ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiaodan Wang,Chao Wang,Fengyu Lai,Hongxia Sun,Nan Yu,Baoyou Geng
Highly efficient and stable dual-function electrocatalysts for overall water splitting are of great significance to promote the application of hydrogen energy. Constructing a bimetallic phosphide nanocomposite structure can enhance active sites and accelerate electron transfer, which is beneficial to electrocatalysis. Herein, we obtained self-supporting cobalt-iron phosphide nanosheets supported on foamed nickel through two-step hydrothermal and phosphating treatment. When the CoFe-P/NF-1 electrode material reaches 100 mA cm–2, only a HER overpotential of 180 mV is required. Moreover, the overpotential for OER is 275 mV at 200 mA cm–2. The overall water splitting electrolyzer assembled by CoFe-P/NF-1 can reach a current of 10 mA cm–2 at 1.57 V. The catalytic performance is better than the currently reported transition metal-based catalysts, and it exhibits excellent stability. This work provides a design idea of transition metal phosphide used in overall water splitting catalysis.
研究领域:
材料科学
·
电化学
·
能源材料
·
催化
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Haiyun Tong,Shuai Lin,Hanlu Zhang,Xin Wang,Yanan Huang,Bangchuan Zhao,Xuebin Zhu,Yuping Sun
The present work reports oxygen evolution reaction (OER) activity in metallic V 4 AlC 3 bulk powders prepared by solid-state reactions for the first time. An ultralow overpotential of 253 mV at the current density of 10 mA cm −2 and an excellent stability are observed, demonstrating that V 4 AlC 3 bulk powder can be used as an excellent new type of OER catalyst with low-cost for mass production.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
H.A. Younus,M. Vandichel,N. Ahmad,E. Ahlberg,M. Busch,F. Verpoort
Water oxidation is traditionally performed over IrO 2 and RuO 2 owing to their high stability at low pH compared to molecular O 2 evolution catalysts. The low stability of molecular complexes in acids limits their industrial exploitation as anodes in water-splitting devices, where high current densities and proton conductivity are required. Herein, an existing Co(1,10-phenanthroline) 2 complex film is engineered to improve its pH-stability via extra OH substituents on the ligand, i.e. 1,10-phenanthroline-4,7-diol. This novel Co(1,10-phenanthroline-4,7-diol) 2 complex film is active for water oxidation at low overpotentials and stable at low pH. Since the calculated water oxidation overpotentials of both complexes are similar, the difference in water oxidation activity is attributed to a smaller charge transfer resistance, which originates from a different anchoring style to the electrode via the OH groups of the ligand. This result is supported by electrochemical impedance measurements. The high pH-stability of the Co(1,10-phenanthroline-4,7-diol) 2 film is computationally rationalized by a high crystal formation energy observed in DFT calculations. In summary, an acid-stable and active cobalt-based metal-organic film is reported that competes well with most reported earth-abundant catalysts for water oxidation under similar conditions.
研究领域:
化学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jiameng Sun,Bin Yu,Fuquan Tan,Wanfeng Yang,Guanhua Cheng,Zhonghua Zhang
The synthesis of cost-effective and high-performance electrocatalysts for water splitting is the main challenge in electrochemical hydrogen production . In this study, we adopted a high throughput method to prepare bi-metallic catalysts for oxygen/hydrogen evolution reactions (OER/HER). A series of Ni–Mo alloy electrocatalysts with tunable compositions were prepared by a simple co-sputtering method. Due to the synergistic effect between Ni and Mo, the intrinsic electrocatalytic activity of the Ni–Mo alloy electrocatalysts is improved, resulting in excellent HER and OER performances. The Ni 90 Mo 10 electrocatalyst shows the best HER performance, with an extremely low overpotential of 58 mV at 10 mA cm −2 , while the Ni 40 Mo 60 electrocatalyst shows an overpotential of 258 mV at 10 mA cm −2 in OER. More significantly, the assembled Ni 40 Mo 60 //Ni 90 Mo 10 electrolyzer only needs a cell voltage of 1.57 V to reach 10 mA cm −2 for overall water splitting .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 4
·2117-2122
·
IF 0
Peng Zehui,Xue Yumeng,Gao Yuan,Wang Ka,Song Haizeng,Yan Shancheng
Heavy metal Cadmium (Cd) will continuously pollute the atmosphere, soil and various water environments through material circulation, and even pose a threat to human safety. It has been designated as a first-class pollutant in sewage by China, therefore there is an urgent need to find
new, more effective, and low-cost method to accurately detect Cadmium ion (Cd2+) concentration. We experimentally prepared a new Cd2+ sensor based on NiS2 nanomaterials capable of measuring Cd2+ concentration. The corresponding relationship between
over potential of NiS2 nanomaterials in H2SO4 electrolyte solutions with different Cd2+ concentration and reduction peak with change of Cd2+ concentration was obtained by electrochemical method.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yichao Zhuang,Dongzheng Wu,Fei Wang,Yaoqi Xu,Jing Zeng,Jinbao Zhao
The development of high-voltage Mg metal batteries is hampered by the incompatibility between a Mg metal anode and conventional electrolyte, leading to a high overpotential for Mg plating/stripping processes. In this work, we tailored a hybrid functional layer consisting of Bi/MgCl2/polytetrahydrofuran (PTHF) by an in situ THF polyreaction during the reaction of the Mg anode with BiCl3 solution. The introduction of PTHF inhibits the growth of Bi particles and fills the layer interstice with MgCl2-containing PTHF, improving the structural integrity of the functional layer and insulation between the electrolyte and Mg anode. As a result, compared to a simply modified Bi/MgCl2 layer, the Bi/MgCl2/PTHF functional layer exhibits a lower polarization voltage of 0.25 V and longer cycling life of more than 2000 h at 0.1 mA cm–2. Mechanism analysis shows that Mg is plated on the surface of Bi particles within the layer. The Mo6S8/Mg full battery with the hybrid functional layer achieved a low voltage hysteresis of ∼0.25 V and long cycling life over 500 cycles at 50 mA g–1. This work provides a facile and effective hybrid functional layer strategy to realize Mg metal batteries in conventional electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yangyang Wang,Xue Wang,Bingcheng Ge,Jianxin Guo,Carlos Fernandez,Qiuming Peng
The Li–CO2 battery is a potential energy storage device that not only possesses a theoretical energy density as high as 1876 W h kg–1 but also alleviates the consumption of fossil resources by converting the greenhouse gas CO2 into electric energy. However, some technique bottlenecks, such as high overpotential, low recyclability, and low energy density, severely prohibit its application rhythm. Here, we prepare a binder-free MXene–MnO2 composite film using vacuum-assisted filtration and in situ reduction, which can be used as a freestanding cathode for Li–CO2 batteries. This MXene–MnO2 film electrode bestows good cycle stability (∼220 cycles), high specific capacity, and lower overpotential (∼0.89 V) in Li–CO2 batteries. Both experimental tests and first-principles calculations reveal that the enhanced electrochemical properties are associated with three aspects. First, the MXene–MnO2 film offers a high electrical conductivity and porous structure, which provide fast transport channels for electrons and ions. Then, the replacement of Mn by Ti increases the adsorption of Li ions, which facilitates the rapid decomposition of Li2CO3. Finally, the synergistic effect of MXene and MnO2 exposes a large number of active sites, which increases the capacity of Li–CO2 batteries. Therefore, this self-supporting strategy on the MXene composite paves a way to develop high-performance Li–CO2 batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2021
·
IF 3.626
Jin-Feng Jia,Shen-Jing Ji,Nian-Tzu Suen
Ti 2 Cu, TiCu and TiCu 4 were synthesized and their electrocatalytic activities for hydrogen evolution reaction (HER) were investigated. The hydrogen overpotential observed at 10 mA/ cm 2 ( η 10 ) followed the order Ti 2 Cu ( η 10 = −215 mV) > TiCu ( η 10 = −182 mV) > TiCu 4 ( η 10 = −170 mV). The hydrogen adsorption energy (∆G Had ) on Cu site of TiCu 4 is exergonic and close to optimal position (i.e. ∆G Had = 0). A synergistic effect was proposed to account for the excellent HER performance of these Ti Cu binary intermetallics compounds that could replace PGM and achieve Midas touch in the future.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 40
·22892-22900
·
IF 12.732
Pan Xu,Xin Li,Mei-Yan Yan,Hong-Bin Ni,Hai-Hong Huang,Xiao-Dong Lin,Xiao-Yu Liu,Jing-Min Fan,Ming-Sen Zheng,Ru-Ming Yuan,Quan-Feng Dong
Metallic sodium is considered the most likely anode material to replace metallic lithium owing to its high theoretical capacity, abundant reserves, and low cost. However, the uneven deposition and agglomerate deposition of Na often result in low coulombic efficiency and inferior lifetime during cycling. Here, by phosphorizing treatment, a sodiophilic phosphorized copper mesh (PCM) has been achieved as the metallic sodium-host current collector for the first time; then through in situ electrochemical reaction construct, sodiophilic Na–Cu–P composite layer, which has a fast electronic/ionic conductivity and strong adsorption ability with sodium, thereby greatly mitigating electrodeposition overpotential for improving Na plating/stripping behaviors. Meanwhile, the cross-linked mesh skeleton significantly diminishes the local current density, thus achieving highly reversible Na plating/stripping behavior with dendrite-free and “dead Na”-free. Consequently, the PCM electrode can maintain a high coulombic efficiency (∼99.96%) over 1000 cycles at 5 mA cm−2 and exhibit an ultra-low electrodeposition overpotential from 0.5 mA cm−2 to 10 mA cm−2 in a half-cell. Similarly, the symmetrical cell displays superior cycling stability with low overpotential. Furthermore, the PCM@Na anode delivers excellent cycling/rate performance when paired with Prussian blue (PB) cathode in full-cell.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2019
·Vol. 62
·期 6
·727-731
·
IF 6.085
Zeng Xuecen,Zhang Xuejing,Liu Shuang,Yang Hao,Tao Zhanliang,Liang Jing
The γ-MnO 2 @CNT catalyst was prepared by in situ solid phase synthesis and first applied into sodium-air batteries (SABs). The initial discharge specific capacity of SABs with γ-MnO 2 @CNT catalyst can reach 8804 mA h g −1 and the overpotential gap is only 140 mV, which is better than the batteries that is catalyzed by α-MnO 2 @CNT and pure CNT. Besides, the batteries also exhibit excellent cycle performance, which can keep relatively stable for 246 cycles at 500 mA g −1 and 140 cycles at 1000 mA g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zichen Xu,Chia-Lin Yeh,Yuanjuan Jiang,Xinru Yun,Chun-Ting Li,Kuo-Chuan Ho,Jiann T. Lin,Ryan Yeh-Yung Lin
A series of orientation-adjustable metal–organic framework (MOF) nanorods, CoFe(dobpdc)-I to CoFe(dobpdc)-III (dobpdc = 4,4′-dihydroxybiphenyl-3,3′-dicarboxylate), is developed on a 3D nickel foam (NF) template. By modulating the solvent composition for synthesis, the feature of MOF nanorods on the template can be varied from disorganized to a unidirectional orientation perpendicular to the NF. Well-aligned, vertically oriented CoFe(dobpdc)-III nanorods are hydrophilic and have more exposed active sites and interfacial charge transfer ability. Consequently, they exhibit a superior activity for oxygen evolution reaction (OER) with ultralow overpotentials of 176 and 240 mV at 10 and 300 mA cm–2 in 1.0 M KOH (aq), respectively. CoFe(dobpdc)-III also shows a record low overpotential of 204 mV at J10 mA cm–2 among the electrocatalysts based on CoFe MOF and an excellent overpotential at a high current density (100 mA cm–2) of 312 mV in 0.1 M KOH (aq). This is the first report of a convenient method to straighten up MOF nanorods on a template for highly efficient OER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 22
·13639-13644
·
IF 4.036
Jiyu Li,Zeyan Wang,Peng Wang,Zhaoke Zheng,Yuanyuan Liu,Hefeng Cheng,Baibiao Huang
In this study, a novel NiCoP–CeO2 composite was constructed on a Ni foam by a simple hydrothermal method and thermal phosphating strategy. In the OER test, NiCoP–CeO2 exhibited a low overpotential of 217 mV at 10 mA cm−2, 45 mV dec−1 of Tafel slopes. With the help of theoretical calculations and experimental characterization, the reason for performance improvement was analyzed in depth. The results show that CeO2 leads to a confinement effect, maintaining the nanosheet morphology of NiCo-LDHs, which contributes to sustaining the catalyst in favourable contact with H2O and minimizing the OER potential. Furthermore, by loading CeO2 onto NiCoP, the hydrophilicity of the catalyst is significantly enhanced. Our work provides an ingenious synthesis strategy for the preparation of efficient and inexpensive electrocatalytic materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）