Small
·
2024
·
IF 13
Hongliang Fu,Yue Lian,Yongfeng Hu,Jing Zhao,Huaihao Zhang
The development of highly stable and strongly active electrode materials for sodium-ion batteries (SIBs) and overall water splitting (OWS) is critical in sustainable energy storage and conversion systems. Here, a new electrode material N-Fe-C@Nb 2 CT x is introduced, with a layered sandwich structure consisting of N-doping Fe-MOF derived-nanorods (Fe-C) and Nb 2 CT x MXenes. Specifically, Nb 2 CT x obtained by etching Nb 2 AlC with HF acid is used as the main body to construct the layered sandwich structure with Fe-C as the filler. Benefiting from this structure, Fe-MOF grows in situ within Nb 2 CT x , which restrains MXenes aggregation and stacking and also alleviates the bulk effect of sodium-ion embedding/de-embedding, thus improving its stability. Again, the more exposed active sites from the layered sandwich structure and N-doping introduction ensure high reactivity as electrode materials. In addition, Fe-C nanorods strengthen the linkage between the Nb 2 CT x layers and N-doping enhances the ion/electron transport rate, thereby boosting the effective mass transfer and electrical conductivity. Density functional theory (DFT) calculations show that Fe-C and N-doping help increase the density of states (DOS) and material electrical conductivity. Meanwhile, the generated oxygen species (*OH and *O) in OER are captured by in situ FT-IR test. As a result, the N-Fe-C@Nb 2 CT x electrochemical test displays good electrochemical performance in SIBs and OWS.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shuai Li,Yimei Zhang
Enhancing the energy efficiency of hydrogen evolution reaction (HER) represents a significant yet challenging goal. One promising approach to achieve this is developing catalysts with high activity and robust stability to couple HER with Fenton reaction. Herein, mesoporous nanosheet arrays (MNA) with featuring a mean pore size of 25 nm, was fabricated via a hydroxide precursor annealing strategy. The produced Co-P MNA 25 and Fe-Co-P MNA 25 are applied in HER and Fenton reaction, respectively. Compared to the MNA 12 synthesized by traditional method of self-growth and solid-phase phosphorization, the MNA 25 exhibited remarkable enhancement in performance, including a 49 % reduction in HER overpotential at 10 mA cm −2 , a 41 % increase in pseudo-first-order degradation kinetics of methylene blue in Fenton reaction, along with superior stability. In addition, the MNA 25 based flow reactor, which couples the two reaction and features a fastener-free design, demands just a minimal voltage of 1.61 V to drive, demonstrating impressive energy efficiency (81.56 % for HER and 2.77 g kWh −1 for Fenton) and application potential. More importantly, numerical simulations reveals that the larger pore size in MNA not only facilitated faster electrolyte diffusion, but also enhanced its impact buffer performance, thereby improving its catalytic activity and stability. Our work unveils the mechanism of mesopore size on the electrochemical performance of catalysts at the theoretical level, which offers a promising avenue for enhancing the energy efficiency of HER.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
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IF 4.4
A.O.M. Alzahrani,Haseebul Hassan,Muhammad Waqas Iqbal,A.O. Alosaimi,S. Alghamdi,A.A. Melaibari,S.A. Al-Ghamdi,T.S. Almoneef,R.M Azahrani,Yas Al-Hadeethi
In the quest to bolster the electrochemical efficiency of metal oxide electrodes for high-performance hybrid supercapacitors, the integration of phosphorus doping emerges as a pivotal method. This study delves into the fabrication process of a specialized P-CNT on Cu–ZnO/NPC composite through a meticulous in-situ synthesis followed by phosphating. The strategic incorporation of phosphorus heteroatoms orchestrates a profound alteration in the electronic structure of the Cu–ZnO/NPC matrix, effectively augmenting its storage capabilites. The electrode showcases a commendable specific capacitance of 1619C/g. Making this innovation into a hybrid supercapacitor configuration (P-CNT@Cu–ZnO/NPC //activated carbon) yields an impressive energy density of 56.13 Wh/kg at 1250 W/kg. Even after enduring 10,000 exhaustive testing cycles, the device remarkably retains 98.0 % of its initial capacitance, affirming the resilience and enduring performance of this tailored design. In oxygen evolution reaction (OER) application, the P-CNT@Cu–ZnO/NPC electrode demonstrated 43.26 mV/dec tafel slope. These groundbreaking findings underscore the transformative potential of the P-CNT@Cu–ZnO/NPC composite in shaping the landscape of future energy storage electrode materials.
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Nanoscale
·
2024
·Vol. 16
·期 26
·12492-12501
·
IF 5.8
Zhichang Hu,Zhizhong Xiao,Wei Wei,Jian Yang,Xiaoyu Huang,Qingcheng Lu,Sundaram Chandrasekaran,Huidan Lu,Yongping Liu
The surface electronic structure and morphology of catalysts have a crucial impact on the electrocatalytic hydrogen evolution reaction performance. This work reports on the fabrication of a Ru-doped WP/WP2 heterojunction nanosheet array electrode via a one-step phosphating treatment of a Ru-doped WO3 precursor. Benefitting from the large electrochemical active surface of nanosheet arrays, rich WP/WP2 heterojunction interface, and trace Ru atom doping, the catalyst has a fairly low overpotential of 58.0 mV at 10 mA cm−2 and a Tafel slope of 50.71 mV dec−1 in acid solution toward the electrocatalytic HER. Further, theoretical calculations unveil that Ru atom doping and interface effect synergistically optimized the electronic structure of the catalyst and hence weakened the adsorption capacity of the catalyst surface toward hydrogen (H), which lowered the Gibbs free energy (ΔGH*) and consequently effectively improved the HER performance. This work may open new avenues for developing advanced nanoarray electrodes with efficient electrochemical energy conversion.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Zhong Wang,Jinzhou Li,Shuang Yuan,Jinshuo Yang,Zhiqiang Jin,Xinjia Tan,Jie Dang,Wangzhong Mu,Guojian Li,Qiang Wang
FeCoNi-based high entropy intermetallic compounds are promising substitutes for noble metal catalysts for hydrogen evolution reaction (HER) and oxygen evolution (OER), while their activity is restricted by the synergistic effect between the elements. In this paper, the theoretical model of FeCoNiMnMoP bifunctional catalyst has been reasonably designed given the volcanic curve of M−H bond energy as a valuable guide for candidate metal elements. Theoretical calculations show that the synergistic effect between multiple sites not only accelerates the electron transfer but also reduces the rate-determining step (RDS) barrier. At the same time, the introduction of Mo also enhances the total density of states and reduces the d-band center, thus optimizing the adsorption and dissociation of intermediates. The experimental results confirm that the theoretical model has excellent catalytic performance. In the alkaline solution, FeCoNiMnMoP‖FeCoNiMnMoP requires only an ultra-low cell voltage of 1.49 V for overall water splitting when the current density is 10 mA cm −2 . In general, novel insights on the effects of intermetallic synergies on water decomposition are provided, which is helpful for the design of bifunctional catalysts based on volcanic diagrams.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Qiusheng Zhou,Minmin Song,Yuan Tian,Min Min,Shiqiang Cui,Xianying He,Chuanyin Xiong
The large-scale application of metal-air batteries strongly depends on the development of cost-effective, highly efficient, and durable bifunctional oxygen catalysts. In this work, a facile approach for preparing the monodisperse PtCo nanoalloy anchored the nitrogen-doped carbon nanotubes (PtCo/NCNT) for zinc-air batteries is reported. The nitrogen-doped carbon shell prevents PtCo nanoalloy from exfoliation, dissolution, and aggregation and enables the accessibility of electrolytes to the alloy surface and the electron transfer. Besides, the strong interaction between PtCo nanoalloy and nitrogen-doped carbon can efficiently modulate the electronic structure of the formed active sites. When used as a cathode catalyst, the constructed rechargeable zinc-air battery presents higher power density (268 mW cm −2 ), specific capacity (840 mAh g −1 ), and excellent stability. More importantly, the PtCo/NCNT catalyst allows the all-solid-state cell to exhibit remarkable flexibility and high round-trip efficiency at various bending states, demonstrating a potential possibility to replace the conventional Pt/C and RuO 2 catalysts.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Li Zhang,Youwen Li,Yuying Feng,Jiahui Jiang,Ting Zhao,Guancheng Xu
A trimetallic selenide electrocatalyst (Co, Fe, Ni)Se2 supported on nickel foam (NF) has been successfully synthesized for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The catalyst was fabricated through a two-step strategy involving the formation of metal-organic frameworks (MOFs) precursors followed by a selenization reaction. The optimized (Co, Fe, Ni)Se2/NF-3:1 exhibited remarkable OER activity with an overpotential as low as 170 mV to achieve 10 mA cm-2, along with excellent stability over 1000 cycles. Its superior UOR performance with even lower overpotential further demonstrates promise for urea-assisted energy-saving hydrogen production. The enhanced electrocatalytic performance originates from the synergistic electronic modulation between Co, Fe, and Ni, the rough surface morphology facilitating mass and charge transport, and the highly conductive NF substrate enabling efficient exposure of active sites. This work provides valuable insights into the design of efficient multimetallic selenide electrocatalysts for sustainable electrochemical energy conversion.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiannan Song,Jieting Zhao,Zhao Wang,Yongming Hu,Wanping Chen
It is important for metal oxides to continuously uphold applicable room–temperature gas sensing capability for hundreds of days for practical applications. In this study, an exploration has been conducted to maintain an extraordinary room–temperature hydrogen sensing capability for 1 wt% Pt–SnO 2 composite nanoceramics over a prolonged time in a practical way. Though as–prepared samples’ room–temperature responses to hydrogen weakened obviously with time, they were completely restored through mild heat treatments like 200 °C for 15 min using commercial Al 2 O 3 ceramic heating plates of 10 mm × 10 mm. With such ceramic heating plates to provide a periodic heat treatment of 200 °C for 15 min in every three days, a room-temperature response over 1000 to 1 % H 2 –20 % O 2 –N 2 has been continuously maintained for samples over 365 days. It is suggested that some heaters should be incorporated into future room–temperature metal oxide gas sensors, whose periodic heat treatment will be crucial to maintain room–temperature gas sensing capability at minimum energy consumption for the sensors over their lifespan of service.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Mingzhi Zhang,Shujuan Wang,Hongwei Guo,Fan Lv,Tianjiao Ling,Yi Cao,Hongwei Li,Huihua Wang,Jinxin Chen,Ruiqi Guo
Self-supported electrodes featuring transition metals encapsulated within carbon nanotubes (CNTs) are promising bifunctional catalytic electrodes for overall water splitting due to their binder-free fabrication (eliminating costly Nafion), high electrical conductivity, mechanical strength, and low cost. However, challenges remain, including insufficient catalytic activity and stability, as well as underutilization of the CNTs’ functionality. Herein, we strategically modified a Fe-based self-supported electrode with ultrafine IrOx nanoclusters (IrOx NCs), creating Fe@CNTs/IrOx NCs/CC, which exhibits enhanced bifunctional performance for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH. The optimized Fe10@CNTs/IrOx NCs/CC requires low HER and OER overpotentials of 36.7 mV and 203.5 mV at the current density of ± 10 mA cm–2. It also shows a high mass activity of 214.8 A gIr–1 at 100 mV. Moreover, water splitting cells employing Fe10@CNTs/IrOx NCs/CC as both the anode and cathode require only 1.50 V to reach 10 mA cm–2 and demonstrate stable operation exceeding 100 h. Detailed theoretical calculations prove that the IrOx NCs synergistically enhance HER kinetics by promoting both the H2O adsorption-dissociation efficiency and optimized *H desorption. For the OER process, they significantly lower the energy barrier of the rate-determining step (*O → *OOH), thereby accelerating the overall water splitting process of Fe10@CNTs/IrOx NCs/CC. This work highlights an innovative research route for boosting the water splitting performance through targeted modification of the self-supported electrode.
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Nature Communications
·
2025
·Vol. 16
·期 1
·10327
·
IF 15.7
Li Zixiao,Liang Jie,Hong Shaohuan,Ren Yuchun,Zhang Min,Sun Shengjun,Cai Zhengwei,Yang Chaoxin,Wang Hefeng,Luo Yongsong,Liu Shanhu,Yao Yongchao,Gong Feng,Sun Xuping,Tang Bo
While coastal renewable energy-powered seawater electrolysis is highly promising for green H 2 production, the anodic chemical corrosion by aggressive chlorine chemistry and violent bubble release-induced physical damage to anodes are two long-standing issues that lead to inferior stability. Here we pursue integrating triple protection to a monolithic catalyst to concurrently alleviate chlorine chemistry and weaken external forces from bubble escaping/collapsing. The 1 st and 2 nd defenses are a Co-phosphate (Co-Pi) outer layer closely connected to CoP and well-dispersed nanosized γ-MnO 2 in/on Co-Pi, which collectively and preferentially filter out chloride ions approaching the catalytic sites based on their semipermeable natures. The 3 rd defense comes from structural features that specialize in lessening the forces of bubble movements on the catalyst. A cage-shaped array composed of tip-connected nanowires with rough surfaces is verified to possess enhanced mechanical stability by theoretical simulations and experiments. This triple-protected electrocatalyst achieves a 3000-h electrolysis lifespan in real seawater during the ampere-level current density operation, demonstrating a multi-defense electrode design with guiding significance for wide applications.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lihua Shen,Jiaming Peng,Qili Chen,Yaozhou Zhang,Chunxia Yu,Yuchen Tang,Jin Li,Kunpeng Zhao,Zhifang Zhang
The development of rapid, sensitive ammonia (NH 3 ) sensors is crucial for emergency response as NH 3 poses serious health risks. We report a high-performance chemiresistive sensor based on Ti 3 C 2 MXene@sulfur nanosheet (MXene@S-NSs) composites that addresses the conductivity limitations of pure S-NSs. The composite combines MXene’s excellent conductivity with S-NSs’ semiconductor properties to create room-temperature NH 3 sensors with exceptional performance: 3 ppt detection limit, 375 % response signal, and remarkably fast response/recovery times of 5 s/4s − representing a significant improvement over pure S-NSs sensors. This enhancement arises from optimized charge transport through p-n heterojunctions and sulfur vacancies in the composite structure. The MXene@S-NSs material demonstrates outstanding sensitivity, stability, and response speed, making it particularly suitable for emergency NH 3 monitoring applications. This work not only presents a practical sensor solution but also establishes an effective materials design strategy for developing next-generation gas sensors through rational 2D material hybridization. The successful integration of MXene and S-NSs provides a blueprint for creating advanced sensing materials with tailored electronic properties and performance characteristics.
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NANOTECHNOLOGY
·
2025
·Vol. 36
·期 33
·335401
·
IF 2.8
Shaojian Jiang,Beibei Wang,Kai Deng,You Xu,Ziqiang Wang,Hongjing Wang,Liang Wang,Hongjie Yu
Water splitting represents a pivotal technology for green hydrogen generation, yet its practical application remains constrained by the sluggish kinetics of the oxygen evolution reaction (OER). To address this challenge, we propose a hybrid electrolysis system that replaces OER with the thermodynamically favorable glycerol oxidation reaction, thereby enabling energy-efficient hydrogen production coupled with value-added chemical synthesis. In this work, we reported a bifunctional self-supporting electrocatalyst for the growth of nitrogen-doped carbon shell NiFeNx nanosheets on carbon fibers (NC@NiFeNx) that can be applied to efficient hydrogen production and formate generation. The system can be achieved with a cell voltage of only 1.38 V at 10 mA cm−2, which is lower than the overall water electrolysis (1.70 V). Notably, the system achieves exceptional Faradaic efficiencies of 99.7% for hydrogen evolution and 95% for formate generation. This work establishes an innovative strategy for co-producing H2 and valuable chemicals through glycerol valorization, while addressing key energy challenges in conventional water electrolysis.
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