Journal of Physical Chemistry C
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2022
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IF 4.177
Yanjun Yu,Chen Chen,Yiheng Liu,Hongliang Yu,Shuaijie Li,Yanan Xue,Ning Cai,Jianzhi Wang,Faquan Yu
Developing efficient and cost-effective bifunctional catalytic electrodes is of great importance to water splitting. In this study, hybrid Ni/Ni(OH)2-coated NiCo2O4 nanorods were grown on Ni foam (NF) by a facile growth–conversion–epitaxy approach. The epitaxial decoration of Ni/Ni(OH)2 composite could increase the intrinsic activity of NiCo2O4/NF and enhance the charge-transfer rate. This self-standing hierarchical nanohybrid with unique surface chemistry and interface engineering exhibits an excellent electrocatalytic performance. The optimized Ni/Ni(OH)2-NiCo2O4/NF only requires overpotentials of 53 and 235 mV to reach a current density of 10 mA cm–2 for HER and OER, respectively. The electrolyzer achieved 10 mA cm–2 at a low cell voltage of 1.51 V for water splitting. This work offers a new perspective for rationally designing electrocatalytic materials by surface decoration.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Xiao-Qiu Lin,Jia-Mei You,Ling-Yu Meng,Naoko Yoshida,Jing-Long Han,Cong-Ju Li,Ai-Jie Wang,Zhi-Ling Li
Tetrabromobisphenol A (TBBPA), a hazardous and persistent flame retardant , has been widely detected in the natural aquatic system. The acceleration of reductive debromination (rate-limiting process) is vital during the decomposition and detoxification of TBBPA. This study achieved superior TBBPA electrochemical reductive debromination performance by nano Pd doped Ni foam electrode (4.8 times higher than Ni foam electrode). The optimal TBBPA reductive debromination performance was obtained under −1.2 V of cathode potential, 1.2 wt% of Pd loading, 10 mg L −1 of TBBPA and 100 mM of Na 2 SO 4 as the electrolyte solution. UPLC-QTOF-MS verified that Br atoms in TBBPA were removed sequentially to form bisphenol A as the major product. Most TBBPA was reductively debrominated by atomic H* through indirect hydrodebromination, evidenced by the atomic H* quenching test. The higher solution conductivity and appropriate TBBPA concentration would contribute to the debromination efficiency. Excessive H 2 generation whether by over negative potential or H atom richness electrolyte largely disturbed the reaction process and restricted the debromination. The improved generation of reductant (H*) ads Pd was the most significant, while excessive Pd loading would make aggregation and limit the debromination efficiency. The study confirmed the optimization strategies of conditions for Pd/Ni foam electrode and revealed the related function mechanism for stimulating TBBPA electrochemical reduction, giving suggestions for the efficient removal of TBBPA in the aquatic environment.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2021
·Vol. 127
·期 6
·1-10
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IF 2.584
Liu Yurong,Niu Shaoyu,Hu Rong
In this work, the ferric cobalt sulfide/aminated graphene quantum dots (FeCo 2 S 4 /NH 2 -GQDs) nanoflowers grown on Ni foam substrate have been successfully fabricated via a facile two-step hydrothermal method. The as-prepared FeCo 2 S 4 /NH 2 -GQDs nanoflowers can expose plenty of electroactive sites, provide fast charge transfer paths and buffer the drastic volume change during long-term charge–discharge cycles. Therefore, the FeCo 2 S 4 /NH 2 -GQDs nanoflowers exhibit excellent supercapacitive performance, including high specific capacitance, excellent rate capability and cycling stability. The specific capacitance of FeCo 2 S 4 /NH 2 -GQDs composite electrode reaches 2314.8 and 1802.5 F g −1 at the current density of 1 and 10 A g −1 , respectively, while maintaining superior cycling stability with 95.1% capacitance retention after 5000 cycles. This study proves that NH 2 -GQDs are promising materials to enhance the electrochemical performance of bimetallic sulfides, providing a new insight for the design and fabrication of novel electrode materials for high-performance supercapacitors.
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Nano Materials Science
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2021
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IF 0
Ning You,Shuai Cao,Mengqiu Huang,Xiaoming Fan,Kun Shi,Haijian Huang,Zhangxian Chen,Zeheng Yang,Weixin Zhang
Improving catalytic activity and durabilty through the structural and compositional development of bifunctional electrocatalysts with low cost, high activity and stability is a challenging issue in electrochemical water splitting. Herein, we report the fabrication of heterostructured P-CoMoO 4 @NiCoP on a Ni foam substrate through interface engineering, by adjusting its composition and architecture. Benefitting from the tailored electronic structure and exposed active sites, the heterostructured P-CoMoO 4 @NiCoP/NF arrays can be coordinated to boost the overall water splitting. In addition, the superhydrophilic and superaerophobic properties of P-CoMoO 4 @NiCoP/NF make it conducive to water dissociation and bubble separation in the electrocatalytic process. The heterostructured P-CoMoO 4 @NiCoP/NF exhibits excellent bifunctional electrocatalysis activity with a low overpotential of 66 mV at 10 mA cm −2 for HER and 252 mV at 100 mA cm −2 for OER. Only 1.62 V potential is required to deliver 20 mA cm −2 in a two-electrode electrolysis system, providing a decent overall water splitting performance. The rational construction of the heterostructure makes it possible to regulate the electronic structures and active sites of the electrocatalysts to promote their catalytic activity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Ying Gao,Hanwei He,Wenyu Tan,Yizhi Peng,Xiaomei Dai,Yihui Wu
Exploring efficient, abundant, low-cost and stable materials for hydrogen evolution reaction (HER) is highly desired but still a challenging task. Herein, Ni–Se–Mo electrocatalysts supported on nickel foam (NF) substrate were synthesized by a facile one-step electrodeposition method. The Ni–Se–Mo film presents high electrocatalytic activity and stability toward HER, with a low overpotential of 101 mV to afford a current density of 10 mA cm −2 in 1.0 M KOH medium. Such excellent HER performance of Ni–Se–Mo film induced by the synergistic effects from Mo-doped Ni–Se film leads to the fast electron transfer . This work provides the validity of interface engineering strategy in preparing highly efficient transition metal chalcogenides based HER electrocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Lumeng Wang,Daoxin Liu,Zhongfeng Zhang,Ye Li,Jingru Liu,Yang Yang,Bing Xue,Fangfei Li
As one of the most efficient, low-cost, and readily available electrocatalysts for oxygen evolution reaction (OER) in alkaline environments, the nickel-iron electrocatalyst is of great significance to commercial water splitting. In this study, NiFe-layered double hydroxide loaded on nickel foam (NiFe-LDH/NF) was synthesized via a simple one-step hydrothermal method , whose OER catalytic performance could be successfully optimized by further electrochemical reconstruction. The results show that NF is an effective precursor to loading crystallized Ni(OH) 2 nanoparticles during hydrothermal synthesis, leading to the generation of high-performance NiOOH during OER reconstruction. Under the optimal Ni:Fe feeding ratio, Ni 2 Fe 1 -LDH/NF requires an ultra-low OER overpotential of 239 mV at 50 mA cm −2 and 260 mV at 100 mA cm −2 , whose Tafel slope is only 64.1 mV dec −1 . Impressively, Ni 2 Fe 1 -LDH/NF also achieves an ultra-low voltage of 1.44 V at 10 mA cm −2 with excellent long-term stability for overall water splitting. Unlike the previous viewpoint that only Ni species dominate surface reconstruction of NiFe-LDH, in this article the decisive influence related to Fe species on the reconstruction layers’ activity and stability is confirmed by electrochemistry, Raman, and XPS analysis during reconstruction process. During OER reconstruction, the surface Ni:Fe ratios can be "self-adaptively" regulated to an appropriate region, thus the stable reconstruction layers rich in NiOOH can be formed as the protective shells for NiFe-LDH. Furthermore, such "self-adaptive" reconstruction, assisted with appropriate initial Ni:Fe feeding ratios, can also stimulate more Ni 3+ active sites for OER, benefitting the outstanding catalytic performance of NiFe-LDH/NF for overall water splitting and prospective large-scale application.
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Journal of Water Process Engineering
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2023
·
IF 7
Xinrui Liu,Rui Guo,Xia Qin,Cuicui Xu
In this work, a Ni foam/CNTs/Cu composite electrode was prepared via the impregnation and electrodeposition methods. The electrode enhanced the total nitrogen removal and N 2 selectivity , when served as a cathode for NO 3 − -N reduction. SEM, EDS, XRD, and XPS characterization revealed that both CNTs and metallic copper were introduced onto the surface of the Ni foam substrate successfully. Besides, the LSV, CV, EIS and C dl results indicated more electrochemical active sites were in the Ni foam/CNTs/Cu electrodes than in Ni foam/Cu electrodes. Under optimal preparation conditions, the Ni foam/CNTs/Cu electrode showed N 2 selectivity of 68.89 % and nitrate removal rate of 96.75 % in 100 mg/L nitrate solution with Na 2 SO 4 as electrolyte. The selectivity of N 2 could be significantly enhanced by adding Cl − as electrolyte, and the nitrogen selectivity increased with the increase of Cl − concentration. At 1.25 g/L NaCl, the Ni foam/CNTs/Cu electrode could achieve >95 % nitrate and total nitrogen removal and close to 100 % N 2 selectivity. The N 2 selectivity of the Ni foam/CNTs/Cu electrode was 2.534 and 1.8 times of the Ni foam/Cu electrode when 0.5 g/L Na 2 SO 4 and 0.5 g/L NaCl were used as electrolytes, respectively. Consequently, to achieve the same nitrate reduction effect, the Ni foam/CNTs/Cu electrode could reduce the amount of NaCl compared with Ni foam/Cu electrode. The electrodes were tested in 6 cycles and proved to be stable. At last, a potential mechanism of nitrate‑nitrogen removal by the electrocatalytic process was suggested.
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ELECTROCHIMICA ACTA
·
2019
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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.
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ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Jingrui Hu,Yingqing Ou,Yanhong Li,Di Gao,Yunhuai Zhang,Peng Xiao
Efficient and stable bifunctional electrocatalysts composed of Earth-abundant elements are crucial to the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). Herein, FeCo2S4 nanosheet arrays loaded on Ni foam (NF) are synthesized and first employed as a bifunctional electrocatalyst for full water-splitting. Remarkably, the self-assembled, binder-free, and cost-effective FeCo2S4/NF electrode shows high OER catalytic activity, which only requires an overpotential of 270 and 290 mV to achieve current densities of 50 and 100 mA cm–2, respectively. Moreover, the FeCo2S4/NF electrode exhibits considerable OER stability over 20 h at a static current density of 50 mA cm–2, with negligible potential change in alkaline electrolyte. Meanwhile, when serving as a catalyst for the HER under alkaline conditions, an overpotential of just 132 mV is required to deliver the current density of 10 mA cm–2. The structural investigation demonstrates the formation of a Co(Fe)-(oxy)hydroxides layer on the catalyst surface during the OER test, which could be the real active species. Furthermore, because of the high catalytic activity and stability of this bifunctional electrocatalyst, we prepared a high-performance overall water electrolyzer that could achieve a current density of 10 mA cm–2 at a cell voltage of 1.56 V.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Xu Peiman,Li Jingwei,Luo Jiaxian,Wei Licheng,Zhang Dawei,Zhou Dan,Xu Weiming,Yuan Dingsheng
Earth-abundant and efficient bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are highly significant for renewable energy systems. However, the performance of existing electrocatalysts is usually restricted by the low electroic conductivity and the limited amount of exposed active sites. In this work, (Fe 0.2 Ni 0.8 ) 0.96 S tubular spheres supported on Ni foam have been prepared by a sulfuration of FeNi layered double hydroxide spheres grown on Ni foam. Benefiting from the unique tubular sphere architecture, the rich inner defects and the enhanced electron interactions between Fe, Ni and S, this electrocatalyst shows low overpotential of 48 mV for HER at 10 mA cm −2 in 1.0 mol L −1 KOH solution, which is one of the lowest value of non-previous electrocatalyts for HER in alkaline electrolyte. Furthermore, assembled this versatile electrode as an alkaline electrolyzer for overall water splitting, a current density of 10 mA cm −2 is achieved at a low cell voltage of 1.56 V, and reach up to 30 mA cm −2 only at an operating cell voltage of 1.65 V.
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ELECTROCHIMICA ACTA
·
2016
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IF 4.803
Hongyan Chen,Yani Ai,Fan Liu,Xing Chang,Yuan Xue,Qi Huang,Chi Wang,Hualin Lin,Sheng Han
Hierarchical nanoarchitecture and composition can offer preponderances for enhancing pseudocapacitor performances. This paper reports on the three-dimensional hierarchical carbon-coated Ni–Mn layered double hydroxide on nickel foam (LNC) electrode material prepared via a facile two-step hydrothermal reaction. The resulting performance of the LNC composite material has high specific capacitance (1916 F g −1 ) and good cycling stability (91% retention after 5000 charge–discharge cycles). Moreover, the material can be directly used as an integrated flexible electrode with excellent rate capability (79.5% retention at 10 A g −1 ), which is significant in practical applications and large-scale syntheses. Furthermore, the LNC materials acting as a positive electrode for the asymmetric supercapacitor also exhibit high specific capacitance of 120.67 F g −1 at 0.5 A g −1 and excellent cycling stability with 84.2% capacitance retention after 5000 cycles at a current density of 5 A g −1 .
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JOURNAL OF POWER SOURCES
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2014
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IF 5.211
Xuefei Gong,J.P. Cheng,Fu Liu,Li Zhang,Xiaobin Zhang
Nickel–Cobalt hydroxide microspheres are electrodepositioned on the films of NiCo 2 O 4 nanowires grown on the current collector through a facile approach and the hierarchical structures are then investigated as an electrode material for high-performance supercapacitors . Owing to the superior electrical conductivity of NiCo 2 O 4 nanowires, the porous structure of the (Ni–Co)(OH) 2 microspheres and the synergic effect of the multi-components, the electrode can deliver a high areal capacitance of 6 F cm −2 and a corresponding specific capacitance of 1132 F g −1 at a current density of 2 mA cm −2 , as well as a good rate capability (61.8% capacitance retention from 2 mA cm −2 to 50 mA cm −2 ), and excellent cycling stability (90% capacitance retention after 2000 cycles). The results suggest that our research opens up the possibility for the fabrication of high-performance energy-storage devices of binder-free electrodes.
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危险品化学品经营许可证（带存储）