Bimetallic (FexNi1−x)2P nanoarrays as exceptionally efficient electrocatalysts for oxygen evolution in alkaline and neutral media

Yin

et al. 2020

Chemistry A European J

Cost‐effective, highly efficient and stable non‐noble metal‐based catalysts for the oxygen evolution reaction (OER) are very crucial for energy storage and conversion. Here, an amorphous cobalt nickel phosphate (CoNiPO4), containing a considerable amount of high‐valence Ni3+ species as an efficient electrocatalyst for OER in alkaline solution, is reported. The catalyst was converted from Co‐doped Ni2P through pulsed laser ablation in liquid (PLAL) and exhibits a large specific surface area of 162.5 m2 g−1 and a low overpotential of 238 mV at 10 mA cm−2 with a Tafel slope of 46 mV dec−1, which is much lower than those of commercial RuO2 and IrO2. This work demonstrates that PLAL is a powerful technology for generating amorphous CoNiPO4 with high‐valence Ni3+, thus paving a new way towards highly effective OER catalysts.

Section: Figurementioning

confidence: 99%

Laser‐Ablation‐Produced Cobalt Nickel Phosphate with High‐Valence Nickel Ions as an Active Catalyst for the Oxygen Evolution Reaction

Sun

Yin

et al. 2020

Chemistry A European J

“…In addition, the peaks for Ni in Fe 0.37 Ni 0.17 Co 0.36 Se are shifted toward higher binding energies compared with that of NiCo 2 Se 4 , which implies stronger electron interactions in Fe 0.37 Ni 0.17 Co 0.36 Se. The opposite shifts for cobalt and nickel indicate the existence of electron transfer between these elements, which results in a beneficial synergy between them . The strong electron interactions between Fe, Ni, Co, and Se may contribute to the better electrocatalytic performance of Fe 0.37 Ni 0.17 Co 0.36 Se compared with NiCo 2 Se 4 .…”

Section: Resultsmentioning

confidence: 99%

“…The opposites hifts for cobalt and nickel indicate the existence of electron transfer between these elements,w hich results in ab eneficial synergyb etween them. [11] The strong electron interactions between Fe, Ni, Co, and Se may contribute to the better electrocatalytic performance of Fe 0.37 Ni 0.17 Co 0.36 Se compared with NiCo 2 Se 4 .F igure 4d displays the XPS spectrum of Se. The bindinge nergies at 54.6 (Se 3d 3/2 ) and 53.8 eV (Se 3d 5/2 )a re due to Se 2À .T his indicates the formation of selenide.…”

Section: Resultsmentioning

confidence: 99%

Quaternary Iron Nickel Cobalt Selenide as an Efficient Electrocatalyst for Both Quasi‐Solid‐State Dye‐Sensitized Solar Cells and Water Splitting

Chemistry An Asian Journal

Feng

Zhao

et al. 2019

Iron nickel cobalt selenides are synthesized through a one‐step hydrothermal method. Quaternary Fe0.37Ni0.17Co0.36Se demonstrates multifunctionality and shows high electrocatalytic activity for quasi‐solid‐state dye‐sensitized solar cells with a power conversion efficiency of 8.42 %, the hydrogen evolution reaction, the oxygen evolution reaction, and water splitting. The electric power output from tandem quasi‐solid‐state dye‐sensitized solar cells under one‐sun illumination is sufficient to split water and exhibits a solar‐to‐hydrogen conversion efficiency of 5.58 % with Fe0.37Ni0.17Co0.36Se as the electrocatalyst in this integrated system. Owing to a remarkable synergistic effect, quaternary Fe0.37Ni0.17Co0.36Se is proven to be superior to ternary nickel cobalt selenide in terms of conductivity, electrocatalytic activity, and photovoltaic performance.

“…All the sample contained CdS show the similar XRD patterns compared with the pure CdS sample, which proved that the existence of Ni 2 P and g‐C 3 N 4 could hardly change the crystalline structure of CdS nanorods. The pristine Ni 2 P sample dispalys clear characteristic diffraction peaks at 40.7 ○ , 44.5 ○ , 47.4 ○ , 54.3 ○ , 54.8 ○ , 66.2 ○ , 72.7 ○ and 74.8 ○ which corresponding to (111), (201), (210), (300), (211), (310), (311) and (400) planes of the hexagonal phase structure of Ni 2 P (PDF#04‐004‐5163) …”

Section: Resultsmentioning

confidence: 99%

Rationally Designed Functional Ni₂P Nanoparticles as Co–Catalyst Modified CdS@g‐C₃N₄ Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Jin

2019

ChemistrySelect

Ni2P nanoparticle contained no precious metal as co‐catalyst to touch up CdS nanorods coupling with graphitic C3N4 for H2 evolution was synthesized successfully by in‐situ fabrication approach. The preparative Ni2P‐CdS/g‐C3N4 composite catalyst exerts remarkable hydrogen production activity and exhibit good photostability in 20 hour cycles. The hydrogen evolution rate is 9.9 times as high as that of pure CdS. Morphological characterization, optical results and electrochemical test proved that special CdS/g‐C3N4 enhanced the transfer of electrons on CdS and g‐C3N4, loading Ni2P co‐catalyst further increased the synergistic effect in photocatalytic properties. Several characterization results such as transmission electron microscopy (TEM), X‐ray diffraction (XRD), The Ultraviolet–visible spectroscopy diffuse reflectance spectroscopy (UV‐vis DRS), Photoluminescence (PL) and nitrogen adsorption‐desorption isotherms (BET) etc. indicate that the Ni2P nanoparticles loaded on the CdS/g‐C3N4 exposed more active sites and facilitated the efficiency of photogenic electron‐hole pairs separation. Optimistically, these results were good consistent with each other. This considerable performance probablely attribute to the special conduction band (CB) and valence band (VB) of CdS and g‐C3N4 which form a heterojuction and the introduction of Ni2P as cocatalyst further extract photogenerated electrons that lower the over potential of H+ redution.