Superhydrophilic V‐Doped CoP Nanoparticles@Cu3P Nanotubes with Vacancy and Interface Engineering for Synergistically Enhanced Electrocatalytic Overall Water Splitting DOI

Yongkai Sun,

Jingjie Dai,

He Lv

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 29, 2025

Abstract Synergistically optimizing electronic structure and exposing abundant active sites to significantly improve performance of transition metal‐based electrocatalysts is an urgent necessity remains a significant challenge. Herein, hybrid nanotubes array rich P‐vacancy V‐CoP@Cu 3 P in situ grown on copper foam (V ‐V‐CoP@Cu HNTAs/CF) fabricated for overall water splitting. The combined experimental theoretical calculations reveal that V doping‐induced vacancies lead the formation local electric field within V‐CoP heterojunction‐induced built‐in field, which can jointly accelerate electron transfer charge separation, thereby enhancing reaction kinetics. Moreover, nanotube not only increase electrochemical surface area offer superior mass transfer, but also possess superhydrophilic nature utilization efficiency electrode surfaces. Due these advantages, HNTAs/CF provide distinguished HER OER activity, by employing as bifunctional electrocatalysts, splitting device delivered current density 10 mA cm −2 at low voltage 1.46 maintained its activity without decay 200 h 1 m KOH electrolyte.

Language: Английский

Revealing the Tandem Behavior of Iron‐Group/Copper Binary Catalysts in the Electroreduction of Nitrate to Ammonia DOI Open Access

Qiuyu Yan,

Rundong Zhao, Chen Huang

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract As a green strategy for both ammonia (NH 3 ) production and wastewater purification, electrochemical reduction of nitrate (NO RR) faces challenges due to the nitrite 2 − accumulation competitive hydrogen evolution reaction (HER). Tandem catalysis NO NH offers great potential enhancing selectivity. Herein, iron‐group (Fe, Co, or Ni) nanosheets are introduced onto Cu nanowires construct Cu‐Fe, Cu‐Co, Cu‐Ni tandem systems respectively. Specifically, sites facilitate conversion . Fe sites, similar Cu, reduce , exacerbating rather than converting it their inability precisely capture Co exhibiting excellent moderate HER activity, can seamlessly operate with realize well‐ordered relay catalysis, which achieves superior yield rate 48.44 mg h −1 cm −2 Ni demonstrate removal capability at low overpotentials, leading Faraday efficiency 99.47%. However, its remarkable HER‐active property demonstrated via in situ polarization imaging makes challenge ampere‐level current densities. This work identifies behavior coupled providing reference design further optimization system.

Language: Английский

Citations

1
Intermetallic Compound and Solid Solutions of Co75Me25 (Me: Si, Fe, Cr) as Catalysts for the Electrochemical Reaction of Nitrate Conversion to Ammonia DOI Open Access
Irina Kuznetsova, Dmitry Kultin, Olga Lebedeva

et al.

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(4), P. 1650 - 1650

Published: Feb. 14, 2025

A sustainable reaction of electrocatalytic nitrate conversion in ammonia production (NO3RR) occurring under ambient conditions is currently prime interest, as well urgent research due to the real potential replacement environmentally unfavorable Haber-Bosch process. Herein, a series electrocatalysts based on two-component cobalt alloys was synthesized using low-cost non-noble metals Co, Fe, Cr, and also Si. The samples were characterized studied by following methods: SEM, EDX, XRD (both transmission reflection), UV-VIS spectroscopy, optical microscopy, linear (and cyclic) voltammetry, chronoamperometry, electrochemical impedance spectroscopy. Beyond that, determination electrochemically active surface area carried out for all electrocatalysts. Unexpectedly, sample having an intermetallic compound (IMC) composition Co2Si turned be most highly effective. highest Faradaic efficiency (FE) 80.8% at E = -0.585 V (RHE) yield rate 22.3 µmol h-1 cm-2 -0.685 indicate progressive role IMC main component electrocatalyst. Thus, this study demonstrates promise enormous efficient NO3RR. This work can serve primarily starting point future studies reactions catalysts containing metals.

Language: Английский

Citations

0
Electroreduction of nitrate into ammonia on Co3O4: Mechanistic insights into Co2+-promoted NO3RR performance DOI
Yu Sun,

Yaxin Shi,

Yuhang Gao

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162506 - 162506

Published: April 1, 2025

Language: Английский

Citations

0
Ultra-fast Joule heating synthesis of homogeneous copper-based bimetallic catalysts for electrochemical nitrate-to-ammonium reduction in wastewater treatment DOI
Jenn Fang Su, Manh Hoang, Herma Dina Setiabudi

et al.

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 133312 - 133312

Published: April 1, 2025

Language: Английский

Citations

0
Superhydrophilic V‐Doped CoP Nanoparticles@Cu3P Nanotubes with Vacancy and Interface Engineering for Synergistically Enhanced Electrocatalytic Overall Water Splitting DOI

Yongkai Sun,

Jingjie Dai,

He Lv

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 29, 2025

Abstract Synergistically optimizing electronic structure and exposing abundant active sites to significantly improve performance of transition metal‐based electrocatalysts is an urgent necessity remains a significant challenge. Herein, hybrid nanotubes array rich P‐vacancy V‐CoP@Cu 3 P in situ grown on copper foam (V ‐V‐CoP@Cu HNTAs/CF) fabricated for overall water splitting. The combined experimental theoretical calculations reveal that V doping‐induced vacancies lead the formation local electric field within V‐CoP heterojunction‐induced built‐in field, which can jointly accelerate electron transfer charge separation, thereby enhancing reaction kinetics. Moreover, nanotube not only increase electrochemical surface area offer superior mass transfer, but also possess superhydrophilic nature utilization efficiency electrode surfaces. Due these advantages, HNTAs/CF provide distinguished HER OER activity, by employing as bifunctional electrocatalysts, splitting device delivered current density 10 mA cm −2 at low voltage 1.46 maintained its activity without decay 200 h 1 m KOH electrolyte.

Language: Английский

Citations

0