Gerhard Ertl: Pioneer of Surface Chemistry and 2007 Nobel Laureate

Overview of his contribution

Ertl's work clarified the sequence of microscopic events that control heterogeneous catalysis: adsorption of reactants, bond activation and cleavage, surface diffusion and rearrangement, and eventual desorption of products. By connecting surface atomic structure with reaction kinetics, his experiments allowed chemists and engineers to move beyond phenomenological descriptions and to test theoretical models under well defined conditions. This shift made it possible to explain, predict, and improve catalytic performance in both laboratory and industrial settings.

Key research areas and discoveries

• Hydrogen activation: Ertl and collaborators showed how molecular hydrogen dissociates at metal surfaces and how this elementary step influences subsequent surface reactions.
• Carbon monoxide oxidation: Detailed experimental studies of CO oxidation on platinum and other metals revealed reaction intermediates, oscillatory behavior, and propagating reaction fronts that illuminate non‑linear dynamics on surfaces.
• Surface structure–reactivity relations: His work demonstrated how terraces, steps and defects on crystalline surfaces change adsorption energies and reaction pathways.

Methods and experimental techniques

Ertl combined several surface‑sensitive methods that became standard in the field. These included low‑energy electron diffraction (LEED) to determine surface order, molecular beam techniques to study single‑collision interactions, thermal desorption spectroscopy to measure binding energies and reaction products, and a variety of spectroscopic probes to identify adsorbed species and intermediates. The careful preparation of clean, well characterized surfaces was essential to link observed kinetics to atomic‑scale structure.

Impact and practical applications

The implications of Ertl's work reach across energy conversion, environmental protection and material science. Understanding catalytic mechanisms underpins the design of more effective automotive catalytic converters that reduce harmful emissions and informs strategies for fuel cells that convert chemical energy with high efficiency and lower pollution. Surface reactions are also central to corrosion processes such as why iron rusts and to heterogeneous reactions in the atmosphere: for example, reactions that occur on the surfaces of tiny ice crystals can influence stratospheric chemistry and processes related to the ozone layer.

Career, honours and recognition

In addition to the Nobel Prize, Ertl received numerous international honours that recognized both his scientific discoveries and his role in establishing surface science as a rigorous experimental discipline. His publications, lectures and the students trained in his laboratories helped disseminate the experimental paradigm worldwide. Institutional profiles and research summaries provide context for his career and contributions (research profile).

Legacy and ongoing influence

Today Ertl's experimental approach—preparing controlled surfaces, combining complementary probes, and mapping reaction sequences—remains central to heterogeneous catalysis research. Modern developments couple his methods with advanced imaging, ultrafast spectroscopy and computational modelling to design catalysts with tailored activity and selectivity. Reviews and educational materials on surface chemistry and reaction mechanisms continue to cite Ertl's work as foundational reading, guiding both academic research and industrial innovation (surfaces overview).

Further reading

For accessible introductions and more detailed histories consult authoritative resources and institutional pages that archive Ertl's publications and career summaries (biographical notes, academic profile, institute information). General discussions of mechanisms and techniques useful for non‑specialist readers can be found in overviews of reaction mechanisms and practical summaries on environmental topics related to pollution control and energy applications such as fuel cells.