# Materials with strong metal-oxide interaction (SMOSI) highly efficient for HOR and tolerant to the presence of CO

Koffi F. Bouho, Weliton Silva Fonseca, Thibault Rafaïdeen, Têko W. Napporn, Christophe Coutanceau

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Koffi F. Bouho, Weliton Silva Fonseca, Thibault Rafaïdeen, Têko W. Napporn, Christophe Coutanceau. Materials with strong metal-oxide interaction (SMOSI) highly efficient for HOR and tolerant to the presence of CO. 247th ECS Meeting, The Electrochemical Society, May 2025, Montréal, Canada. hal-05055517

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https://hal.science/hal-05055517v1

Submitted on 5 May 2025

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Distributed under a Creative Commons Attribution 4.0 International License
Materials with strong metal-oxide interaction (SMOSI) highly efficient
for HOR and tolerant to the presence of CO

Franck Koffi Bouho, Weliton Fonseca, Thibaut Rafaideen, Téko Napporn, Christophe Coutanceau

Institut de Chimie des Milieux et Matériaux de Poitiers, CNRS – Université de Poitiers

4 rue Michel Brunet, TSA 51106, 86073 Poitiers cedex 9, France

koffi.bouho@univ-poitiers.fr

Recently, research in heterogeneous catalysis has mainly focused on SMSI (strong metal
support interaction), aiming to enhance both the activity and stability between the metal and the
support [1, 2]. In particular the development of anode materials for the PEMFC, driven by the
increasing demand for clean and efficient energy suppliers. Approximately 90% of hydrogen
produced via thermochemical processes contains impurities such as CO, CO2, and H2 S, which
can significantly reduce the performance of PEMFC anode catalysts. Progress in this area is
pivotal for the commercialization of PEMFC systems in applications ranging from residential to
heavy-duty mobility.

To address this challenge, a novel synthesis strategy was employed to develop binary and ternary materials comprising tin oxide coupled with Pt and PtRu with different structures in order to promote SMOSI (Strong metal oxide support interaction) [3]. Tin oxide can be used as a support or co-catalyst to boost electrocatalytic performance. Physicochemical characterization methods such as XRD, TEM, and XPS were used to determine the crystallite size, degree of alloying, particle size and distribution, surface and electronic properties of the materials. The electrocatalytic activity was evaluated by cyclic voltammetry, polarization curve and CO stripping in both the absence and presence of a H2/0.1%CO gas mixture. The addition of tin oxide (SnO2) to Pt and PtRu reduced the onset potential by 2.8 and 2 times compared with Pt and PtRu catalysts respectively. Poisoning resistance tests monitored by chronoamperometry were also carried out at 20°C and 60°C and.

**Acknowledgements:** This work was performed in the framework of the PEMFC95 project funded by the 457 "France 2030" government investment plan managed by the French Research Agency, 458 under the reference "ANR-22-PEHY-0005".

**References**

1. Tu, Z., et al., *Enhanced radical scavenging performance of Pt@CeO2 via strong metal-support interaction effect for improving durability of proton exchange membrane fuel cell*. International Journal of Hydrogen Energy, 2024. **50**: p. 41-51.

2. Yin, P., et al., *Ultra-high-temperature strong metal-support interactions in carbon-supported catalysts*. Cell Reports Physical Science, 2022. **3**(8).

3. Yuan, L.-P., et al., *Molecularly Engineered Strong Metal Oxide–Support Interaction Enables Highly Efficient and Stable CO2 Electroreduction*. ACS Catalysis, 2020. **10**(22): p. 13227–13235.