RSC Advances
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2021
·Vol. 11
·期 62
·39467-39475
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IF 3.361
Kai Xie,Ruirui Han,Ping Sun,Hui Wang,Yingsen Fang,Zhicai Zhai,Danzhu Ma,Hui Liu
A series of rice husk biochar (RHBC) modified bimetallic oxides were prepared using a simple pyrolysis method to activate peroxymonosulfate (PMS) for the degradation of acid orange G (OG). The results demonstrated that 50 mg L−1 OG was completely decomposed by 1 mM PMS activated with 100 mg L−1 RHBC–CuCo2O4 within 15 min at initial pH 3.4. The OG degradation rate constant k of RHBC–CuCo2O4/PMS (0.95 × 10−1 min−1) was five times greater than that of CuCo2O4/PMS (0.19 × 10−1 min−1), suggesting that the introduction of RHBC significantly improved the activity of bimetallic oxides. The effects of the initial pH, catalyst dosage, PMS concentration and reaction temperature on OG removal were also studied. The degradation products of OG were analysed using a gas chromatography-mass spectrometer (GC-MS). Electron paramagnetic resonance (EPR) and quenching experiments showed that singlet oxygen (1O2) was the main active species. The RHBC–CuCo2O4/PMS oxidation system is not only unaffected by inorganic anions (Cl−, NO3−, HCO3−) and humic acid (HA), but also could remove other typical pollutants of acetaminophen (ACT), sulfathiazole (STZ), rhodamine B (RhB), and bisphenol A (BPA). These findings show that RHBC–CuCo2O4 has great potential for practical applications in the removal of typical organic pollutants.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yifei Zhang,Zihao Chen,Jin Tian,Mengxiao Sun,Ding Yuan,Lixue Zhang
The elaborative design and construction of first-rank bifunctional oxygen electrocatalysts featuring low price, high activity and strong stability is critical for the large-scale applications of rechargeable Zn-air batteries. Here, a resultful strategy is proposed for fabricating nitrogen-doped 1D beaded-like structure carbon nanofibers uniformly decorated with nitrogen-doped CuCo 2 O 4 nanoparticles (N-CuCo 2 O 4 @CNFs) toward boosting oxygen evolution reaction/oxygen reduction reaction (OER/ORR) catalysis. Taking advantage of the synergistic effect between interconnected 1D hierarchical porous carbon nanofiber structure and high catalytic activity of N-doped CuCo 2 O 4 nanoparticles derived from bimetallic MOFs , the N-CuCo 2 O 4 @CNFs catalysts possess enhanced reaction kinetics and preferable charge transfer ability. Impressively, the obtained catalysts exhibit prominent electrocatalytic ability and superior stability for OER/ORR, even surpass the commercial RuO 2 and Pt/C. More significantly, the Zn-air batteries employing the N-CuCo 2 O 4 @CNFs-800 as cathode display a higher power density of 175.6 mW cm −2 , a lower charge-discharge voltage gap of 0.82 V at 10 mA cm −2 , as well as a better cycling stability with respect to those of Pt/C + RuO 2 mixture, demonstrating the great potential of N-CuCo 2 O 4 @CNF as a high-efficiency catalyst for clean energy devices.
研究领域:
材料科学
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电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2024
·
IF 16.8
Zuming He,Kai Lin,Ngie Hing Wong,Jaka Sunarso,Yongmei Xia,Xiaofei Fu,Bin Tang,Zhengyi Huang,Yong Wang,Hanpei Yang
The pyroelectric effect and electron spin-state reconfiguration play a critical role in photocatalysis but are seldom investigated. This work is the first to exploit the fluctuating temperature (Δ T ) between the cold-hot alternation in photocatalysis to drive the pyroelectric effect and electron spin-sate reconfiguration. FeS 2 /CuCo 2 O 4 (FS/CCO) hollow core-shell heterojunctions were prepared using hydrothermal and heating treatment methods. The FeS 2 (FS) can generate heat under near-infrared (NIR) light to provide the elevated temperature end required for the pyroelectric effect of CuCo 2 O 4 (CCO) under the influence of Δ T . With this thermoelectric and pyroelectric effect, CCO can release surface charges, generating spontaneous polarization, changing the electron (e g ) filling number on Co surface sites, reversing the spin electron state, thus controlling the carriers' migration direction and enhancing their separation and migration rate, and finally prolonging their lifetime. As a result, the as-designed FS/CCO-15 composites yielded up to 19.5 mmol g −1 h −1 extraordinary photocatalytic performance, i.e., 10.2 and 6.45-fold of the pure FS (1.92 mmol g −1 h −1 ) and CCO (3.02 mmol g −1 h −1 ) under simulated sunlight, respectively. It also yielded up to 19.8% average apparent quantum yield. This work thoroughly explored the distinctive impact of the pyroelectric effect, electron spin-state reconfiguration, orbital coupling effect, and hydrogen evolution, guiding us and creating more possibilities for photocatalytic technology and efficiency using NIR light.
研究领域:
材料科学
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光催化技术
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能源转换与存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Changfan Xu,Huanwei Wang,Jing Zhan,Yao Kang,Feng Liang
Designing catalytic cathodes with excellent electrocatalytic activities and durability for Na-CO 2 batteries has captured considerable attention so far. Here, a series of morphologically controlled low-crystalline CuCo 2 O 4 was prepared by thermal oxidation of self-assembled Cu-Co precursors ( p -CCO). One-dimensional (1D) rod-like of CuCo 2 O 4 was subsequently encapsulated in polypyrrole shell (PPy) by in-situ polymerization of pyrrole monomers as an advanced catalyst (CCO/PPy) for high-performance Na-CO 2 batteries . It was demonstrated that ammonia solution exerts an important influence on the surface morphology and size of the p -CCO crystallites by the rate of nucleation and growth. Particle size and 1D architecture modulation, associated with the encapsulation of conductive PPy effectively improve the directional transfer rate of ions and the conductivity of the electrode. More importantly, PPy introduction not only induces interfacial reconstruction of CuCo 2 O 4 , arousing more oxygen vacancies and catalytic active sites, but also contributes to the corrosion protection of the active material from the electrolyte during long-term operation. Bestowed by these advantages, the fabricated hybrid Na-CO 2 battery manifested prominent electrochemical performance with a superior areal discharge capacity of 31.3 mAh cm −2 , low discharge-charge voltage gap of 0.6 V, over 400 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jin Li,Yuan Wang,Xiujing Xing,Yang Wang,Wei Xiong,Hao Li
Electrochemical Nitrate Reduction (NO 3 − RR) is a promising green process for producing ammonia and treating waste water. The nitrate-to-ammonia reduction involves multi-step electron/proton-transfer processes, where the NO 3 − →NO 2 − step may serve as the rate-determining step, posing a critical bottleneck for efficient NH 3 synthesis. In this paper, the emulsion hydrothermal method is used to synthesize spherical and nanoflower-like CuO/CuCo 2 O 4 catalysts with small particle stacking. Among them, CuCo 2 O 4 perfectly inherits the advantages of CuO and Co 3 O 4 , and successfully connects the two-step reactions of NO 3 − →NO 2 − and NO 2 − →NH 3 in series. The CuO formed by excess copper doping is reduced to monomeric copper during electrolysis. Cu is able to synergize with CuCo 2 O 4 to break through the bottleneck of the rate-limiting step of NO 3 − →NO 2 − , exhibiting almost the same ammonia production efficiency in both NO 3 − RR and nitrite reduction reaction (NO 2 − RR). The NH 3 yield of Cu/CuCo 2 O 4 at −0.70 V (vs RHE) reached a maximum of 24.58 mg h −1 mg cat −1 under neutral electrolyte conditions and exhibited 100% Faraday efficiency for NH 3 . Under the same conditions (where the reaction substrate is NO 2 − ), Cu/CuCo 2 O 4 reached an NH 3 yield of 24.34 mg h −1 mg cat −1 in NO 2 − RR.
研究领域:
电化学
·
催化
·
环境工程
·
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）