Materials Today Energy
·
2022
·
IF 9.257
Kaiyue Chen,Xingkun Wang,Canhui Zhang,Ren Xu,Huanlei Wang,Lei Chu,Minghua Huang
Breakthroughs in the design of robust bifunctional oxygen reduction/evolution reaction (ORR/OER) catalysts could put Zn–air batteries performance to the summit but remain full of challenges. In this work, the MnS phase was deliberately introduced into the Mott–Schottky Co/Co 9 S 8 for engineering a three-phases Co/Co 9 S 8 /MnS heterojunction on defect-rich N-doped mesoporous carbon substrate (Co/Co 9 S 8 /MnS-NMC). It affords abundant three-phases heterostructure interfaces that effectively accelerate the electron transfer and trigger further electronic structure reconfiguration, thus advancing the bifunctional ORR/OER activities. Benefiting from these structures, the Co/Co 9 S 8 /MnS-NMC possesses a half-wave potential of 0.84 V toward ORR and a low overpotential of 330 mV toward OER at a current density of 10 mA/cm 2 , catching up with those of commercial Pt/C and RuO 2 catalysts. It also endows the Zn–air batteries with a good power density, round-trip efficiency, and robust stability over 750 h, showcasing the promising potential in practical applications. This work not only provides a facile strategy to construct the three-phases heterojunction catalysts but also sheds light on developing the efficient and robust nonprecious metal-based bifunctional ORR/OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 62
·50024-50032
·
IF 3.84
Jiyong Fang,Zheng Chen,Wei Wei,Yunxi Li,Tao Liu,Zhi Liu,Xigui Yue,Zhenhua Jiang
A three-phase heterostructure composite CF/Co0.2Fe2.8O4/PANI with a layer by layer (LBL) structure was designed and synthesized for achieving improvement in electromagnetic (EM) wave attenuation of carbon fiber (CF). The structure and morphology analyses demonstrated the LBL structure of the absorber. The electromagnetic parameters of the absorber and wax composite were measured at 2–18 GHz to evaluate its EM wave attenuation performance. The three-phase heterostructures absorber CF/Co0.2Fe2.8O4/PANI demonstrated the highest attenuation effectiveness value of −38.2 dB (>99.9% attenuation) at 12.7 GHz with a thickness of 4.1 mm. Moreover, for CF/Co0.2Fe2.8O4/PANI, with an absorber thickness of 3.1–4.1 mm, the minimum RL values are all lower than −20 dB in Ku band. The excellent EM wave absorbency in the Ku band for CF/Co0.2Fe2.8O4/PANI results from the combined effect of magnetic loss and dielectric loss by introducing more phase onto CF. Considering the EM wave absorption performance and the effortless fabrication process, it is believable that by introducing more specially designed phases, the EM wave attenuation performance of CF can be significantly improved.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Longqian Wang,Pan Wang,Xin Xue,Dan Wang,Huishan Shang,Yafei Zhao,Bing Zhang
Rational designing efficient transition metal-based multifunctional electrocatalysts is highly desirable for improving the efficiency of hydrogen production from water cracking. Herein, a self-supported three-phase heterostructure electrocatalyst of nickel–cobalt sulfide/nickel phosphide/iron phosphide (CoNi 5 S 8 -Ni 2 P-FeP 2 ) was prepared by a two-step gas-phase sulfurization/phosphorization strategy. The heterostructure in CoNi 5 S 8 -Ni 2 P-FeP 2 provides a favorable interfacial environment for electron transfer and synergistic interaction of multiphase active components, while the introduced electronegative P/S not only serves as a carrier for proton capture in the hydrogen evolution reaction (HER) process but also promotes the metal-electron outflow, which in turn accelerates the generation of high-valent Ni 3+ species to enhance the catalytic activity of oxygen evolution reaction (OER) and urea oxidation reaction (UOR). As expected, CoNi 5 S 8 -Ni 2 P-FeP 2 reveals excellent multifunctional electrocatalytic properties. An overpotential of 35/215 mV is required to reach 10 mA cm −2 for HER/OER. More encouragingly, a current of 100 mA cm −2 requires only 1.36 V for UOR with CoNi 5 S 8 -Ni 2 P-FeP 2 as anode, which is much lower as compared to the OER (1.50 V). Besides, a two-electrode water/urea electrolyzer assembled based on CoNi 5 S 8 -Ni 2 P-FeP 2 has a voltage of only 1.59/1.48 V when the system reaches 50 mA cm −2 . This work provides a new idea for the design of energy-efficient water/urea-assisted water-splitting multifunctional catalysts with multi-component heterostructure synergistic interface engineering.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zihan Huang,Zhixuan Zhang,Yifeng Han,Liya Rong,Hongling Yao,Changwen Li,Xianbao Wang,Tao Mei
The practical application of high-performance lithium‑sulfur batteries (LSB) was primarily hindered by polysulfides shuttling and sluggish sulfur redox kinetics. To overcome these limitations, this study introduces a multifunctional three-phase heterostructured TiO 2 /ZnS@MXene catalyst engineered to synergistically combine high adsorption capacity and strong catalytic activity. The TiO 2 component, known for its' strong chemical affinity and ZnS, serving as an efficient electrocatalyst, were homogeneously anchored onto the highly conductive MXene substrate via in situ growth. Additionally, the MXene hollow microsphere structure effectively inhibited the self-stacking of lamellar host to ensure the maximum exposure of the active sites, providing a favorable buffer space for the volume expansion throughout the reaction process. The elaborately integrated TiO 2 /ZnS@MXene heterostructure provides a synergistic effect to realize the function of sequential capture-diffusion-transformation of sulfur species throughout the reaction process. As a result, the LSB containing TiO 2 /ZnS@MXene heterostructures could retain 821.7 mAh g −1 after 1000 cycles at 1C with only 0.010 % capacity decay per cycle. Even with a sulfur content of 5.8 mg cm −2 and lean electrolyte conditions (5.1 μL mg −1 ), it still delivers an area capacity of 4.1 mAh cm −2 at 0.2C.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
催化化学
✓ 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）