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Synthesis and catalytic activity of Ag nanoparticles dispersed on nitrogen-doped GOPx toward direct electrooxidation of formaldehyde
Journal of Electroanalytical Chemistry ( IF 4.1 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.jelechem.2017.12.058
Ammara Ejaz , Yuri Joo , Jun Chang Cho , Jae Min Choi , Jae Yun Kim , Sujin Lee , Seungwon Jeon

Abstract Silver nanoparticles (Ag NPs) were synthesized and dispersed on the electronically conductive and electrochemically accessible surface of a GOPx composite, which was then employed as a probe for formaldehyde (HCHO) oxidation. The surface nanostructure, crystallographic properties, and oxidation state of the metal present in the GOPx-Ag nanocomposite were investigated using high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. HCHO electrooxidation was evidenced by the appearance of a very well defined anodic peak with an onset potential of − 0.783 V, which is unique in the literature. The effect of various electroanalytical parameters like concentration, scan rate, and upper potential limit was investigated toward HCHO electrooxidation on GOPx-Ag catalyst. Amperometric study showed remarkable HCHO electrooxidation response with a wide linear range of 1 μM–70 mM, limit of detection (LOD) 0.167 μM, limit of quantification (LOQ) 0.556 μM and sensitivity of 35.74 μAmM− 1 cm− 2. The experimental results further indicated the long-term stability and practical feasibility of the GOPx-Ag catalyst, with excellent recoveries for HCHO oxidation. The remarkable catalytic efficiency and anti-poisoning properties were far superior to those of many previously reported HCHO sensors. The astonishing analytical performance of GOPx-Ag opens up a new path for fabricating promising HCHO sensors.

中文翻译:

分散在氮掺杂 GOPx 上的银纳米粒子的合成及其对甲醛直接电氧化的催化活性

摘要 银纳米颗粒 (Ag NPs) 被合成并分散在 GOPx 复合材料的电子导电和电化学可及表面上,然后用作甲醛 (HCHO) 氧化的探针。使用高分辨率透射电子显微镜 (HRTEM)、X 射线衍射 (XRD)、能量色散 X 射线光谱 (EDX) 研究了 GOPx-Ag 纳米复合材料中存在的金属的表面纳米结构、晶体学性质和氧化态, X 射线光电子能谱 (XPS) 和拉曼光谱。HCHO 电氧化的证据是一个非常明确的阳极峰的出现,起始电位为 - 0.783 V,这在文献中是独一无二的。各种电分析参数的影响,如浓度、扫描速率、研究了 GOPx-Ag 催化剂上 HCHO 电氧化的电位上限。安培研究显示出显着的 HCHO 电氧化响应,线性范围为 1 μM–70 mM,检测限 (LOD) 0.167 μM,定量限 (LOQ) 0.556 μM,灵敏度 35.74 μAmM− 1 cm− 2。 实验结果进一步表明 GOPx-Ag 催化剂的长期稳定性和实际可行性,对 HCHO 氧化具有出色的回收率。显着的催化效率和抗中毒性能远远优于许多先前报道的 HCHO 传感器。GOPx-Ag 惊人的分析性能为制造有前景的 HCHO 传感器开辟了一条新途径。安培研究显示出显着的 HCHO 电氧化响应,线性范围为 1 μM–70 mM,检测限 (LOD) 0.167 μM,定量限 (LOQ) 0.556 μM,灵敏度 35.74 μAmM− 1 cm− 2。 实验结果进一步表明 GOPx-Ag 催化剂的长期稳定性和实际可行性,对 HCHO 氧化具有出色的回收率。显着的催化效率和抗中毒性能远远优于许多先前报道的 HCHO 传感器。GOPx-Ag 惊人的分析性能为制造有前景的 HCHO 传感器开辟了一条新途径。安培研究显示出显着的 HCHO 电氧化响应,线性范围为 1 μM–70 mM,检测限 (LOD) 0.167 μM,定量限 (LOQ) 0.556 μM,灵敏度 35.74 μAmM− 1 cm− 2。 实验结果进一步表明 GOPx-Ag 催化剂的长期稳定性和实际可行性,对 HCHO 氧化具有出色的回收率。显着的催化效率和抗中毒性能远远优于许多先前报道的 HCHO 传感器。GOPx-Ag 惊人的分析性能为制造有前景的 HCHO 传感器开辟了一条新途径。实验结果进一步表明了 GOPx-Ag 催化剂的长期稳定性和实际可行性,对 HCHO 氧化具有优异的回收率。显着的催化效率和抗中毒性能远远优于许多先前报道的 HCHO 传感器。GOPx-Ag 惊人的分析性能为制造有前景的 HCHO 传感器开辟了一条新途径。实验结果进一步表明了 GOPx-Ag 催化剂的长期稳定性和实际可行性,对 HCHO 氧化具有优异的回收率。显着的催化效率和抗中毒性能远远优于许多先前报道的 HCHO 传感器。GOPx-Ag 惊人的分析性能为制造有前景的 HCHO 传感器开辟了一条新途径。
更新日期:2018-03-01
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