Heterojunction of CoMoO4/SrTiO3 as efficient electrocatalysts for hydrogen evolution reaction and oxygen evolution reaction in alkaline media
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Bibliographic record
Abstract
• A p–n heterojunction was engineered between CoMoO₄ (CMO) and SrTiO₃ (STO) to modulate electronic states for enhanced electrocatalysis. • The 60%CMO-STO heterojunction exhibited superior bifunctional activity with low overpotentials of 102 mV (HER) and 280 mV (OER) in alkaline media. • Enhanced hydroxyl adsorption and charge redistribution at the interface improved catalytic performance. • Electrochemical analysis revealed the highest double-layer capacitance (Cdl) and electrochemically active surface area (ECSA) for 60%CMO-STO. • The heterojunction demonstrated the lowest Tafel slope, indicating improved reaction kinetics and charge transfer efficiency. Developing efficient and cost-effective bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by modulation of the electronic states is critical for sustainable hydrogen production. In this study, we engineered a heterojunction between CoMoO 4 (CMO) and SrTiO 3 (STO). The p-n junction between CMO and STO tunes their electronic structure and redistributes the surface charges. The positive charge induced by the p-n junction offers greater adsorption of hydroxyls on the surface of the electrocatalysts. The optimized 60% CMO/STO heterojunction exhibited the most promising bifunctional activity, achieving the lowest overpotential of 102 mV for HER and 280 mV for OER in alkaline media. Electrochemical studies revealed that the 60% CMO/STO shows the highest double-layer capacitance (Cdl) and the largest electrochemically active surface area (ECSA), indicating superior charge transfer and active site availability. Moreover, based on work functions, the enhanced electron transfer and optimized hydroxyl ions adsorption due to the position charge distribution result in superior HER and OER performance. Additionally, it demonstrates the smallest Tafel slope, highlighting its enhanced reaction kinetics. This work highlights the role of heterojunction and interfacial electron transfer descriptors for enhanced OER and HER performance of the p-n junction, providing a venue to design a new electrocatalytic system for bifunctional activities.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it