We report a confined proton transportation in the CeO 2 /CeO 2−δ core−shell structure to build up proton shuttles, leading to a super proton conductivity of 0.16 S cm −1 for the electrolyte and advanced fuel cell performance, 697 mW cm −2 at 520 °C. The semiconductor nature of the CeO 2 (i-type) core and the CeO 2−δ (n-type) shell reveals a unique proton transport mechanism based on the charged layers formed at the interface of the CeO 2−δ /CeO 2 heterostructure. Two key factors of this structure confine proton transport to the particle surface. The first is the high concentration of oxygen vacancies in the surface layer, which benefits proton conduction. The second is a depletion region created by the core−shell interface that allows proton migration only on the surface layer rather than into the bulk CeO 2 . The constrained surface region of the CeO 2−δ builds up continuous proton shuttles. This work presents a new methodology and understanding for proton transport in general oxides and a new generation proton ceramic fuel cells.
Drawing on the motivation, opportunity and ability (MOA) framework, we investigate the influence of charismatic leadership on salespeople’s service and sales activities—termed service-sales ambidextrous (SSA) behavior, which subsequently turn into service recovery performance outcomes. The primary aim of this research is to strengthen salespeople’s service quality in parallel to their selling activities while recovering a service failure. We validate the model using a sample of 344 business-to-business salespeople using partial least square structural equation modeling (PLS-SEM) technique. Study results show that charismatic leadership is positively and significantly related to service-sales ambidexterity. Likewise, service-sales ambidexterity has a positive and significant relationship with service recovery performance and adaptive selling behavior. Moreover, we found a significant relationship between adaptive selling behavior and service recovery performance. The results further specify that salesperson motivation, opportunity and ability to engage in SSA significantly moderate the relationship between charismatic leadership and service-sales ambidexterity. The results suggest the need for training programs that provide the salesperson with opportunities to understand the simultaneous implementation of selling strategies while also providing customer services.
The design of atomically dispersed single atom catalysts (SACs) must consider high metal-atom loading amount, effective confinement, and strong interactions with matrix, which can maximize their catalytic performance. Here reported is a promising method to synthesize SACs on highly conductive multiwall carbon nanotube (MWCNT) supports using pulsed laser confinement (PLC) process in liquid. Atomic cobalt (Co) and phosphorus (P) with a high loading density are homogeneously incorporated on the outer wall of the MWCNT (Co−P SAC MWCNT). Density functional theory (DFT) calculations in combination with systematic control experiments found that the incorporated Co and P adatoms act as an adsorption energy optimizer and a charge transfer promoter, respectively. Hence, favorable kinetics and thermodynamics in Co−P SAC MWCNT can be simultaneously achieved for water oxidation resulting in a superior catalytic performance than the benchmark RuO 2 catalyst. Crucially, total processing time for assembling Co−P SAC MWCNT via PLC process is less than 60 min, shedding light on the promising practical applications of our SAC design strategy.
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