Unraveling the dynamic redox behavior of Pd species in PdOx/SnO2 hybrids: A key to superior low-temperature gas sensing

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL Chemical Engineering Journal Pub Date : 2025-03-21 DOI:10.1016/j.cej.2025.161761

Jian Gao, Mengmeng Li, Shuge Jin, Meiyuan Guo, Suyu Jiang, Wei Ma, Chunshan Song

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引用次数: 0

Abstract

Operando characterization techniques reveal the dynamic interplay of Pd species and gas sensing activity in a PdO_x/SnO₂ hybrid material for low-temperature CO detection. We demonstrated that Pd species exhibited a dynamic redox behavior, transitioning between various oxidation states and serving as active sites for CO adsorption and subsequent spillover-mediated oxidation. The formation of a p-n junction at the PdO_x/SnO₂ interface drove oxygen anion (O₂^–, O^-) enrichment around Pd islands, enhancing CO adsorption and facilitating rapid CO₂ formation. This resulted in electron injection into the SnO₂ depletion layer, significantly enhancing the sensing response even at temperatures as low as 50 °C. Our findings provided profound insights into the dynamic behavior of Pd species and its influence on gas sensing performance, offering a valuable strategy for designing advanced low-temperature CO sensors with enhanced sensitivity, selectivity, and operational stability.

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.