ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xin Dai,Yanfei Xin,Yuanzhen Chen,Qiang Tan,Yongning Liu
Water-splitting by electrolysis is one of the most important approaches to produce hydrogen as renewable clean energy with superior advantages of high-purity and good operability. But the key issue limiting the large-scale application is that it demands a much higher overpotential than the theoretical oxygen evolution potential. Herein, we report an efficient electrochemical catalyst of NiFeBO synthesized via a facile one-step process, presenting remarkable catalytic activity and long-term stability. In this work, we discussed the effects of the doping of Fe and the insertion of BO 2 − in the as-synthesized NiFeBO. According to the experimental results, NiFeBO shows a very low overpotential of 256 mV and a Tafel slope of 53 mV dec −1 with remarkable stability over 60 h of chronopotentiometry test. The inserted anion of BO 2 − can adsorb OH − in electrolyte around the catalyst to increase the concentration of OH − around the active sites, thereby improving the effectivity of oxygen evolution reaction. In addition, diffused micro-crystalline with different lattice formed during the oxidation of the as-synthesized catalyst, providing more active sites than the pristine amorphous.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Lifang Chen,Rizwan Ur Rehman Sagar,Jun Chen,Juan Liu,Sehrish Aslam,Farhat Nosheen,Tauseef Anwar,Naveed Hussain,Xinmei Hou,Tongxiang Liang
Hydrogen production from water splitting is highly desired for the green and clean energy device but remains a great challenge. In this regard, cobalt-phthalocyanine (PyCoPc) and composite of PyCoPc with graphene oxide (GO) were fabricated and used as catalyst for the energy conversion. The as-synthesized PyCoPc/GO exhibits an efficient hydrogen evolution reaction due to the low overpotential ~253 mV at a 10 mA cm −2 current density with a Tafel slope ~96 mV dec −1 in alkaline media . Our study reveals that the active area of the catalyst was controlled with the help of π − π stacking interaction between GO and PyCoPc. Technologically, a highly efficient PyCoPc catalyst was developed for hydrogen evolution reaction.
研究领域:
能源材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hassanien Gomaa,Cuihua An,Penggang Jiao,Wenliu Wu,Hassan A.H. Alzahrani,Mohamed A. Shenashen,Qibo Deng,Ning Hu
Owing to the high cost of precious metal catalysts for the oxygen evolution reaction (OER), the production of highly efficient and affordable electrocatalysts is important for generating pollution-free and renewable energy via electrochemical processes. A facile hydrothermal approach was employed to synthesize hybrid mesoporous iron-nickel bimetallic sulfides @ P, N -doped carbon for the OER. The prepared Fe 0.5 NiS 2 @C exhibited an overpotential (η) of 250 mV at 10 mA/cm 2 . This exceeded the overpotentials recently reported for surface-modified P, N -doped carbon-based catalysts for the OER in a 1 M KOH medium. Moreover, the Fe 0.5 NiS 2 @C catalyst showed a notable Tafel slope of 90.5 mV/dec with long-dated stability even after 24 h at 10 mA/cm 2 . The superior OER performance of the Fe 0.5 NiS 2 @C catalysts may be due to their large surface area , sheet-like morphology with abundant active sites, fast transfer of mass and electrons, control of the electronic structure by co-treatment with heteroatoms (e.g., P and N), and the synergistic effect of bimetallic sulfides, making them favorable catalysts for the oxygen evolution reaction. Density functional theory (DFT) calculations showed that the Fe 0.5 NiS 2 @C catalyst exhibited strong H 2 O-adsorption energy. The enhanced OER activity of Fe 0.5 NiS 2 @C was attributed to its higher surface area, favorable H 2 O adsorption energy , improved electron transfer efficiency, and lower Gibbs free energy compared to those of the other proposed catalysts.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 35
·19466-19475
·
IF 4.22
Ding Jinjin,Zhang Mengke,Wei Xiaoqing,Song Wenwu,Wang Jin,Sun Tongming,Zhu Jinli,Wang Minmin
A rational structural strategy to design rambutan-like NiFe-LDH nanocluster arrays electrode via a buffer-salt-assisted hydrothermal method was reported. For our developed electrode, large stable current density of 100 and 200 mA cm −2 at overpotential of only 283 and 300 mV in oxygen evolution reaction in alkaline electrolyte was obtained, which is dramatically lower than many previous reported overpotentials. It also exhibits low Tafel slope at current range from 10 to 25 mA cm −2 (56.47 mV dec −1 ). Further analysis demonstrates the key role of higher carriers of the rambutan-like NiFe-LDH nanocluster arrays electrode in boosting the water-splitting performance of the resulting system. Benefiting from the fine geometry shape of the self-supported nanocluster nanoarrays electrode, the transfer process of the reactants and oxygen/hydrogen bubbles is accelerated. In addition, a 19-time enhancement of carrier concentration for our developed rambutan-like NiFe-LDH nanoclusters (2.9 × 10 29 m −3 ) is obtained. Notably, the resultant rambutan-like NiFe-LDH nanocluster arrays electrode exhibits enhanced stability (in high and low current density) for the full water splitting in 1 M KOH, remaining nearly 100% of the original current density after continued testing for 20 h. This finding may provide new insight on rational structural design LDH nanostructures with high performance for electrocatalysis. Graphic abstract A highly hydrophilic NiFe-LDH nanocluster arrays electrode is developed for efficient full water splitting. Large and stable current density of 200 mA cm −2 is obtained at overpotential of 300 mV. Besides, the faraday efficiency is nearly 100%.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Lei Yuxi,Xiao Xuefeng,Ma Tianpeng,Li Weiyin,Zhang Huan,Ma Chao
Layered transition metal dichalcogenides (TMDs), such as molybdenum ditelluride (MoTe2), have attracted much attention because of their novel structure-related physicochemical properties. In particular, semi-metallic-phase MoTe2 (1T′) is considered as a competitive candidate for low-cost electrocatalysts for water splitting. However, there are few reports on the simple hydrothermal synthesis of MoTe2 nanostructures compared with other layered TMDs. In this study, a facile one-step hydrothermal process was developed for the fabrication of layered MoTe2, in which uniform nanotubes with a few layers of 1T′ MoTe2 were fabricated at a lower temperature for the first time. The as-obtained MoTe2 nanotubes were fully characterized using different techniques, which revealed their structure and indicated the presence of layered 1T′ nanocrystals. The efficient activity of MoTe2 nanotubes for the electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 was demonstrated by the small Tafel slope of 54 mV/dec−1 and endurable ability, which is attributed to the abundant active sites and remarkable conductivity of 1T′ MoTe2 with a few-layer feature. This provides a facile method for the design and construction of efficient layered MoTe2 based electrocatalysts.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Fengxiang Sun,Shan Zhu,Zixun Liu,Chang Liu,Kezhu Jiang,Yangyang Zhang,Biao Chen,Shijian Zheng
In evaluating the oxygen evolution reaction (OER) electrocatalysts, a lower Tafel slope signifies a reduced overpotential requirement to achieve a given current density. Metal oxides have attracted considerable attention as promising OER catalysts due to their natural abundance and high catalytic activity. However, the factors influencing the Tafel slope of metal oxides are inherently complex, encompassing both intrinsic material properties and extrinsic experimental conditions. In this study, we pioneer a data-driven approach integrated with experimental synthesis to investigate the key parameters affecting the Tafel slope of metal oxide OER catalysts. Leveraging a comprehensive database sourced from extensive literature and multiple machine learning (ML) algorithms, we have identified the specific surface area (SSA) as a crucial parameter for optimizing the Tafel slope. This represents a data-driven discovery that has remained unexplored in studies on the OER. Guided by these insights, we developed a sacrificial carbon template method to synthesize 3D mesoporous network NiCo 2 O 4 (3D-MN NiCo 2 O 4 ) with structural advantages. This unique architecture achieves high SSA (132.3 m 2 g −1 ), uniform nanoscale particles, and enhanced conductivity through its 3D interconnected network, enabling superior mass/charge transport efficiency. The catalyst demonstrates low Tafel slope (38 mV dec −1 ) across wide current densities, minimal overpotential (0.304 V@10 mA cm −2 ), and good stability (>100 h@10 mA cm −2 ), outperforming RuO 2 and conventional nanoparticles. Remarkably, the synthesis strategy shows generalizability, successfully extending to MnCo 2 O 4 , FeCo 2 O 4 , FeNi 2 O 4 , and high entropy oxides. This work bridges theoretical data analysis with practical catalyst design, establishing a versatile strategy for developing advanced electrocatalysts.
研究领域:
材料科学
·
电化学
·
数据科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yuqiao Wang,Chuanyong Jian,Xu He,Wei Liu
The development of a highly efficient hybrid catalyst is desirable for the water splitting to produce hydrogen . MoSe 2 is one of the low-cost candidates; however, its activity for hydrogen evolution reaction (HER) is still not satisfactory due to the low conductivity and poor electrical contact with the charge collection substrate. Herein, we provide a simple approach of synthesizing vertically aligned MoSe 2 nanoplatelets on the urchin-like HER-active conductive CoSe 2 nanowire array. Nanostructured MoSe 2 /CoSe 2 hybrid catalysts obtained a current density of 10 mA cm −2 at overpotentials of only 129 mV, with a small Tafel slope of 38.2 mV dec −1 , which is superior to those of most transition metal dichalcogenides (MoSe 2 , MoSe 2 –CoSe 2 hybrids, and so on). The abundant exposed active sites of MoSe 2 , as well as an efficient electrical contact between MoSe 2 nanosheets and CoSe 2 nanowires, which is beneficial for the outstanding HER performance of MoSe 2 /CoSe 2 hybrid electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Chen Yonghui,Zhao Jiafu,Song Mingzhu,Luo Shaojuan,Xie Shaoqu,Yan Kai
The development of safe, low-cost and highly active non-precious metal electrocatalysts plays a vital role in efficient hydrogen production. Herein, Mo 2 C/Mo 2 N heterostructure was in-situ synthesized by a two-step method for excellent hydrogen evolution performance at a universal pH range. The results show that the optimized MoCN-750-2h only needs 86.5, 102.5 and 120.5 mV overpotentials to reach 10 mA·cm −2 in alkaline, acidic and neutral media, respectively. Not only that, MoCN-750-2h had a low Tafel slope (37.2 and 88.5 mV·dec −1 ) in alkaline and neutral media, implying that catalytic kinetic is close to the level of Pt/C. These results can be attributed to reasonable C and N content in MoCN-750-2 h, optimizing the electron cloud distribution of Mo 2 C/Mo 2 N heterostructure to boost hydrogen production. Graphical Abstract MoCN heterostructure was in-situ synthesized by a two-step method for excellent hydrogen evolution performance at a universal pH range. The optimized electron cloud distribution of Mo 2 C/Mo 2 N would promote the formation of electron transfer channels, boosting the hydrogen evolution catalytic activity of the heterostructure. The MoCN heterostructure only needs 86.5,102.5 and 120.5 mV overpotentials to reach 10 mA·cm −2 in alkaline, acidic and neutral media, respectively. Not only that, MoCN-750-2 h had a low Tafel slope (37.2 and 88.5 mV·dec −1 ) in alkaline and neutral media, implying that catalytic kinetic is close to the level of Pt/C.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Kai Deng,Zilong Lian,Wenxin Wang,Jiabao Yu,Qiqi Mao,Hongjie Yu,Ziqiang Wang,Liang Wang,Hongjing Wang
Despite the fruitful achievements in the development of high-performance catalysts, most of materials still suffer limited HER kinetics and poor durability in harsh acidic media, especially at high current densities . In this work, a Pd nanoparticles/Ir metallene heterojunction structure (Pd/Ir hetero-metallene) were successfully prepared by a facile co-reduction method. The hydrogen spillover bridging H + adsorption/H 2 desorption process occurring at the Pd/Ir interface results in the rate-determining step change to a Tafel step, which accelerates the HER kinetics. The Pd/Ir hetero-metallene has a relatively low Δ G Hads (-0.19 eV), which allows for rapid adsorption of H + and release of H 2 , thus greatly improving the performance of HER. As a result, the Pd/Ir hetero-metallene exhibits remarkable HER performance with ultra-low overpotentials of only 69 and 133 mV to reach 500 and 1000 mA cm −2 , a small Tafel slope of 21 mV dec −1 , and superb stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Pei Yu,Fengting Luo,Shijian Chen
Rational designing Mo-based heterojunction catalysts as hydrogen evolution catalysts is seriously significant for the widespread utilization of hydrogen energy. Here, the ingenious hierarchical construction of MoP 2 /MoS 2 nanowires was delivered with high conductivity of porous MoP 2 and abundant active sites of defect-rich MoS 2 . Under synergistic effect of two materials, this catalyst achieves a dramatically optimized electronic structure to boost hydrogen evolution in all-pH range. The optimal MoP 2 /MoS 2 /CC nanoreactor showed overpotentials of 47.11, 60.16, and 89.83 mV to drive −10 mA cm −2 and Tafel slopes of 51.69, 52.04, and 73.79 mV dec −1 in acidic, alkaline, and neutral media, respectively. This finding may provide an effective approach for elevating the pH-universal electrocatalytic performance in order to achieve industrial hydrogen evolution.
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 5
·期 4
·659-664
·
IF 4.136
Dawen Yang,Ying Gu,Xu Yu,Zixia Lin,Huaiguo Xue,Ligang Feng
Graphical Cheap and cheerful : Nanostructured Ni 2 P−C was demonstrated as an efficient catalyst for urea electrooxidation. The material exhibited an excellent catalytic ability and was found to display improved charge-transfer kinetics towards urea electrooxidation. Nickel-based materials are a type of cost-effective catalyst for urea oxidation. Herein, we first reported nanostructured Ni 2 P−C as an efficient catalyst for urea electrooxidation. The Ni 2 P−C catalyst was prepared by a facile hydrothermal method and the structure and morphology were further characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The hexagonal crystal structure for Ni 2 P was indicated by the characteristic peaks in the XRD patterns, and lattice fringes of Ni 2 P were clearly observed in the high-resolution TEM images. The catalytic ability for urea electrooxidation was studied by cyclic voltammetry and chronoamperometry techniques. It was found that the current density at 0.5 V was ca. 70.4 mA cm −2 , about 2.7 times higher than that of the referenced commercial nickel oxide catalyst. A good catalytic stability for urea oxidation was also obtained. A diffusion-controlled process was observed for urea oxidation on Ni 2 P catalyst while the active sites arising from Ni(II) ion oxidation was following a surface-redox-reaction-controlled process. Kinetics studies by impedance spectroscopy and Tafel slope analysis displayed improved charge-transfer kinetics towards urea electrooxidation. The results demonstrated that Ni 2 P would have potential applications for catalytic urea oxidation.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 31
·19968-19978
·
IF 10.7
Zicheng Huang,Wenjie Shao,Yijuan Zheng,Junyu Wang,Mao Wang,Shuang Li,Xiaohui Xu,Chong Cheng,Changsheng Zhao
Transition metal oxide-based catalysts are known as the most active oxygen evolution reaction (OER) catalysts due to their intrinsic electronic structures and binding strength of oxygenated intermediates. However, even the most active transition metal oxide-based OER catalysts have a turnover frequency far lower than that of the oxygen-evolving complexes in biological systems for intermolecular site aggregation. Herein, we implement the hybridization of a metal–organic framework and tungstic acid (WO3·xH2O-in-MIL-88) to achieve ordered FeNi site isolation at the molecular level and avoid intermolecular decomposition during the catalysis process. The optimized hybrid with 15% tungstic acid (15%-WO3·xH2O-in-MIL-88) achieves a much-enhanced OER activity and stability in terms of a low overpotential of 263 mV to reach a current density of 10 mA cm−2, a low Tafel slope of 39 mV dec−1, and long-term stability, which is much superior to that of the commercial RuO2 catalyst.
研究领域:
材料化学
·
电化学
·
催化化学
·
能源科学
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）