Preparation，energy harvesting and self-powered sensing application of PDA/rGO hydrogel
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摘要: 传统的供电方式限制了可穿戴电子设备的快速发展，直接从周围环境中收集能量被认为是最有潜力的能源供给方式。利用多巴胺(DA)还原氧化石墨烯(GO)，通过水浴加热成功制备了聚多巴胺/还原氧化石墨烯(PDA/rGO)水凝胶。在流变性能分析中，观察到样品的储能模量G'明显大于其损耗模量G''，表明其具有凝胶态结构。对其溶胀性、粘附性和自愈性进行分析，发现制备的PDA/rGO水凝胶对水和NaCl溶液均有良好的溶胀性，其中对水的溶胀率高达900%，且PDA的存在赋予该水凝胶良好的自黏附性和自愈能力。进一步对其能量收集和自供电传感性能进行了研究，结果表明：NaCl溶液溶胀的PDA/rGO水凝胶在外加压力作用下，可以产生明显的电能输出，输出的电流和电压随着NaCl溶液浓度和外加压力的的增加而增大，在0.05 mol/L NaCl溶液环境下的10 g加压下，观察到平均输出电流和电压分别为0.40 μA和0.54 mV。此外，该水凝胶的电阻对外加压力的变化也显示出敏感的响应。这些结果证明了PDA/rGO水凝胶在能量收集和自供电传感领域中有着良好的应用潜力。Abstract: The traditional power supply methods have limited the rapid development of wearable electronic devices, and directly collecting energy from the surrounding environment is considered as the most promising way of energy supply. In this paper, polydopamine/reduced graphene oxide (PDA/rGO) hydrogel was successfully prepared by reducing graphene oxide (GO) with dopamine (DA) and water bath heating. In the rheological analysis, it is observed that the energy storage modulus (G') of the sample is significantly larger than its energy consumption modulus (G''), indicating a gel state structure. By analyzing its swelling behavior, adhesion, and self-healing properties, it is found that the prepared hydrogels exhibit good swelling behavior in both water and NaCl solution, with a swelling ratio of up to 900% in water. The presence of PDA enables the hydrogels to possess good self-adhesion and self-healing abilities. Further studies on its self-powered and sensing properties reveals that the PDA/rGO hydrogel swollen in NaCl solution can generate significant electrical output under external pressure, and the output current and voltage increases with the increase of NaCl solution concentration and external pressure. In an environment of a 0.05 mol/L NaCl solution subjected to a pressure of 10g, the mean output current and voltage measurements were recorded at 0.40 μA and 0.54 mV, respectively. Moreover, its resistance also showed a sensitive response to changes in external pressure. These results indicate that the PDA/rGO hydrogel has potential application in the fields of energy harvesting and self-powered sensing.
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Key words:
- Graphene oxide /
- Polydopamine /
- Hydrogel /
- Energy harvesting /
- Self-powered sensing
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图 1 原始氧化石墨烯纳米片(GO) (a,c)和多巴胺(DA)还原后的氧化石墨烯纳米片(b,d)的AFM图像以及对应的断面轮廓图
Figure 1. AFM images and the corresponding cross sectional profiles of the original graphene oxide (GO) (a,c) and GO nanosheets reduced by dopamine (DA) (b,d)
图 2 原始氧化石墨烯(a),反应时间分别为8 h(b)、10 h (b)和12 h (d) 的PDA/rGO水凝胶的SEM图
Figure 2. SEM images of the original GO (a) and PDA/rGO hydrogels after heating in a water bath for 8 h (b), 10 h(c) and 12 h (d)
图 3 氧化石墨烯和干燥PDA/rGO水凝胶的XRD(a)和拉曼光谱(b)
Figure 3. XRD (a) and Raman spectra (b) of GO and dried PDA/rGO hydrogels
图 4 PDA/rGO水凝胶的储能模量G'和损耗模量G''与角频率的关系
Figure 4. Relationship of energy storage modulus G' and energy consumption modulus G'' of PDA / rGO hydrogels to angular frequency
图 5 PDA/rGO水凝胶的溶胀比与溶胀时间的关系
Figure 5. Relationship of the swelling ratio of PDA/rGO hydrogels to immersion time
图 6 PDA/rGO-10水凝胶在玻璃基板(a)、铜片(b)、塑料基底(c)、木板(d)上的自粘附行为
Figure 6. Self-adhesive behavior of PDA/rGO-10 hydrogel on glass substrate (a), Copper substrate (b), plastic substrate (c), and Wood substrate (d)
图 7 自愈合前后的PDA/rGO-10水凝胶(a) 及切割前后的I-V曲线 (b)
Figure 7. PDA/rGO-10 h hydrogel before and after self-healing (a) and corresponding I-V curves before and after cutting (b)
图 9 PDA/rGO-10水凝胶在外加载荷为5 g (a)和10 g (b)时产生的输出电流曲线
Figure 9. Output current curves of PDA/rGO-10 hydrogel under the load of 5 g (a) and 10 g (b)
图 10 PDA/rGO-10水凝胶在外加载荷下的输出电流(a)和输出电压(b)随NaCl溶液浓度的变化关系
Figure 10. Relationship of the output current (a) and voltage (b) of PDA/rGO-10 hydrogel with the NaCl concentration
图 11 含不同浓度NaCl溶液PDA/rGO-10水凝胶的I-V曲线(a)以及其生电机制示意图(b)
Figure 11. I-V curves of PDA/rGO-10 hydrogel with different concentrations of NaCl solution(a) and scheme for generating electricity mechanism(b)
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