COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Jiajia Li,Jiaqi Qian,Xiaoyu Chen,Xiaoxi Zeng,Ling Li,Bo Ouyang,Erjun Kan,Wenming Zhang
A novel Co/Ni metal-organic framework (MOF)-derived three-dimensional (3D) nanoarchitecture in which graphene carbon-coated CoNi alloy nanoparticles grow on the tips of N-doped carbon nanotubes that are vertically-aligned on carbon nanofibers (Co/Ni@GC/NCNTs/CNFs) is fabricated. The Co/Ni@GC/NCNTs/CNFs electrode has a half-wave oxygen reduction reaction (ORR) potential of 0.80 V, a superior standing stability with 84.8% current retention after 175 000 s. The oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) reach a lower overpotential of 0.395 V and 0.15 V, respectively. Moreover, the resultant sample is an air cathode catalyst in a microbial fuel cell and indicates an utmost power density of 2100 ± 45 mW cm −2 , which is much better than that of the Pt/C electrode (1334 ± 61 mW m −2 ). The density functional theory calculation demonstrates that the designed Co/Ni@GC/NCNTs/CNFs catalyst can remarkably promote OER, ORR, and HER performance.
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Suwei Xia,Qixing Zhou,Ruoxu Sun,Lizhang Chen,Mingyi Zhang,Huan Pang,Lin Xu,Jun Yang,Yawen Tang
The ingenious design and feasible fabrication of affordable, active and robust electrocatalysts toward the oxygen reduction reaction (ORR) is imperative importance for the advancement of advanced sustainable energy technologies. The electronic structure modulation via the establishment of Mott- Schottky heterojunctions offers a powerful leverage to realize the boosted electrocatalytic intrinsic activity, yet remaining challenging. Herein, an ingenious self-sacrificial template strategy is developed for the fabrication of an advanced hybrid Mott-Schottky electrocatalyst composed of CoNi alloyed nanoparticles in-situ implanted within N-doped carbon nanotube/nanowire-integrated hierarchical superstructures (CoNi@N-CNT/NWs). The combinations of experimental and theoretical studies demonstrate that the rectifying contact of CoNi nanoalloys and N-CNT/NWs can induce the self- driven charge transfer across the Mott-Schottky heterojunctions, giving rise to the improved electron transfer rate, reconfigured charge distribution, and boosted intrinsic activity. Moreover, the “branches”/“trunk“- structured carbon substrates can offer the tight structural interconnectivity and highly accessible channels for active site exposure, thus dramatically facilitating the mass transfer during the electrocatalytic process. As anticipated, the as-prepared CoNi@N-CNT/NWs exhibit prominent ORR performance with a half-wave potential ( E 1/2 ) of 0.86 V and exceptional long-term stability in 0.1 mol L −1 KOH. The innovational manipulation of electronic state via the of Mott-Schottky heterojunctions can enlighten the rational design of electrocatalysts with excellent performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
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IF 9.7
Songjie Li,Tiantian Liu,Shuang Yu,Xiaomei Yu,Huijing Yang,Chengduo Wang,Jin You Zheng
Hydrogen production via electrocatalytic water splitting has garnered significant attention, due to the growing demand for clean and renewable energy. However, achieving low overpotential and long-term stability of water splitting catalysts at high current densities remains a major challenge. Herein, a CoP@CoNi layered double hydroxide (LDH) electrode was synthesized via a two-step electrodeposition process, demonstrating oxygen evolution reaction, with an overpotential (ƞ 400 ) of 373 mV and a Tafel slope of 64.2 mV/dec. Subsequently, a superhydrophilic CoP@CoNi LDH-Pt electrode was prepared using an in situ oxidation method, with Pt clusters anchored within the CoP@CoNi LDH for the hydrogen evolution reaction, with an overpotential (ƞ 400 ) of 119 mV and a Tafel slope of 33.6 mV/dec. The CoP@CoNi LDH-Pt||CoP@CoNi LDH system achieved a cell voltage of 1.96 V at 1000 mA/cm 2 , maintaining stable performance after water electrolysis for 160 h. These remarkable outcomes stem from the fast charge transfer, improved mass transfer, and superior stability of the catalysts. Heterostructure electrodes were constructed to optimize the electrocatalytic kinetics through strong interfacial electronic interactions, while superhydrophilic electrodes were fabricated to improve the mass transfer process at a high current density. Anchoring high-activity components in catalysts prevents their detachment during water electrolysis, enhancing the structural stability of the electrodes. This study provides a new approach for large-scale preparation of efficient water electrolysis catalysts and offers significant potential for industrial hydrogen production applications.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 16
·5579-5589
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IF 6.119
Qixiao Gai,Shoutian Ren,Xiaochun Zheng,Wenjun Liu,Quanli Dong
Transition metal co-catalysts exhibit considerable potential in the photocatalytic water splitting process, but their limited activity and poor stability inhibit their extensive application, and therefore effective schemes are required to further enhance their co-catalytic performance. In this article, 2D/2D C3N4/CdS heterogeneous photocatalysts are first synthesized, and then CoNi alloyed NPs are selectively loaded on their CdS nanosheets by a convenient photodeposition method. The CoNi loading amount and Co/Ni ratio are adjusted by the photodeposition time and precursor Co2+/Ni2+ ratio, respectively. Meanwhile, Co–S bonds are formed between CdS and CoNi NPs. Their optimal hydrogen evolution rate can reach up to 2936.65 μmol g−1 h−1, which is higher than that of C3N4/CdS with Co, Ni or Pt as co-catalysts (i.e. 844.59, 2385.96 and 2486.66 μmol g−1 h−1), respectively. The enhanced photocatalytic performance should be due to the following three points: (1) the formation of the 2D/2D C3N4/CdS heterojunction; (2) the optimized Gibbs free energy of the CoNi co-catalysts; (3) the formation of Co–S bonds between CoNi and CdS. Our work provides a cost-effective scheme to exploit stable and efficient photocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jihao Su,Yu Zhang,Yuntong Meng,Xiaohui Guan,Min Lu
Supercapacitors , with their potential to revolutionize energy storage and usage, are an encouraging electrochemical energy storage technology. In this field, metal-organic framework (MOF) is considered as an excellent precursor and self-sacrifice template for synthesizing high performance electrode materials. On the outside of CoNi-MOF hollow spheres, zeolitic imidazolate framework (ZIF-67) is epitaxially grown to form a hierarchical porous structure. Then, a bit of nickel ions are added for etching and precipitation reactions, so that the structure can be further processed. The specific capacitance of CoNi@ZIF-LDH composite can achieve 1488 F g −1 at a current density of 1 A g −1 , and it has complete reversibility after 3000 cycles (cycle efficiency is 83.87 %). In addition, the maximal energy density of CoNi@ZIF-LDH//AC HSC is 49.8 Wh kg −1 when the power density is 800 W kg −1 . Meanwhile, it shows remarkable cycle durability (the capacitance retention rate is 94.85 % after 5000 cycles). This unique electrochemical property is primarily related to the establishment of hierarchical porous structures and the subsequent structural change produced by the site-directed transformation strategy. The special structural design and optimization of MOF materials provide a more convenient, more expandable, and more promising new idea for preparing high-efficiency electrode materials.
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ACS Catalysis
·
2023
·
IF 12.9
Yun Wang,Mengting Chen,Kaiyue Zhang,Haimei Wu,Jiale Wang,Yuran Cheng,Yingxin Liu,Zuojun Wei
Highly efficient transformation of renewable biomass and its derivatives into high-value-added chemicals and biofuels over non-noble-metal catalysts is attractive but challenging. Herein, we developed non-noble CoNi alloy nanoparticles confined in N-doped porous carbon (CoNi@NC) via simple pyrolysis of the metal–organic framework (MOF) precursor at 900 °C under an inert atmosphere. The as-obtained CoNi@NC catalyst exhibited higher performance than monometallic Co@NC and Ni@NC catalysts in the reductive amination of levulinic acid (LA) with benzylamine to N-benzyl-5-methyl-2-pyrrolidinone (BMP) under mild conditions of 130 °C and 3 MPa H2 for 6 h, achieving a full conversion of LA and a ≥ 99% yield of BMP. Detailed characterizations substantiated that multifunctional support and the significant synergistic effect between Co and Ni markedly enhanced the catalytic performance. Furthermore, CoNi@NC manifested outstanding recyclability (reusable 20 cycles without loss of activity), which was attributed to the well-dispersed CoNi alloy nanoparticles confined in the N-doped porous carbon and the anchoring of N species to metal nanoparticles. Additionally, the resultant CoNi@NC catalyst can be successfully applied in the one-pot transformation of LA/esters with amines/nitroarenes/nitriles to the corresponding N-substituted pyrrolidones, as well as the reductive amination of other carbonyl compounds with benzylamine to form N-heterocyclic compounds. Moreover, CoNi@NC enabled us to catalyze the continuous reductive amination of LA with amines in a trickle-bed reactor, which is a more promising, efficient, highly atomically economic, and green synthetic methodology, and exhibited excellent stability during the reaction over 36 h.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 5
·1429-1442
·
IF 2.531
Wei Liguo,Chen Wei,Jia Chenyang,Yang Xiaochun,Yang Yulin,Dong Yongli,Liu Lilai,Song Weina
Nanoparticles of the bimetallic alloy CoNi wrapped in nitrogen-doped graphite-like carbon shells and dispersed on nitrogen-doped graphite-like carbon sheets (Co x Ni 1− x @NC) were synthesized by calcining CoNi metal–organic frameworks that were prepared through a facile solvothermal reaction using various raw-material molar ratios Co:Ni and CoNi:ethylenedinitrilotetraacetic acid. After depositing Co x Ni 1− x @NC for use as a counter electrode film in dye-sensitized solar cells, it was found that the electrocatalytic activity of the Co x Ni 1− x @NC counter electrode towards triiodide reduction could be optimized by simply tuning the molar ratios (Co:Ni and CoNi:ethylenedinitrilotetraacetic acid) appropriately during Co x Ni 1− x @NC synthesis. Cells that utilized a Co x Ni 1− x @NC counter electrode exhibited strong chemical-composition-dependent photovoltaic performance. Under optimal conditions, the Co x Ni 1− x @NC counter electrode presented an impressive energy conversion efficiency of 3.58%, suggesting that it is a highly promising counter electrode for application in dye-sensitized solar cells. This counter electrode has the advantages that it is considerably less expensive than a Pt counter electrode and that it provides the basis for the design and preparation of other inexpensive and efficient counter electrodes to replace Pt.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Hailong Gong,Xiaofeng Hou,Binrong Li,Siyu Shen,Chen Wang,Qinqin Ma,Tingting Liu,Xuedong Wang
The level of total antioxidant capacity (TAC) reflects the overall ability of food to resist oxidative damage, maintain quality and nutritional stability. In this work, we pioneered a Co Ni alloy-confined N-doped carbon nanozyme (CoNi@CNT-N/GO) with a self-cascade catalysis. Compared to other nanozymes, the synergistic effect of OXD and POD realized self-sustained generation of H 2 O 2 , eliminating the need of exogenous addition, and further decomposition of H 2 O 2 into ·OH and oxidizes colorless 3,3′,5,5′- tetramethylbenzidine (TMB) to blue oxTMB as an efficient catalyst. The integration of multiple components and the built-in unique mechanism enhance bienzymatic activity. A “Thing Identify” APP was utilized to construct a smartphone-based visualization platform, demonstrating satisfactory linearity (0.01–1.2 mM) and low detection limit (3.3 μM) in TAC detection of real-world foods. This platform yielded data comparable to those from commercially colorimetric kits. Overall, it proposes a novel idea for engineering multi-functional and non-additional H 2 O 2 nanozymes in on-site food-quality monitoring.
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