3/28/2021 0 Comments Pd Xps Peaks
Typically, 0.5 g Vulcan XC-72 was added to 20 mL aqueous solution containing 0.664 g CoCl 2. Then the mixed solution was stirred overnight followed by drying at 120C for 5 h.Show citation Amperometric Formaldehyde Sensor Based on a Pd Nanocrystal Modified CCo 2 P Electrode Huan Wang, 1 Yaodan Chi, 1, 2 Xiaohong Gao, 1 Sa Lv, 1 Xuefeng Chu, 1 Chao Wang, 1 Lu Zhou, 1 and Xiaotian Yang 1 1 Jilin Provincial Key Laboratory of Architectural Electricity Comprehensive Energy Saving, Department of Materials Science, Jilin Jianzhu University, Changchun 130118, China 2 College of Instrumentation Electrical Engineering, Jilin University, Changchun 130012, China Show more Academic Editor: C.R. Raj Received 20 Jun 2017 Revised 27 Sep 2017 Accepted 10 Oct 2017 Published 12 Nov 2017 Abstract Ultrafine Pd nanocrystals were grown on the cobalt phosphide (Co 2 P) decorated Vulcan XC-72 carbon (CCo 2 P), which is realized by first implementing the corresponding metal precursor and then the further chemical reduction process.The as-synthesized CCo 2 PPd composite was further constructed to form a gas permeable electrode.
This electrode can be applied for formaldehyde (HCHO) detection. The results demonstrate that the Co 2 P nanocrystal can significantly improve the sensing performance of the CCo 2 PPd electrode for catalytic oxidation of HCHO, which is considered to be attributed to the effective electron transfer from Co 2 P to Pd in the CCo 2 PPd composites. Furthermore, the assembled CCo 2 PPd sensor exhibits high sensitivity of 617 nAppm and good selectivity toward various interfering gases such as NO 2, NO, SO 2, CO 2, and CO. ![]() Therefore, the proposed cost-effective CCo 2 PPd nanocomposite, which owns advantages such as high activity and good stability, has the potential to be applied as an effective electrocatalyst for amperometric HCHO detection. Introduction Formaldehyde, which is a colorless and toxic volatile organic compound (VOC), is an essential material that is applied in many aspects including the chemical factories and the residence decorating field. It is also well known that the formaldehyde can significantly increase the probability to get cancer for people 1. Therefore, the detection of formaldehyde gas is significantly important. Until now, numerous technologies have been employed, such as spectrophotometry 2, gas chromatography (GC) 3, high-performance liquid chromatography 4, ion chromatography 5, polarography 6, and integrated sensor 7. ![]() ![]() Generally, there are two types of formaldehyde gas sensor: semiconductors formaldehyde gas sensor based on metal oxide such as SnO 2 8, 9, ZnO 10, In 2 O 3 11, 12, and NiO 13 and (2) amperometric formaldehyde gas sensor made from noble metal nanomaterial, such as platinum or gold 14, 15. In contrast with semiconductor gas sensor, the amperometric formaldehyde gas sensors have numerous advantages such as lower power consumption, excellent linear response, high sensitivity, and reasonable selectivity at room temperature. Due to their high catalytic activity and excellent chemical stability, Pt-based catalysts are generally used in amperometric gas sensor. However, the scarcity and high cost of platinum greatly hinder its application. Much effort has been devoted to developing the platinum-free electrocatalysts, among which palladium-containing catalysts have been proven to be an effective candidate 16, 17. The CPd catalyst is a good choice, due to its low cost and competitive intrinsic electrocatalytic activity 18. Furthermore, it is reported that the addition of another element, such as Fe, Co, Ni, N, or P, can enhance the catalytic activity of the CPd catalyst 19 22. Unfortunately, the catalytic performance decreases rapidly by the dissolution or instability of the addition elements. It is well known that the transition metal phosphide nanoparticles such as Ni 2 P, CoP, and FeP can significantly improve the catalytic activity and stability of catalyst 23 25. But only a few works were reported about metal phosphide nanoparticles decorated PdC hybrids. In this work, an amperometric formaldehyde gas sensor was fabricated by using the CCo 2 PPd catalyst as active electrode in H 2 SO 4 electrolyte. Palladium chloride (99.9) was purchased from Tianjin Guangfu Chemicals Co., Ltd. Highly purified nitrogen (99.99) and oxygen (99.99) were supplied by Changchun Juyang Co., Ltd. Formaldehyde, nitric oxide, nitrogen dioxide, sulfur dioxide, ammonia, and carbon monoxide were supplied by Dalian Special Gases Co., Ltd. Preparation of Co 2 P Modified PdC Composites Pd modified CCo 2 P composite was synthesized by solid phase reaction and ethylene glycol reduction according to a reported method 18, 23, 26, 27 and the corresponding schematic illustration is shown in Figure 1. Typically, 0.5 g Vulcan XC-72 was added to 20 mL aqueous solution containing 0.664 g CoCl 2. Then the mixed solution was stirred overnight followed by drying at 120C for 5 h.
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