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000627888 1001_ $$0P:(DE-H253)PIP1101114$$aYoon, Aram$$b0
000627888 245__ $$aRevealing catalyst restructuring and composition during nitrate electroreduction through correlated operando microscopy and spectroscopy
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000627888 520__ $$aElectrocatalysts alter their structure and composition during reaction, which can in turn create new active/selective phases. Identifying these changes is crucial for determining how morphology controls catalytic properties but the mechanisms by which operating conditions shape the catalyst’s working state are not yet fully understood. In this study, we show using correlated operando microscopy and spectroscopy that as well-defined Cu$_2$O cubes evolve under electrochemical nitrate reduction reaction conditions, distinct catalyst motifs are formed depending on the applied potential and the chemical environment. By further matching the timescales of morphological changes observed via electrochemical liquid cell transmission electron microscopy with time-resolved chemical state information obtained from operando transmission soft X-ray microscopy, hard X-ray absorption spectroscopy and Raman spectroscopy, we reveal that Cu2O can be kinetically stabilized alongside metallic copper for extended durations under moderately reductive conditions due to surface hydroxide formation. Finally, we rationalize how the interaction between the electrolyte and the catalyst influences the ammonia selectivity. 
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000627888 7001_ $$0P:(DE-H253)PIP1112366$$aBai, Lichen$$b1
000627888 7001_ $$aYang, Fengli$$b2
000627888 7001_ $$aFranco, Federico$$b3
000627888 7001_ $$0P:(DE-H253)PIP1102532$$aZhan, Chao$$b4
000627888 7001_ $$0P:(DE-H253)PIP1097046$$aRüscher, Martina$$b5
000627888 7001_ $$0P:(DE-H253)PIP1011123$$aTimoshenko, Janis$$b6
000627888 7001_ $$aPratsch, Christoph$$b7
000627888 7001_ $$00000-0002-9041-1967$$aWerner, Stephan$$b8
000627888 7001_ $$0P:(DE-H253)PIP1031960$$aJeon, Hyo Sang$$b9
000627888 7001_ $$aMonteiro, Mariana Cecilio de Oliveira$$b10
000627888 7001_ $$00000-0003-0095-3242$$aChee, See Wee$$b11$$eCorresponding author
000627888 7001_ $$0P:(DE-H253)PIP1028930$$aRoldan Cuenya, Beatriz$$b12$$eCorresponding author
000627888 773__ $$0PERI:(DE-600)2088679-2$$a10.1038/s41563-024-02084-8$$gVol. 24, no. 5, p. 762 - 769$$n5$$p762 - 769$$tNature materials$$v24$$x1476-1122$$y2025
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