CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bo Wang,Ziyan Zhao,Zihao Pan,Xuejian Liu,Zhengren Huang,Yan Liu
The ZnO–Al 2 O 3 –B 2 O 3 –SiO 2 (ZABS) glass powder was designed and innovatively employed to join AlN ceramics. The crystallization, thermal expansion and wettability behavior of the ZABS glass and glass-ceramic were investigated. The results shows that Zn 3 B 2 O 6 , ZnSiO 4 and Zn 4 B 6 O 13 were precipitated after heat treatments at different temperature, respectively, resulting in a variation in the coefficient of thermal expansion (CTE) of the ZABS glass ceramic. Then guided by the wetting behavior on the AlN ceramic substrate, the joining of the AlN ceramics by ZABS glass at various temperatures and holding times were conducted. Notably, Zn 3 B 2 O 6 was identified to be the primary product in the joints bonded at temperature of 700–800 °C due to the crystallization within the glass and no discernible reaction was observed between the substrate and the interlayer, while ZnSiO 4 was observed at the periphery of Zn 3 B 2 O 6 after 750 °C. Moreover, the crystalline phase Zn 3 B 2 O 6 gradually grew with the temperature and holding time increasing as the glassy phase gradually diminished, resulting in a reduction of the strength and reliability of the joints. The optimal flexural strength of the joints was 156 ± 11MPa at 700 °C for 30min. The reason for the high strength can be attributed to the interactions between the glass precipitated crystalline phase interlocking each other and the glass phase tightly bonded with the crystalline phase.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zhihui Yao,Daisong Chen,Yuting Li,Qiuqiu Lyu,Juan Wang,Qin Zhong
The rational design and preparation of bifunctional electrocatalysts with pleasant oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance is crucial for extensive commercial applications of rechargeable Zn–air batteries (ZABs). Herein, we report a simple method to obtain multi-metal (Fe, Ni, Zn) embedded in N-doped carbon sheets entangled with carbon nanotubes (CNTs) as superior oxygen electrocatalysts (FeNi-NCS-2). The resultant FeNi-NCS-2 exhibits an impressive electrochemical performance, providing a reversible oxygen overpotential as low as 0.758 V. The ZAB with FeNi-NCS-2 as the air cathode shows a promising capacity of 639.71 mAh g −1 at 20 mA cm −2 , a power density of 109.8 mW cm −2 and cycling stability of over 130 cycles at 10 mA cm −2 with an energy efficiency of about 55%, superior to the ZAB based on Pt/C–IrO 2 . The satisfactory electrocatalytic performance is mainly due to the Fe, Ni-based nanoparticles protected by graphitic carbon layers, hierarchical porous lamellar structures that promote the accessibility between the active centers and the electrolyte as well as self-growing tangled carbon nanotubes that provide fast transmission channels. This study presents a facile way for the synthesis of highly efficient ORR/OER bifunctional electrocatalysts for high-performance rechargeable ZABs.
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 COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shengzhi He,Jingyu Wang,Chunwen Sun
Oxygen reduction reaction (ORR) serves as the foundation for various electrochemical energy storage devices. Fe/N C catalysts are expected to replace commercial Pt/C as oxygen electrode catalysts based on the structural tunability at the atomic level, abundant iron ore reserves and excellent activity. Nevertheless, the lack of durability and low active site density impede its advancement. In this work, a durable catalyst, Cu Fe/N C, for ORR was prepared by modulating the interfacial composition and electronic structure. The introduction of Cu nanoclusters partially eliminates the Fenton effect from Fe and optimizes the electron structure of Fe N x , thereby effectively enhancing the long-term durability and activity. The prepared Cu Fe/N C exhibits a half-wave potential ( E 1/2 ) of 0.90 V and superior stability with a decrease in E 1/2 of only 20 mV after 10,000 cycles. The assembled alkaline Zinc-Air batteries (ZABs) with Cu Fe/N C exhibit an open-circuit potential of 1.458 V. At a current density of 5 mA cm −2 , the batteries are capable of operation for 600 h with a stable polarization. This Cu Fe/N C may promote the practical application of novel and renewable electrochemical energy storage devices.
研究领域:
电化学
·
催化
·
能量存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Weiguang Fang,Peng Dai,Haibo Hu,Tongtong Jiang,Huaze Dong,Mingzai Wu
Simultaneous acquisition of satisfactory bifunctional activities toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for single transition metal sulfides is challenging, which greatly restrict their applications as cathode catalysts in the rechargeable Zn-air batteries (ZABs). Herein, Fe 0.96 S/Co 8 FeS 8 nanoparticles co-embedded in 3D porous N, S codoped carbon (Fe 1 Co 1 S x @NSPC) were fabricated with regulated ratio of iron to cobalt. Compared with single iron sulfide catalyst (Fe 0.96 S@NSPC), the obtained Fe 1 Co 1 S x @NSPC exhibits enhanced activities in both ORR and OER , whose half-wave potential and overpotential (at 10 mA cm −2 ) are 0.82 V, 0.39 V. The improved electrocatalytic activities are believed to be from the synergistic effects between the binary sulfides and the N, S co-doping and the 3D porous structures. As expected, the home-made aqueous ZAB based on Fe 1 Co 1 S x @NSPC exhibits a high peak power density (159 mW cm −2 ), large specific capacity (807 mAh g −1 ) and a long-term charge/discharge cycling stability over 378 cycles at about 852 mV. Moreover, the self-made all-solid-state button ZAB based on Fe 1 Co 1 S x @NSPC shows a high peak power density (71 mW cm −2 ) and a well maintained cycle life at about 841 mV over 100 charge/discharge cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Guanhua Zhang,Mingwang Lu,Qitong Sheng,Guangjian Xing,Xiaojing Yang,Xiaofei Yu,Xinghua Zhang,Zunming Lu,Lanlan Li
The development of highly efficient and stable bifunctional electrocatalysts capable of simultaneously catalyzing the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is critical for advancing zinc-air batteries (ZABs). However, the linear scaling relationship (LSR) governing the adsorption energies of oxygen species imposes constraints on the concurrent enhancement of ORR and OER performance. In this study, we report the synthesis of a novel FeSn/NC catalyst that exhibits strong p-d orbital hybridization by incorporating p-block Sn metal into d-block Fe metal. This strategy facilitates the manipulation of the d-band center and enables the effective formation of low-spin (LS) Fe 3+ simultaneously. The regulation of the d-band center is identified as an effective strategy to enhance the adsorption energy of OOH* and OH* intermediates, while the LS Fe 3+ configuration can effectively weaken the adsorption strength of the O* intermediate. Consequently, this p-d hybridized Fe-based catalyst successfully overcomes the constraints imposed by LSR, thereby boosting bifunctional activity for both ORR and OER. The synthesized FeSn/NC catalyst demonstrates exceptional bifunctional performance with a potential difference (ΔE) of 0.65 V between ORR and OER activities. Furthermore, ZAB based on FeSn/NC achieves an impressive peak power density of 186.0 mW cm −2 , while maintaining stable operation over 700 h during cycling tests. This work offers new insights into designing high-performance bifunctional electrocatalysts through strategies involving synergistic modulation of d-band center and spin state.
研究领域:
电化学
·
材料科学
·
催化
·
能量存储与转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yueming Yan,Qian Zhu,Lei Cao,Feng Gu,Shiji Liu,Yuhao Luo,Feng Liu,Shufen Wang,Lanlan Fan,Shixian Xiong
Rational construction of efficient carbon-supported rare earth cerium nanoclusters as oxygen reduction reaction (ORR) is of great significance to promote the practical application of zinc-air batteries (ZABs). Herein, N doped conductive carbon black anchored CeO 2 nanoclusters (CeO 2 Clusters/NC) for the ORR is reported. The volatile cerium species vaporized by CeO 2 nanoclusters at high temperatures are captured by nitrogen-rich carbon carriers to form highly dispersed Ce-N x active sites. Benefiting from the coupling effect between oxygen vacancies-enriched CeO 2 nanoclusters and highly dispersed Ce-N x sites, the prepared 2CeO 2 Clusters/NC catalyst possesses an ORR half-wave potential of 0.88 V, superior electrochemical stability, and better methanol tolerance compared to commercial Pt/C catalysts. Moreover, the 2CeO 2 Clusters/NC involved liquid ZABs show excellent energy efficiency, superior stability, and a high energy density of 982 Wh kg −1 at 10 mA cm −2 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 34
·2202725
·
IF 15.153
Pengxiang Zhang,Yanyan Liu,Songlin Wang,Limin Zhou,Tao Liu,Kang Sun,Huaqiang Cao,Jianchun Jiang,Xianli Wu,Baojun Li
Oxygen reduction reaction (ORR) is the key reaction on cathode of rechargeable zinc–air batteries (ZABs). However, the lack of protons in alkaline conditions limits the rate of ORR. Herein, an activating water strategy is proposed to promote oxygen electrocatalytic activity by enhancing the proton production from water dissociation. FeP nanoparticles (NPs) are coupled on N-doped wood-derived catalytically active carbon (FeP-NWCC) to associate bifunctional active sites. In alkaline, FeP-NWCC possesses outstanding catalytic activities toward ORR ( E 1/2 = 0.86 V) and Oxygen evolution reaction (OER) (overpotential is 310 mV at 10 mA cm −2 ). The liquid ZABs assembled by FeP-NWCC deliver superior peak power density (144 mW cm −2 ) and cycle stability (over 450 h). The quasi-solid-state ZABs based on FeP-NWCC also display excellent performances. Theoretical calculation illustrates that the superb bifunctional performance of FeP-NWCC results from the elevated dissociation efficiency of water via FeP NPs to assist the oxygen catalytic process. The strategy of activating water provides a new perspective for the design of ORR/OER bifunctional catalysts. This work is a model for the application of forest biomass.
研究领域:
材料科学
·
电化学
·
能量存储
·
催化
·
可持续材料
✓ 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）