NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 23
·11389-11397
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IF 3.925
Baoli Wang,Yuhao Huang,Yijing Ai,Yucen Yao,Fan Shi,Shiguan Xu,Zejun Zhang,Xianghui Wang,Wei Sun
Developing non-noble and high-performance electrocatalysts towards the hydrogen evolution reaction (HER) in both acidic and alkaline media remains a stern challenge. Herein, the composite of P-doped Mo2C and a hierarchically ultrathin N, P-doped carbon nanoribbon network (P-Mo2C/NPC) is proposed through a facile simultaneous phosphating-carbonization strategy, in which biomass and phosphomolybdic acid (PMA) were employed as the carbon precursor and metal precursor, respectively. The doping of the electronegative P heteroatom increases the active sites, weakens the Mo–H bond strength in the HER, and facilitates the electron transfer. Consequently, the synthesized catalyst exhibits good intrinsic activity towards the HER, and shows low overpotentials of 172 mV and 118 mV to afford the current density of 10 mA cm−2 in 0.5 M H2SO4 and 1.0 M KOH electrolyte, respectively. Furthermore, the synthesized catalyst can sustain 24 h with stable performance, which is greatly favorable for industrial applications. This work may shed some light on the rational design and manufacture of HER electrocatalysts with high compatibility to different electrolytic environments.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Lan Wang,Ning Gong,Zhou Zhou,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Developing highly efficient, durable and noble-metal-free electrocatalysts for hydrogen evolution reaction (HER) in a wide pH range is the key to achieve sustainable energy cycle. Modulating the electronic characteristics of catalysts is of great important to enhance their electrocatalytic performance. Herein, we successfully design a self-supported multi-element transition metal phosphide (V-CoP/Ni 2 P/NF) electrocatalyst by V-doping and interface engineering. According to DFT calculations, V dopants and the synergistic effect between CoP and Ni 2 P can bring optimal hydrogen/water adsorption free energies . Meanwhile, the 3D cross-linked network structure could expose abundant active sites and facilitate ions diffusion/electron transfer. As a result, the V-CoP/Ni 2 P/NF catalysts exhibit superior electrocatalytic activities with extremely low overpotentials of 20, 58 and 79 mV to deliver a current density of 10 mA cm −2 for HER in alkaline, neutral and acidic electrolytes, respectively. Moreover, they also display outstanding long-term stability. This electronic modulation strategy provides a promising pathway for energy-related catalysis processes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Kun Qian,Fang Fang,Yifeng E,Yao Xu,Xiyuan Tong,Peng Chen,Lu Han,Zhuozhe Li
One of the important factors determining the expansion of the application domain of direct methanol fuel cell (DMFC) is its energy density . The bismuth-nickel doped LTA zeolite was as-synthesized in hydrothermal condition and applied into the electrochemistry catalysis of methanol oxidation reaction (MOR) with high performance in the methanol concentration ranging from 0.5 M to 35 M without observed catalyst poisoning . A trace amount of Bi and Ni atoms are highly dispersed on the opening window of the zeolitic surface by the electrochemical rearrangement process. The surface of the LTA structure zeolite is a good carrier for the metal cations with Na cations which could be replaced in hydrothermal crystalline process while the inner direct pores provide a channel for CO gas to escape and prevent catalyst poisoning in electrochemistry progress. Through the comparative study with the Bi doped LTA, Ni doped LTA and the commercial Pt/C catalyst, the Bi and Ni doped LTA reveals higher performance in monatomic catalytic efficiency and electrochemical stability. And through the mutual interaction of diatomic, the doped zeolite material highly improves the energy density of methanol fuel cells and reduces the cost of the cells concerning the absence of noble metals.
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ELECTROCHIMICA ACTA
·
2022
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IF 7.336
Miaojing Pan,Wei Chen,Guangfu Qian,Tianqi Yu,Zhenglin Wang,Lin Luo,Shibin Yin
Exploiting highly efficient catalysts to treat wastewater containing urea via electrocatalytic oxidation is significant for environmental protection and energy requirements. Hence, a carbon-encapsulated Co 3 V decorated Co 2 VO 4 nanosheets catalyst (Co 3 V@C/Co 2 VO 4 ) is synthesized to accelerate urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). It displays low potentials of 1.31 V and −51 mV to drive ±10 mA cm −2 in 1.0 M KOH + 0.5 M urea solution for UOR and HER, respectively. Impressively, for urea-assisted water splitting, only 1.37 V is needed to deliver 10 mA cm −2 , and it can maintain at 100 mA cm −2 for 100 h without significant activity decay. The good performance is attributed to the heterojunction between alloy and metal oxide, as well as the carbon-encapsulating and distinctive nanosheets structure. This study provides a novel choice for developing low cost and high-performance bifunctional catalysts to deal with urea-contained wastewater and produce hydrogen.
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CHEMOSPHERE
·
2022
·
IF 8.943
Chengzhi Wang,Guanlan Wu,Xiaolin Zhu,Yi Xing,Xing Yuan,Jiao Qu
A hierarchically photocatalytic microbial fuel cell system (PMFC) coupled with TiO 2 photoanode and bioanode was established to enhance the power generation based on single-chamber MFC. Compared with the conventional anaerobic mode, oxygen in the solution could be utilized by the photoanode of PMFC to improve the removal of o-chlorophenol (2-CP). The maximum power densities were increasing from 261 (MFC) to 301 mW/m 2 (PMFC). The removal efficiency of 2-CP (5 mg/L) in PMFC was 76.20% and higher than that in MFC (19.33%) and by photocatalysis (49.23%). The electron-hole separation efficiencies were decreasing with the increasing of dissolved oxygen, causing a low efficiency of photocatalysis, due to the reduction of the current density of the systems. The abundance of Geobacter sp., PHOS-HE36 fam., and Pseudomonas sp. was increased with illumination, contributing to improve the electricity production and 2-CP degradation. The only detective intermediate of 1,2-dichlorobenzene in PMFC indicated that the microbes could regulate the degradation pathway of 2-CP in the coupling system. These findings provided an feasible method for the effective degradation of refractory organic compounds and simultaneous energy recovery by combining photocatalysis and microbial power generation.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Qiankun Zhang,Tao Shao,Yu Li,Dehong Bai,Ziyu Xue,Shijie He,Dongxia Zhang,Xibin Zhou
Control of the chemical composition and morphology of electrochemical nanocatalysts is a promising strategy to effectively promote electrocatalytic oxidation in direct methanol fuel cells (DMFCs). Here, we describe a general soft-template-directed one-pot synthesis for the formation of bimetallic mesoporous nanospheres (MNSs) with cylindrically open mesoporous nanochannels. Three-dimensional (3D) well-dispersed bimetallic PtPd MNSs were prepared through in situ co-reduction of Pt and Pd precursor on the soft-templating structural directing amphiphilic surfactant of bisoctyl dimethyl ammonium chloride (BDAC) under optimal reaction conditions without using any toxic organic solvent. Owing to the synergistic advantages in structure and composition, the as-prepared mesoporous morphology of the bimetallic PtPd MNSs has more active sites and accelerates electron/mass transfer. Especially, the Pt 1 Pd 4.8 MNSs possessed a mass activity of 3450 mA mg metal −1 and specific activity of 163.8 mA cm −2 , which are 6.63 and 20.76 times higher than commercial Pt/C (520 mA mg Pt −1 and 7.89 mA cm −2 ). Therefore, it shows outstanding catalytic activity and stability toward electrocatalytic oxidation of methanol under alkaline conditions.
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JOURNAL OF NANOPARTICLE RESEARCH
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2022
·Vol. 24
·期 3
·1-22
·
IF 2.533
Yang Chunyan,Xue Ziwei,Yin Hao,Lu Ke,Liu Wei
In this work, the photodegradation of methylene blue was investigated by constructing a novel photocatalysis reactor, which was filled with aqueous foam. Nanoscale TiO 2 particles were used as photocatalyst. In order to obtain stable foam phase, cetyl trimethyl ammonium bromide (CTAB) was used as the frother, and its suitable initial concentration in the feeding solution was 0.20 g/L. Under the suitable conditions of loading liquid volume 200 mL, initial concentration of TiO 2 nano-catalysts in the feeding solution 5.0 g/L, inner diameter of foam column 18 mm, aperture diameter of gas distributor 125 μm, and circulating velocity of bulk solution 500 mL/h, the maximum degradation percentage of methylene blue was 97.6 ± 1.2%. Atomic force microscopy (AFM) analysis suggested that the entrainment effect of rising bubbles and the circulation flow of bulk solution inside the aqueous foam did not cause the conspicuous aggregation of TiO 2 nano-catalysts under the suitable conditions, but their surface roughness decreased. Meanwhile, foam entrainment had not a significant impact on the polydispersity of TiO 2 nano-catalysts. In contrast to the photodegradation of methylene blue in aqueous solution, the photocatalysis process using aqueous foam is the intensity of light received by TiO 2 nano-catalyst increases, and irradiation period is less. This work is expected to provide new insight into the rational design of photocatalysis reactor, to facilitate the harmless treatment of dyestuff wastewater. Graphical abstract
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高影响因子
FUEL
·
2022
·
IF 8.035
Shuai Wang,Li-Hong Deng,Yi-Fei Du,Xian-Liang Song
Fast accessibility of oxygen reduction reaction (ORR) species to a catalyst surface with the efficient utilization of every catalytic site plays a critical role in catalysis. Therefore, engineering of the structure and morphology of catalyst supports to both anchor and expose catalytic sites at three-phase-boundaries, accelerating the mass transport of reaction-species through the active sites, can be regarded as one of the most prospective methods to promote the efficient utilization of every catalytic site, giving prominent cell performance. Herein, two series of oxygen reduction reaction catalysts are prepared: reduced graphene oxides (rGO) with different loading amounts of iron phthalocyanine TFePc/rGO-X (X = 1,2,3,4 and 5); and TFePc/rGO-3 that is intercalated by different amounts of carbon black TFePc/rGO/CB-Y (Y = 1,2,3,4 and 5). The catalytic activities and stabilities of these catalysts were evaluated by cyclic voltammetry and linear sweep voltammetry. As expected, the 3D rGO/CB/rGO network is demonstrated as a singular catalyst-loading platform, with interlayer spacing that could be elaborately tuned via a simple carbon black intercalation. This enables ORR-species to be efficiently transported to each catalytic site. Besides, the optimal catalyst of TFePc/rGO/CB-3 exhibits more positive ORR peak potential than Pt/C catalyst. More significantly, in a practical cell, the cell performances were highly consistent with ORR active and the first-best cell performance of 0.86 mWcm −2 in power density was achieved for TFePc/rGO/CB-3. This is mainly attributed to the synergistic effect of rGO and carbon black, as well as the π-π interaction between rGO and TFePc.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xiaoyun Zhang,Lili Song,Le Tong,Mengyuan Zeng,Yuqiao Wang
The imitation and exploration of natural structures and characteristics are the inspiration source for science and technology progress. Herein, we report a method for preparing CoP anchored carbon microtubes (CoP@BCMT) by continuous hydrothermal, carbonization and phosphorization processes using cattail fibers (CFs) as carbon sources. The surface hydroxyl (–OH) groups acted as the growth sites for CoP fixed and grew in special positions. Co was anchored to BCMT surface through –OH groups and C-O-Co bonds were formed between CoP and BCMT. Surface bonding can ensure the growth of CoP at specific sites. The ultra-thin carbon layer covered CoP was deposited by the deposition of suspended carbon during CFs carbonization. CoP size, dispersibility and adhesion were maintained well due to surface coating and bonding. C-O-Co bonds promoted electron transfer and optimized adsorption energy of hydrogen, which was evaluated by density functional theory calculations. CoP@BCMT exhibited a low overpotential of 49 mV at current density of 10 mA cm −2 and long-term stability for 72 h. We modified commercial carbon nanotubes with surface hydroxyl groups and then combined with CoP, which greatly improved the catalytic performance. This work provides us with ideas for learning and using biomass to prepare advanced catalysts.
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Materials Today Chemistry
·
2022
·
IF 7.613
M. Wang,Y. Chen,T. Li
Electrocatalytic water splitting is a promising method for hydrogen production, so the development of the efficient and stable catalysts for hydrogen evolution reaction (HER) is quite important in alkaline media. In this study, cobalt-iron-nickel phosphide nanoparticles (CoFeNiP/NF) were prepared on the nickel foam substrate, where Ni 12 P 5 can be controllably generated by introducing Co dopants while only Ni 3 P was observed without adding Co. Also, the introduction of Fe and Co metals not only changed the phase of Nickel phosphide but also modified the morphology of material, which synergistically improve the HER performance. Thus, CoFeNiP/NF displays good electrocatalytic activity and durability for HER in alkaline media (1 M KOH), exhibiting a low onset overpotential of 27 mV and overpotential of 104 mV to reach the current density of 10 mA/cm 2 . The introduction of other metal ions not only changed the phase of Nickel phosphide but also modified the morphology of material, which synergistically improve the HER performance. This study not only provides a strategy for controllable preparation of nickel phosphides but also investigates structure/component design for transition metal phosphides electrocatalysts .
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xueli Zhang,Zhiyuan Lin,Wei Su,Mingtao Zhang,Xiaojing Wang,Kexun Li
The low power output of microbial fuel cell (MFC) requires high-performance catalysts to facilitate cathodic oxygen reduction reaction (ORR). In this work, a series of electrocatalysts (Fe/TTF) are synthesized by thermalizing N-rich covalent triazine framework (CTF) with various amount of FeCl 3 ·6H 2 O at different calcination temperatures for ORR catalysis in MFC. Electrochemical measurements reveal that Fe/TTF-0.5-900 synthesized with a mass ratio of 1:2 (FeCl 3 ·6H 2 O: CTF) at 900 °C exhibits the minimum charge transfer resistance and optimal catalytic behavior in ORR process. The MFC with Fe/TTF-0.5-900 cathode displays a high maximum power density of 2617 mW·m −2 , which surpasses those of other Fe/TTF electrocatalysts, thermalized covalent triazine framework (TTF) and the benchmark activated carbon (AC). The results indicate that TTF as a porous carbon matrix with favorable nitrogen doping promotes charge and mass transfer greatly, and the combination of iron carbide substantially benefits the improvement of MFC performance. Moreover, according to density functional theory (DFT) calculation, iron carbide is significantly preferable for ORR catalysis by accelerating the break of O-O bond in *OOH, which further reveals that the ORR on iron carbide follows four-electron pathway. Therefore, Fe/TTF-0.5-900 can be applied as an economical and highly active electrocatalyst in MFC to achieve high-efficiency energy conversion.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yang Yang,Meihong Lin,Yunhua Song,Gulinigaer Tuerhong,Jiaqi Dai,Tao Zhang,Donggang Guo,Lu Liu
Water splitting is a promising hydrogen production technology limited by the slow kinetic oxygen evolution reaction (OER). The development of highly active and robust OER catalysts is in high demand. A series of three-dimensional (3D) self-supported FeOOH@Ni(OH) 2 heterostructures supported on nickel foam are synthesized and used as efficient OER catalysts using a simple hydrothermal method . The benefits of the appropriate 3D nanoflower morphology, the large number of FeOOH nanosheets adhered on the nanoflower surface, the formation of heterogeneous interfaces, and the synergistic effect of Ni(OH) 2 and FeOOH significantly improve the OER catalytic performance of the material. The optimal catalyst in 1 M KOH, alkaline artificial seawater (1 M KOH + 1 M NaCl), and alkaline nature seawater (1 M KOH + seawater) require only 285, 286, and 325 mV overpotential, respectively, to achieve 100 mA cm −2 current density and has robust stability. This study contributes to the rational design of interface-engineered heterostructures for seawater splitting by synthesizing high catalytic activity catalysts.
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