JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Fang Liu,Dazhi Gao,Fangqing Wang,Pengcheng Shen,Yang Liu,Shiqing Zhang,Ying Li,Jun Zhang,Yanming Xue,Chengchun Tang
The electrocatalytic oxygen reduction reaction (ORR) is crucial for energy conversion systems such as fuel cells and metal-air batteries . Boron carbon nitrogen (BCN) is a novel functional material with a high specific surface area , excellent corrosion resistance , and outstanding electrochemical stability. These properties make BCN an effective ORR catalyst and a promising support for metal catalysts . This study leveraged the strong interaction between BCN and metals to anchor platinum nanoparticles (Pt NPs) onto the BCN surface (Pt/BCN), significantly enhancing the durability of traditional Pt/C catalysts in ORR. The half-wave potential of Pt/BCN is 0.927 V, higher than Pt/XC-72R (0.857 V) and commercial Pt/C (0.879 V). Notably, after 10,000 durability test cycles, the mass activity (MA) of Pt/XC-72R and commercial Pt/C decreased by 67 % and 75 %, respectively. Even after 50,000 cycles, Pt/BCN exhibited only a 54 % decrease in MA. Experimental data and density functional theory calculations confirmed increased electron transfer from Pt to the BCN support, indicating a strong electronic metal-support interaction (EMSI) between Pt and BCN. This strong EMSI effectively anchored the Pt NPs, preventing migration and aggregation during the ORR process. Consequently, our research introduces a novel electrocatalyst support material with significant potential for ORR and broader applications.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 47
·33301-33313
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IF 10.7
Yantong Long,Guoliang Zhao,Liuxin Yang,Yongjun Xu,Chen Xu
Efficient bifunctional catalysts for hydrogen/oxygen evolution reactions (HER/OER) are critical for industrial application of overall water splitting. Herein, a self-supported nanostructure consisting of CoNi–P and embedded carbon dots (denoted as CoNi–P/CDs/NF) with large specific surface area has been designed and fabricated, through a phosphorization process on precursors grown on 3D porous Ni foam. The resultant electrocatalyst exhibited excellent electrocatalytic performance for both the HER (45.2 mV@10 mA cm−2) and OER (184.8 mV@20 mA cm−2) under alkaline conditions. The cell voltage of the full water splitting device assembled was only 1.50 V to achieve 20 mA cm−2 and exhibited great durability benefiting from the self-supported nanostructure. The density functional theory (DFT) calculations and XPS analysis suggest that the synergistic coupling effect between CDs and substrate CoNi–P could tune the electronic structure. Moreover, the embedded CDs increase electrical conductivity and active sites of the catalyst. Both of these and the high specific surface benefited from the 1D/3D hierarchical structure could explain the excellent electrocatalytic performance. The rational materials design of 1D/3D hierarchical structured non-noble bimetallic phosphide catalysts in this work may suggest a new strategy for designing bifunctional electrocatalysts.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
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IF 4.1
Zeyu Jin,Yuelin Wang,Linshan Zhu,Jingzi Zhang,Xi Lin
Oxygen evolution reaction (OER) plays an important role in the energy conversion industry. Despite the prevalent reliance on noble metals for their superior catalytic attributes, their high cost and limited availability present significant challenges. Reducing the use of noble metals in catalysts while maintaining catalytic activity and stability in various chemical environments is a major challenge in heterogeneous catalysis. In this study, we have strategically enhanced the catalytic performance of the Cr 2 O 3 oxide by introducing multiple transition metal dopants to modulate its electronic structure. It is found that doping Ni/Co/Cu/Ru into the Cr 2 O 3 oxide results in the best OER performance, which outperforms RuO 2 and other reported materials. We further improved the cycling stability of the multi-component catalyst by coating amorphous carbon on its surface. Specifically, with an OER overpotential of merely 210 mV at 10 mA cm −2 and a low Tafel slope of 59.5 mV dec −1 , the catalyst exhibits remarkable catalytic efficiency. More importantly, it can withstand high current tests exceeding 100 mA cm −2 for over 80 h without significant degradation of its OER catalytic performance. In addition, the catalyst exhibits exceptional hydrogen evolution reaction (HER) performance which is close to Pt/C, making it suitable for use as a bifunctional water splitting device. These findings have opened up a new field for the design and application of multi-component catalysts.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
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2024
·
IF 2.4
Yang Xiaobo,Wang Chao,Zhou Bao,Duan Zhuoqi,Xie Zaixin,Nie Heng-Yong,Hu Yongmao
Boron and nitrogen dual-doped carbon fibers loaded with nanocrystalline NiCo were derived from carbonization of layers deposited by electrospinning a solution containing precursor reagents of nickel acetate, cobalt acetate, 4-hydroxybenzeneboronic acid, and polyacrylonitrile. This composite with uniformly distributed boron and nitrogen atoms in and NiCo nanoparticles around the carbon skeleton, denoted as NiCo@BNCF-T, where T represented the carbonization temperature in Celsius, possessed a considerable specific surface area. It was demonstrated that the NiCo@BNCF-T electrode, as an electrocatalyst, offered excellent electrocatalytic performance toward oxygen evolution reaction in alkaline environment. For example, the overpotential at 10 mA cm −2 of the NiCo@BNCF-900 electrode was 268 mV, which was 43 mV lower than that of the RuO 2 electrode. In addition, the NiCo@BNCF-900 electrode exhibited excellent durability of 90% retention after 60-h polarization at 1.60 V. The two-electrode system for electrolytic water splitting, composed of the NiCo@BNCF-900 as the anode and the commercial Pt/C as the cathode, showed a voltage of 1.49 V to afford 10 mA cm −2 for overall water splitting, which was superior to that of the RuO 2 ||Pt/C counterpart, which was a complete commercial system using noble metals. This work developed an effective electrocatalyst with non-noble metals (nickel and cobalt) and non-metal elements (boron, carbon and nitrogen), which was demonstrated to be a high-performance catalyst for oxygen evolution reaction. Graphical abstract
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PHARMAZIE
·
2012
·Vol. 67
·期 5
·426-431
·
IF 1.006
Sun Xiaoyi,Chen Jinliang,Chen Hailiang,Liang Wenquan
The transfection agent polycation polyethylenimine (PEI) has been rarely used to construct liposomes for chemical antitumor drugs. In this study, it was introduced into cisplatin (CDDP) encapsulated neutral liposomes (CDDP-NL) by amphiphilic PEI-cholesterol (PEI-Chol) to investigate
its effect on the antitumor activity in A549 cells. The IC50 was 0.65 ± 0.02, 2.94 ± 0.21 and 2.03 ± 0.15 g/ml for CDDP-cationic liposomes (CDDP-CL), CDDP-NL and free CDDP, respectively. The enhanced anticancer activity was attributed to the addition of PEI-Chol
which influenced cellular processing of CDDP. With the help of inhibitors, we found that besides clathrin dependent and actin dependent uptake pathways, caveolae-mediated endocytosis was involved in the internalization of CDDP-CL. Improved internalization of CDDP was observed. Intracellular
Pt accumulations were 6.5 times and 3 times of those in CDDP-NL and free CDDP groups, respectively. The differences of intracellular location caused by endocytosis routes and lysosomes escape capacity of PEI-Chol was observed by fluorescence colocalization studies. PEI-Chol also decreased
the Pt fraction exported out of cells and extended the cellular Pt retention of CDDP liposomes. In conclusion, cationic modification of liposomes with PEI is a potential and promising way for antitumor drug delivery.
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Journal of Energy Storage
·
2024
·
IF 8.9
Heju Gao,Qihao Wu,Jiahui Jiang,Ting Zhao,Yuying Feng,Chunyan Wu,Guancheng Xu,Li Zhang
Reasonable construction of efficient bifunctional catalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) counts a great deal for the development and application of rechargeable zinc-air batteries. Herein, we prepared nano-sized heterostructural particles of cobalt phosphides (CoP/Co 2 P) confined in N, P-codoped cubic through simple grinding combined with vapor deposition method using the Co formic-acid framework (Co-FF) as the precursor. Benefit from the synergistic effect between the coexistence of abundant active sites including Co sites derived the CoP/Co 2 P nanoparticles, graphitic-N, pyridinic-N species and regulation of heterojunction interface electrons, the CoP/Co 2 P@NPC-800 catalyst exhibited excellent bifunctional catalytic activity toward ORR and OER, slightly better than commercial 20 % Pt/C. The liquid zinc-air battery demonstrates a specific capacity of 720.1 mAh g −1 and outstanding stability exceeds 250 h, comparable to 20 % Pt/C. Moreover, the flexible zinc-air battery can maintain good stability under different angles of bending. This study has a certain theoretical guiding significance for the rational regulation of the phase of cobalt-based phosphide to fabricate bifunctional oxygen catalysts for metal-air battery applications.
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International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 32
·期 2
·476-487
·
IF 5.6
Chen Junkang,Zhuang Yongyue,Qiao Yanxin,Zhang Yu,Yuan Aihua,Zhou Hu
Exploring efficient and nonprecious metal electrocatalysts of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for developing rechargeable zinc-air batteries (ZABs). Herein, an alloying-degree control strategy was employed to fabricate nitrogen-doped carbon sphere (NCS) decorated with dual-phase Co/Co 7 Fe 3 heterojunctions (CoFe@NCS). The phase composition of materials has been adjusted by controlling the alloying degree. The optimal CoFe 0.08 @NCS electrocatalyst displays a half-wave potential of 0.80 V for ORR and an overpotential of 283 mV at 10 mA·cm −2 for OER in an alkaline electrolyte. The intriguing bifunctional electrocatalytic activity and durability is attributed to the hierarchically porous structure and interfacial electron coupling of highly-active Co 7 Fe 3 alloy and metallic Co species. When the CoFe 0.08 @NCS material is used as air-cathode catalyst of rechargeable liquid-state zinc-air battery (ZAB), the device shows a high peak power-density (157 mW·cm −2 ) and maintains a stable voltage gap over 150 h, outperforming those of the benchmark (Pt/C+RuO 2 )-based device. In particular, the as-fabricated solid-state flexible ZAB delivers a reliable compatibility under different bending conditions. Our work provides a promising strategy to develop metal/alloy-based electrocatalysts for the application in renewable energy conversion technologies.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 6
·1852-1861
·
IF 6.1
Qihao Wu,Tao Xie,Li Zhang,Heju Gao,Jiahui Jiang,Ting Zhao,Guancheng Xu
Wearable and rechargeable zinc–air batteries (ZABs) hold significant potential for applications in flexible electronics and light weight power sources due to their high energy density and excellent safety. However, the practical use of ZABs is hindered by the slow kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on the air cathode. Here, we prepared S, N co-doped carbon nanotubes loaded with a cobalt–iron alloy (CoFe and Co0.72Fe0.28) and Co8FeS8 nanoparticles that can act as bifunctional electrocatalysts through one-step pyrolysis using the CoFe formic-acid framework (CoFe-FF) as the metal source. This electrocatalyst exhibited a superior electrocatalytic performance compared to commercial Pt/C (20 wt%) and RuO2. The ZAB assembled with CoFeS/SNCNT demonstrated an open-circuit voltage (OCV) of 1.47 V, a maximum power density (Pmax) of 175.3 mW cm−2, and a good cycle life. Furthermore, the flexible ZAB assembled with CoFeS/SNCNT achieved an OCV of 1.38 V and a Pmax of 77.7 mW cm−2, while maintaining stability under different bending angles. This study presents a feasible strategy for synthesizing and constructing high-performance non-noble metal bi-functional electrocatalysts for rechargeable zinc–air batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ruihong Guo,Yujuan Zhang,Xiutang Zhang,Hong Yang,Tuoping Hu
The use of the hydrazine oxidation reaction (HzOR) to replace the oxygen evolution reaction (OER), which has a large thermodynamic barrier and a slow kinetic process, is a feasible way to achieve energy saving hydrogen production, but the construction of superior bifunctional catalysts is also challenging. Herein, an array (CoFe 2 O 4 @NNWs) of CoFe 2 O 4 nanosheet grown in situ on nickel nanowires (NNWs) has been prepared and showed the excellent performance for hydrogen evolution reaction (HER) and HzOR under alkaline media, which require a lower potential of −91 mV (vs. RHE) for HzOR and 45 mV (vs. RHE) for HER at the current density (j, 10 mA cm −2 ). The overall hydrazine splitting (OHzS) electrolyzer requires cell voltages of 0.028 V (10 mA cm −2 ) and 1.227 V (1000 mA cm −2 ) by using electricity, wind, solar and thermal energies as power sources and had remarkable long-term stability. In addition, the potential of the OHzS is 1.67 V lower than that of OWS at the j of 10 mA cm −2 . The excellent performance of CoFe 2 O 4 @NNWs is attributed to the fact that the heterojunction fromed by CoFe 2 O 4 and NNWs effectively regulates the electron density of the sample, thereby improving the kinetics of H* adsorption and the N 2 H 4 dehydrogenation, which can be confirmed by DFT. Second, the continuous electron transport channel provided by NNWs improves the electrical conductivity of the sample. In addition, the 2D CoFe 2 O 4 nanosheets grown on NNWs not only expose more catalytic active sites, but also provide a fast channel for the diffusion of the electrolyte.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jiayun Song,Zixiao Li,Shengjun Sun,Chaoxin Yang,Zhengwei Cai,Xiaoyan Wang,Meng Yue,Min Zhang,Hefeng Wang,Asmaa Farouk,Mohamed S. Hamdy,Xuping Sun,Bo Tang
Seawater electrolysis taking advantage of coastal/offshore areas is acknowledged as a potential way of large-scale producing H 2 to substitute traditional technology. However, anodic catalysts with high overpotentials and limited lifespans (caused by chloride-induced competitive chemical reactions) hinder the system of seawater electrolysis for H 2 production. Herein, we present a citrate anion (CA) modified NiFe layered double hydroxide nanosheet array on nickel foam (NiFe LDH@NiFe-CA/NF), which serves as an efficient and stable electrocatalyst towards long-term alkaline seawater oxidation. It requires only a low overpotential of 387 mV to achieve a current density of 1000 mA cm −2 , outperforming NiFe LDH/NF (414 mV). Moreover, NiFe LDH@NiFe-CA/NF exhibits continuous oxygen evolution testing for 300 h at 1000 mA cm −2 due to its anti-corrosion characterization. Additionally, the fabricated cell can stably operate at 300 mA cm −2 (60 °C, 6 M KOH + seawater) and only require 1.69 V, achieving low energy consumption of seawater splitting.
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AICHE JOURNAL
·
2024
·
IF 3.5
Shuhuan Han,Zhengxuan Shao,Xiuhui Li,Jiwen Fu,Xiaofei Zeng
MoS 2 has been considered as a potential replacement for Pt-based catalysts in hydrogen evolution reaction. But the lack of sufficient active sites limits the intrinsic activity of MoS 2 -based catalysts. Here, we propose a general strategy to synthesize ultra-small MoS 2 nanosheets grown evenly on carbon substrates to maximize the active sites by exposing more edge positions and inducing MoS 2 phase transition. It is found that Ru can assist MoS 2 to grow vertically and uniformly on the surface of carbon substrates by in situ derivatization to improve the catalytic activity effectively. MoS 2 nanosheets on the substrates are much smaller and denser than those prepared without Ru or with other metal elements. Electrocatalysis results revealed that the number of active sites and conductivity of the optimized Ru-MoS 2 @CSs increase obviously, and the overpotential at 10 mA cm −2 is much lower than that of MoS 2 @CSs and metal (Co, Ni)-MoS 2 @CSs, respectively, at 1.0 M KOH.
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GREEN CHEMISTRY
·
2024
·
IF 9.3
Kaihua Liu,Xinzeng Zhang,Jing Li,Yuanyuan Liu,Meiri Wang,Hongtao Cui
Seawater electrolysis provides a desirable pathway for large-scale production of green hydrogen without dependence on freshwater. However, its practical application is seriously hindered by low energy efficiency and insufficient durability because of the detrimental chlorine electro-oxidation and complex components of seawater. Herein, 2D MoN/Co2N hybrid nanosheets grown on 1D Cu nanowires and integrated on 3D Cu foam electrodes (Co/Mo–N–C/Cu) were fabricated for seawater splitting, which could enable the alkaline seawater electrolyzer assembled with these hierarchically structural electrodes to achieve a current density of 100 mA cm−2 at a low voltage of 1.70 V, along with good stability due to the synergistic effect among the MoN/Co2N hybrid nanosheets, unique 1D/2D/3D hierarchical structure, and the N-doped carbon protection layer. Theoretical calculations demonstrated that strong electron transfer occurred at heterogeneous interfaces, which could mediate the adsorption and desorption of intermediates, thus reducing the reaction energy barriers.
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