CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Lele Yang,Hong Chen,Yuntao Xu,Rong Qian,Qiao Chen,Yuanxing Fang
The efficiency of hydrogen peroxide evolution reaction (H 2 O 2 ER) by photoanodic water oxidation is normally limited by low yield and poor selectivity. In this work, the surfaces of Mo doped BiVO 4 are modified by Co 2+ and PO 4 3- ions (CPMB), which has been used as the photoanode with improved H 2 O 2 yield and selectivity. The optimal evolution rate of the CPMB is ca. 0.23 µmol·min −1 ·cm −2 , corresponding to 2.5 times to the pristine BiVO 4 photoanode, and the faradaic efficiency of CPMB photoanode for H 2 O 2 ER is ca. 26%. In this study, the mechanism for the improved H 2 O 2 evolution performance of CPMB has been investigated, indicating that PO 4 3- ions mainly promote the formation of the •OH by dissociation of H 2 O, while Co 2+ ions accelerate the conversion of the •OH for the subsequent H 2 O 2 evolution. This study offers the strategy for designing an efficient photoelectrochemical system with optimized solar conversion efficiency for H 2 O 2 production.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 32
·17045-17052
·
IF 6.895
Jun Xu,Changji Fang,Zhiqian Zhu,Jingwen Wang,Bansui Yu,Junjun Zhang
Two-dimensional (2D) lamellar ReS2 nanosheets are considered a promising electrocatalyst for the hydrogen evolution reaction (HER) but suffer from poor intrinsic conductivity and catalytically inert basal planes. In this work, sub 50 nm hierarchical Mo-doped ReS2 nanospheres consisting of numerous few-layered and defect-rich nanosheets are designed and synthesized as robust and efficient HER catalysts. On the one hand, the small size of the hierarchical structure, the disordered basal planes and the expanded interlayer endow the nanosheets with plentiful defects, thereby resulting in abundant exposed active sites. On the other hand, Mo-doping offers the nanosheets with some electronic benefits of unsaturated electrons, improved intrinsic conductivity, and optimized hydrogen adsorption free energy (ΔGH) of the basal planes. Owing to the synergistic effects, the 10%Mo-ReS2 catalyst exhibits an optimized catalytic activity with striking kinetic metrics of a small Tafel slope of 62 mV dec−1, a low overpotential of 81 mV at 10 mA cm−2, and a long operation stability of 50 h, and its performance is among the best of ReS2-based catalysts. This work provides a new approach for gaining the structural and electronic benefits of ReS2 catalysts by combinational nanoscale engineering and heteroatom doping.
研究领域:
材料科学
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 6
·3014-3025
·
IF 3.9
Cheng Li-Qian,Pan Jingye,Chen Kai,Hao Xuxia,Xie Xinyuan,Dong Xinrui,Wang Zixuan,Liu Ruiping,Feng Ming
TiNb 2 O 7 (TNO) is a promising anode for lithium-ion batteries owing to its high theoretical capacity, minimal volume expansion, and effective suppression of lithium dendrite formation. Nonetheless, the low electrical conductivity of TNO presents a barrier to practical application. Thus, a Mo 6+ doping strategy was utilized to address the conductivity issue, and TNO- x Mo ( x = 0, 0.05, 0.10, 0.15, 0.20) anodes were prepared by a solid-state method. The incorporation of Mo 6+ ions result in a charge redistribution, which can elevate electronic conductivity and accelerate ion diffusion. What’s more, by precisely controlling the Mo 6+ ion concentration can regulate the morphologies of the TNO, enabling it to expose more fast-ion conducting (020) facets. The synergistic effect of the above two factors significantly enhances the conductivity and electrochemical properties of the TNO anode. As a result, the optimal TNO-0.05Mo with 2D lamellar structure exhibits a high discharge capacity of 347.6 mAh g −1 at 0.1C, superior rate performance, and an excellent cycle lifespan, with retention of 78% after 1500 cycles at 1.5C/1.5C. Meanwhile, the solid-state battery with TNO-0.05Mo as anode also displays improved rate and cycle performance than the liquid-state battery, indicating the great application potential for the next-generation energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2023
·
IF 3.5
Guo-li Chen,Huai-yao Wang,Yong-zhi Liu,Xiao-ming Huang,Guang-ming Yin
In this paper, nanowool ball Ni 3 Se 2 , rod NiSe and multistage Ni 3 Se 2 were prepared. Multilevel Ni 3 Se 2 was doped with Fe, Co and Mo respectively to prepare composite catalysts. The prepared materials were characterized by UV, XRD, SEM-EDS and XPS . The results show that the composite catalysts with multi-level Ni 3 Se 2 and Mo have special morphology and high purity. The HER performance of the composites was tested using an electrochemical workstation, and the results show that at a current density of 10 mA cm −2 , the overpotentials of Ni 3 Se 2 , Ni 3 Se 2 /Fe, Ni 3 Se 2 /Co and Ni 3 Se 2 /Mo are 71, 71, 3 and 37 mV, respectively; At a current density of 100 mA cm −2 , their overpotentials are 396.9, 373.6, 321.8 and 290.1 mV, respectively. Their Tafel slopes are 227, 169, 145 and 137 mV dec −1 , respectively. The R ct s of Ni 3 Se 2 , Ni 3 Se 2 /Fe, Ni 3 Se 2 /Co and Ni 3 Se 2 /Mo are 1.63, 1.47, 1.15 and 0.90Ω, respectively. After the comparison of the electrochemical HER performance, it is found that the Ni 3 Se 2 /Mo composite catalyst has good HER 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 Materials Chemistry A
·
2017
·Vol. 5
·期 8
·4075-4083
·
IF 8.867
Qiang Chen,Fengqi Lu,Ying Xia,Hai Wang,Xiaojun Kuang
New conceptions of developing various nanostructure materials supported on conductive substrates are urgently required for additive-free integrated electrodes for lithium ion batteries (LIBs). In this work, Mo-doped SnS2-based nanosheets were directly grown on a conductive substrate, carbon cloth, via a facile hydrothermal method. Significantly, the as-synthesized samples possess a three-dimensional network structure consisting of interconnected nanosheets, which can be directly employed as additive-free integrated electrodes for LIBs. The as-obtained CC@Sn0.9Mo0.1S2 nanosheets exhibit initial high discharge and charge capacities of 2033.6 and 1869.8 mA h g−1 at a current density of 1 A g−1, with a coulombic efficiency of 91.9%. A high reversible discharge capacity of 1950.8 mA h g−1 is obtained after 200 cycles. Moreover, a high reversible capacity of 914.5 mA h g−1 is achieved even at a high current density of 5 A g−1, which significantly exceeds the theoretical capacity of commercial graphite and reversible capacity of SnS2. A full lithium ion battery was assembled composed of the CC@Sn0.9Mo0.1S2 anode and a commercial LiCoO2 cathode, which also delivered high capacity and cycling stability. The excellent electrochemical lithium storage performance of Mo-doped SnS2 could be attributed to the molybdenum doping, which limited the number of layers of the nanosheets, enlarged the interlayer spacing and generated rich defects.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2022
·
IF 3.752
Peijie Weng,Qing Cai,Linfeng Zhang,Huadong Wu,Kun Wu,Jia Guo
In this study, the Mo -doped hollow hierarchical Bi/BiOBr microspheres are prepared by the solvothermal method with the Sn 2+ as reductant. The prepared composites show a good degradation effect for ciprofloxacin (CIP) under visible light. Especially, the BSM-22 composite show the best photocatalytic activity, with the apparent rate constant k as high as 0.03014 min −1 , which is 26.9 times that of the pure BiOBr. It is assumed that the introduction of Sn 2+ facilitate the formation of hollow hierarchical microspheres structure of BiOBr microspheres and the appearance of metallic Bi on the surfaces. Therefore, the transfer and separation efficiency of photogenerated charges is increased in the composites. Impressive, benefit from the microtopography of the hollow structure, the specific surface area of the BSM-22 (53.476 m 2 /g) is 21.76 times than that of the BiOBr (2.458 m 2 /g). The doping of Mo reduces the band gap of BiOBr (exactly from 2.61 to 1.96 eV) and broaden the photoabsorption region. Therefore, the photocatalytic activity of the Mo -doped Bi/BiOBr microspheres are heavily improved in dealing with different kinds of antibiotic molecules. More importantly, these results show that the design strategies of heteroatom doping, metal bismuth production, and morphology control of the bismuth oxybromide composite can greatly improve the visible-light catalytic activity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yufa Feng,Xuefeng Zhang,Youxiang Shao,Xiaodong Chen,Huize Wang,Junhao Li,Ming Wu,Huafeng Dong,Quanbing Liu,Hao Li
Rational construction of inexpensive, highly efficient, and stable catalysts for ammonia borane (AB) methanolysis is in high demand but still remains a great challenge. In this work, we have successfully fabricated uniform Mox–Ni0.8Cu0.2O nanowires using a simple hydrothermal method followed by a post-calcination treatment and flexibly modulated the acidity of their surface by changing the amount of Mo introduced into Ni0.8Cu0.2O. The Mo0.1–Ni0.8Cu0.2O catalyst displayed strong catalytic activity toward AB methanolysis with an ultrahigh turnover frequency of 46.9 molH2 molcat.–1 min–1, which is even higher than some noble metal catalysts. In this work, an equation regarding the relationship between the quantity of moderated acid sites of catalysts and its corresponding activity toward AB methanolysis was first determined. A plausible mechanism for AB methanolysis catalyzed by Mox–Ni0.8Cu0.2O was proposed, and the benefits of the introduction of MoO3 to Ni0.8Cu0.2O for enhancing the catalytic performance were also discussed. These findings can form a basis for the rational construction of inexpensive catalysts with robust performance toward AB methanolysis for hydrogen production.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Wangqiong Xu,Beituo Liu,Shubiao Xia,Lijuan Chen,Ruijuan Qi,Qiling Li,Shimei Guo,Feixiang Cheng,Rong Huang,Zhe Li
Mo doping plays a striking role in the stability enhancement of LiMn 2 O 4 cathode materials. However, the underlying microscopic mechanism is still unclear. Here, we elucidate that the relationship between the atomic position of Mo doping in LiMn 2 O 4 and the stability enhancement of Mo-doped LiMn 2 O 4 by utilizing the spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM). It exhibits that the part of Mo 6+ ions occupy empty Mn 16c site to form a surface reconstructed layer of rock-salt like phase on the outermost surface and other Mo 6+ ions dope into the Mn octahedral 16d sites to form LiMo x Mn 2-x O 4 in bulk, which is beneficial for inhibiting the parasitic side reactions. Concomitantly, this dual modification of bulk structure and surface can significantly enhance electrode reversibility and Li + diffusion. As a result, excellent long cycling stability of the as-designed optimal LiMo 0.01 Mn 1.99 O 4 after 1500 cycles with 61.61 % capacity retention at 10 C (1 C = 148 mAh g −1 ) is presented, with an initial discharge capacity of 88.30 mAh g −1 . Our research provides a clever approach for regulating the surface structure/bulk architecture in LiMn 2 O 4 cathode materials.
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 MATERIALS SCIENCE
·
2019
·Vol. 55
·期 3
·1117-1125
·
IF 3.442
Han Jishu,Liu Ying,Wang Ying,Zhao Ruiyang,Wang Lei
The development of novel photocatalyst is an important issue for improving the photocatalytic hydrogen production efficiency. Herein, novel aqueous ternary Cd x Mo 1− x Se quantum dots (QDs) are prepared with five ratios ( x = 0, 0.5, 0.67, 0.75, 1) by modulating the metal content. Experimental results show that the doping of Mo promotes the photoinduced electrons transfer and decreases the photoinduced electron–hole pairs recombination. Compared with the CdSe QDs, Cd 0.75 Mo 0.25 Se QDs, Cd 0.5 Mo 0.5 Se QDs and MoSe 2 QDs, Cd 0.67 Mo 0.33 Se QDs exhibit significantly enhanced photocatalytic activity, and the amount of H 2 production comes up to 911.1 μmol in 7 h. Meanwhile, the Cd 0.67 Mo 0.33 Se QDs display substantially high stability in recycling test, which facilitates the utilization of ternary QDs in the photocatalytic hydrogen production application.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Zhiwei Li,Huiting Huang,Wenjun Luo,Yingfei Hu,Rongli Fan,Zhi Zhu,Jun Wang,Jianyong Feng,Zhaosheng Li,Zhigang Zou
Electrochemical treatment is a popular and efficient method for improving the photoelectrochemical performance of water-splitting photoelectrodes. In our previous study, the electrochemical activation of Mo-doped BiVO 4 electrodes was ascribed to the removal of MoO x segregations, which are considered to be surface recombination centers for photoinduced electrons and holes. However, this proposed mechanism cannot explain why activated Mo-doped BiVO 4 electrodes gradually lose their activity when exposed to air. In this study, based on various characterizations, it is suggested that electrochemical treatment not only removes partial MoO x segregations but also initiates the formation of H y MoO x surface defects, which provide charge transfer channels for photogenerated holes. The charge separation of the Mo-doped BiVO 4 electrode was significantly enhanced by these charge transfer channels. This study offers a new insight into the electrochemical activation of Mo-doped BiVO 4 photoanodes, and the new concept of surface charge transfer channels, a long overlooked factor, will be valuable for the development of other (photo)electrocatalytic systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Liang Qiao,Qi You,Xinyuan Wu,Huihua Min,Xiaomin Liu,Hui Yang
The Ni-rich Co-poor layered cathode (LiNixCoyMn1–x–yO2, x ≥ 0.9) is a candidate for the next-generation lithium-ion batteries due to its high specific capacity and low cost. However, the inherent structural instability and slow kinetics of Li+ migration hinder their large-scale application. Mo doping is proposed to enhance the crystal structure stability of LiNi0.9Co0.05Mn0.05O2 and to ensure the preservation of the spherical secondary particles after the cycle. The characterization results indicate that Mo doping not only significantly relieves the lattice strain accompanied by H2 → H3 phase transition but also alleviates particle stress accumulation to avoid pulverization. The Mo-modification allows the generation of uniform fine primary particulates and further agglomeration into the smooth secondary particles to inhibit electrolyte penetration. Hence, the Mo-modified sample NCM90-1%Mo displays an excellent capacity retention of 85.9% after 200 cycles at 0.5 C current density, which is 23.8% higher than that of the pristine NCM90. In addition, with the expansion of the Li slab to accelerate Li+ diffusion and the fine primary particles to shorten the Li+ pathway, the NCM90-1%Mo sample exhibits a high discharge capacity of 150 mAh g–1 at 5 C current density. This work provides a new thought for the design and construction of high-capacity cathode materials for the next-generation lithium-ion batteries.
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
MOLECULES
·
2025
·Vol. 30
·期 1
·177
·
IF 4.6
Zhi Lu,Yifan Guo,Shilin Li,Jiaqi Ding,Yingzi Ren,Kun Tang,Jiefeng Wang,Chengxin Li,Zishuo Shi,Ziqi Sun,Hongbo Meng,Guangxin Wang
Water electrolysis is a promising path to the industrialization development of hydrogen energy. The exploitation of high-efficiency and inexpensive catalysts become important to the mass use of water decomposition. Ni-based nanomaterials have exhibited great potential for the catalysis of water splitting, which have attracted the attention of researchers around the world. Here, we prepared a novel Mo-doped NiFe-based layered double hydroxide (LDH) with a nanoarray microstructure on Ni foam. The doping amount of Mo can significantly change the microstructure of the electrocatalysis, which will further affect the oxygen evolution reaction (OER) performance of water splitting. This novel nanomaterial required only an overpotential of 227 mV for 10 mA cm−2and a Tafel slope of 54.8 mV/dec in 1 M KOH. Meanwhile, there was no Mo, and the NiFe-LDH needed 233 mV to attain to 10 mA cm−2. Compared to the NiFe-LDH without Mo, the NiFeMo-LDH nanosheet arrays exhibited enhanced activities with 17.1 mV/dec less Tafel in OER. The good performance of the electrocatalyst is ascribed to the special nanosheet arrays and the heterostructure of the Ni-Fe-Mo system. These features help to increase the active surface, enhancing the efficient charge transfer and the reactive activity in OER.
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
危险品化学品经营许可证（带存储）