysis electrodes by coating the metal surface with a carbon layer under the catalysts.
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Advanced Energy Materials
·
2023
·Vol. 14
·期 3
·2303063
·
IF 27.8
Junhua Zhou,Chi Zhang,Chuan Xie,Huimin Wang,Haining Fan,Yanpeng Guo,Chao Wang,Fan Chen,Yichun Ding,Qiyao Huang,Zijian Zheng
Lithium–sulfur battery (LSB) possesses high theoretical energy density, but its poor cycling stability and safety issues significantly restrict progress in practical applications. Herein, a low-cost and simple Al(OH) 3 -based modification of commercial separator, which renders the battery outstanding fire-retardant and stable cycling, is reported. The modification is carried out by a simple blade coating of an ultrathin composite layer, mainly consisting of Al(OH) 3 nanoparticles and conductive carbon, on the cathode side of the separator. The Al(OH) 3 shows strong chemical absorption ability toward Lewis-based polysulfides and outstanding fire retardance through a self-decomposition mechanism under high heat, while the conductive carbon material acts as a top current collector to prevent dead polysulfide. LSB using the Al(OH) 3 -modified separator shows an extremely low average capacity decade per cycle during 1000 cycles at 2 C (0.029%, 1 C = 1600 mA g −1 ). The pouch cell exhibiting high energy density (426 Wh kg −1 ) can also steadily cycle for more than 100 cycles with high capacity retention (70.2% at 0.1 C). The effectiveness and accessibility of this Al(OH) 3 modification strategy will hasten the practical application progress of LSBs.
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RSC Advances
·
2021
·Vol. 11
·期 57
·36166-36173
·
IF 3.361
Lixiao Han,Cong Peng,Jinming Huang,Shengyao Wang,Xiaohu Zhang,Hao Chen,Yi Yang
Planting highly efficient and low-cost Ni-based noble-metal-free active sites on semiconductors is of great significance in the field of photocatalysis. Herein, taking wide visible-light-responsive 2D C3N5 as a model semiconductor, an impressive near-zero-cost 2D S-doped nickel hydroxide (S–Ni(OH)2) is grown on C3N5 ultrafast within 30 min under ambient conditions by facile reaction between extremely low-cost Ni(NO3)2 and Na2S in aqueous solution. The fabricated 2D S–Ni(OH)2–C3N5 hybrid exhibits enhanced photocatalytic performance for both H2 production from water and NO removal for air purification. The H2 production rate on S–Ni(OH)2–C3N5 is ∼7 times higher than that of Ni(OH)2–C3N5 and even slightly higher than that of Pt–C3N5, demonstrating its potential as a candidate for noble metal catalysts like Pt. In particular, an apparent quantum yield (AQY) value of 30.9% at 420 nm for H2 production is reached on 1.0 wt% S–Ni(OH)2–C3N5 due to quick internal charge transfer efficiency. In addition, ∼42% of NO can be purified in a continuous flow reaction system. This work affords a cost-efficient strategy to steer the photocatalytic property of Ni-based catalysts.
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PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Mingping He,Wanli Xu,Zhenqiang Dong,Yuechao Wu,Liang Lv
Carbon cloth (CC) is widely used as flexible substrate for supercapacitors , but its space utilization is low. In order to overcome this shortcoming, a new strategy was proposed to fill the gaps and voids in CC by anchoring polyaniline/phytic acid hydrogel (PAH) on CC. Then Co(OH) 2 was electrodeposited on PAH/CC to obtain flexible electrode for supercapacitor. Due to the high mass loading of Co(OH) 2 /PAH (9.83 mg cm −2 ), Co(OH) 2 /PAH/CC provided excellent areal capacitance of 8142.5 mF cm −2 at current density of 5 mA cm −2 . The symmetrical device demonstrated excellent energy density of 201.5 μWh cm −2 at power density of 3000 μW cm −2 , which is larger than those of most devices reported previously. This strategy of anchoring conductive hydrogel network in macroporous frame opens up a new way to fabricate flexible supercapacitor electrode with high areal capacitance and energy density.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Lingxia Zheng,Lingtong Guan,Jianlan Song,Huajun Zheng
The rational structure design of nanohybrids plays a vital role in the supercapacitor performance of electrode materials . Herein, a novel sandwiched structure based on Ni(OH) 2 and amino-functionalized graphene quantum dots (Ni(OH) 2 /af-GQDs) is prepared via a facile green strategy. The layered Ni(OH) 2 nanosheets are spaced by amino groups from af-GQDs to afford a sandwiched configuration with an enlarged pore diameter of 1.8 nm, which leads to the decrease of random aggregation of Ni(OH) 2 nanosheets and dramatically facilitates the ion transport, thus contributing to the increased surface area and improved electrochemical capacitance . Besides, the introduction of af-GQDs leads to enhanced electrical conductivity and better cycling stability as well as contributing additional electrochemical double-layer capacitance, resulting in an outstanding specific capacitance of 2653 F g −1 at 1 A g −1 . An asymmetric supercapacitor (ASC) based on Ni(OH) 2 /af-GQDs and electrochemical-exfoliated graphene (EG) is assembled, exhibiting a wide potential window range, a high energy density , and an excellent cycling stability with 90.15% capacitance retention. These results definitely demonstrate the great potential of Ni(OH) 2 -based hybrid materials in the development of high-performance supercapacitors .
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 22
·11163-11170
·
IF 8.867
Lifeng Hang,Yiqiang Sun,Dandan Men,Shengwen Liu,Qian Zhao,Weiping Cai,Yue Li
Hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres were prepared by two-step treatment (annealing at 600 °C in an Ar atmosphere and then at 250 °C in air) of PS@Co(OH)2 core–shell structures templated from PS microspheres without any modification. In 1 M KOH, such hollow nanospheres showed an overpotential of 352 mV at a benchmark oxygen evolution reaction (OER) current density of 10 mA cm−2, which was lower than that of RuO2 (364 mV), Co3O4 hollow nanospheres (410 mV) and C-Co/Co3O4 nanoparticles (462 mV). Importantly, the C-Co/Co3O4 hollow spheres exhibited a small onset potential (1.49 V) due to their more active sites, higher electrical conductivity, larger specific surface area, and excellent electron and ion diffusion permeability. This work provides a strategy to design and fabricate earth-abundant, low-cost electrocatalysts for water splitting in practical applications.
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