JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Yuchun Ren,Jiayun Song,Shengjun Sun,Zixiao Li,Chaoxin Yang,Zhengwei Cai,Min Zhang,Meng Yue,Hefeng Wang,Dongdong Zheng,Yanqin Lv,Xuping Sun,Bo Tang
Seawater electrolysis, benefiting from the closeness to coastal areas, is recognized as a promising alternative for hydrogen (H 2 ) production to replace conventional technologies. However, the effectiveness of this method is limited by anode catalysts that exhibit high energy consumption and short lifespans due to chloride-induced chemical corrosion. Herein, we propose a hierarchical Ni phosphate@NiFe layered double hydroxide on Ni foam (NiPO x @NiFe LDH/NF) towards alkaline seawater oxidation (ASO). In terms of its unique hierarchical structure, NiPO x @NiFe LDH/NF delivers an industrial current density reaching up to 1 A cm −2 with 352 mV overpotential. Electrochemical experiments and in situ characterizations reveal that self-released PO 4 3− can act as a robust barrier for chloride ions adsorption through strong electrostatic repulsion, promoting unstable activity phase NiOOH drive at 1 A cm −2 for 600 h, farther than NiFe LDH/NF (75 h). Moreover, the honeycomb-like NiFe LDH shell facilitates the rapid and uniform release of O 2 bubbles, which enhances the mechanical stability of the electrode during long-term ASO. In general, this work offers valuable potential for designing an advanced anodic electrode with remarkable electrochemical performance and superior anti-corrosion for ASO.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Kunpeng Song,Guanghui Li,Junchen Yu,Tianyue Zheng,Jingyu Wang
Efficient methods for preparing carbon nanotube (CNT)-confined metal catalysts are of great significance for electrocatalysis. Hence, in this study, Fe and Co promoters were added to the precursors of commercial carbon black and melamine to form N -doped CNTs confined bimetallic catalysts (FeCo@ N -CNTs) via in situ pyrolysis. The FeCo@ N -CNT catalysts exhibited a bamboo-like morphology with FeCo alloy nanoparticles encapsulated in the CNTs and high activity toward the oxygen reduction reaction, with a half-wave potential of 0.864 mV, higher than that of commercial Pt/C (0.827 mV) in alkaline solutions. The catalytic performance is attributable to the synergistic effects between the FeCo alloy and N -doped CNT structure. Moreover, the confinement of the FeCo nanoparticles inside the CNTs imparted the prepared catalysts with resistance to methanol poisoning and long-term stability. This versatile method of synthesizing CNTs directly from carbon black provides a new strategy for preparing high-performance non-precious-metal-based N -doped CNT catalysts for practical fuel cell applications.
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FUEL
·
2024
·
IF 6.7
Zhengyu Yang,Ben Ma,Yingke Zhou
Atomic dispersed metal-nitrogen-carbon (M-N-C) catalysts have shown great promise as efficient and stable electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in metal-air batteries. In this work, we report the scalable synthesis of atomically dispersed iron single-atom catalysts supported on nitrogen-doped biomass-derived carbon aerogels (Fe-N-C) via direct high-temperature gas transport based on iron foil. The optimal Fe-N-C catalyst prepared at 1000 °C with 0.67 wt% Fe loading exhibits outstanding ORR activity with a half-wave potential of 0.84 V, along with robust OER performance reaching 10 mA/cm 2 at 250 mV overpotential. The catalyst also demonstrates remarkable stability over 5000 cycles. Owing to the excellent ORR and OER activity and stability, an aqueous rechargeable zinc-air battery fabricated with Fe-N-C as the bifunctional air cathode delivers a high open circuit voltage of 1.49 V, peak power density of 125.4 mW/cm 2 , and exceptional cycling stability over 147 h. The biomass-derived porous carbon structure, nitrogen doping, and isolated Fe single atoms act synergistically to optimize oxygen reaction kinetics, active site density, and stability. Our work provides a scalable strategy to produce high-performance M-N-C catalysts for commercially viable metal-air batteries.
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Nanoscale
·
2015
·Vol. 7
·期 33
·13918-13923
·
IF 7.394
Wenlong Gao,Mei Liu,Limei Liu,Hui Zhang,Bin Dong,Christopher Y. Li
Although artificial micromotors have undergone tremendous progress in recent years, their fabrication normally requires complex steps or expensive equipment. In this paper, we report a facile one-step method based on an emulsion solvent evaporation process to fabricate multifunctional micromotors. By simultaneously incorporating various components into an oil-in-water droplet, upon emulsification and solidification, a sphere-shaped, asymmetric, and multifunctional micromotor is formed. Some of the attractive functions of this model micromotor include autonomous movement in high ionic strength solution, remote control, enzymatic disassembly and sustained release. This one-step, versatile fabrication method can be easily scaled up and therefore may have great potential in mass production of multifunctional micromotors for a wide range of practical applications.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 46
·31170-31176
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IF 4.493
Haidong Zhao,Rui Liu,Yong Guo,Shengchun Yang
In the current research, the PtxAgy (x/y = 86/14, 79/21, 52/48, 21/79, 11/89) nanoparticles (NPs) are synthesized in the KNO3–LiNO3 molten salts without using any organic surfactant or solvent. The SEM results suggest that when the content of Ag is higher than 48%, the wormlike PtxAgy nanotubes (NTs) can be synthesized. The diameter of the PtxAgyNTs shows a slow decrease with the increase of Ag content. The TEM and HRTEM results indicate that the growth of hollow PtxAgy NTs undergoes an oriented attachment process and a Kirkendall effect approach. The results of cyclic voltammetry (CV) measurement indicate that the Pt52Ag48 catalyst presents a remarkable enhancement for methanol electrooxidation, while the Pt86Ag14 catalyst prefers electrochemically oxidizing formic acid compared with that of the commercially available Pt black.
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RSC Advances
·
2015
·Vol. 5
·期 106
·87061-87068
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IF 3.84
Pei Song,Shan-Shan Li,Li-Li He,Jiu-Ju Feng,Liang Wu,Shu-Xian Zhong,Ai-Jun Wang
In this work, bimetallic Au–Pt alloyed nanowire networks (AuPt NNs) were facilely synthesized by a simple and rapid one-pot wet-chemical method on a large-scale, using N-methylimidazole as a structure-directing agent and a weak stabilizing agent. The surface of AuPt NNs was clean owing to the easy removal of the adsorbed N-methylimidazole. The control experiments demonstrated that the morphologies of AuPt NNs were strongly correlated with the amount of N-methylimidazole and reaction temperature. The formation mechanism included the four-stage growth processes: rapid nucleation, selective adsorption, π–π induced assembly, and oriented attachment growth. The as-synthesized AuPt NNs exhibited enhanced electrocatalytic activity and improved stability for methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) as compared to commercial Pt black and individual Pt nanoparticles.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 20
·6909-6918
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IF 6.1
Hongjun Chen,Liming Deng,Sheng Zhao,Shuyi Liu,Feng Hu,Linlin Li,Jianwei Ren,Shengjie Peng
Developing efficient and durable hydrogen evolution reaction (HER) electrocatalysts is critical for industrial and sustainable hydrogen production. Herein, a simple co-precipitation strategy is proposed to successfully construct catalysts with a Mott–Schottky heterojunction by coupling a transition-metal phosphate to the surface of stripped MXene thin-layer nanosheets (M3(PO4)2@MXene, M = Co, Ni, and Fe). The Co3(PO4)2@MXene with a unique tightly connected 2D/2D heterostructure and built-in electric field induces directional electron transfer at the interface, regulates the polarized structure of the active sites, and accelerates both mass and electron transport. Consequently, the optimized Co3(PO4)2@MXene demonstrates outstanding HER performance, achieving low overpotentials of 46 and 58.6 mV at 10 mA cm−2 in alkaline freshwater and seawater electrolytes, respectively. Moreover, the Co3(PO4)2@MXene heterojunction catalyst maintains stable operation at a high current density of 500 mA cm−2 for over 100 h in alkaline seawater electrolytes. More importantly, Co3(PO4)2@MXene can offer a low potential of 1.71 V at 500 mA cm−2 with stable operation for 50 h in a flow-type alkaline seawater electrolyser. This study provides a unique heterostructure in an electrocatalyst for an efficient HER and presents its potential application in seawater electrolysis.
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Small
·
2024
·
IF 13
Huamei Tong,Shengjie Xu,Xinyu Zheng,Mengyue Qi,Jianjun Zhu,Di Li,Deli Jiang
Constructing metal alloys/metal oxides heterostructured electrocatalysts with abundant and strongly coupling interfaces is vital yet challenging for practical electrocatalytic water splitting. Herein, CoRu nanoalloys uniformly anchored on CoMoO 4 nanosheet heterostructured electrocatalyst (CoRu-CoMoO 4 /NF) are synthesized via a self-templated strategy by simply annealing of Ru-etched CoMoO 4 /NF precursor in a reduction atmosphere. The dense and robustly coupled interface not only provides abundant active sites for water splitting but also strengthens the charge transfer efficiency. Furthermore, the theoretical calculations unveil that the strong electronic interaction at CoRu-CoMoO 4 interface can induce an interfacial electron redistribution and reduce the energetic barriers for the hydrogen and oxygen intermediates, thereby accelerating the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) kinetics. The resultant catalyst only requires the overpotentials of 49 mV for HER and 209 mV for OER at 10 mA cm −2 . Moreover, the constructed CoRu-CoMoO 4 ||CoRu-CoMoO 4 two-electrode cell achieves a cell voltage of 1.54 V at 10 mA cm −2 , outperforming the benchmark Pt/C||IrO 2 . This work explores an avenue for the rational design of heterostructured electrocatalysts with abundant interfaces for practical water-splitting electrocatalysis.
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ChemistrySelect
·
2024
·Vol. 9
·期 15
·e202401460
·
IF 1.9
Wenting Chen,Shaoyi Li,Xue Lu,Jian Yang,Shaobo Cao,Kang Da,Ximei Fan
Graphical Hyperbranched phthalocyanine copper (HCuPc) wrapping nano-silica is synthesized via in situ polymerization and served as precursor for preparing atomically dispersed Cu−N−C electrocatalysts. Highly dispersed copper single-atom catalyst Cu-N−C has good electrocatalytic performance by using chemical anchoring of phthalocyanine and steric hindrance to restrict the migration and aggregation of Cu atoms. Atomically dispersed nonprecious metal-based catalysts have been considered as the most promising alternatives to Pt-based catalysts since their excellent catalytic activities and almost 100 % atom utilization in oxygen reduction reaction. However, the agglomeration of metal atoms is unavoidable during pyrolysis process, thus leads to the decrease of electrocatalytic performance. Herein, hyperbranched phthalocyanine copper (HCuPc) wrapping nano-silica is synthesized via in situ polymerization and served as precursor for preparing atomically dispersed Cu−N−C electrocatalysts. Owing to the confinement effect of chemical-anchoring and spatial-hindrance, the migration and agglomeration of Cu atoms are restricted in carbonization process. The aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and X-ray photoelectron spectroscopy (XPS) are performed to confirm the atomically dispersed of as-synthesized catalyst, which is labelled as HCu−N−C/SiO 2 . In addition, the HCu−N−C/SiO 2 possess superior ORR electrocatalytic activities with a half-wave potential of 0.874 V vs RHE and a limiting current density of 5.7 mA cm −2 . The zinc-air batteries assembled with HCu−N−C/SiO 2 catalyst exhibit a high specific capacity of 789 mAh g −1 as well as a maximum discharge power density of 176 mW cm −2 . This work proves that hyperbranched phthalocyanine structure could be a useful confined framework to the fabrication of singles-atom catalysts.
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FUEL
·
2024
·
IF 6.7
Shi Chen,Yueqi Zhao,Caiyun Chang,Xinyi Wang,Li Hou,Jing Jin,Faming Gao
The low electron transfer efficiency compared to precious metals, few active sites and poor stability of transition metal sulfides (TMSs) limit their wide application in electrocatalysis. Optimizing the electronic structure and morphology is an effective means to improve the catalytic performance of TMSs. In this work, we synthesized a heterogeneous core–shell CoFeMo polymetallic sulfide/N-rich carbon skeleton composite catalyst (CFMS/NC) with CoMo-S as the core and CoFeMo-S as the shell by using MOF as precursor and stepwise substitution method. Compared with monomeric sulfides, polymetallic sulfides can exert the synergistic effect between metals, optimize the electronic structure and improve the intrinsic activity of metallic sulfides. Meanwhile, the core–shell structure supported by N-rich carbon skeleton has larger active specific surface area, higher stability and conductivity. The overpotential of CFMS/NC catalyst is only 122 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) and 325 mV at 50 mA cm −2 for oxygen evolution reaction (OER). Besides, CFMS/NC exhibits outstanding performance in overall water splitting, achieving a current density of 100 mA cm −2 at only 1.76 V and maintaining good stability for 30 h. This study proposes a practical method for synthesizing highly efficient electrocatalysts for water splitting.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xinzeng Zhang,Lixin Chen,Yuanyuan Liu,Jing Li,Meiri Wang,Hongtao Cui,Zhiwen Chen,Chandra Veer Singh,Kaihua Liu
Construction of heterogeneous interfaces with dual active components to synergistically promote both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an effective strategy for facilitating electrochemical water splitting, but the appropriate active component regulation via simple synthesis procedures is still challenging. Herein, the Co and Co 2 Mo 3 O 8 active components are screened to construct effective heterogeneous interfaces and successfully integrated on Ni foam by thermal reduction of cobalt molybdate precursor. And this bifunctional electrode (Co/Co 2 Mo 3 O 8 /NF) required overpotentials of only 164 and 360 mV to drive the 100 mA cm −2 for HER and OER in alkaline media , respectively. Theoretical calculations showed that the electron transfer occurred from Co to Co 2 Mo 3 O 8 at the interface, then the formed interfacial cobalt atoms with deficient electron were beneficial for water activation, and reduced energy barrier of water dissociation under the synergistic effect of Co 2 Mo 3 O 8 . Notably, the alkaline electrolyzer based on symmetric Co/Co 2 Mo 3 O 8 /NF electrodes generated 100 mA cm −2 at a voltage of only 1.75 V, surpassing commercially available precious-metal Pt/RuO 2 -based catalysts.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 34
·17982-17989
·
IF 8.867
Xiang Wang,Feng Li,Wenzhu Li,Wenbing Gao,Yu Tang,Rong Li
The development of highly active, stable and affordable hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts for renewable energy reserve and conversion remains a serious challenge. In this study, a simple solvothermal strategy is adopted to synthesize hollow bimetallic cobalt-based selenide templated by cobalt-based bimetallic organic frameworks (BM-ZIFs) with superior water splitting activity and stability, owing to the perfect hollow polyhedral structure with numerous active sites. Moreover, the introduction of a transition metal element not only enhances the electroconductibility of the catalyst, but also further improves the electrocatalytic ability via the Jahn–Teller effect. Furthermore, the synthetic method is convenient and low toxic without high temperature carbonization process. The as-synthesized hollow MxCo1−xSe2 polyhedrons exhibit excellent electrocatalytic performances. Particularly, the Zn0.1Co0.9Se2 exhibits low overpotentials of −140 mV and 340 mV at a current density of 10 mA cm−2, a small Tafel slope of 49.9 mV dec−1 and 43.2 mV dec−1 as well as a high current density with robust catalytic stability for both HER in acidic and OER in basic solutions, respectively. This strategy provides a prospect for preparation of homogenously doped and self-templated hollow structure non-noble metal electrocatalysts with high HER and OER performance.
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