JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Ruchun Li,Dan Zhou,Jiaxian Luo,Weiming Xu,Jingwei Li,Shuoshuo Li,Pengpeng Cheng,Dingsheng Yuan
Electrochemical water splitting has attracted great interest because of the growing demand for sustainable energy and increasing concerns for the environment. We present a facile strategy to design the three-dimensional (3D) urchin-like sphere arrays Co 3 O 4 as an effective bifunctional catalyst for electrochemical water splitting. The 3D urchin-like Co 3 O 4 was directly grown on Ni foam by a hydrothermal reaction and annealing treatment at a low temperature. This process offers several advantages including facile synthesis, binder-free, and low cost. The 3D urchin-like Co 3 O 4 as a catalyst for hydrogen evolution reaction exhibits a low onset potential (−130 mV vs. RHE) and good cycling stability in an alkaline electrolyte . When urchin-like Co 3 O 4 is used as a catalyst for oxygen evolution reaction , the onset potential is at 1.46 V (vs. RHE) with a low overpotential of only 230 mV. The good catalytic activity can be attributed to the unique urchin-like nanostructure , abundant mesopores, and low charge-transfer resistance (compared with Co 3 O 4 NPs). In addition, H 2 and O 2 generation was performed using Co 3 O 4 as both cathode and anode catalysts with a potential of 1.64 V to reach a current density of 10 mA cm −2 .
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
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.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·12091-12102
·
IF 3.553
Sheng Peng,Tao Shi,Gao Xiaorui,Tan Yongjian,Wu Dajun,Qian Bin,Chu Paul K.
Cobalt carbonate hydroxide possesses interesting capacitive properties due to the unique crystal structure. Herein, the hierarchical Co 3 O 4 @Co 2 (CO 3 )(OH) 2 dendritic structure was fabricated on carbon cloth with Co 3 O 4 nanoneedles as the inner core to enhance the conductivity. The loading efficiency of Co 2 (CO 3 )(OH) 2 nanowhiskers had improved obviously, and the nanowires provided more electrochemical sites to facilitate the superior electrochemical energy storage capacity of supercapacitor. The dendritic electrode with the core–shell structure had a high area-specific capacitance (1541 mF cm −2 at 1 mA cm −2 ), good rate capacitance (only 18.1% specific capacitance lost when the current density increased to 5 mA cm −2 ), as well as better electrochemical cycle stability (a capacitance retention of 72.1% after 5000 cycles at a high current density of 5 mA cm −2 ). The dendritic Co 3 O 4 @Co 2 (CO 3 )(OH) 2 and activated carbon as cathode and anode, respectively, were used to assemble an asymmetric supercapacitor, possessing the better area-specific capacitance of 87 mF cm −2 as well as well-deserved longevity retaining approximately 97.3% of initial capacitance even after 10,000 cycles at 1 mA cm −2 . The excellent properties stemmed from electro-active sites galore, strong adhesion between the core and shell, superior conductivity, as well as excellent ion transfer. The novel materials and feasible strategy are promising for next-generation hybrid supercapacitor with high performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Jian Liu,Zhanyu Li,Xiaogeng Huo,Jianling Li
Aluminium ion batteries are considered to be a promising development for large-scale energy storage and conversion applications. In this research, a nanosphere-rod-like Co 3 O 4 has been synthesized after the hydrothermal reaction and the subsequent heat treatment process , which is used for the cathode materials of aluminium ion batteries. The working mechanisms of the Co 3 O 4 are deeply investigated. It is found that the electrochemical deposition and dissolution of aluminum occurs on the surface of pure aluminium anode, and the Al 3+ cations are intercalated and de-intercalated in the cathode materials during the discharge and charge processes. The battery exhibits a high discharge specific capacity of 490 mAh g −1 at the first cycle, with the current density of 50 mA g −1 . Furthermore, the discharge capacity still maintains a high level of 122.1 mAh g −1 after 100 cycles at the current density of 200 mA g −1 , indicating a good cycle performance. Therefore, the nanosphere-rod-like Co 3 O 4 as the cathode for aluminium ion batteries has a promising potential.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 7
·4374-4382
·
IF 6.895
Xingmei Guo,Cheng Qian,Xiaohan Wan,Wei Zhang,Haowei Zhu,Junhao Zhang,Hongxun Yang,Shengling Lin,Qinghong Kong,Tongxiang Fan
Streptococcus thermophilus, a Gram-positive (G+) bacterium featuring a teichoic acid-rich cell wall, has been employed as both a phosphorus source and template to synthesize a biomorphic Co2P-Co3O4/rGO/C composite as an efficient electrocatalyst for the oxygen reduction reaction (ORR). Different from the conventional method for the synthesis of phosphides, bio-derivative phosphorus vapor was emitted from the inside out, which facilitated the in situ transformation of the chemically adsorbed Co precursor on the bacteria into Co2P-Co3O4 heterogeneous nanoparticles, which featured a Co2P-rich body and Co3O4-rich surface. Besides, reduced graphene oxide (rGO) was also introduced in the synthetic process to keep Co2P-Co3O4 scattered and further promote the electron transport efficiency. All the Co2P-Co3O4 nanoparticles and rGO sheets were supported on the bacteria-derived carbon substrate with submicron-spherical morphology. The as-obtained Co2P-Co3O4/rGO/C composite exhibited excellent electrocatalytic performance for ORR with onset and half-wave potentials of 0.91 and 0.80 V vs. RHE, respectively. Furthermore, its long-term stability and methanol tolerance were better than those of commercial Pt/C. Thus, this work presents a new strategy of using an interior bio-phosphorus source to obtain heterojunction particles featuring a phosphide-rich body and oxide-rich surface, which may provide some insights for the construction of efficient heterogeneous electrocatalysts.
研究领域:
材料科学
·
电化学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 12
·6241-6247
·
IF 7.79
Huan Wang,Zhonghua Sun,Xiaoran Zou,Jianhai Ren,Chun-yang Zhang
The rational construction of heterointerfaces in hollow nanohybrids is considered as a promising and challenging approach for enhancing their electrocatalytic performance. Herein, we demonstrate the synthesis of CoFe2Se4/NiCo2Se4 hybrid nanotubes (CFSe/NCSe HNTs) with open ends and abundant heterointerfaces. The CFSe/NCSe HNT hybrid nanotubes are obtained by using NiCo2-aspartic acid nanofibres (NiCo-Asp NFs) as the templates which can be converted to the CFSe/NCSe HNTs via proton etching, three metal coprecipitation, Kirkendall effect and anion-exchange reaction. The CFSe/NCSe HNTs may function as the oxygen evolution reaction (OER) electrocatalysts, and they exhibit a low overpotential of 224 mV at a current density of 10 mA cm−2 and outstanding stability with only 1.4% current density change even after 15 h, superior to those of the reported single-component counterparts. The obtained density of states and differential charge density confirm the existence of a heterointerface which can induce the accumulation of electrons at the interface of CFSe–NCSe and consequently increase the carrier density and electrical conductivity of the CFSe/NCSe HNTs. This research provides a new avenue for the fabrication of hollow nanohybrids with heterointerfaces.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2021
·
IF 0
Xinhong Li,Zihao Zhao,Hongchao Li,Jieshu Qian
Cobalt ferrite (CoFe 2 O 4 ) has been widely employed as a catalyst for the activation of peroxymonosulfate (PMS), in which hydroxyl radicals ( • OH) and sulfate radicals (SO 4 •− ) are generally recognized as the main reactive species responsible for the degradation of pollutants. In this study, we find that both one-electron transfer and oxygen-atom transfer reactions are involved in the CoFe 2 O 4 /PMS process, by using methyl phenyl sulfoxide (MPSO) as a chemical probe. Results from radical quenching and electron paramagnetic resonance (EPR) experiments indicate that the free radicals (i.e., • OH and SO 4 •− ) play only a minor role in the degradation of sulfamethoxazole (SMX). A mechanism involving Co(II)-PMS complex both on the surface of CoFe 2 O 4 and in solution as the dominant reactive species is proposed. Furthermore, the degradation performance of SMX under different conditions were investigated to further cognize the Co(II)-PMS complex-mediated oxidation process. This study broadens our understanding of the role of transition metal-based catalysts in the activation of PMS for the degradation of organic pollutants.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
FUEL
·
2025
·
IF 7.5
Zhenlu Zhao,Ke Lu,Song Song
The advancement of stable and highly efficient non-noble metal-based bifunctional electrocatalysts represents a formidable challenge in the realm of overall water splitting technology. In this study, CoMoO 4 ||CoMoP-based nanocolumn arrays were designed and synthesized using Co-doped molybdophoxide polyoxometalate (PMo), which is grown in situ on nickel foam (NF). Co doping is employed to conduct appropriate electronic modulation of Mo, thereby enhancing the hydrogen evolution reaction (HER) performance. When used in oxygen evolution reaction (OER), surface reconstruction is induced by electrochemical activation, in which the stable structure of PMo serves to balance the newly formed active OER amorphous metal hydroxy-oxide (hydroxide) compounds. The sample exhibits a HER overpotential of 96 mV and an OER overpotential of 234 mV at a current density of 10 mA·cm −2 . When utilizing CoMoO 4 ||CoMoP-based catalyst as both the cathode and anode assembly, the overall water splitting system can provide a current density of 10 mA·cm −2 at a driving voltage of merely 1.509 V, and can achieve long-term stability over 100 h, outperforming most previously reported bifunctional electrocatalysts. This work offers a promising approach for constructing high-performance bifunctional electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xuhuan Yang,Zining Zhou,Yueyuan Zou,Jiaqi Kuang,Dewei Ye,Shengsen Zhang,Qiongzhi Gao,Siyuan Yang,Xin Cai,Yueping Fang
Elaborate engineering of heterostructure and composition to regulate the electroactivities remains a pronounced challenge. Herein, a self-supported 2D/2D heterostructure monolith is constructed by interlinked FeCo-hydroxides nanosheets tightly interlacing with aligned Cu 0.76 Co 2.24 O 4 nanoplates. Due to the well-defined hierarchical nanoarrays and desirable interfacial coupling, the monolithic catalyst can guarantee the rapid charge transfer and mass transport pathways for accelerated surface kinetics, leading to manifestly improved electroactivities and stability toward trifunctional catalysis. Both experimental and theoretical calculations unravel the enriched multimetal active sites for intermediates adsorption and the synergistic interplay of the heterostructure to achieve enhanced catalytic efficiency. Consequently, the heterostructure catalyst contributes to high-performance rechargeable/flexible all-solid-stated Zn-air batteries and water electrolyzer with an ultralow potential of 1.51 V. Moreover, self-powered water splitting system driven by flexible Zn-air batteries delivers a high H 2 generation rate. This cost-effective heterostructure monolith could open an intriguing avenue for advancing all-in-one films toward portable energy conversion/storage.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 10
·5215-5221
·
IF 5.8
Yangdong Zhou,Junda Chen,Zhiyin Huang,Yuqin Peng,Lixin Xing,Chunmei Tang,Ning Wang,Ling Meng,Mingjie Wu,Lei Du,Siyu Ye
The cathodic oxygen reduction reaction (ORR) has been continuously attracting worldwide interest due to the increasing popularity of proton exchange membrane (PEM) fuel cells. So far, various Pt-group metal (PGM) or PGM-free catalysts have been developed to facilitate the ORR. However, there is still a gap to achieve the expected goals as proposed by the U.S. Department of Energy (DoE). Recently, PGM-free@PGM hybrid catalysts, such as the M/N/C@PtM catalyst, have achieved the milestones of oxygen reduction, as reviewed in our recent work. It is, nevertheless, still challenging to unravel the underlying structure–property relationships. Here, by applying different Pt/Co ratios, a series of Co/N/C@PtxCo catalysts are synthesized. Interestingly, the ORR activity and stability are not linear with the Pt content, but show a volcano-like curve with increased Pt usage. This relationship has been deeply unraveled to be closely related to the contents of pyrrolic N, pyridinic N, and graphitized carbon in catalysts. This work provides guidelines to rationally design the coupled PGM-free@PGM catalysts toward the ORR by appropriate surface engineering.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yuhu Feng,Mengran Lou,Luxiang Wang,Shengjiao Wen,Yang Wang,Ruiying Wang
Transition metal phosphides (TMPs) are often considered as a cost-effective replacement for precious metal catalysts in hydrogen evolution reaction (HER). Herein, the fibers are produced by combining coal with electrospinning technology, and then undergoing a pre-oxidation process for transforming into pre-oxidized coal-based fibers. Subsequently, CuCo-metal organic framework (CuCo-MOF) is grown on the pre-oxidized coal-based fibers using solvothermal method, and the Cu 3 P/Co 2 P/coal-based carbon fibers (Cu 3 P/Co 2 P/C-CFs) composite catalyst is successfully fabricated by phosphating at low temperature and carbonizing at high temperature. The uniformly grown nanoparticles (NPs) on the surface of C-CFs enhance the electrochemically active area, while the electron transfer between Cu 3 P and Co 2 P effectively modulates the electronic structure, increasing the catalytic activity of the catalyst for HER. In addition, the flexible C-CFs not only serve as self-supporting electrode but also effectively inhibit the agglomeration of Cu 3 P/Co 2 P NPs. Remarkably, the overpotential of Cu 3 P/Co 2 P/C-CFs is 83 mV at 10 mA cm −2 current density for HER in 0.5 mol L −1 H 2 SO 4 solution. This study presents promising strategies for the high value-added utilization of coal and the synthesis of highly effective non-precious metal catalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
InfoMat
·
2025
·
IF 22.3
Ziye Li,Yangfan Liu,Jiandong Hu,Wenhui Luo,Yang Wang,Zhao Xin,Yanlin Jia,Yong Pang,Hong Zhang,Zhi Liang Zhao,Yejun Li,Qi Wang
Developing cost-effective and highly efficient oxygen evolution reaction (OER) electrocatalysts that operate in both acidic and alkaline media is crucial for industrial electrocatalytic water splitting. However, achieving high performance under dual pH conditions remains a significant challenge. Herein, we report the synthesis of multi-sized RuO 2 sub-nanoclusters on Co 3 O 4 nanoarrays via a facile method, which demonstrates exceptional OER activity in both acidic and alkaline environments. The optimized catalyst exhibits remarkably low overpotentials of 165 mV in 0.5 M H 2 SO 4 and 223 mV in 1 M KOH at a current density of 10 mA cm −2 , respectively. Additionally, it exhibits outstanding stability, maintaining performance over a 10-h continuous operation, which is attributed to the robust structural stability of the dispersed RuO 2 sub-nanocluster morphology. Atomic-scale investigations reveal a layer-by-layer growth mechanism of Ru on the Co 3 O 4 substrate, transitioning from single atoms to monolayer clusters and ultimately to sub-nanoclusters as Ru loading increases. This growth mechanism provides a rational strategy for the precise design and synthesis of advanced cluster-based catalysts. Density functional theory (DFT) calculations further elucidate the strong oxide-support interactions between RuO 2 clusters and the Co 3 O 4 matrix, facilitating electron transfer from RuO 2 to Co 3 O 4 and generating an electron-deficient region. This electronic modulation enhances –OH adsorption and accelerates OER kinetics. These findings underscore the potential of metal sub-nanoclusters for designing highly efficient and durable electrocatalysts for water electrolysis.
研究领域:
电化学
·
催化材料
·
能源转换与存储
✓ 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）