MOLECULES
·
2024
·Vol. 29
·期 5
·951
·
IF 4.2
Tingxia Wang,Xu Zhang,Xiaojiao Yu,Junpeng Li,Kai Wang,Jinfen Niu
A bifunctional electrocatalyst with high efficiency and low costs for overall water splitting is critical to achieving a green hydrogen economy and coping with the energy crisis. However, developing robust electrocatalysts still faces huge challenges, owing to unsatisfactory electron transfer and inherent activity. Herein, NiFe LDH/NiS2/VS2heterojunctions have been designed as freestanding bifunctional electrocatalysts to split water, exhibiting enhanced electron transfer and abundant catalytic sites. The optimum NiFe LDH/NiS2/VS2electrocatalyst exhibits a small overpotential of 380 mV at 10 mA cm−2for overall water splitting and superior electrocatalytic performance in both hydrogen and oxygen evolution reactions (HER/OER). Specifically, the electrocatalyst requires overpotentials of 76 and 286 mV at 10 mA cm−2for HER and OER, respectively, in alkaline electrolytes, which originate from the synergistic interaction among the facilitated electron transfer and increasingly exposed active sites due to the modulation of interfaces and construction of heterojunctions.
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
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jie Wang,Guicai Lv,Cheng Wang
Hydrogen production by electrochemical overall water splitting is considered as a clean and renewable approach for greener energy. However, the efficiency of water electrolysis suffers from the sluggish kinetics and high overpotential of OER. Although NiFe LDH is regarded as a promising OER catalyst, it faces the problem of poor conductivity, resulting in the limitations of HER performance. Herein, a hybrid nano-architecture of CoNiN@NiFe LDH as a bifunctional electrocatalyst for overall water splitting is fabricated via in-situ electrochemically assembling hierarchical NiFe LDH nanosheets on the surface of CoNiN. CoNiN@NiFe LDH shows excellent activities for OER with the overpotentials of 227 and 291 mV to deliver the current densities of 10 and 100 mA cm −2 , respectively. Moreover, an alkaline electrolyzer with CoNiN@NiFe LDH as anode and cathode requires a cell voltage of 1.63 V to achieve 10 mA cm −2 . In addition, the excellent stability with 100 h towards overall water splitting outperforms most transition metal-based bifunctional electrocatalysts. The superior performance is attributed to the abundant active sites, the strong electronic interaction, and the corresponding metal (oxy)hydroxides species generated by in situ surface reconstruction and phase transformation.
研究领域:
材料科学
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电化学
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能源转换
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13396-13408
·
IF 2.478
Zhao Guoqing,Zou Jiao,Liu Lukai,Hu Jun,Yu Jingang,Jiao Feipeng
Direct fixation of nitrogen (N 2 ) to ammonia (NH 3 ) under ambient conditions via photocatalysts is a promising method to relieve the pressure of energy shortage, where chemisorptions of torpid nitrogen and delivery of photoproduced electrons to N≡N bond are recognized technical limitations. In this work, we have developed the catalysts of NiFe-LDH-derived sulfides microspheres ([NiFe]S) with excellent photocatalytic activity for reduction of N 2 to NH 3 . Excitingly, the NH 3 generation rates of [NiFe]S catalysts reached up to 111.83 μmol · L −1 · h −1 under visible light irradiation in water, which were 10.35 times than that of NiFe-LDH microspheres. The reason was due to the higher photo-induced carrier separation and transmission efficiency of [NiFe]S microspheres. In addition, the possible photocatalytic mechanism was proposed. This new work could guide the design of efficient catalysts and open up the application of metal sulfides in photocatalytic N 2 fixation.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Li Wang,Junli Wang,Xuanbing Wang,Min Li,Jinlong Wei,Nianxiang Hu,Ruidong Xu,Linjing Yang
Low-cost and high-efficiency electrocatalysts produced by constructing the interfacial heterostructure have attracted more attention in oxygen evolution reaction (OER). Herein, we synthesize a three-dimensional (3D) heterogeneous structure of Ni x Co y Se 2 nanospheres loaded onto NiFe hydroxide (NiFe-LDH) nanosheets via bare nickel foam (NF) two-step electrodeposition. The optimal NiFe-LDH@Ni x Co y Se 2 /NF nanosheets heterojunction electrocatalyst is verified with an excellent OER performance in 1.0 M KOH solution, which only requires a low overpotential of 265.5 mV and 297.8 mV to drive high current density of 100 mA cm −2 and 500 mA cm −2 , respectively, long-term durability of more than 60 h at 100 mA cm −2 , and an extremely low Tafel slope of 57.5 mV dec −1 . Meanwhile, due to the dramatic improvement in OER performance, there is an enhancement in the overall water-splitting activity of the NiFe-LDH@Ni x Co y Se 2 /NF nanosheets heterojunction, attaining a current density of 20 mA cm −2 at the low cell voltage of 1.65 V. As a result, it shows the importance of constructing highly efficient OER catalyst with the rational design of heterostructures. The enhanced catalytic performance can be attributed to the large exposed electrocatalytic active sites accessible and constructed an efficient electronic transmission channel by eliminating contact resistance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 30
·2401694
·
IF 27.4
Yin Zhu,Yanxu Chen,Yafei Feng,Xiangmin Meng,Jing Xia,Genqiang Zhang
Hydrazine oxidation-assisted water splitting is a critical technology to tackle the high energy consumption in large-scale H 2 production. Ru-based electrocatalysts hold promise for synergetic hydrogen reduction (HER) and hydrazine oxidation (HzOR) catalysis but are hindered by excessive superficial adsorption of reactant intermediate. Herein, this work designs Ru cluster anchoring on NiFe-LDH (denoted as Ru c /NiFe-LDH), which effectively enhances the intermediate adsorption capacity of Ru by constructing Ru─O─Ni/Fe bridges. Notably, it achieves an industrial current density of 1 A cm −2 at an unprecedentedly low voltage of 0.43 V, saving 3.94 kWh m −3 H2 in energy, and exhibits remarkable stability over 120 h at a high current density of 5 A cm −2 . Advanced characterizations and theoretical calculation reveal that the presence of Ru─O─Ni/Fe bridges widens the d-band width (W d ) of the Ru cluster, leading to a lower d-band center and higher electron occupation on antibonding orbitals, thereby facilitating moderate adsorption energy and enhanced catalytic activity of Ru.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jinghao Hua,Sheng Feng,Changchang Ma,Haitao Huang,Kai Wei,Xiaojun Dai,Kaidi Wu,Haihong Wang,Zhaowei Bian
In this study, a novel 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst was prepared by combining NiFe-LDH with Bi 5 O 7 Br through self-assembly. Under simulated solar irradiation, compared with pure NiFe-LDH and Bi 5 O 7 Br, the 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst revealed a significant improvement in the efficiency of photocatalytic reduction of CO 2 . Z-scheme heterojunction promotes the separation of photo generated charge carriers and 2D/2D structure is conducive to exposing more active site and enhancing the migration rate of interface carriers. The photocatalytic activity experiment revealed that the CH 4 production efficiency of the Bi 5 O 7 Br/NiFe-LDH (37.77 μmol/g/h) after 8 h of light exposure was 2 times and 10 times that of Bi 5 O 7 Br (22.41 μmol/g/h) and NiFe-LDH (3.84 μmol/g/h), respectively. The successful formation of Z-scheme heterojunction was determined through band analysis and related characterization. The advantage of Z-scheme heterojunction is that it has high electron mobility and low resistivity. This work launches a feasible design strategy of special structure photocatalysts to enhance the photocatalytic activity for the CO 2 reduction.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Shouli Bai,Shiyu Jia,Yingying Zhao,Pinggui Tang,Yongjun Feng,Ruixian Luo,Dianqing Li,Aifan Chen
Ti-doped α-Fe2O3 nanorods were prepared by a facile hydrothermal method, followed by a NiFe-LDH catalyst that was electrodeposited on the doped α-Fe2O3 nanorods to structure an integrating photoanode Ti:Fe2O3/NiFe-LDH for improving solar PEC water-splitting efficiency. The structure and properties of electrode materials were characterized and the PEC properties of photoanodes were measured. The results show that the photocurrent density of the photoanode enhances 11.25 times at 1.23 V (vs RHE) and the IPCE value enhances 4.10 times at 420 nm compared with pristine α-Fe2O3. The enhancement is attributed to the separating of photogenerated electron–hole, the increase of carrier density, and the acceleration of the carrier transfer rate due to the dual action of doping and catalysis.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Fuwei Yang,Xilin Liu,Pengfei Liu,Jiayin Li,YiZhuo Wang,Jianrong Xue,Hu Zhou
In this work, a 2D-3D activator De@NiFe-LDH was constructed by in-situ growth of 2D NiFe layered double hydroxide (NiFe-LDH) on the surface of 3D diatomaceous earth (De). The analysis of SEM, XRD, FTIR, XPS and BET were used to characterize the samples. The as-prepared De@NiFe-LDH achieved 99.4 % removal of tetracycline hydrochloride (TC) via activation of peroxymonosulfate (PMS). Singlet oxygen ( 1 O 2 ) was verified as dominant reactive oxygen species responsible for TC removal via quenching tests. Mechanism investigation suggested that the redox cycles of Ni 2+ /Ni 3+ and Fe 2+ /Fe 3+ on the surface of De@NiFe-LDH were crucial for PMS activation. In addition, the reasonable reusability and versatility of De@NiFe-LDH as well as low-toxicity of treated water endowed the De@NiFe-LDH/PMS system with a wide range of applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiaoyu Lu,Congling Li,Li Zhang,Wei Xia,Rui Liu,Aifeng Lv
The rational design of efficient, cost-effective, and durable electrocatalysts is crucial for the realization of hydrogen production through water splitting. The present study describes the synthesis of a novel three-dimensional (3D) volcano-like Fe 3 S 4 /Ni 3 S 2 /WO 3 /NiFe LDH/NF (Layered Double Hydroxides/Nickel Foam) electrocatalyst with a highly wrinkled structure through a two-step hydrothermal method. The as-synthesized electrocatalyst exhibits an exceptionally low overpotential of 77 mV for the hydrogen evolution reaction (HER) and 131 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm −2 , owing to the unique morphology and strong electronic interactions between Fe 3 S 4 , Ni 3 S 2 and WO 3 heterostructures. The Fe 3 S 4 /Ni 3 S 2 /WO 3 /NiFe LDH/NF electrocatalyst demonstrates exceptional performance in overall water splitting when employed as both anode and cathode, achieving a current density of 10 mA cm −2 at an impressively low cell voltage of 1.5 V as well as exhibiting remarkable durability with little degradation over a period of 12 hours. This study presents a straightforward approach for the synthesis of highly efficient and durable non-noble metal catalysts for overall water splitting under hydrothermal conditions.
研究领域:
材料科学
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电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jing Wang,Min Wang,Zhenjiang Lu,Jing Xie,Jianguo Huang,Jindou Hu,Yali Cao
The inefficient Ni/Fe ion utilization and poor electrical conductivity of nickel-iron layered double hydroxide (NiFe-LDH) restricts to its development in electrocatalytic oxygen evolution reaction/urea oxidation reaction (OER/UOR). Herein, self-supported Hf-doped NiFe-LDH nanosheet arrays were successfully prepared on nickel foam (Hf-NiFe-LDH/NF) via a one-step solvothermal approach for the first time, in which the introduced high-valent Hf 4+ altered the structure of electrons and chemical environment of the atoms and promoted the production of more active sites, thus realizing the fast kinetics of electron transfer on the layer. Meanwhile, the doped metal Hf ions increased the electric conduction and recycling stability of the catalyst. Astoundingly, the overpotential of Hf-NiFe-LDH/NF is barely 258 mV at a current density of 100 mA cm −2 , which is 61 mV lower than that of NiFe-LDH/NF, as well as outstanding stability for over 90 h during the OER. Similarly, the potential is only 1.37 V at 100 mA cm −2 during the UOR, 118 mV less was than at OER. Notably, Hf-NiFe-LDH/NF electrocatalyst exceeds the most previously reported electrocatalysts in terms of performance. This study highlights the benefits of Hf doping strategy in electrocatalytic OER/UOR and presents a promising new type of catalyst for future research.
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 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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Akhmat Fauzi,Shuo Geng,Fenyang Tian,Yequn Liu,Haibo Li,Yongsheng Yu,Jiaming Li,Weiwei Yang
Interface engineering is an efficient strategy for synthesis of high efficiency catalysts which can combine the advantages of each part for improving the catalytic activity . Herein, we fabricate the heterostructure NiFe-LDH@Ni 3 S 2 by interface engineering through a simple hydrothermal combined with electrodeposition method. Combining the high conductivity of Ni 3 S 2 and high intrinsic OER activity of NiFe-LDH at the interface, the NiFe-LDH@Ni 3 S 2 electrode exhibits a relatively low overpotential of 240 mV for OER at a current density of 200 mA cm −2 which is lower than NiFe-LDH and Ni 3 S 2 . In addition, the overall water splitting unit provides a potential of 1.47 V at 10 mA cm −2 . Furthermore, after 24 h of electrolysis in 1.0 M KOH, the current density remains 98% of the original value. This work paves a new way for synthesis of more heterostructure catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）