JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Daoxin Liu,Yang Yang,Jianan Zhang,Lumeng Wang,Ziwen Ma,Li Ren,Jiaqi Wang,Bing Xue,Fangfei Li
The electrochemical oxygen evolution reaction (OER) is a fundamental anodic semi-reaction used in the hydrogen energy industry. Herein, we report a novel NiFe-layered double hydroxide (NiFe-LDH)-based hybrid catalyst for the OER, which is promoted by the two-step hydrothermal loading of carbon sphere (CS) onto NiFe-LDH sheets, named as NiFe-LDH@CS. The effects of hydrothermal carbonization (HTC) parameters (such as hydrothermal time and glucose concentration) and the loading ratio of CSs on NiFe-LDH@CS were investigated. The results showed that the two-step hydrothermal synthesis significantly inhibited the interference of the carbonized substances on the lattice formation of NiFe-LDH and successfully achieved a firm combination. By adjusting the HTC process, the surface characteristics and graphitization degree of the carbonized microspheres can be effectively controlled, leading to increased OER performance of NiFe-LDH@CS. Thus, under the optimal process parameters (5 h, 0.6 M, and 5 mL), NiFe-LDH@CS exhibited an excellent overpotential of 292 mV at 50 mA cm -2 and 372 mV at 100 mA cm -2 for the OER. The outstanding OER performance of NiFe-LDH@CS is attributed to the excellent morphology control of the composite, abundant functional groups, and suitable graphitization degree of the hydrothermally carbonized CS, as well as the synergistic effect between the CSs and NiFe-LDH.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 28
·9714-9720
·
IF 4
Sirui Liu,Yuxin Shi,Lingling Xu,Weican Zhan,Meixi Chen,Xiaoyue Pan,Yuqing Yao,Jiajie Cai,Mingyi Zhang,Xinzhi Ma
Designing an excellent OER catalyst in an alkaline environment is severe yet essential for industrial H2 application under the electrochemical technique. This study has achieved multiple modifications on CoN nanowires, the classic OER catalyst, via a facile room-temperature NaBH4 spontaneous hydrolysis. This facile process simultaneously generates oxygen vacancies and robust BN species. It wraps hydrophilic BOx motifs on the OER response CoN nanowires, producing OER active Co–N–B species, increasing active numbers and guaranteeing structural stability. It suggests that a low NaBH4 concentration (0.1 mol L−1) treatment endows CoNNWAs/CC with excellent OER performance and robust structure, which can drive a current density of 50 mA cm−2 with only 325 mV overpotentials with more than 24 hours’ durability. Even, the catalyst can drive 1000 mA cm−2 around 480 mV overpotential. This study allows a novel strategy for designing high-performance OER catalysts.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2023
·
IF 5.6
Shixiong Min,Zhe Meng,Yaoyao Zhao,Wenjing Li,Zhengguo Zhang,Fang Wang
Developing cost-effective and efficient hydrogen/oxygen evolution reaction (HER/OER) electrocatalysts that can work stably at industrial-level current densities is of paramount importance for the scalable implementation of water electrolysis. Herein, a monolithic chainmail electrode is fabricated by embedding self-phosphorized graphitic carbon-encapsulated Co2P nanoparticles within a hierarchically porous carbon membrane matrix (Co2P@CTF) via the direct carbonization of a Co2+-cross-coupled soybean protein framework. While formulating the soybean protein framework into a hierarchically porous, mechanically strong, and conductive carbon membrane, the endogenous N and P sources enable the heteroatom doping of the carbon matrix while simultaneously yielding graphitic carbon-encapsulated Co2P nanoparticles. Such an integrated Co2P@CTF monolithic electrode exhibits remarkable alkaline water splitting performance with low overpotentials of 177.5 and 388.4 mV at 100 mA cm−2 for the HER and OER, respectively, with excellent stability for the HER even at 1000 mA cm−2 over 100 h and for the OER at 100 mA cm−2 for >50 h. An electrolyzer assembled using Co2P@CTF requires a cell voltage of 1.69 V at 10 mA cm−2 with a high solar-to-hydrogen (STH) conversion efficiency of 16.8% when powered using a commercial silicon solar cell. This work opens a new avenue for scalable fabrication of monolithic chainmail electrodes with desirable functionalities for sustainable electrochemical energy conversion.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 24
·8456-8465
·
IF 4
Qingfei Li,Nan Li,Mianmian Wu,Guifang Sun,Wenjing Shen,Minghao Shi,Jiangquan Ma
Stable and efficient bifunctional electrocatalysts are of great significance for sustainable energy conversion and human society sustainability. However, conventional electrocatalytic materials tend to exhibit high overpotentials and unsatisfactory chemical activities. Herein, we construct novel CoNi2S4/C3N4 nanowires on a nickel foam (NF) electrode as a bifunctional electrocatalyst for alkaline water splitting by a two-step hydrothermal and thermal annealing process. The prepared CoNi2S4/C3N4 electrocatalyst exhibits superior HER (e.g. 40 mV (ηH210)) and OER (e.g. 110 mV (ηO210)) activities in a 1 M KOH electrolyte, which are much smaller than those of bare NF, Co@NF, NiCoO@NF and most reported materials. Furthermore, the stability test at 10 mA cm−2 for 20 h for the CoNi2S4/C3N4 electrocatalyst shows no obvious decay and proves the excellent stability of CoNi2S4/C3N4. In this work, the unique tentacle-like CoNi2S4/C3N4 nanowire nanostructure leads to minimized interfacial resistance and abundant channels during electrocatalysis. Moreover, comprehensive analysis results show that Ni(Co)OOH active sites, which are beneficial for excellent OER activity, partially form on the surface of CoNi2S4/C3N4 during electrocatalysis. Finally, the CoNi2S4/C3N4∥CoNi2S4/C3N4 two-electrode system is constructed and it exhibits a low-voltage water splitting capability of 1.40 V.
研究领域:
材料科学
·
电化学
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能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Fan Wang,Shuhui Chen,Zhi Tong,Xinyang Liu,Hongyu Zhou,Yinsheng He,Guogang Shu,Ying Jin,Wenyue Zheng
High-entropy alloy nanoparticles (HEA NPs) attract considerable attention in electrocatalysis owing to their tunable electronic structures and enhanced catalytic activity enabled by multicomponent synergy. However, the optimization of multimetal electronic structures, particularly through electronegativity differences to maximize their hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in a single catalyst, remains technically challenging. In this work, PtFeNiCoX (X: Cu, Mo, Mn) HEA NPs with electronegativity-regulated HER and OER catalysis were synthesized via a transient high-temperature shock method (THTS), using carbonized wood (CW) as a self-supporting electrode substrate. The results demonstrate that the electronegativity differences among the mixed elements in HEA induced charge redistribution, generating high-activity Cu and Pt sites. These sites can simultaneously stabilize OH* and H* intermediates, thereby significantly improving water dissociation efficiency under alkaline conditions. At 10 mA cm–2, PtNiCoFeCu showed excellent HER and OER overpotentials of 10 mV and 164 mV, respectively, with high stability. As both the anode and cathode material in the overall water splitting, it required only 1.48 V to reach 10 mA cm–2. This work presents a cost-effective strategy for synthesizing high-entropy alloys as efficient electrocatalysts, demonstrating great potential for sustainable hydrogen production through water electrolysis.
研究领域:
材料科学
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电催化
·
能量转换
·
纳米材料
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可持续能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SN Applied Sciences
·
2019
·Vol. 1
·期 3
·1-10
·
IF 0
He Shiwei,Xu Ruidong,Guo Yuqing,Zhao Zhuo,Yu Bohao,Xiao Saijun,Lv Huihong
In this study, β-PbO 2 –Co 3 O 4 composite coatings were synthesized on a substrate using the electrodeposition method in an electrolyte containing Pb 2+ and Co 3 O 4 particles. The preparation process study shows that the β-PbO 2 bath containing Co 3 O 4 particles becomes more stable for an ultrasonic dispersion time within 30 min, with the stability beginning to decrease after the ultrasonic time exceeds 30 min. Co 3 O 4 particles in the β-PbO 2 bath are positively charged, with anions being adsorbed onto the particles. The nucleation behavior study shows that the electric field force plays a dominant role in the adsorption process for the Co 3 O 4 particles. The nucleation and growth of β-PbO 2 on the Co 3 O 4 particles started for the particles closer to the substrate. In addition, the thickness of the β-PbO 2 layer on the Co 3 O 4 particles was inversely proportional to the distance between the Co 3 O 4 particles and the substrate. Compared to the pure PbO 2 electrode, the oxygen evolution overpotentials for the β-PbO 2 –Co 3 O 4 electrode are decreased significantly, which demonstrates an energy-saving effect.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
MOLECULES
·
2025
·Vol. 31
·期 1
·
IF 4.6
Mingyu Liu,Bowen Pei,Hongyu Ba,Wei Ni,Huaheng Zhao,Shuang Chen,Jiamin Zhao,Jinsheng Zhao
The oxygen evolution reaction (OER) in water splitting involves complex multi-electron–proton transfer processes and represents the rate-determining step limiting overall electrolysis efficiency. Developing non-noble-metal catalysts with high activity and stability is therefore essential. Herein, a heterogeneous synthesis strategy was employed to in situ construct an iron-rich layered sulfate precursor (Fe0.42Co0.58-SO4/NF) on nickel foam, which underwent deep self-reconstruction in alkaline electrolyte to form nanoflower-like Fe0.42Co0.58OOH/NF. The optimized catalyst maintained its iron-rich composition and hierarchical structure, delivering outstanding OER performance with an overpotential of 220 mV at 10 mA·cm−2, a Tafel slope of 31.9 mV·dec−1, and stability exceeding 12 h at 600 mA·cm−2. Synchrotron analyses revealed dynamic transitions between mono-μ-O and di-μ-O Fe–M (M = Fe, Co) oxygen bridges during reconstruction, which enhanced both structural robustness and active-site density. The Fe-rich environment promoted the formation of Fe3+–O–Fe3+units that synergized with Co4+species to activate the lattice oxygen mechanism (LOM), thereby accelerating OER kinetics. This work elucidates the key role of oxygen-bridge geometry in optimizing catalytic activity and durability, providing valuable insights into the rational design of Fe–Co-based non-noble-metal catalysts with high iron content for efficient water oxidation.
研究领域:
电催化
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材料科学
·
能量转换
·
水分解
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2026
·
IF 2
Sahar G. Tawfik,Lamia Abu El Maati,Muneerah Alomar,Latifah bader Al-muhydeb,Waqas Ul Arifeen,Rizwan Ul Hassan,Abhinav Kumar
Environmental deterioration and energy shortages are worldwide issues, necessitating usage of alternative energy ways to reduce usage of fossil fuels. Electrochemical water splitting is an innovative process for creating renewable energy from hydrogen fuel; however, the slow rate of oxygen evolution reaction (OER) limits its effectiveness. Therefore, the development of new catalytic materials exhibiting high activity and durability for OER has emerged as a primary research focus. In the present work, TbMnO₃/PANI hybrid was prepared by hydrothermal technique for OER. The prepared samples were assessed via several approaches to ascertain their physicochemical features. Compared to pure TbMnO₃, the TbMnO₃/PANI catalyst delivered low η (overpotential) of 201 mV at benchmark current density (j) of 10 mA/cm 2 , suggesting improved catalytic efficacy. The TbMnO₃/PANI nanohybrid exhibited a considerably improved ECSA (electrochemically active surface area) of 412.5 cm 2 and notably greater C dl (double-layer capacitance) of 16.5 mF/cm 2 . Moreover, the nanohybrid demonstrated outstanding endurance of 50 h, as assessed through chronoamperometry test. The results suggest that the designed electrocatalyst may substantially enhance OER performance, offering a feasible approach for advancing future renewable energy applications.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haodong Zheng,Xiaoxiang Wang,Kaile Shi,Yidong Hu,Wenxuan Lv,Pengfei Yin,Chengze li,Libo Sun,Jingjing Wang,Boxiong Shen,Hui Liu
Electrochemical organic oxidation has shown great industrial potential due to its green, low-carbon, and energy-efficient advantages. However, the competing oxygen evolution reaction (OER) severely impacts the faradaic efficiency and conversion rate of organic oxidation reactions. In this work, we report a method that can promote the oxidation of 5-hydroxymethylfurfural (HMFOR) while suppressing the OER, which is achieved by etching NiMnFe-LDH with N,N-dimethylacetamide (DMF), resulting in the formation of numerous cationic defects. Specifically, at a current density of 50 mA cm–2, the applied potential for HMFOR decreased by 50 mV, while the OER potential increased by 30 mV. In situ electrochemical impedance spectroscopy found faster reaction kinetics for d-NiMnFe-layered double hydroxide (LDH) compared to that of NiMnFe-LDH in HMFOR, whereas an opposite trend was observed in the OER, confirming that the DMF treatment has opposite effects on the transportation of organic molecules and OH–. To further investigate the reaction pathways and evolution of intermediates during HMFOR, in situ infrared spectroscopy and theoretical calculations were conducted, which demonstrate that cationic defects not only significantly enhance the adsorption of intermediates but also lower the reaction energy barrier, thus accelerating the reaction rate of HMFOR. This work provides a potential strategy for developing industrial-grade electrocatalysts for high current densities.
研究领域:
电化学
·
催化
·
材料科学
·
绿色化学
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能量转换
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Dan Wang,Yihang Yu,Huan He,Zenghui Li,Xiaojing Wen,Yanguo Liu,Xiwei Qi,Zhiyuan Wang
The emerging high entropy oxide (HEO) with homogenously distributed multicomponent featuring great adjustability of composition and electronic structure shows attractive electrocatalyst performance. Herein, the SO 4 2- -modified (Fe 0.2 Co 0.2 Ni 0.2 Cr 0.2 Mn 0.2 ) 3 O 4 grown on the hollow carbon sphere (HCS) has been prepared using a microwave-solvothermal strategy. The introduction of thioacetamide during the formation of HEO leads to the in-situ generation of SO 4 2− on the surface of HEO, which not only drives surface morphology and crystal structure evolution to expose more electrochemical active sites, but also intensifies surface reconstruction, including the formation of more hypervalent active metal ions, and the reduction of the reconstruction potential, thus improving the catalytic activity. The amorphous high-entropy structure with unsaturated coordination encourages more active sites generation. The HCS carriers effectively disperse the HEOs and promote gas release and electron transfer. As a return, the SO 4 2- -modified HEO/HCS shows decreased charge transfer impedance and improved electrochemical active surface areas. The catalyst with the optimal S content exhibits a low overpotential of 237 mV at 10 mA cm −2 and Tafel slope of 40.38 mV∙dec -1 in 1 M KOH, as well as outstanding durability in 80 h. This work provides a comprehensive design route for the high-efficient high entropy electrocatalyst for OER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2025
·
IF 9.1
Yu Xia,Weiyuan Chen,Priscila Vensaus,Yiwei Sun,Yunchang Liang,Magalí Lingenfelder,Wenbo Ju
Magnetic-field enhancement of the oxygen evolution reaction (OER) represents a promising route toward more efficient alkaline water electrolyzers, yet its origin remains debated due to overlapping effects of mass transport and reaction kinetics. Here, we present a general experimental strategy that employs strong forced convection to suppress uncontrolled transport arising from natural diffusion and magnetohydrodynamic (MHD) flows. Using polycrystalline Au electrodes, we show that this approach resolves subtle OER variations under controlled flow and field conditions. Notably, spontaneous MHD flows near hard-magnetic electrodes are identified for the first time, highlighting a major complication in interpreting magnetic effects. Forced convection eliminates these artifacts, enabling reliable quantification of intrinsic activity changes. Systematic analysis of 3d transition-metal catalysts reveals a clear composition dependence: Fe-based catalysts exhibit the strongest magnetic enhancement, followed by Mn and Co, whereas Ni shows minimal response. Moreover, synergistic interactions between different elements further modulate the effect. By decoupling magnetic influences on mass transport from those on kinetics, this method provides a universal framework to assess how magnetic fields alter electrocatalysis.
研究领域:
电催化
·
材料科学
·
物理化学
·
能源化学
·
界面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 24
·6018
·
IF 4.2
Qianqian Dong,Qijun Zhong,Jie Zhou,Yuhao Li,Yujing Wang,Jiayang Cai,Shuangwei Yu,Xiong He,Shaohui Zhang
The oxygen evolution reaction (OER), which involves a four-electron transfer and slow kinetics, requires an efficient catalyst to overcome the high energy barrier for high-performance water electrolysis. In this paper, a novel Ni3S2@V-NiFe(III) LDH/NF catalyst was prepared via a facile two-step hydrothermal method. The constructed heterostructure of Ni3S2@V-NiFe(III) LDH increases the specific surface area and regulates the electronic structure. Furthermore, the introduction of the V element forms an electron transport chain of Ni-O-Fe-O-V-O-Ni, which optimizes the binding energy between metal active sites and oxygen evolution reaction intermediates, accelerates electron transfer, and improves self-reconstruction. With this dual regulation strategy, Ni3S2@V-NiFe(III) LDH/NF exhibits exceptional OER performance with an overpotential of 280 mV at 100 mA/cm2and a Tafel slope of 45.4 mV/dec. This work develops a dual regulation strategy combining heterostructure formation and the doping effect, which are beneficial in the design of efficient OER catalysts.
研究领域:
材料科学
·
电化学
✓ 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）