CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yunpeng Liu,Ren Zou,Binhao Qin,Jianyun Gan,Xinwen Peng
Water electrolysis is a sustainable strategy for renewable energy conversion and storage that can be replenished by intermittent electricity sources. Despite the decades-long progress, the commercialization of water electrolysis remains fraught with difficulties owing to its high electricity consumption. We couple the hydrogen evolution reaction with the electrooxidation of xylose obtained from regenerated hemicellulose to organic acids, utilizing a bifunctional electrode consisting of Co 9 S 8 /Ni 3 S 2 . The electrochemically activated anodic sites, including Co 2+ /Co 3+ , Co 3+ /Co 4+ , Ni 2+ /Ni 3+ , and Ni 3+ /Ni 4+ redox species, are responsible for xylose electrooxidation, with the required potential reduced by 290 mV at 100 mA cm −2 compared with water oxidation. Moreover, the process yields over 60% towards formic acid at the anode, is accompanied by the production of hydrogen at the cathode. Xylose oxidation is kinetically and thermodynamically more favorable than water oxidation, significantly reducing the overall energy consumption relative to conventional water electrolysis. This study provides a promising strategy for the scalable and energy-efficient process of biomass electrooxidation coupled with hydrogen production.
研究领域:
能源化学
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电催化
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可再生能源
✓ 已验证
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
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2024
·Vol. 48
·期 1
·1-11
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IF 1.9
Wei D,Zhou Z F,Ma H H,Xu W B,Ren F M
Transition metal sulphides derived from metal–organic frameworks (MOFs) have gained increasing attention as promising electrode materials for energy storage, owing to their elevated theoretical capacitance and exceptional electrochemical features. Herein, a simple dual organic ligand strategy and controllable pyrolysis treatment were used to prepare porous micro-rods Co 9 S 8 /Ni 3 S 2 /NC-T (T denotes for temperature) composite materials. Their structure and composition can be precisely controlled by adjusting the pyrolysis temperature. Co 9 S 8 /Ni 3 S 2 /NC-T composite materials possess rich pore structures, unique three-dimensional carbon conductive networks and synergistic effects of Co 9 S 8 and Ni 3 S 2 . Experimental results of cyclic voltammetry revealed that the bimetal sulphides in Co 9 S 8 /Ni 3 S 2 /NC-T can provide substantial redox pseudocapacitance for electrochemical reactions. Electrochemical tests indicated that the optimal carbonization temperature was 700°C, and the Co 9 S 8 /Ni 3 S 2 /NC-700 electrode material has the highest specific capacity of 2288 F g −1 at a current density of 1 A g −1 and an excellent rate capability with retention of about 61.2% at a current density of 10 A g −1 . This study provides methodological guidance for the rational composition control and unique structure of MOF-derived materials for supercapacitors. Graphical
研究领域:
材料科学
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能源存储
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电化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xueping Yu,Beibei Gao,Biao Feng,Yage Peng,Xiaoyong Jin,Gang Ni,Juan Peng,Min Yao
Modular electrochemical production (MEP) system could decouple the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), and pairing with a redox mediator (RM), respectively. Herein, Mott–Schottky Co 9 S 8 /Ni 3 S 2 heterojunction was constructed, which was employed as a RM to separate the hydrogen and oxygen production in space and time in MEP system for H 2 . The MEP system for H 2 involved a two−step electrochemical−electrochemical (EC−EC) looping process. The reversible redox reaction of Co 9 S 8 /Ni 3 S 2 was paired with HER in step 1 and subsequently paired with OER in step 2. The Mott–Schottky hetero-structures enabled the redistribution of Ni central charge and accelerated the electron transfer from semiconductor Ni 3 S 2 to metallic Co 9 S 8 on the interface. This made the formation of Lewis acid at the Ni 3 S 2 in the heterojunction , which bonded with the OH − Lewis base, facilitating the electrochemical redox kinetics of Co 9 S 8 /Ni 3 S 2 . Thus, the Co 9 S 8 /Ni 3 S 2 RM presented a high area capacitance (29.60 F/cm 2 at 5 mA/cm 2 ), and an excellent stability upon operation over 5000 cycles (15 days). The MEP system can continuously produce H 2 for 1502 s at 10 mA/cm 2 with a Faradaic efficiency of 100%. The MEP system possessed a high energy efficiency (83%), requiring a lower cell voltage than that of a conventional water electrolysis system. The MEP system for H 2 enabled flexible utilization of renewable solar energy by photovoltaic (PV) panels, thereby facilitating solar-to-hydrogen conversion.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Luyao Lv,Hurong Zhang,Jiaqi Zhao,Mei Yan,Chunlin Li,Zeyan Lu,Lulu Huo,Tengfei Ma,Bo Liu
Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is critical for sustainable energy conversion. Herein, a P-doped Co 9 S 8 /Ni 3 S 2 heterostructure with a hierarchical nanoarray architecture is fabricated on nickel foam via an in situ growth strategy. Structural characterizations reveal a dense, three-dimensional hierarchical coral-like architecture, composed of ultrathin nanosheets intricately decorated with fine nanorods. High-resolution TEM analysis confirms the construction of Co 9 S 8 /Ni 3 S 2 hetero-interfaces characterized by abundant lattice distortions and grain boundary defects. X-ray photoelectron spectroscopy analysis reveal that phosphorus incorporation induces a redistribution of local electron density at the active sites, suggesting a favorable modulation of the electronic structure that promotes intrinsic catalytic activity. Benefiting from the synergistic effects of abundant interfacial defects, rapid charge and mass transport channels, and the modulated electronic environment, the as-prepared catalyst exhibits enhanced OER performance. In 1.0 M KOH electrolyte, the heterostructure requires a low overpotential of 234.84 mV to deliver a current density of 10 mA cm −2 along with a small Tafel slope of 19 mV dec −1 and sustains continuous operation for over 500 h. This study offers valuable insights into the coupling of interface engineering and heteroatom doping for constructing high-performance transition metal sulfide electrocatalysts.
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2026
·
IF 3.6
Xinquan Zhao,Shisheng Li,Xinshu Zhang,Zhi Gao,Yi Du,Wanying Lei
Exploring efficient, stable, and earth-abundant electrocatalysts toward the oxygen evolution reaction (OER) is a central theme for realizing industrial application of water splitting. In this study, a 1D@2D heterostructure of Co 9 S 8 -Ni 3 S 2 @CoFe LDH/NF is constructed via hydrothermal and electrodeposition approaches, where ultrathin CoFe LDH nanosheets are interconnected and deposited onto Co 9 S 8 -Ni 3 S 2 nanorod arrays. This 1D@2D microstructure benefits from the exposure of a large number of accessible reactive sites. The strong interaction between the sulfide hybrid and LDH material could modulate the electronic structure of Co 9 S 8 -Ni 3 S 2 @CoFe LDH and generate a high concentration of high-valence metal sites. As a result, the optimal catalyst exhibits superior OER performance with a low overpotential of 189 mV at 10 mA cm −2 , a small Tafel slope of 30.22 mV dec −1 , and good stability in alkaline solution. This work opens up a possibility for obtaining efficient and cost-effective electrocatalysts for clean energy production through water splitting. Graphical Exploring efficient, stable, and earth-abundant electrocatalysts toward the oxygen evolution reaction (OER) is a central theme for realizing industrial applications of water splitting. In this study, a 1D@2D heterostructure of Co 9 S 8 -Ni 3 S 2 @CoFe LDH/NF is constructed via hydrothermal and electrodeposition approaches, where ultrathin CoFe LDH nanosheets are interconnected and deposited onto Co 9 S 8 -Ni 3 S 2 nanorod arrays. This 1D@2D microstructure benefits from the exposure of a large number of accessible reactive sites. The strong interaction between the sulfide hybrid and LDH material could modulate the electronic structure of Co 9 S 8 -Ni 3 S 2 @CoFe LDH and generate a high concentration of high-valence metal sites. As a result, the optimal catalyst exhibits superior OER performance with a low overpotential of 189 mV at 10 mA cm −2 , a small Tafel slope of 30.22 mV dec −1 , and good stability in alkaline solution. This work opens up a possibility for obtaining efficient and cost-effective electrocatalysts for clean energy production through water splitting.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jingwei Li,Peiman Xu,Rongfu Zhou,Ruchun Li,Lijun Qiu,San Ping Jiang,Dingsheng Yuan
Large-scale commercialization of water splitting is still challenging due to the lack of efficient, cost-effective and robust electrodes. In this work, Co 9 S 8 –Ni 3 S 2 heterointerfaced nanotubes on Ni foam (Co 9 S 8 –Ni 3 S 2 HNTs/Ni) have been successfully developed via a two-step hydrothermal method as a highly efficient, robust and flexible bifunctional electrodes for water splitting. Co 9 S 8 –Ni 3 S 2 HNTs are composed of inner 1D Co 9 S 8 nanotubes surrounded by outer 2D Ni 3 S 2 nanosheets . Co 9 S 8 –Ni 3 S 2 HNTs/Ni electrode achieves 10 mA cm −2 at overpotentials of 85 mV for H 2 evolution reaction (HER) and 50 mA cm −2 at overpotential of 281 mV for O 2 evolution reaction (OER) in 1 M KOH solution, substantially better than that on single-phased Co 9 S 8 nanotubes and Ni 3 S 2 nanosheets on Ni foam. The reason is most likely due to formation of defect-rich heterointerfaces between Co 9 S 8 nanotubes and Ni 3 S 2 nanosheets, and the significant change of binding energies of Co 2p and Ni 2p level between the Co 9 S 8 and Ni 3 S 2 , leading to the synergistic effect on the enhanced catalytic activity for HER and OER. The robust and flexibility of Co 9 S 8 –Ni 3 S 2 HNTs/Ni electrodes are demonstrated in an alkaline electrolyzer, delivering 10 mA cm −2 electrolysis current at a cell voltage of 1.59 V, one of the best bifunctional electrodes for water splitting. Owing to the fact that reaction occurs at the defects-rich heterointerfaces, the Co 9 S 8 -Ni 3 S 2 HNTs/Ni electrodes are structurally very stable.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 5
·1429-1438
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IF 6.367
Fu Liu,Xingzhong Guo,Yang Hou,Fan Wang,Chang Zou,Hui Yang
Electrochemical water splitting provides a prominent route towards clean energy conversion and storage, while unsuitable catalysts restrict its application. Core–shell hierarchical heterostructure materials with strong synergistic effects based on non-noble metal elements have been developed to compensate for inadequacy. In this work, a core–shell hierarchical heterostructure Co9S8/Ni3S2@NiFe-LDH electrocatalyst was prepared via hydrothermal and electrodeposition methods. The resultant Co9S8/Ni3S2@NiFe-120 electrocatalyst consists of Co9S8 substrates as the core and NiFe-LDHs as the shell, and exhibits excellent overall water splitting electrocatalytic activity with a low overpotential of 229 mV for the oxygen evolution reaction (OER), and 151 mV for the hydrogen evolution reaction (HER) and a full cell voltage of 1.62 V at 10 mA cm−2 current density. The core–shell heterostructure constructed by electrodeposition endows the catalyst with outstanding stability and low degradation in long-term catalytic processes as shown by continuous chronopotentiometry tests at current densities of 50, 100 and 200 mA cm−2 for 72 h. The as-prepared core–shell hierarchically heterostructural Co9S8/Ni3S2@NiFe-120 with high-efficiency and good-durability is a promising bifunctional electrocatalyst towards practical applications in overall water splitting.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 1
·46
·
IF 4
Yingping Bu,Yawen Zhang,Yingying Liu,Simin Li,Yanlin Zhou,Xuefen Lin,Zicong Dong,Renchun Zhang,Jingchao Zhang,Daojun Zhang
Effective and inexpensive electrocatalysts are significant to improve the performance of oxygen evolution reaction. Facing the bottleneck of slow kinetics of oxygen evolution reaction, it is highly desirable to design the electrocatalyst with high activity, good conductivity, and satisfactory stability. In this work, nickel foam supported hierarchical Co9S8–Ni3S2composite hollow microspheres were derived from in situ-generative MOF precursors and the subsequent sulfurization process by a simple two-step solvothermal method. The composite microspheres were directly grown on nickel foam without any binder, and nickel foam was used as the nickel source and support material. The morphology and constitution of the series self-supported electrodes were characterized by SEM, TEM, XRD, XPS, and Raman, respectively. The unique porous architecture enriched the electrode with sufficient active surface and helped to reactants and bubble evolved during electrochemical water oxidation. Through tuning the concentration of cobalt source and ligand, the content ratio of Co9S8and Ni3S2can be modulated. The heterostructures not only afford active interfaces between the phases but also allow electronic transfer between Co9S8and Ni3S2. The optimized Co9S8-Ni3S2/NF-0.6 electrode with the highest electrochemical surface area and conductivity shows the best OER performance among the series electrodes in 1 M KOH solution. The overpotential of Co9S8-Ni3S2/NF-0.6 is only 233 mV when the current density is 10 mA cm−2, and corresponding Tafel slope is 116.75 mV dec−1. In addition, the current density of Co9S8-Ni3S2/NF-0.6 electrocatalyst hardly decreased during the 12 h stability measurement. Our approach in this work may provide the future rational design and synthesis of satisfactory OER electrocatalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Xuliang Lin,Lijing Xue,Bowen Liu,Xueqing Qiu,Jianglin Liu,Xiaofei Wang,Yi Qi,Yanlin Qin
The development of highly active and stable earth-rich electrocatalysts remains a major challenge to release the reliance on noble metal catalysts in sustainable (electro)chemical processes. In this work, metal sulfides encapsulated with S/N co-doped carbon were synthesized with a one-step pyrolysis strategy, where S was introduced during the self-assembly process of sodium lignosulfonate. Due to the precise coordination of Ni and Co ions with lignosulfonate, an intense-interacted Co 9 S 8 –Ni 3 S 2 heterojunction was formed inside the carbon shell, causing the redistribution of electrons. An overpotential as low as 200 mV was obtained over Co 9 S 8 –Ni 3 S 2 @SNC to reach a current density of 10 mA cm −2 . Only a slight increase of 14.4 mV was observed in a 50 h chronoamperometric stability test. Density functional theory (DFT) calculations showed that Co 9 S 8 –Ni 3 S 2 heterojunctions encapsulated with S/N co-doped carbon can optimize the electronic structure, lower the reaction energy barrier, and improve the OER reaction activity. This work provides a novel strategy for constructing highly efficient and sustainable metal sulfide heterojunction catalysts with the assistance of lignosulfonate biomass.
研究领域:
材料科学
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电催化
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可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yan Zhou,Jingtong Zhang,Fengchao Sun,Xinping Yu,Wenpei Kang,Jun Zhang
In this work, sheet-like Co 9 S 8 was directly grown on Ni 3 S 2 spheres (donate as Co 9 S 8 @Ni 3 S 2 ) via a one-step hydrothermal synthetic approach. The structural characterization of Co 9 S 8 @Ni 3 S 2 revealed that the Co 9 S 8 nanosheets were perpendicularly arrayed on Ni 3 S 2 spheres. This heterostructure thus fixes the two-dimensional Co 9 S 8 in position on Ni 3 S 2 spheres to obtain a stable heterostructural material. Due to the strengthened morphological structure, high surface area, metallic feature of Co 9 S 8 and Ni 3 S 2 , and the synergetic effect, the Co 9 S 8 @Ni 3 S 2 showed excellent performance in sodium ion battery (SIB) anode and HER cathode. The electrochemical tests showed that Co 9 S 8 @Ni 3 S 2 can demonstrate excellent HER catalytic activity with only −0.16 V and −0.23 V overpotential needed to achieve 10 mA cm −2 and 100 mA cm −2 current density in acidic condition. Besides, Co 9 S 8 @Ni 3 S 2 heterostructure as an anode in SIB also delivered high discharge capacity of 699 mAh g −1 at 0.5 A g −1 current density in the first cycle, with 92% Columbic efficiency.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Yun Zhou,Shengqi Xi,Xigang Yang,Hongjing Wu
Conductivity and morphology are the two important factors affecting the performance of electrocatalysts . In this article, a facile two-step hydrothermal process was developed to grow Co 9 S 8 -Ni 3 S 2 nanoarrays on nickel foam (Co 9 S 8 -Ni 3 S 2 NAs/NF). The as-obtained catalyst possessed a novel morphology, in which the Co 9 S 8 nanoneedles were surrounded by Ni 3 S 2 ultrathin nanosheets . The resultant Co 9 S 8 -Ni 3 S 2 nanoarrays not only permitted more exposures of active sites but also facilitated the charges and ions transport along the nanoarrays. Moreover, both Co 9 S 8 and Ni 3 S 2 exhibited metallic properties allowed the catalysts with conductivity (metallic conductor vs. semiconductor). Co 9 S 8 -Ni 3 S 2 NAs/NF exhibited excellent electrocatalytic activities for both HER and OER in 1.0 M KOH solution. To reach a large current density of 100 mA cm −2 , it only required overpotentials of 204 mV and 346 mV for HER and OER, respectively. After long-term electrolysis, the high activities were still preserved. This work indicates efficient electrocatalysts can be obtained by the rational design of the heterostructure , which sheds some light on the development of noble metal-free electrocatalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）