ACS Applied Materials & Interfaces
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2023
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IF 9.5
Yuan-li Wang,Tong-hui Yang,Song Yue,Hang-bo Zheng,Xiao-pan Liu,Peng-zhao Gao,Hang Qin,Han-ning Xiao
Composition optimization, structural design, and introduction of external magnetic fields into the catalytic process can remarkably improve the oxygen evolution reaction (OER) performance of a catalyst. NiFe2O4@(Ni, Fe)S/P materials with a heterogeneous core–shell structure were prepared by the sulfide/phosphorus method based on spinel-structured NiFe2O4 nanomicrospheres. After the sulfide/phosphorus treatment, not only the intrinsic activity of the material and the active surface area were increased but also the charge transfer resistance was reduced due to the internal electric field. The overpotential of NiFe2O4@(Ni, Fe)P at 10 mA cm–2 (iR correction), Tafel slope, and charge transfer resistance were 261 mV, 42 mV dec–1, and 3.163 Ω, respectively. With an alternating magnetic field, the overpotential of NiFe2O4@(Ni, Fe)P at 10 mA cm–2 (without iR correction) declined by 45.5% from 323 mV (0 mT) to 176 mV (4.320 mT). Such enhancement of performance is primarily accounted for the enrichment of the reactive ion OH– on the electrode surface induced by the inductive electric potential derived from the Faraday induction effect of the AMF. This condition increased the electrode potential and thus the charge transfer rate on the one hand and weakened the diffusion of the active substance from the electrolyte to the electrode surface on the other hand. The OER process was dominantly controlled by the charge transfer process under low current conditions. A fast charge transfer rate boosted the OER performance of the catalyst. At high currents, diffusion exerted a significant effect on the OER process and low OH– diffusion rates would lead to a decrease in the OER performance of the catalyst.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 29
·10203-10211
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IF 4.174
Shaobin Li,Jing Pan,Fengbo Li,Li Zhang,Dongfeng Chai,Zhuanfang Zhang,Jianjiao Xin
A simple continuous hydrothermal method was used to synthesize a NiFe2O4@Ni–Mn LDH/NF composite. The layered structure provides a large void to transfer the electron effectively, and the composite materials exhibit remarkable electrochemical performance including excellent specific capacitance (1265 F g−1 at 1 A g−1) and remarkable cycling stability (the specific capacitance remains at 80.9% after 5000 cycles). In addition, the asymmetric supercapacitor exhibits a high energy density of 96.2 W h kg−1 at a power density of 700 W kg−1, and there is an extraordinarily good cycling stability with a capacity retention rate of 92.5% after 4000 cycles. The outcomes indicate that the NiFe2O4@Ni–Mn LDH/NF composite electrode has potential application as a high-performance supercapacitor.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
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IF 13
Hongbo Zhang,Yiting Zhao,Zhenfeng Cheng,Jingyun Jiang,Jianwei Fu,Qun Xu
To meet the industrial demand for overall water splitting, oxygen evolution reaction (OER) electrocatalysts with low-cost, highly effective, and durable properties are urgently required. Herein, a facile confined strategy is utilized to construct 2D NiFe 2 O 4 /Ni(OH) 2 heterostructures-based self-supporting electrode with surface-interfacial coengineering, in which abundant and ultrastable interfaces are developed. Under the high molar ratio of Ni/Fe, both spinel oxide and hydroxides phases are formed simultaneously to obtain 2D NiFe 2 O 4 /Ni(OH) 2 heterostructure. The in-depth analysis indicates that the NiFe 2 O 4 /Ni(OH) 2 interface displays strong electronic interactions and triggers the formation of crystalline-amorphous coexisting catalytic active NiOOH. Meanwhile, the stable catalyst-collector interface favors the electron transfer and oxygen molecules transport. The resultant 2D NiFe 2 O 4 /Ni(OH) 2 @CP electrode exhibits superior OER performance, including a low overpotential of 389 mV and a long operating time of 12 h at 1 A cm −2 . This work paves a novel method for fabricating efficient and low-cost electrocatalysts for electrochemical conversation devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Shihu Cao,Shugang Zheng,Tianci Liu,Jinhao Liu,Yaqi Yin,Dan Feng,Yunqing Liu,Dayi Qian,Jiangwei Shang,Xiuwen Cheng
Herein, we identified interfacial oxygen vacancy-metal (O V -Ni) dual-sites within a NiFe 2 O 4 /Ni@NC composite as the definitive structural origin for dictating the selective evolution of singlet oxygen ( 1 O 2 ) from peroxymonosulfate (PMS) activation. The catalyst was fabricated via in-situ pyrolysis of a Ni-MOF on NiFe 2 O 4 nanoparticles, and its mechanism was elucidated through a combination of in-situ spectroscopy, kinetic analysis, and density functional theory (DFT) calculations. This 1 O 2 -driven catalysis achieved an 11-fold enhancement in the levofloxacin degradation rate, with the interfacial synergy lowering the non-radical pathway’s energy barrier by 0.037 eV. We conclude that these engineered dual-sites deterministically control reaction selectivity, as proven by the first experimental trapping of a surface-bound 1 O 2 precursor. This work establishes a design blueprint for advanced non-radical catalysts by transforming the approach from serendipitous discovery to predictable, interface-driven design.
研究领域:
环境催化
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材料化学
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物理化学
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纳米催化
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水处理技术
✓ 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）