氢气作为一种安全,清洁且热值高的能源而备受关注。通过电解水阴极析氢反应(HER)的“绿氢”制备法是代替传统化石燃料的工业制氢的良好途径。本文将金属有机骨架ZIF-67和MIL-88复合成ZIF-67@MIL-88A后磷化,制备具有特殊结构形貌的CoP@Fe...氢气作为一种安全,清洁且热值高的能源而备受关注。通过电解水阴极析氢反应(HER)的“绿氢”制备法是代替传统化石燃料的工业制氢的良好途径。本文将金属有机骨架ZIF-67和MIL-88复合成ZIF-67@MIL-88A后磷化,制备具有特殊结构形貌的CoP@FeP异质结材料。通过扫描电子显微镜(SEM),X射线衍射(XRD)对CoP@FeP异质结复合材料进行物理表征。此外,还通过线性扫描伏安法(LSV),循环伏安法(CV),电化学阻抗谱(EIS),等电化学方法研究了该材料在碱性条件下的HER性能。结果显示,与对比材料相比,CoP@FeP异质结修饰电极在电解水制氢时具有最好的电催化性能。该电极在碱性介质中具有较小的过电位、Tafel斜率、电化学阻抗以及良好的长期稳定性,较高的活性面积等良好的性能。将其应用在模拟海水中同样展现出优异的催化活性、稳定性,为海水氢气制备提供了新的方案。Hydrogen as a safe, clean and high calorific value energy source has attracted much attention. The “green hydrogen” preparation method through electrolytic water cathode is a good way to replace the traditional industrial hydrogen production method of fossil fuels. In this paper, metal-organic skeleton ZIF-67 and MIL-88 were phosphating to prepare the CoP@FeP material with special structural morphology. The CoP@FeP composite was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and other electrochemical methods were used to study the HER properties of the material under alkaline conditions. The results show that the CoP@FeP modified electrode has the best electrocatalytic performance for hydrogen production by water electrolysis with low overpotential, Tafel slope, electrochemical impedance, good long-term stability and high active area in alkaline medium. It also shows excellent catalytic activity and stability in seawater, which provides a new scheme for the preparation of hydrogen from seawater.展开更多
过氧化氢(H2O2)的检测在医学,环境等领域有着重要作用。然而,目前其常用的检测方法具有操作复杂,成本昂贵和灵敏度低等缺点,无法满足人们的需求。随着科学技术的进步,电化学法因具备检测限低、灵敏度高等特点被广泛运用于小分子的检测...过氧化氢(H2O2)的检测在医学,环境等领域有着重要作用。然而,目前其常用的检测方法具有操作复杂,成本昂贵和灵敏度低等缺点,无法满足人们的需求。随着科学技术的进步,电化学法因具备检测限低、灵敏度高等特点被广泛运用于小分子的检测。基于此,我们利用金属有机框架In-MIL-68(MOFs)的热解策略制备出In@CN材料,将其用于高灵敏性检测H2O2的电化学传感器中。通过循环伏安法(CV),电化学阻抗谱(EIS),计时库伦曲线(Q-t)和安培时间电流曲线(i-t)等电化学方法探究该电化学传感器的检测性能。此外,我们还通过扫描电子显微镜(SEM)对该材料(In@CN)进行物理表征,确定其表面形貌。通过X射线衍射仪(XRD)确定其元素组成。实验结果表明:In@CN参与构建的电化学传感器即In@CN/GCE相较于In2O3/GCE在检测H2O2方面具有更高的灵敏度和更好的导电性,对H2O2的电化学检测具有更强的响应信号。此外,实验结果也表明该传感器具有良好的抗干扰性与稳定性。本文为新型催化剂构建H2O2的电化学传感器提供了一定的参考价值。Developing an effective method for detecting hydrogen peroxide (H2O2) plays an important role in medicine, environment and other fields. However, the commonly detection platforms have the disadvantages of complex operation, high cost and low sensitivity. With the progress of science and technology, electrochemical methods due to the low detection limit and high sensitivity have been widely used in the detection of small molecules. In this work, the hexagonal structure In@CN was successfully fabricated by pyrolysis strategy from metal-organic frameworks In-MIL-68 (MOFs). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to investigate the morphology and compositions and phase. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), chronometric coulomb curve (Q-t) and ampere time current curve(i-t) were used to investigate the electrochemical responses. The results showed that the electrochemical sensor In@CN/GCE has higher sensitivity and better conductivity than In2O3/GCE. In addition, the In@CN/GCE also shows a good anti-interference and stability. This work provides a certain reference value for the construction of electrochemical sensors for the detection of H2O2.展开更多
文摘氢气作为一种安全,清洁且热值高的能源而备受关注。通过电解水阴极析氢反应(HER)的“绿氢”制备法是代替传统化石燃料的工业制氢的良好途径。本文将金属有机骨架ZIF-67和MIL-88复合成ZIF-67@MIL-88A后磷化,制备具有特殊结构形貌的CoP@FeP异质结材料。通过扫描电子显微镜(SEM),X射线衍射(XRD)对CoP@FeP异质结复合材料进行物理表征。此外,还通过线性扫描伏安法(LSV),循环伏安法(CV),电化学阻抗谱(EIS),等电化学方法研究了该材料在碱性条件下的HER性能。结果显示,与对比材料相比,CoP@FeP异质结修饰电极在电解水制氢时具有最好的电催化性能。该电极在碱性介质中具有较小的过电位、Tafel斜率、电化学阻抗以及良好的长期稳定性,较高的活性面积等良好的性能。将其应用在模拟海水中同样展现出优异的催化活性、稳定性,为海水氢气制备提供了新的方案。Hydrogen as a safe, clean and high calorific value energy source has attracted much attention. The “green hydrogen” preparation method through electrolytic water cathode is a good way to replace the traditional industrial hydrogen production method of fossil fuels. In this paper, metal-organic skeleton ZIF-67 and MIL-88 were phosphating to prepare the CoP@FeP material with special structural morphology. The CoP@FeP composite was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and other electrochemical methods were used to study the HER properties of the material under alkaline conditions. The results show that the CoP@FeP modified electrode has the best electrocatalytic performance for hydrogen production by water electrolysis with low overpotential, Tafel slope, electrochemical impedance, good long-term stability and high active area in alkaline medium. It also shows excellent catalytic activity and stability in seawater, which provides a new scheme for the preparation of hydrogen from seawater.
文摘过氧化氢(H2O2)的检测在医学,环境等领域有着重要作用。然而,目前其常用的检测方法具有操作复杂,成本昂贵和灵敏度低等缺点,无法满足人们的需求。随着科学技术的进步,电化学法因具备检测限低、灵敏度高等特点被广泛运用于小分子的检测。基于此,我们利用金属有机框架In-MIL-68(MOFs)的热解策略制备出In@CN材料,将其用于高灵敏性检测H2O2的电化学传感器中。通过循环伏安法(CV),电化学阻抗谱(EIS),计时库伦曲线(Q-t)和安培时间电流曲线(i-t)等电化学方法探究该电化学传感器的检测性能。此外,我们还通过扫描电子显微镜(SEM)对该材料(In@CN)进行物理表征,确定其表面形貌。通过X射线衍射仪(XRD)确定其元素组成。实验结果表明:In@CN参与构建的电化学传感器即In@CN/GCE相较于In2O3/GCE在检测H2O2方面具有更高的灵敏度和更好的导电性,对H2O2的电化学检测具有更强的响应信号。此外,实验结果也表明该传感器具有良好的抗干扰性与稳定性。本文为新型催化剂构建H2O2的电化学传感器提供了一定的参考价值。Developing an effective method for detecting hydrogen peroxide (H2O2) plays an important role in medicine, environment and other fields. However, the commonly detection platforms have the disadvantages of complex operation, high cost and low sensitivity. With the progress of science and technology, electrochemical methods due to the low detection limit and high sensitivity have been widely used in the detection of small molecules. In this work, the hexagonal structure In@CN was successfully fabricated by pyrolysis strategy from metal-organic frameworks In-MIL-68 (MOFs). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to investigate the morphology and compositions and phase. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), chronometric coulomb curve (Q-t) and ampere time current curve(i-t) were used to investigate the electrochemical responses. The results showed that the electrochemical sensor In@CN/GCE has higher sensitivity and better conductivity than In2O3/GCE. In addition, the In@CN/GCE also shows a good anti-interference and stability. This work provides a certain reference value for the construction of electrochemical sensors for the detection of H2O2.
