APPLIED PHYSICS LETTERS
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2024
·Vol. 124
·期 24
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IF 3.5
Chen Wenkang,Wu Xiangshui,Deng Shichen,Yang Nuo,Xu Xiangfan
Strain provides an additional mechanism in tuning the thermal/electrical properties of nanostructures and therefore has triggered lots of interest in recent years. However, experimental research about the strain effect on the thermal conductivity of nanowires is still limited, especially in the low-temperature range, which is important in understanding the physics of strain-induced regulation in thermal conductivity. Here, we present thermal transport measurements of bent silicon carbide nanowires at temperatures ranging from 20 to 300 K. Reduction in thermal conductivity compared to their straight counterparts is observed. More specifically, the relative change is up to 55% at 20 K and descends with temperature, which is due to the inhomogeneous strain-induced phonon scattering. This study will deepen the understanding of thermal properties in nanostructures with strain.
CAS / MDL:
研究领域:
材料科学
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热物理
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 15
·8364-8370
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IF 14.511
Qiqi Mao,Kai Deng,Wenxin Wang,Peng Wang,You Xu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Porous Pd-based metallene with highly curved, ultrathin and porous architectural features is a promising candidate for the hydrogen evolution reaction (HER), and structural design and component modification can effectively enhance its performance. Herein, we present a powerful approach to boost the HER performance of porous PdIr bimetallene through N-doping, which can effectively modulate the electronic structure and induce the strain effect of the designed N-doped porous PdIr bimetallene (N-PdIr bimetallene). The porous N-PdIr bimetallene exhibits superior all-pH HER activity and stability. To generate a cathodic current density of 10 mA cm−2, the required overpotential for the porous N-PdIr bimetallene is 26, 34 and 59 mV in 0.5 M H2SO4, 1 M KOH and 1 M phosphate buffer solution (PBS), respectively, which outperform those of commercial Pt/C. The proposed N-doping approach is a very powerful strategy for boosting metallene electrocatalytic performance, beyond the HER.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 25
·3655-3661
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IF 3.1
Ningkang Qian,Degong Ding,Liang Ji,Junjie Li,Hui Zhang,Deren Yang
Lattice engineering is a powerful strategy not only to optimize electrocatalytic performances, but also to deepen the understanding of electrocatalytic mechanisms. Lattice engineering can be effectively achieved in core–shell nanocrystals owing to the lattice mismatch of heterostructures. Herein, we constructed three kinds of icosahedra consisting of Au73Pd27@Pt, Au66Pd34@Pt and Pd@Pt core–(interlayer)–shell by a seed-mediated method. The introduction of an ultrathin Pd interlayer in the Au66Pd34@Pt icosahedra enables us to separately identify the strain effect and ligand effect. The specific activities towards the EOR of these icosahedra are in the sequence Au73Pd27@Pt > Au66Pd34@Pt > Pd@Pt, indicating that both the ligand effect and strain effect caused by Au can enhance the activity of Pt towards the EOR. The in situ FTIR studies confirm that the EOR processes on these icosahedra are all dominated by the C2 pathway, and hence we ascribe the enhancements of EOR activities to the faster kinetics of the C2 pathway by producing acetate or acetaldehyde.
研究领域:
材料科学
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电催化
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纳米技术
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Junru Liu,Qiushi Wang,Liang Chen,Jun Zhang,Jiemiao Pan,Xiaomin Wang,Zhaoping Liu
The choice of anode materials for high-voltage aqueous batteries beyond 1.5 V is still far from satisfactory, due to the narrow electrochemical stability window of aqueous electrolytes . With the inherent advantages of low working voltage and fast ionic diffusion, niobium phosphates with polyanionic framework groups built of NbO 6 octahedra and PO 4 tetrahedra are very promising anode materials for high-voltage aqueous batteries. Herein, carbon-coated NbOPO 4 (NPO/C) materials with monoclinic structure has been prepared by the solid-state reaction & chemical vapor deposition method. Between -1.34 V and 0.6 V vs. standard hydrogen electrode, it could deliver a specific capacity of 116 mAh/g with a high coulombic efficiency of 92.0% at a low current rate of 0.33C in aqueous electrolytes based on methylsulfonylmethane, LiClO 4 and H 2 O (DES). The diffusion-controlled process dominates the electrochemical reaction of NPO/C. Upon the reversible insertion/extraction of lithium ion into/from NPO/C, it maintains the monoclinic structure with a small lattice expansion, which is a characteristic of zero-strain effect. Finally, the full cell based on NPO/C anode, LiMn 2 O 4 cathode and DES electrolytes with a high specific energy 101.6 Wh/kg and a high voltage output beyond 2 V has been validated. It also shows excellent cycling performance with the capacity retention of 94.3% after 1000 times at 2C rate, which suggests that monoclinic β-NbOPO 4 can be used as a promising electrode material for aqueous lithium-ion batteries with high voltage output for energy storage in the future.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
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2020
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IF 14.612
Jie Li,Guangming Zhan,Jianhua Yang,Fengjiao Quan,Chengliang Mao,Yang Liu,Bo Wang,Fengcai Lei,Lejing Li,Alice W. M. Chan,Liangpang Xu,Yanbiao Shi,Yi Du,Weichang Hao,Po Keung Wong,Jianfang Wang,Shi-Xue Dou,Lizhi Zhang,Jimmy C. Yu
The limitations of the Haber–Bosch reaction, particularly high-temperature operation, have ignited new interests in low-temperature ammonia-synthesis scenarios. Ambient N2 electroreduction is a compelling alternative but is impeded by a low ammonia production rate (mostly <10 mmol gcat–1 h–1), a small partial current density (<1 mA cm–2), and a high-selectivity hydrogen-evolving side reaction. Herein, we report that room-temperature nitrate electroreduction catalyzed by strained ruthenium nanoclusters generates ammonia at a higher rate (5.56 mol gcat–1 h–1) than the Haber–Bosch process. The primary contributor to such performance is hydrogen radicals, which are generated by suppressing hydrogen–hydrogen dimerization during water splitting enabled by the tensile lattice strains. The radicals expedite nitrate-to-ammonia conversion by hydrogenating intermediates of the rate-limiting steps at lower kinetic barriers. The strained nanostructures can maintain nearly 100% ammonia-evolving selectivity at >120 mA cm–2 current densities for 100 h due to the robust subsurface Ru–O coordination. These findings highlight the potential of nitrate electroreduction in real-world, low-temperature ammonia synthesis.
研究领域:
化学工程
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电催化
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
XiaShuang Luo,CeHuang Fu,Zulipiya Shadike,Lu Ma,Lu An,LiuXuan Luo,YangGe Guo,JieWei Yin,XiaoHui Yan,MiaoMiao He,ShuiYun Shen,JunLiang Zhang
Engineering the surface Pt coordination environment is a promising strategy for promoting the kinetically sluggish oxygen reduction reaction (ORR) on Pt-based catalysts. In this study, we achieve the compressive strain effect and electronic effect by Cu and N co-doping to synthesize the PtCuN hollow nanospheres with PtN overlayers (PtCuN@PtN HNSs) using a facile solvothermal synthesis . Electrochemical investigations show that the constructed disordered Pt–N coordination structures effectively facilitate the ORR and stabilize Pt atoms in the compressed lattice, whereas an excessive N-doping can lead to the formation of a structurally unstable Pt nitride phase. Theoretical analyses confirm that the oxygen reduction kinetics on the compressed PtN overlayers are regulated by a synergistic effect resulting from N-doping and lattice compression, circumventing the traditional linear scaling relationships (LSR). The optimized PtCuN@PtN HNSs, with the composition of PtCu 0.29 N 1.1 , demonstrate an area-specific activity of 1.98 mA cm –2 and a mass-specific activity of 1.81 A mg Pt –1 .
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
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2022
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IF 7.832
Qing Zeng,Danye Liu,Hui Liu,Lin Xu,Penglei Cui,Dong Chen,Jing Wang,Jun Yang
Construction of core-shell nanostructures with ultrathin shells is a powerful way to leverage the lattice strain effect to enhance surface activity for a given catalytic reaction. Herein, we report a gold-catalyzed approach for growing a large variety of subnanometer-thick metal shells of up to several atomic layers on the gold cores. This strategy relies on a gold-catalyzed reduction of various metal precursors, in both aqueous and organic solvents, in which the metal atoms nucleate on the gold seed surfaces instead of self-nucleating in the solution. In addition, by coupling this gold catalysis with the galvanic replacement reaction, the ultrathin shell composition could be tuned to further optimize the lattice strain effect in the shell layer. This provides an effective way to equip the core-shell nanostructures with the desired catalytic performance in some key electrochemical reactions, for example, the ethanol oxidation reaction and oxygen reduction reaction.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
Energy Storage Materials
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2023
·
IF 20.4
Guo Wen Sun,Qian Yu Liu,Chao Yue Zhang,Meng Jing Jin,Jiang Long Pan,Yan Chun Wang,Xiao Yi Hou,Jia Tai Wang,Xiu Ping Gao,Geng Zhi Sun,Xiao Jun Pan,Jin Yuan Zhou
Bimetallic alloy catalysts, due to their more adsorption sites, more abundant electronic structures, and higher catalytic properties than single-metal ones, have attracted much interest in the field of lithium–sulfur batteries (LSBs). However, many LSBs with bimetallic alloys often suffered from their low cycling stability, which was caused by the over-strong adsorption and the bad chemical stability of the catalysts. Herein, in-situ carbon-encapsulation-induced strain relaxation strategy has been adopted to balance the adsorption and catalytic properties of the MoNi 4 bimetallic nanoalloy catalyst for LSBs. As a result, the cathode with strained-MoNi 4 embedded carbon nanofibers (CNF@s-MoNi 4 ) delivers a high capacity (1632.5 mAh g −1 at 0.1 C), a superior rate capability (retaining 832.4 mAh g –1 at 5.0 C) and excellent cycling stability (decaying rate of 0.0204% per cycle over 520 cycles at 1.0 C). Even at high rates, the CNF@s-MoNi 4 can keep a stable cycling capacity (827.5 mAh g –1 and 447.7 mAh g –1 after 250 cycles at 5.0 C and 10.0 C, respectively). Besides, the CNF@s-MoNi 4 LSB also exhibits an excellent wide-temperature-range adaptability (-30 ∼ 50°C) and a superior dynamic bending stability. This study would provide a feasible method for developing high-capacity and long-life LSBs with a wide temperature range demand.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2024
·
IF 5.5
Bo-Qiang Miao,Zi-Han Yuan,Xi-Lai Liu,Xuan Ai,Guang-Tao Zhao,Pei Chen,Pu-Jun Jin,Yu Chen
Comprehensive Summary We present a strategy that effectively modulate the d-band electronic structure of the active center by strain effect and interatomic orbital hybridization. This strategy efficiently promotes the kinetic process of the ethanol oxidation reaction (EOR) in alkaline media. In the intermetallic Pd 3 Pb nanowires, the introduction of Pb not only causes the lattice expansion of Pd but also achieves the interatomic orbital hybridization bonding with Pd. Such interatomic orbital hybridization effect and tensile strain effect can effectively achieve a co-regulation of the d-band electronic structure of Pd, which directly affects the adsorption behavior of intermediate on Pd for EOR. Hence, the intermetallic Pd 3 Pb nanowires demonstrate enhanced EOR activity and anti-poisoning ability against CO ads . Theoretical calculations show that the enhanced OH* adsorption ability and the low energy barrier for the oxidative dehydrogenation of ethanol are the keys to high EOR activity and stability of the intermetallic Pd 3 Pb nanowires.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yingfang Zhu,Sihao Wang,Qingyu Luo,Haifu Huang,Shaolong Tang,Youwei Du
Developing electrocatalysts with high-Pt-utilization efficiency and appropriate surface oxygen affinity through a facile and scalable route is urgently needed for proton exchange membrane fuel cells. Here, SPD-annealing strategy is demonstrated to prepare ordered low-Pt-loading Pd–Pt–Fe nanoalloys with an average particle size of less than 5 nm and excellent electrocatalytic performance. Furthermore, the ORR performances of Pd–Pt–Fe/C nanoalloy catalysts are rationally modified by means of both precise composition control and structural transformation. With an optimal component proportion, the prepared Pd 0 . 75 Pt 0 . 25 Fe/C catalyst exhibits the most excellent intrinsic activity due to the synergistic interaction of lattice strain and ligand effect. Benefiting from the compressive strain effect induced by the relatively tight arrangement of the ordered structure, the adsorption energy of the intermediate oxygen-containing species is effectively weakened, enabling the Pd 0 . 75 Pt 0 . 25 Fe/C to obtain enhanced ORR catalytic performance in acidic condition. Notably, compared with the disordered Pd 0 . 75 Pt 0 . 25 Fe/C, the ordered Pd 0 . 75 Pt 0 . 25 Fe/C shows an extremely superior stability of 98.5% mass activity retention after 10 000 cycles. This work could provide a facile and versatile approach to constructing the ordered low-platinum electrocatalysts with enhanced ORR properties.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Kaili Wang,Mingzhe Wang,Qianzhuo Lei,Tingting Zhou,Xijun Liu,Zhen Cao,Zaiyong Jiang,Jia He
Tuning their strain effect of Pt based alloy electrocatalysts is an efficient strategy to enhance the electrocatalytic performance toward oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFCs). Herein, an efficient PtCu alloy aerogels (PtCu AAs) with adjustable Pt/Cu atomic ratio form a subtle lattice contraction, as well as the electrochemical dealloying process created surface defects with abundant active sites. The prepared Pt 1 Cu 2 AAs catalysts with optimal strain effects and accessible surface sites displayed much-enhanced mass activity and specific activity of 1.65 A/mg Pt and 3.96 mA/cm 2 , which are higher than those of the Pt 1 Cu 1 AAs, Pt 1 Cu 3 AAs and commercial Pt/C catalysts, respectively, originating from the optimal strain effect with the moderate degree of lattice shrinkage. Meanwhile, Pt 1 Cu 2 AAs displayed a remarkable stability. This work offers a new strategy to design an efficient ORR electrocatalyst with surface strain and defects by controlling atomic compositions and electrochemical dealloying process for PEMFCs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2021
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IF 4.724
Xiaobo Yang,Xili Tong,Xingchen Liu,Kaixi Li,Nianjun Yang
The performance of a direct methanol fuel cell (DMFC) is strongly dependent on the catalytic anode. A high-performance anode is expected to offer enhanced intrinsic activity and/or a large electrochemical surface area. Herein, a series of Ag-core/Pd-shell (Ag@Pd x , x = 1,3,5) catalysts are synthesized in which the thickness of the Pd shell is varied. Both tensional strain and electron transfer between the Ag core and the Pd shell are found to affect the intrinsic activity of these Ag@Pd x catalysts. Of these, the Ag@Pd 3 catalyst exhibits the best performance for the methanol oxidation reaction (MOR), showing 4.1 times higher mass activity and 2.6 times higher specific activity than a Pd/C catalyst. Furthermore, density functional theory calculations show that this high MOR performance stems from a stronger adsorption of CH 3 OH and OH on the Pd active sites. This catalyst is thus a promising candidate for inclusion in a high-performance DMFC.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
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