Electronic‐State Modulation of Metallic Co‐Assisted Co7Fe3 Alloy Heterostructure for Highly Efficient and Stable Overall Water Splitting DOI Creative Commons
Xinyu Wang, Xiaoqin Xu,

Yao Nie

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 10(22)

Published: May 23, 2023

Abstract Manipulating electronic structure of alloy‐based electrocatalysts can eagerly regulate its catalytic efficiency and corrosion resistance for water splitting fundamentally understand the mechanisms oxygen/hydrogen evolution reactions (OER/HER). Herein, metallic Co‐assisted Co 7 Fe 3 alloy heterojunction (Co /Co) embeds in a 3D honeycomb‐like graphitic carbon is purposely constructed as bifunctional catalyst overall splitting. As‐marked /Co‐600 displays excellent activities alkaline media with low overpotentials 200 mV OER 68 HER at 10 mA cm −2 . Theoretical calculations reveal redistribution after coupling , which likely forms electron‐rich state over interfaces electron‐delocalized alloy. This process changes d ‐band center position /Co optimizes affinity surface to intermediates, thus promoting intrinsic OER/HER activities. For splitting, electrolyzer only requires cell voltage 1.50 V achieve dramatically retains 99.1% original activity 100 h continuous operation. work proposes an insight into modulation alloy/metal heterojunctions explores new path construct more competitive

Language: Английский

Unraveling and leveraging in situ surface amorphization for enhanced hydrogen evolution reaction in alkaline media DOI Creative Commons
Qiang Fu, Lok Wing Wong, Fangyuan Zheng

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 13, 2023

Surface amorphization provides electrocatalysts with more active sites and flexibility. However, there is still a lack of experimental observations mechanistic explanations for the in situ process its crucial role. Herein, we propose concept that by reconstructed amorphous surface, metal phosphorus trichalcogenides could intrinsically offer better catalytic performance alkaline hydrogen production. Trace Ru (0.81 wt.%) doped into NiPS3 nanosheets Using electrochemical transmission electron microscopy technique, confirmed occurred on edges critical achieving superior activity. Comprehensive characterizations theoretical calculations reveal primarily stabilized at through formed layer containing bridging S22- species, which can effectively reduce reaction energy barrier. This work emphasizes role suggests potential optimizing activities electrocatalysts.

Language: Английский

Citations

47
A Unique Etching‐Doping Route to Fe/Mo Co‐Doped Ni Oxyhydroxide Catalyst for Enhanced Oxygen Evolution Reaction DOI

Yunpeng Wei,

Lingya Yi,

Rongfei Wang

et al.

Small, Journal Year: 2023, Volume and Issue: 19(37)

Published: May 5, 2023

Fe-doped Ni (oxy)hydroxide shows intriguing activity toward oxygen evolution reaction (OER) in alkaline solution, yet it remains challenging to further boost its performance. In this work, a ferric/molybdate (Fe3+ /MoO42- ) co-doping strategy is reported promote the OER of oxyhydroxide. The reinforced Fe/Mo-doped oxyhydroxide catalyst supported by nickel foam (p-NiFeMo/NF) synthesized via unique plasma etching-electrochemical doping route, which precursor Ni(OH)2 nanosheets are first etched form defect-rich amorphous nanosheets, followed electrochemical cycling trigger simultaneously Fe3+ and phase transition. This p-NiFeMo/NF requires an overpotential only 274 mV reach 100 mA cm-2 media, exhibiting significantly enhanced compared NiFe layered double hydroxide (LDH) other analogs. Its does not fade even after 72 h uninterrupted operation. situ Raman analysis reveals that intercalation MoO42- able prevent over-oxidation NiOOH matrix from β γ phase, thus keeping at most active state.

Language: Английский

Citations

46
Surface Reconstruction of Covellite CuS Nanocrystals for Enhanced OER Catalytic Performance in Alkaline Solution DOI
Jiamin Zhu,

Shengjie Zi,

Nan Zhang

et al.

Small, Journal Year: 2023, Volume and Issue: 19(37)

Published: May 7, 2023

Oxygen evolution reaction (OER) is one of the important half-reactions in energy conversion equipment such as water-spitting devices, rechargeable metal-air batteries, and so on. It beneficial to develop efficient low-cost catalysts that understand mechanism OER analyze reconstruction phenomenon transition metal sulfide. Interestingly, copper sulfide cuprous with same components possess different behaviors due their ion valence states atomic arrangement modes. Because a unique sequence certain cationic defects, CuS nanomaterials are S2- firstly oxidized SO42- then Cux+ converted into CuO via Cu(OH)2 . In addition, specific "modified hourglass structure" excellent conductivity easier produce intermediates. Compared Cu2 S, exhibits activity lower overpotential 192 mV at 10 mA cm-2 remarkable electrochemical stability 1.0 m KOH for 120 h. Herein, this study elucidates modes S process reveals has stronger CuS bond faster electronic transmission efficiency structure," resulting than S.

Language: Английский

Citations

45
Making Ternary‐Metal Hydroxysulfide Catalyst via Cathodic Reconstruction with Ion Regulation for Industrial‐Level Hydrogen Generation DOI
Fang Peng, Mingze Zhu,

Jiao Liu

et al.

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(35)

Published: July 21, 2023

Abstract Deep insight into electrochemical reconstruction aids in the decoding of electrocatalytic mechanisms and development design principles for advanced catalysts. Despite recent achievements, research concerning cathodic is still lacking compared to anodic variety. This work captures electroreductive dynamics over bimetal Ni–Mo sulfide by various in/ex situ techniques, whereby steered with ion regulation achieve a heterogeneous Ni–Mo–Fe ternary metal hydroxysulfide (NMFSOH) as robust hydrogen‐evolving catalyst that competent industrial‐level water electrolysis. The thermodynamically adaptive heterosynergism resultant NMFSOH can coordinate dissociation hydrogenation alkaline hydrogen evolution reaction even at high current densities. A flow‐type electrolyzer dual electrodes affords an electricity consumption 3.99 kW h Nm −3 electricity‐to‐hydrogen efficiency 88.7%, manifesting its competitive cost‐effectiveness toward practical applications. study showcases ion‐regulatory effective strategy construct high‐performance electrocatalysts.

Language: Английский

Citations

45
Electronic‐State Modulation of Metallic Co‐Assisted Co7Fe3 Alloy Heterostructure for Highly Efficient and Stable Overall Water Splitting DOI Creative Commons
Xinyu Wang, Xiaoqin Xu,

Yao Nie

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 10(22)

Published: May 23, 2023

Abstract Manipulating electronic structure of alloy‐based electrocatalysts can eagerly regulate its catalytic efficiency and corrosion resistance for water splitting fundamentally understand the mechanisms oxygen/hydrogen evolution reactions (OER/HER). Herein, metallic Co‐assisted Co 7 Fe 3 alloy heterojunction (Co /Co) embeds in a 3D honeycomb‐like graphitic carbon is purposely constructed as bifunctional catalyst overall splitting. As‐marked /Co‐600 displays excellent activities alkaline media with low overpotentials 200 mV OER 68 HER at 10 mA cm −2 . Theoretical calculations reveal redistribution after coupling , which likely forms electron‐rich state over interfaces electron‐delocalized alloy. This process changes d ‐band center position /Co optimizes affinity surface to intermediates, thus promoting intrinsic OER/HER activities. For splitting, electrolyzer only requires cell voltage 1.50 V achieve dramatically retains 99.1% original activity 100 h continuous operation. work proposes an insight into modulation alloy/metal heterojunctions explores new path construct more competitive

Language: Английский

Citations

44