Pd/Attapulgite Core–Shell Structured Catalytic Combustion Gas Sensor for Highly Sensitive Real-Time Methane Detection
Year: 2025
Type: article
Abstract: Catalytic combustion gas sensors are critical for safety and environmental monitoring, yet face persistent challenges in sensitivity and detection limits amid expanding market demands. This study innovatively employs attapulgite as a support material functionalized with noble metal catalyst Pd to fabricate a low-cost, high-sensitivity sensor. Characterization (SEM/EDS) confirms a unique Pd/attapulgite core–shell structure with engineered Pd gradient distribution (7.5–75.8 wt% from core to surface). The sensor achieves methane catalytic combustion below 300 °C, delivering 0.7 µV/ppm sensitivity and ~36 ppm detection limit. Reaction kinetics follow the Eley–Rideal mechanism, with voltage difference (ΔU) versus methane concentration (C) conforming to the Langmuir equation (ΔU=Umax⋅K⋅C1+K⋅C, R2 > 0.99, Umax = 41.80 mV). Cost-effective fabrication and exceptional performance underscore its potential for practical deployment in industrial, residential, and environmental safety monitoring.
Source: Sensors
DOI: 10.3390/s25164950
Authors: Shuo Cao, Shuang Pang, Zishuai Zhang, Lulu Feng, Chong Zhang, Jiahao Lin, Zhiyu Liu, Yifei Sun, Shiyu Wang, Zhenning Lou
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
OpenAlex ID: W4413207474