DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 24
·8226-8237
·
IF 4.174
Chen Mu,Denys S. Butenko,Ievgen V. Odynets,Іgor V. Zatovsky,Junzhi Li,Wei Han,Nickolai I. Klyui
There is wide interest in developing efficient, robust and low-cost electrode materials for the electrolysis of water to produce clean hydrogen fuel. It is especially important to improve the performance and durability of electrocatalysts for the OER. Here we have shown that the transformation of nanoparticle (n-NNP) and crystalline (c-NNP) forms of mixed phosphate Na4Ni3(PO4)2P2O7 in highly alkaline solutions occurs along various routes and provokes the generation of 2D Ni(OH)2 nanosheets or stable core(phosphate)–shell(Ni(OH)2) particles, respectively. In both cases, in the carbon matrix (through chemical and electrochemical conversion of phosphate in situ during electrolysis in a 6 M KOH or NaOH solution) stable OER electrocatalysts with low overpotentials of 250–290 mV at a current density of 10 mA cm−2 were obtained. The best candidate for the OER process is core–shell particles, which maintain overpotentials of around 250 mV in 6 M KOH for more than 3 days. The activity enhancement can be attributed to the formation of abundant NiOOH nanoparticles on the shell surface due to improved lattice matching. This report discusses future prospects for the creation of core–shell particles to reduce the overpotential of durable electrocatalysts for the OER.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Wei Lai,Lihong Ge,Huaming Li,Yilin Deng,Bin Xu,Bo Ouyang,Erjun Kan
The electrochemical water splitting to produce H 2 in high efficiency with earth-abundant-metal catalysts remains a challenge. Here, we describe a simple “cyclic voltammetry + ageing” protocol at room temperature to activate Ni electrode (AC-Ni/NF) for hydrogen evolution reaction (HER), by which Ni/Ni(OH) 2 heterostructure is formed at the surface. In situ Raman spectroscopy reveals the gradual growth of Ni/Ni(OH) 2 heterostructure during the first 30 min of the aging treatment and combined with polarization measurements, it suggests a positive relation between the Ni/Ni(OH) 2 amount and HER performance of the electrode. The obtained AC-Ni/NF catalyst, with plentiful Ni–Ni(OH) 2 interfaces, exhibits remarkable performance towards HER, with the low overpotential of only 30 mV at a H 2 -evolving current density of 10 mA/cm 2 and 153 mV at 100 mA/cm 2 , as well as a small Tafel slope of 46.8 mV/dec in 1 M KOH electrolyte at ambient temperature. The excellent HER performance of the AC-Ni/NF could be maintained for at least 24 h without obvious decay. Ex situ experiments and in situ electrochemical-Raman spectroscopy along with density functional theory (DFT) calculations reveal that Ni/Ni(OH) 2 heterostructure, although partially reduced, can still persist during HER catalysis and it is the Ni–Ni(OH) 2 interface reducing the energy barrier of H∗ adsorption thus promoting the HER performance.
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高影响因子
SOLID STATE SCIENCES
·
2023
·
IF 3.5
Ningxia Li,Qi Luo,Meiyan Cui,Zhiying Zhao,Zhangzhen He
New fluorophosphate compounds H A 5 M 6 (OH) 4 F 4 (HPO 4 ) 8 ( A = K, Rb; M = Fe, Ga) were synthesized by a fluorine-rich hydrothermal method . These compounds crystallize in the monoclinic system with a P2 1 /n space group, exhibiting an open framework structure built by [PO 3 (OH)] groups, [MO 4 (OH)F], and [MO 4 F 2 ] octahedra, where ten-membered-ring channels, eight-membered-ring channels, six-membered-ring channels, and the linear M 3+ trimers are seen. The characterizations were carried out by powder XRD , EDS , FT-IR spectra, and magnetic measurements. The results confirmed that H A 5 Fe 6 (OH) 4 F 4 (HPO 4 ) 8 ( A = K, Rb) show a quite similar magnetic behavior, possessing an antiferromagnetic ordering at 14.7 K and 15.6 K, respectively. The changes of the magnetic entropy for such antiferromagnetic orderings can be estimated as ∼10.7 J mol −1 K −1 and ∼13.4 J mol −1 K −1 .
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yan Sang,Xi Cao,Lvxuan Wang,Gaofei Ding,Yingjie Wang,Deshuang Yu,Yanan Hao,Linlin Li,Shengjie Peng
Synthesis of highly efficient, non-noble and bi-functional electrocatalysts is exceedingly challenging and necessary for water splitting devices. In this work, three-dimensional spherical Ni(OH) 2 /NiCo 2 O 4 heterojunctions are prepared by a one-step hydrothermal method and the hybrids are explored as efficient electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline electrolyte via tuning different Ni/Co atomic ratios of heterojunctions . The optimized Ni(OH) 2 /NiCo 2 O 4 (S (1:1)) exhibits high electrocatalytic activity with an ultralow over-potential of 189 mV at 10 mA cm −2 for the HER. With regard to the OER, the over-potential of the as-synthesized S (1:1) heterojunction is only 224 mV at the current density of 10 mA cm −2 . The improved catalytic performance of the Ni(OH) 2 /NiCo 2 O 4 heterojunctions is attributed to the chemical synergic combining of Ni(OH) 2 and NiCo 2 O 4 , large specific surface area for exposing more accessible active sites, and heterointerface for activating the intermediates that facilitates electron/electrolyte transport. The prepared catalyst exhibits good durability and stability in HER and OER catalyzing conditions. This study provides a feasible approach for the building of highly efficient bifunctional water splitting electrocatalysts and stimulates the development of renewable energy conversion and storage devices.
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高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Longsheng Zhang,Qianwei Ding,Yunpeng Huang,Huahao Gu,Yue-E Miao,Tianxi Liu
The practical applications of transition metal oxides and hydroxides for supercapacitors are restricted by their intrinsic poor conductivity, large volumetric expansion, and rapid capacitance fading upon cycling, which can be solved by optimizing these materials to nanostructures and confining them within conductive carbonaceous frameworks. In this work, flexible hybrid membranes with ultrathin Ni(OH)2 nanoplatelets vertically and uniformly anchored on the electrospun carbon nanofibers (CNF) have been facilely prepared as electrode materials for supercapacitors. The Ni(OH)2/CNF hybrid membranes with three-dimensional macroporous architectures as well as hierarchical nanostructures can provide open and continuous channels for rapid diffusion of electrolyte to access the electrochemically active Ni(OH)2 nanoplatelets. Moreover, the carbon nanofiber can act both as a conductive core to provide efficient transport of electrons for fast Faradaic redox reactions of the Ni(OH)2 sheath, and as a buffering matrix to mitigate the local volumetric expansion/contraction upon long-term cycling. As a consequence, the optimized Ni(OH)2/CNF hybrid membrane exhibits a high specific capacitance of 2523 F g–1 (based on the mass of Ni(OH)2, that is 701 F g–1 based on the total mass) at a scan rate of 5 mV s–1. The Ni(OH)2/CNF hybrid membranes with high mechanical flexibility, superior electrical conductivity, and remarkably improved electrochemical capacitance are condsidered as promising flexible electrode materials for high-performance supercapacitors.
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高影响因子
Nanoscale
·
2018
·Vol. 10
·期 45
·21284-21291
·
IF 7.233
Jiguo Tu,Haiping Lei,Mingyong Wang,Zhijing Yu,Shuqiang Jiao
The electrochemical behaviors of the ultrashort nickel phosphite nanorods supported on reduced graphene oxide (Ni11(HPO3)8(OH)6/rGO nanorods), as a candidate for cathodic applications in aluminum-ion batteries, are firstly investigated. Ni11(HPO3)8(OH)6/rGO nanorods are synthesized by a facile solvothermal process. Ni11(HPO3)8(OH)6 and Ni11(HPO3)8(OH)6/rGO cathodes both possess very high initial discharge capacities of 132.4 and 182.0 mA h g−1 at a current density of 200 mA g−1, respectively. In addition, the long-term cycling stability of the Ni11(HPO3)8(OH)6/rGO cathode is further evaluated, exhibiting a discharge capacity of 49.2 mA h g−1 even over 1500 cycles. More importantly, the redox reaction mechanism of the Ni11(HPO3)8(OH)6 cathode for aluminum-ion batteries revealed that Ni11(HPO3)8(OH)6 is partially substituted with Al3+ to form AlmNin(HPO3)8(OH)6 and metallic Ni in the nanorod-like Ni11(HPO3)8(OH)6 cathodes during the discharge process. These findings are of great significance for the further development of novel materials for aluminum-ion batteries.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 6
·060538
·
IF 4.386
Jie Hu,Fei Yang,Changgan Lai,Helin Wang,Liu Nie,Jian Sun,Huan Zhou,Lixu Lei
Pb3(OH)2(CO3)2-acetylene black (BLC/AB) composite is successfully prepared by a simple and economical sonochemical method and employed as a negative additive for lead-acid batteries (LABs). The electrochemical measurements show that the obtained BLC/AB electrodes have a higher hydrogen evolution reaction (HER) overpotential compared to AB electrode. BLC/AB-2 and BLC/AB-4 battery deliver the excellent rate performance at 1C rate. What's more, acetylene black as nucleation centers of Pb3(OH)2(CO3)2 may considerably alleviate irreversible sulfation phenomenon of negative plate, thus enhancing the conductivity and extending the cycle life. Interestingly, the cycle life (1172) of BLC/AB-2 battery is 1.44 times that of the same amount of AB battery (814) at 1C rate. Therefore, the BLC/AB composite is a promising negative additive of LABs.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yan Chen,Chunli Hu,Zhi Fang,Yilin Li,Jianggao Mao
Birefringent materials capable of modulating the polarization of light have attracted intensive studies because of their wide utilization in optical communication and the laser industry. Herein, two new lead(II)-based cyanurates, namely, Pb(H2C3N3O3)X (X = OH, F), were synthesized by hydrothermal methods, and the first halogen-containing metal cyanurate Pb(H2C3N3O3)F was successfully obtained by the rational substitution of a homovalent anion. Pb(H2C3N3O3)X (X = OH, F) belong to space group P1̅, and their structures display a neutral [Pb(H2C3N3O3)X] (X = OH, F) layer. The Pb2+ ions in Pb(H2C3N3O3)(OH) are interconnected by hydroxyl groups and oxygen atoms of cyanurate anions into a 1D [PbO(OH)]− chain, whereas the Pb2+ ions in Pb(H2C3N3O3)F are interconnected by F– anions and oxygen atoms of cyanurate anions into a 2D [PbOF]− layer. The π–π interactions between adjacent hydroisocyanurate rings and the hydrogen bonds between neighboring neutral layers provide additional stability to the structures. Luminescent studies show that Pb(H2C3N3O3)(OH) and Pb(H2C3N3O3)F emit yellow-green and blue light, respectively. Theoretical calculations unveiled their birefringences of 0.079 and 0.203@1064 nm and their band gaps of 3.96 and 4.96 eV, respectively, for OH– and F– containing materials. Obviously, the substitution of OH– by F– with the largest electronegativity can simultaneously improve both the birefringence and band gap.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.7
Zunqiu Xiao,Huaying Wang,Ningyuan Cai,Yutong Li,Kejia Xiang,Wei Wei,Tao Ye,Zhongtai Zhang,Shitong Wang,Zilong Tang
Anti-perovskite materials such as Li 2 (OH)Cl have garnered considerable interest as solid electrolytes due to their numerous advantages. However, the low ionic conductivity of the orthorhombic Li 2 (OH)Cl near room temperature presents a significant challenge for the application. In this study, we intricately modulate the −OH content in Li 2 (OH)Cl through a controlled heat treatment process. This method effectively increases the cubic phase content and lowers the phase transition temperature, thereby enhancing the ionic conductivity at 30 °C by more than an order of magnitude. Theoretical calculations illustrate that the removal of −OH content significantly reduces the barrier for phase transition, leading to substantial alterations in the Li-ion transport pathway and migration barrier. Furthermore, LiHClO-600 demonstrates exceptional resistance to lithium reduction and is compatible with lithium metal and LiFePO 4 , rendering it a viable solid electrolyte for batteries. Both experimental findings and theoretical calculations cohesively highlight the pivotal role of −OH content in driving phase transition and facilitating Li-ion transport in anti-perovskite solid electrolytes, paving the way for their potential utilization in all-solid-state batteries.
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高影响因子
Nanoscale
·
2025
·
IF 5.1
Wei Zhao,Yuxiang Yang,Yanbin Li,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
The advancement of efficient photocatalysts is essential for tackling global energy and environmental issues. In this work, a unique sheet-on-sheet Cd(OH)2/CdS photocatalyst was synthesized via a facile solution strategy, demonstrating significantly improved photocatalytic performance for H2 generation and Cr(VI) reduction. The optimal 5% Cd(OH)2/CdS obtained an impressive H2 production rate of 3475 μmol·g-1·h-1 under visible light, marking a 6.3 times increase compared to CdS. Additionally, the kinetics of Cr(VI) reduction were markedly accelerated, with a rate constant of 0.2803 min-1, representing a 5.7 times improvement over pure CdS. Moreover, the 2D/2D Cd(OH)2/CdS photocatalyst exhibited exceptional stability, maintaining high photocatalytic activity over multiple reaction cycles. Experimental findings and DFT calculations revealed the charge transfer mechanism between CdS nanosheets and Cd(OH)2 cocatalyst. This work provides insights into designing high-performance CdS-based nanophotocatalysts for water splitting and environmental remediation.
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 5
·1-19
·
IF 2.4
Hu Xinyin,Xiao Guoqing,Chen Chunlin,Chen Chunyan,Zeng Xiang,Li Ruili,Yang Zhengwei
Recently, several emerging pollutants have caused increasing damage to aquatic ecosystems. Reducing antibiotic concentrations in water by visible light is one of the most promising strategies for sustainable development. Here, a Bi 2 S 3 /CeO 2 /Ni(OH) 2 Z-scheme heterojunction photocatalyst was prepared by the hydrothermal method, which could effectively utilize free radicals to degrade tetracycline. Ni(OH) 2 was used for co-catalysing in photodegradation experiments to improve electron transfer and enhance photocatalytic performance. The degradation rate of the Z-scheme heterojunction photocatalyst for 20 mg/L TC was 91.35% after reacting 60 min under visible light irradiation. Besides, it also investigated such operational parameters influencing the photocatalytic reaction as catalyst dosage, initial concentration of tetracycline hydrochloride (TC), and solution pH. Studies using free radical scavenging experiments and electron spin resonance (ESR) measurements demonstrated that hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ) both contributed to the photodegradation of TC. Finally, with high-performance liquid chromatography-mass spectrometry (LC-MS), potential degradation pathways of the intermediate products were logically inferred as well as the photocatalytic mechanism. The experimental results surface that the prepared Z-scheme heterojunction photocatalyst Bi 2 S 3 /CeO 2 /Ni(OH) 2 exhibits superior photocatalytic performance, offering a novel approach to addressing TC contamination in environmental settings. Graphical
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Kai Liu,Qingyi Zhang,Chengwei Wang,Lei Wang,Feng Chen
Organic–inorganic lead halide perovskite (MAPbX3, X = Cl, Br, I) single crystals exhibit superior optoelectrical and physical characteristics and have been developed in various optical and electrical applications. However, the poor stability against moisture and light remains the most critical demerit of perovskite materials. In this work, light- and waterproof MAPbBr3-MAPbBr3@PbBr(OH) core–shell single crystals were successfully synthesized by surface engineering-induced transformation from MAPbBr3 to MAPbBr3@PbBr(OH). In addition, an in situ electrode preparation method was developed to construct the Ag/MAPbBr3-MAPbBr3@PbBr(OH)/Ag structure during the crystal growing process. The thickness-adjustable MAPbBr3@PbBr(OH) shell can present dual shielding effects and not only sustains the MAPbBr3 single crystal core with the highest responsivity of 31 mA W1–, response time ∼47 ms, and a detection rate of 4.8 × 1011 Jones but also achieves the embedded MAPbBr3 nanocrystal with bright photoluminescence (quantum yield of 56.1%). Moreover, the similar MAPbCl3-MAPbBrnCl3–n@PbBr(OH) and MAPbI3-MAPbBrnI3–n@PbBr(OH) core–shell single crystals have been prepared, which also exhibit excellent photoresponsivity and high emission. This work provides an effective strategy for the fabrication of high-performance and environmentally stable photodetectors.
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高影响因子
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