JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Kui Yin,Shanshan Zhang,Yuyang Sun,Hui Huang,Yafei Cheng,Fan Liao,Mingwang Shao
Hydrogen is considered as a promising energy source because of its high combustion heat and clean products. Among the various hydrogen evolution methods, electrocatalysis is the most convenient and effective way. However it is still problematic to find low-cost and high-efficiency electrocatalysts. In this work, Os-Ag-Si and Os-Au-Si ternary electrocatalysts were investigated. It is interesting that Os-Ag-Si exhibits higher hydrogen evolution performance than that of Os-Au-Si, even though Ag is a worse HER catalyst than Au. The optimal ternary catalyst Os-Ag-Si with mass ratio of 15:15:70 (Os:Ag:Si) was synthesized by a facile Si H bond reduction method, which shows superior hydrogen evolution reaction performance with a low Tafel slope of 40 mV·dec −1 . In addition, the current density of Os-Ag-Si-15 catalyst surpasses that of 20% Pt/C when the overpotential is larger than 160 mV. The introduction of Ag in the Os-Ag-Si ternary catalyst could enhance the electrocatalytic activity, reduce the cost of catalysts, and even be better than Os-Au-Si.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 38
·26528-26543
·
IF 3.9
Asma Zaka,Muhammad Waqas Iqbal,Amir Muhammad Afzal,Haseebul Hassan,Hira Rafique,Saikh Mohammad Wabaidur,Ahmed M. Tawfeek,Eshan Elahi
In this work, a novel bimetallic Fe–Mg/MOF was synthesized through a cost-effective and rapid hydrothermal process. The structure, morphology, and composition were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy. Further, the Brunauer–Emmett–Teller (BET) measurement showed a 324 m2 g−1 surface area for Fe–Mg/MOF. The Fe–Mg/MOF achieved 1825 C g−1 capacity at 1.2 A g−1 current density, which is higher than simple Fe-MOF (1144 C g−1) and Mg-MOF (1401 C g−1). To assess the long-term stability of the asymmetric device, the bimetallic MOF supercapattery underwent 1000 charge/discharge cycles and retained 85% of its initial capacity. The energy and power densities were calculated to be 57 W h kg−1 and 2393 W kg−1, respectively. Additionally, Fe–Mg/MOF showed superior electrocatalytic performance in hydrogen evolution reaction (HER) by demonstrating a smaller Tafel slope of 51.43 mV dec−1. Our research lays the foundation for enhancing the efficiency of energy storage technologies, paving the way for more sustainable and robust energy solutions.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Xiaopei Li,Xianxu Chu,Kefan Ying,Xi Chen,Peng Sun,Haiyun Xu,Lu Li,Jie Zhang,Wenjuan Li
The five novel nickel organic complexes featuring different electron-rich and electron-deficient groups were synthesized as electrocatalysts by using N-(aryl/alkyl)-2-isonicotinoylhydrazine-1-carbothioamide compounds in coordination with nickel acetate tetrahydrate and 1,10-phenanthroline. These Ni-complexes were characterized using infrared and Raman spectroscopy and were subsequently employed for the oxygen evolution reaction (OER) in water splitting under alkaline conditions. The overpotential and Tafel slope for Ni-based complex Ni-1 were as low as 454 mV and 111.90 mV dec-1, respectively, at a current density of 10 mA cm-2, indicating excellent electrochemical performance. Furthermore, Ni-1 demonstrated good electrochemical stability, with only minor voltage fluctuations observed during the continuous bubble generation over a 40 hours electrolysis period and nickel maintains a +2 oxidation state (Ni2+) in the complex both before and after the OER test via characterization of N2p spectra by X-ray photoelectron spectroscopy (XPS) measurements. This study confirms the electronic effect of substituent groups on the water-splitting ability of Ni-complexes bearing the two different organic ligands, showing that the overpotential and Tafel slope increase with a decrease in the electron-donating capacity of the substituent groups.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 24
·9574-9582
·
IF 3.069
Jiamin Zhou,Gang Xu,Zewu Zhang,Hongyong Wang
The rational design and preparation of low-cost and high-performance electrocatalysts are critical for hydrogen production. Herein, a novel Cu2MoS4/MWCNT electrocatalyst was synthesized by utilizing a facile and environmentally friendly solvothermal method. The as-obtained Cu2MoS4/MWCNTs could act as a high-efficiency electrocatalyst for hydrogen evolution reaction (HER) with a small Tafel slope of 48 mV dec−1 and a low overpotential of 247 mV at a current density of 10 mA cm−2. The high HER performance of Cu2MoS4/MWCNTs could be attributed to their large electrochemical surface area (ECSA), their unique conductive structure and the strong interfacial interaction between Cu2MoS4 and MWCNTs.
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
·
2017
·Vol. 5
·期 35
·18627-18633
·
IF 8.867
Dazhong Zhong,Lin Liu,Dandan Li,Congcong Wei,Qiang Wang,Genyan Hao,Qiang Zhao,Jinping Li
Electrocatalytic water splitting is one of the most promising routes for large-scale hydrogen production. However, it is hindered by the complex oxygen evolution reaction (OER) with sluggish kinetics. NiFe-based catalysts, which are known for their high activity, durability, and low-cost, have been a “hot topic” in research on OER catalysts. Increasing numbers of reports have indicated that Fe sites provide active centers. Meanwhile, Fe is considered as the cheapest and one of the most abundant transition-metal elements. Herein, we report a facile and fast method to prepare iron–phosphate films supported on a nickel foam scaffold (Fe–Pi/NF), with exposed Fe sites at the surface. Fe–Pi/NF exhibited outstanding activity for the OER, requiring low overpotentials of 215 and 257 mV to drive current densities of 10 and 100 mA cm−2, respectively, in 1 M KOH solution. The TOF was as high as 0.381 s−1 at an overpotential of 270 mV. The Tafel slope was as low as 28 mV dec−1 between current densities of around 30 to 125 mA cm−2. It also exhibited excellent durability during a 90 h stability test, and the calculated faradaic efficiency was close to 96%. For comparison, Fe(OH)3/NF electrodes were also prepared. The results showed the OER activity of Fe–Pi/NF to be superior to those of Fe(OH)3/NF. The incorporation of electronegative phosphate groups results in the great hydrophilicity of Fe–Pi/NF and effectively adjusts the electronic structure of Fe3+ and facilitates the oxidation of Fe3+ to Fe4+.
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 ENERGY RESEARCH
·
2023
·
IF 4.6
Yuping Gai,Junbo Hu,Wei Deng,Wenshuo Xie,Xiang Li,Jingjing Zhang,Dewu Long,Shanlin Qiao,Fei Jiang
Summary. Electrochemical water decomposition as a crucial approach for the gradual growth of renewable energy has attracted extensive attention. Metal-organic frameworks (MOFs) which benefit from ultra-high specific surface area, controllable nanostructures, and excellent porosity have been widely used as high activity catalyst for the decomposition of water by electrochemical means. Herein, the composition and morphology of metal–organic framework nanoclusters with bimetallic Co/Fe-incorporated PTA/FDA nanoclusters is designed for efficient and durable OER electrocatalysts, including CoFe-BTC/PTA, CoFe-BTC/FDA, and CoFe-PTA/FDA. The crystal structure of MOF materials is composed of alternating organic hydrocarbon BTC, PTA, or FDA and inorganic metal oxide layer. Co and Fe interact as central atoms, joining BTC, PTA, or FDA ligands to form a highly symmetric MOF structure. The electronic structures and active sites of various metals are different, and the insertion of iron atoms plays a certain role in the regulation of their electronic structures. CoFe-PTA/FDA shows significant OER overpotential (1.525 V vs. RHE) reached 10 mA cm-2, with 62.85 mV dec-1 for Tafel slope and pretty conspicuous stability (72 hours of continuous testing). The DFT calculation results show coordination unsaturated metal atom is the primary active center of these electrocatalytic reaction, and the coupling effect caused by adding Fe is the key to adjust the electrocatalytic activity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 22
·13639-13644
·
IF 4.036
Jiyu Li,Zeyan Wang,Peng Wang,Zhaoke Zheng,Yuanyuan Liu,Hefeng Cheng,Baibiao Huang
In this study, a novel NiCoP–CeO2 composite was constructed on a Ni foam by a simple hydrothermal method and thermal phosphating strategy. In the OER test, NiCoP–CeO2 exhibited a low overpotential of 217 mV at 10 mA cm−2, 45 mV dec−1 of Tafel slopes. With the help of theoretical calculations and experimental characterization, the reason for performance improvement was analyzed in depth. The results show that CeO2 leads to a confinement effect, maintaining the nanosheet morphology of NiCo-LDHs, which contributes to sustaining the catalyst in favourable contact with H2O and minimizing the OER potential. Furthermore, by loading CeO2 onto NiCoP, the hydrophilicity of the catalyst is significantly enhanced. Our work provides an ingenious synthesis strategy for the preparation of efficient and inexpensive electrocatalytic materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 52
·2305343
·
IF 13.3
Yingxiu Zhao,Qiyan Sun,Xinyuan Zhou,Zhiyao Duan,Chuanfang Zhang,Guang-Rui Xu,Dianxing Ju,Lei Wang
Design high-loading with superior activity and high atomic efficiency has consistently been a new frontier of heterogeneous catalysis while challenging in synthetic technology. In this work, a universal solid-state strategy is proposed for large scalable production of high-loading Ir clusters on porous hollow carbon nanobowls (Ir CSs/PHCNBs). The strong electronic interaction between metallic Ir cluster and C on PHCNBs leads to electron redistribution, which significantly improves the electron transfer rate on the interface. The obtained Ir CSs/PHCNBs only require overpotentials of 35, 34, and 37 mV for the hydrogen evolution reaction (HER) with stable outputting of 10 mA cm −2 under acidic, alkaline, and neutral conditions, respectively, which exceeds the state-of-the-art HER electrocatalysts. Meanwhile, the Tafel slopes of Ir CSs/PHCNBs for the HER process are 23.07, 48.76, and 28.95 mV dec −1 , greatly lower than that of PHCNBs (152.73, 227.96, and 140.29 mV dec −1 ) and commercial Pt/C (20%) (36.33, 66.10, and 36.61 mV dec −1 ). These results provide a new strategy for the universal synthesis of clusters catalysts and insight into understanding the interface effects between clusters and carbon substrate, facilitating the industrial application of hydrogen production.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Hongtao Ren,Wence Xu,Shengli Zhu,Zhenduo Cui,Xianjin Yang,Akihisa Inoue
Nanoporous CuS and Ag 2 S/CuS composite are synthesized by chemical dealloying method. The Ag 2 S content of the composite catalysts is controlled by Ag atom in the original amorphous alloys. The composite catalysts reveal an good activity for hydrogen evolution reaction (HER) with a small potential of ∼0.2 V when current density is 10 mA cm −2 and a high current density of 163.4 mA cm −2 at 400 mV overpotential, which is associated with the enriched active sites on CuS and the improved electrical conductivity by Ag 2 S. The Tafel slope of Ag 2 S/CuS (75 mV dec −1 ) indicates that the combination of VH (Volmer-Heyrovsky) and VT (Volmer-Tafel) mechanisms might be involved to produce molecular hydrogen over Ag 2 S/CuS catalysts and the rate-determining step is likely some other than purely Heyrovsky or Tafel step. In addition, the composites exhibit good durability in acidic electrolytes and this method would open up a new type of highly efficient electrocatalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Yiyi Wu,Muhammad Tariq,Waqas Qamar Zaman,Wei Sun,Zhenhua Zhou,Ji Yang
Synthesizing oxygen evolution reaction (OER) catalysts with enhanced activity by codoping has been proven to be a feasible approach for the efficient use of noble metals via renewing their basic intrinsic properties. In continuation of the research in codoping, we prepare a ruthenium-based bimetallic doped catalyst MnxFeyRu1–x–yO2 with an outstanding OER activity as compared to pure RuO2, one of the state-of-the-art OER catalysts. The synthesized codoped RuO2 with a Mn/Fe molar ratio of 1 reflected a Tafel slope of only 41 mV dec–1, which is appreciably lower than 64 mV dec–1 for pure RuO2. The X-ray photoelectron spectroscopy (XPS) performed reveals that oxygen vacancy and manganese valency are the key factors of the OER activity for codoped 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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Sana Nazeer,Syed Ejaz Hussain,Junjie Qi
Semiconducting 2H-phase MoS 2 often performs poorly in the hydrogen evolution process and has low conductivity. Se increases stability, electrical conductivity, and catalytic activity when added to MoS 2 . Using carbon cloth as the substrate and several sulfur sources, such as Thioacetamide, L-cysteine, and Thiourea, this study developed an effective hydrothermal synthesis process to produce a MoS 2(1-x) Se 2x ternary alloy. When used as an electrocatalyst for HER, the TAA-MoSSe/CC alloy with an S/Se balance of 1:1 reaches at overpotential of 120 mV at the conventional current density of about 10 mA/cm 2 , whereas the observed Tafel slope value is 41 mV/dec. Furthermore, the strength of the Ternary alloys covered by the present investigation is enhanced by testing for air stability and durability. According to the characteristics of these ternary alloys, the creation of MoS 2(1-x) Se 2x depends critically on the temperature at which the sulfur precursor decomposes. Improved HER catalytic performance results from the rapid release of sulfur ions from sulfur precursors, which decompose at lower temperatures. These sulfur ions replace more Se ions in MoS 2(1-x) Se 2x .
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源催化
·
无机功能材料
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·4790-4796
·
IF 9.5
Nan Jue,Ye Beirong,He Xun,Li Chen,Zhang Wanli,Liu Qian,Li Luming,Chu Wei,Sun Xuping,Zhang Yongqi
Advancing efficient and affordable electrocatalysts to boost the oxygen evolution reaction (OER) is pivotal for sustainable green hydrogen production. Herein, we propose the fabrication of nickel-iron alloy nanoparticles-encapsulated on N-doped vertically aligned graphene array on carbon cloth (NiFe@NVG/CC) as a highly active three-dimensional (3D) catalyst electrode for OER. In 1 M KOH, such NiFe@NVG/CC demonstrates outstanding catalytic performance, necessitating merely overpotential of 245 mV for achieving a current density of 10 mA·cm −2 , a remarkably low Tafel slope of 36.2 mV·dec −1 . Furthermore, density functional theory calculations validate that the incorporate of N species into graphene can reinforce the electrocatalytic activity though reducing the reaction energy barrier during the conversion of ⋆ O to ⋆ OOH intermediates. The outstanding performance and structural benefits of NiFe@NVG/CC offer valuable insights for the development of innovative and efficient electrocatalysts for water oxidation.
研究领域:
电化学
·
材料科学
·
纳米技术
·
能量转换
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）