CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Long Zeng,Lu An,Zhijie Zhang,Jie Zheng,Wenxuan Chen,Chao Liu,Yuying Zheng,Dai Dang,Zhao-Qing Liu
Development of non-noble bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are of great significance under alkaline electrolytes for overall water splitting. In this work, CoP/FeP has been designed and constructed in situ on carbon fiber paper by using the bimetallic metal organic frameworks (MOFs) synthesis strategy. The heterogeneous CoP/FeP displays excellent catalytic activities in both HER and OER of the fully hydrolyzed semi-reaction. Remarkably, CoP/FeP is applied as the bifunctional electrode in anode and cathode to construct an overall water splitting apparatus, resulting in the low cell voltage and excellent stability. The exceptional electrocatalytic performance may be mainly attributed to the heterogeneous interface, which constructs a built-in electric field to provide electron to Co with electron-rich structure, resulting in the strong adsorption of H and weak adsorption of O 2 on Co. This study provides an effective and controllable method for the design of self-supporting bimetal phosphide 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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yanhui Song,Wenbo Sha,Meixiu Song,Peizhi Liu,Jiakang Tian,Hong Wei,Xiaodong Hao,Bingshe Xu,Junjie Guo,Jianguo Liang
Defect-rich metal-based nanomeshes have been regarded as potential effective catalysts for electrocatalytic water splitting, in which nanopores are beneficial to increase active sites and enhance the mass transfer. However, facile synthesis of metal-based nanomeshes still remains a great challenge. Herein, we report the cost-efficient ultrathin nickel molybdenum nanomeshes (NiMoO 4 ) for overall water splitting. The NiMoO 4 possesses outstanding oxygen evolution reaction property (239 mV@10 mA cm −2 ), together with an exceptional cycling stability. Notably, phosphorus (P)-doping endows the NiMoO 4 nanomeshes a superior hydrogen evolution reaction property (144 mV@−10 mA cm −2 ). We also prepare a double electrode system with NiMoO 4 and P-doped NiMoO 4 , and evaluate the performance of overall water splitting (1.68 V @10 mA cm −2 ). The key point of the processing route developed here is the synergistic effect between defect engineering and element doping, which provide a guiding insight for the development of novel catalysts for their practical applications.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Lincai Wang,Mingshen Zhong,Jiaxuan Li,Xiangshen Zhao,Weiju Hao,Yanhui Guo
Low cost and effective transition metal based catalysts are critical to the development of hydrogen generation techniques. In this paper, a multifunctional nanosized Co B O material has been developed that can act as highly active catalyst for both hydrolytic and electrolytic hydrogen production , affording a hydrogen generation rate of 7.45 L min −1 g −1 for hydrolysis of sodium borohydride (NaBH 4 ), and 10 mA cm −2 water-splitting current at overpotentials of 270 mV and 305 mV for hydrogen and oxygen evolution reaction in 1.0 M KOH. Meanwhile, oxygen doping is found to be critical to the activity of Co B O catalyst. This work will benefit the rational design of metal boride based material as highly active hydrolysis and electrolysis catalyst for hydrogen generation.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Energy Research
·
2021
·
IF 4.008
Li Jiayi,Zhou Wei,Huang Yuming,Gao Jihui
Replacing the oxygen evolution reaction (OER), which is of high energy consumption and slow kinetics, with the more thermodynamically favorable reaction at the anode can reduce the electricity consumption for hydrogen production. Here we developed a lignin-assisted water electrolysis (LAWE) process by using Ti/PbO2 with high OER overpotential as the anode aimed at decreasing the energy consumption for hydrogen production. The influence of key operating parameters such as temperature and lignin concentration on hydrogen production was analyzed. Compared with alkaline water electrolysis (AWE), the anode potential can be decreased from 0.773 to 0.303 (V vs. Hg/HgO) at 10 mA/cm2 in LAWE, and the corresponding cell voltage can be reduced by 546 mV. With increasing the temperature and lignin concentration, current density and H2 production rate were efficiently promoted. Furthermore, the anode deactivation was investigated by analyzing the linear sweep voltammetry (LSV) and cyclic voltammetry (CV) tests. Results showed that the anode deactivation was affected by the temperature.
研究领域:
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7617
·
IF 4.927
Xiaodong Fang,Xiangguo Wang,Ling Ouyang,Longcheng Zhang,Shengjun Sun,Yimei Liang,Yongsong Luo,Dongdong Zheng,Tairan Kang,Qian Liu,Feng Huo,Xuping Sun
The development of efficient electrochemical seawater splitting catalysts for large-scale hydrogen production is of great importance. In this work, we report an amorphous Co-Mo-B film on Ni foam (Co-Mo-B/NF) via a facile one-step electrodeposition process. Such amorphous Co-Mo-B/NF possesses superior activity with a small overpotential of 199 mV at 100 mA cm−2for a hydrogen evolution reaction in alkaline seawater. Notably, Co-Mo-B/NF also maintains excellent stability for at least 24 h under alkaline seawater electrolysis.Keywords:amorphous Co-Mo-B film;alkaline seawater electrolysis;hydrogen evolution reaction
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jue Wang,Zhi Li,Libei Feng,Dachun Lu,Wei Fang,Qinfang Zhang,Daniel Hedman,Shengfu Tong
The development of efficient and stable catalysts for oxygen evolution reaction (OER) in seawater presents a major challenge for hydrogen production through water electrolysis. In this work, we present a stable NiFe foam catalyst with a Se-doped Ni/Fe oxide surface prepared through a combination of chemical vapor deposition and electrochemical exfoliation. This method effectively modifies the surface of the commercial NiFe foam to a rough and stable Se-doped Ni/Fe oxide surface, displaying exceptional OER performance in both freshwater and seawater with more than 54 days stability in natural seawater. Characterizations reveal Ni-Se doped Fe oxide surface, with subsurface layers consisting of Ni alloyed with a moderate concentration of Fe, optimizes the adsorption free energy of oxygen-containing intermediates. Our results demonstrate a surface engineering approach to activate NiFe foam as a robust OER catalyst for seawater electrolysis, which is beneficial for the hydrogen economy and for the environment.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shukai Diao,Tianwen Wang,Wen Kuang,Su Yan,Xiaotian Zhang,Mingxuan Chen,Ying Liu,Aidong Tan,Tianrang Yang,Jianguo Liu
Alkaline water electrolysis (AWE) is a leading “green hydrogen” production technology. Industrial electrodes use alkaline leaching to remove Al from NiAl alloy, creating pores and increasing specific surface area (SSA) but still suffer from poor electrode performance. This study presents a method for fabricating an efficient bifunctional electrode. The process involves creating a porous Ni layer with high SSA on nickel mesh (NM) by reducing NiO, which facilitates the formation of Ni(OH) 2 nanosheets. The resulting Ni/Ni(OH) 2 @NM electrode features a hydrophilic, gas-repellent and highly electrochemically active surface. It achieves low overpotentials for hydrogen and oxygen evolution reactions (164 mV and 337 mV at 100 mA/cm 2 , respectively). The electrolyzer using Ni/Ni(OH) 2 @NM electrodes only requires 1.695 V to achieve 300 mA/cm 2 at 80 °C after a 2000 h durability test. The electrode also demonstrates excellent stability under frequent start-stop cycles, making it well-suited for integration with intermittent renewable energy sources.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yunyong Tang,Wen Song,Miao Guo,Guofeng Yang,Kunmei Su,Maliang Zhang,Zhenhuan Li
The separator plays a crucial role in alkaline water electrolysis (AWE) by conducting hydroxide ions and separating gases. Therefore, developing a high-performance AWE separator is of significant importance. This study proposes a method for preparing a hydrophilic polyphenylene sulfide (PPS) fabric separator. Firstly, PPS fabric separator undergoes a chloromethylation reaction to graft chloromethyl groups onto its surface, increasing its reactivity. Subsequently, chemical grafting introduces imidazole groups and quaternary ammonium groups to improve hydrophilicity. The modified PPS separator can rapidly conduct hydroxide ions and facilitate gas separation in alkaline solutions. Experimental results show that the modified PPS separator exhibits an area resistance of 0.219 Ω cm 2 in 30 wt % KOH solution at 80 °C, which is a 74.86 % reduction compared to the unmodified separator. Additionally, the bubble point pressure is enhanced by 2.46 %. During alkaline electrolysis experiments in a custom zero-gap electrolyzer, the modified separator demonstrates a current density of 493 mA cm −2 at a voltage of 2 V and maintains the stable performance after 500 h of operation, indicating the excellent electrolytic stability. This study provides a feasible reference for the industrial production of low-resistance, high gas-tightness AWE hydrogen production separators.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Jiaojiao Chen,Yu Chen,Ke Bai,Jingyun Liu,Zewei Bao,Zeyi Xiao,Senqing Fan
To enhance mass transfer in hydrogen production from water electrolysis coupled with ethanol oxidation, a membrane electrolyzer combining flow-through and fed-batch operation was developed. The optimized Co 0.1 Ni 0.9 (OH) 2 /Ni foam electrode was used for ethanol oxidation, with a current density of 200 mA cm −2 at 1.383 V vs. RHE and a Tafel slope of 39.5 mV dec -1 . Employing this electrode as the anode, the mass transfer coefficient ( k m ) in the flow-through electrolyzer was 7.0 × 10 -6 m s −1 under the conditions of electrolyte flow velocity at 0.06 m s −1 , ethanol concentration at 0.2 M and KOH concentration at 6 M, which was 49 % higher than that in the flow-by electrolyzer. This enhancement in k m directly translated to an increase in the mass transfer limiting current density ( i L , from 194 mA cm −2 to 289 mA cm −2 ), significantly higher reaction rate. Both k m and i L would be increased with the increase of electrolyte circulation rates. An analysis of the relationship between intrinsic electrochemical current density and i L showed that the ethanol oxidation process is maintained at or near the i L , which improved current efficiency and product yield. A fed-batch strategy, regulating ethanol concentration around 0.2 M, enabled sustained co-production of acetic acid and hydrogen at current densities of 289 mA cm −2 , with a production rate of 18.54mol h −1 m −2 (electrode) and 43.75 mol h −1 m −2 (electrode) respectively, with an anodic Faradaic efficiency of 92 %. The hydrogen production energy consumption was 3.85 kWh Nm −3 under this condition in flow-through electrolyzer.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Xiaomin Yan,Mingyang Zhou,Xiaofeng Gu,Xifen Gong,Jiang Liu
Hydrogen can be produced from reduction of water at the cathode of a solid oxide electrolysis cell (SOEC) and electricity and CO gas can be co-generated from the oxidation of carbon at the anode of a direct carbon solid oxide fuel cell (DC-SOFC). In the present work, a solid oxide cell (SOC) combining the cathode reaction of the SOEC and the anode reaction of the DC-SOFC is proposed, prepared, and investigated. It is demonstrated that hydrogen and CO can be separately produced from the cathode and anode through simultaneous reduction of water and oxidation of carbon in such a H 2 O-C SOC. Resistances from electrode polarizations are analyzed through measuring current-voltage characteristics, overpotentials, and AC impedances of the cell. The advantage of the H 2 O-C SOC over two separately operated SOEC and DC-SOFC is verified by the resistance analysis. An electrolyte-supported H 2 O-C SOC, with a cermet of silver and gadolinium-doped ceria (Ag-GDC) as the symmetrical electrode material and a steam concentration of 50 % at the cathode, gives an operating current density of 0.67 A cm -2 at the thermal neutral voltage (0.7 V). It stably operates at 0.2 A cm -2 under an applied voltage of only 0.16 V, producing pure hydrogen from the cathode and CO with a concentration of 88 % from the anode. The performance is significantly improved by using an anode-supported H 2 O-C SOC which gives an operating current density of 2.27 A cm -2 at the thermal neutral voltage.
研究领域:
能源科学
·
电化学
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Qing Wang,Chengxu Sun,Da Cui,Jingru Bai,Chunlei Wu,Shuang Wu,Jinghui Zhang
Carbon-assisted catalytic hydroelectrolysis (CAWE) has been demonstrated to significantly reduce energy consumption and enhance the economic viability of hydrogen production. In this study, BP oil shale was employed as an additive in a sulfuric acid environment for catalytic water electrolysis experiments. The results indicate a pronounced increase in current when the voltage reaches 1.42 V. Analysis reveals that iron ions (Fe 2+ /Fe 3+ ) play a dual role in facilitating charge transfer and mediating the redox cycle; however, their catalytic efficiency is constrained by the organo-mineral passivation layer that progressively forms on the surface of the oil shale. Utilizing a solid-liquid phase separation method, comparative analysis shows that the maximum current density of liquid-phase electrolysis reaches 8 mA, which is double that of solid-phase electrolysis. However, the current decays rapidly, and stability duration is reduced by 78 % compared to the solid-phase system. Gas chromatographic characterization of the anode products indicates a partial oxidation pathway involving intermediate hydrocarbons (CnHmXy), rather than corresponding gas formation. This study confirms that optimizing the iron regeneration pathway and inhibiting surface passivation are critical breakthroughs for promoting the engineering application of this technology. These findings provide basic insights into the catalytic hydroelectrolysis of oil shale for hydrogen production.
研究领域:
能源科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 23
·13562-13569
·
IF 12.732
Boran Wang,Mengjie Lu,Duo Chen,Qi Zhang,Wenwen Wang,Yutang Kang,Zhenxing Fang,Guangsheng Pang,Shouhua Feng
Self-supported nickel–iron nitride microsheet arrays coated with carbon are grown on commercial Ni foam (NixFeyN@C/NF) and used as an electrocatalyst for splitting of alkaline seawater. The porous architecture and superhydrophilic/superaerophobic surface ensure sufficient exposure of active sites and mass transfer. The synergetic coupling effect between the carbon coating and NixFeyN facilitates electron transport. The optimal anode (Ni3FeN@C/NF) and cathode (Ni3N@C/NF) electrocatalysts are employed to assemble a two-electrode seawater electrolyzer for overall alkaline seawater electrolysis, which delivers a large current density of 500 mA cm−2 at a low cell voltage of 1.91 V. The superior corrosion-resistance and electron conductivity of the electrocatalyst are responsible for its excellent durability up to 100 hours. This result suggests that transition-metal nitrides coated with carbon offer an effective route to fabricate high-performance and durable hybrid electrocatalysts for hydrogen production from seawater electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）