Research status, opportunities, and challenges of cobalt phosphate based materials as OER electrocatalysts

Zhang, Xingheng; Hou, Qi; Cao, Shoufu; Lin, Xiaojing; Chen, Xiaodong; Wang, Zhaojie; Wei, Shuxian; Liu, Siyuan; Dai, Fangna; Lu, Xiaoqing

doi:10.1039/d3gc02416d

Cited by 19 publications

(3 citation statements)

References 108 publications

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“…Cobalt phosphate (CoPi)-based catalysts are superior OER catalyst candidates for basic and neutral water electrolysis due to their unique adjustable geometric configuration and coordination environment. − For example, ammonium cobalt phosphate (NH 4 CoPO 4 ) can be obtained by intercalation of NH 4 + into CoPO 4 . , Che et al transformed Co(OH) 2 in situ on Co foil to NH 4 CoPO 4 (NH 4 CoPO 4 /Co) with an asymmetric local atomic . The as-prepared materials exhibited excellent OER catalytic activity with a low overpotential of 254 mV at 10 mA cm –2 and a small Tafel slope of 64.4 mV dec –1 .…”

Section: Introductionmentioning

confidence: 99%

Strong Electron Interaction at the Amorphous/Crystalline Interface Enables Advanced Oxygen Evolution Reaction

Zhang,

Lin,

Cao

et al. 2024

ACS Sustainable Chem. Eng.

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Incorporating amorphous and crystalline components is undoubtedly a strategy to learn from each other's strengths and complement each other's weaknesses for advanced electrocatalysts. Here, an efficient and stable oxygen evolution reaction (OER) catalyst with an amorphous/crystalline interface is reported. Specifically, a rapid coprecipitation approach is proposed to load amorphous FePO 4 nanoparticles onto crystalline NH 4 CoPO 4 •H 2 O nanosheets, resulting in a fascinating amorphous/crystalline interface. The prominent coupled effect between FePO 4 and NH 4 CoPO 4 •H 2 O is afforded by the interfacial phosphates, which build efficient channels to transfer electrons from Co to Fe. Besides the unique electronic structure, the coupled amorphous/crystalline hybrid facilitates the formation of highly active Co intermediates and accelerates the reaction kinetics and charge transport. Detailed electrochemical characterization reveals that this advantageous interface structure results in a notable decrease in the overpotential of the OER compared to materials with an amorphous phase or crystalline phase alone. The FePO 4 /NH 4 CoPO 4 •H 2 O hybrid exhibits a small overpotential of only 230 mV to achieve a current density of 10 mA cm −2 in 1 M KOH and 220 mV at 1 mA cm −2 in 0.1 M phosphate-buffered solution (PBS), which are much lower than the corresponding values of the pristine ones. It is envisioned that the highly operable amorphous−crystalline interface may open up new opportunities in rational design for advanced electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Strong Electron Interaction at the Amorphous/Crystalline Interface Enables Advanced Oxygen Evolution Reaction

Zhang,

Lin,

Cao

et al. 2024

ACS Sustainable Chem. Eng.

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“…5–9 However, the anodic oxygen evolution reaction (OER) always demands high overpotentials, which reduces the energy efficiency of the process. 10–12 Moreover, the electrolyte used for water electrolysis is usually freshwater. The scarcity of freshwater resources will also become an obstacle for the large-scale application of the technology.…”

Section: Introductionmentioning

confidence: 99%

Eggshell membrane-derived metal sulfide catalysts for seawater splitting

Cui,

Zhang,

Shen

2024

Green Chem.

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“…Lithium cobalt phosphates have shown promising electrocatalytic behavior for water oxidation (OER) (Table S1), much akin to the well-demonstrated remarkable catalytic activity of cobalt phosphate (Co-Pi) in a neutral medium. − These studies demonstrated that the coordination environment and electronic structure of the cobalt atom along with the phosphate group influence the catalytic performance and stability of the catalyst. ,, In 2012, Lee et al examined the OER activity of the Pnma -LiCoPO 4 in neutral and alkaline medium highlighting the potential of LiCoPO 4 as an efficient electrocatalyst for water oxidation vis-à-vis the activity of LiCoO 2 . Later, Kim et al reported the effect of coordination geometry around cobalt ions toward water oxidation by investigating four different heterometallic Li or Na containing cobalt phosphates, LiCoPO 4 , Li 2 CoP 2 O 7 , NaCoPO 4 , and Na 2 CoP 2 O 7 , exhibiting comparable activity and stability to that of Co-Pi in neutral medium .…”

Section: Introductionmentioning

confidence: 99%

Thermally Labile Organic-Soluble Heterometal Diorganophosphate-Derived Efficient Electrocatalysts for the Oxygen Evolution Reaction

Chaudhary,

Murugavel

2024

Chem. Mater.

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Heterometal phosphates are burgeoning electrocatalysts and cathode materials in energy storage and conversion devices. In this work, we demonstrate a novel and clean synthetic route for substoichiometric lithium-deficient metastable Cmcm-Li 0.65(7) Co 1.16(2) PO 4 (Li-Co-P-HEX) and metaphosphate P2 1 2 1 2 1 -LiCo(PO 3 ) 3 (Li-Co-P-BT), starting from the same starting material [LiCo(dtbp) 3 ] (dtbp = di-tert-butyl phosphate) through a thermolytic single-source precursor approach. The heterometal organophosphate [LiCo(dtbp) 3 ] decomposed into different phases of inorganic heterometal phosphates by employing a solution and solid-state thermal treatment. The solution-processed Li-deficient orthophosphate exhibits superior oxygen evolution reaction activity, delivering a current density of 10 mA cm −2 at an overpotential of 294 mV, outperforming other reported lithium− cobalt phosphates for water oxidation. The enhanced performance of the Cmcm-Li 0.65(7) Co 1.16(2) PO 4 as an electrocatalyst elucidates the synergistic effect generated by the structure, composition, and morphology.

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Research status, opportunities, and challenges of cobalt phosphate based materials as OER electrocatalysts

Abstract: Although water splitting is currently the most promising technology for preparing green hydrogen on a large scale, the high energy consumption has limited its industrial application. The sluggishness of the...

Cited by 19 publications

References 108 publications

Strong Electron Interaction at the Amorphous/Crystalline Interface Enables Advanced Oxygen Evolution Reaction

Strong Electron Interaction at the Amorphous/Crystalline Interface Enables Advanced Oxygen Evolution Reaction

Eggshell membrane-derived metal sulfide catalysts for seawater splitting

Thermally Labile Organic-Soluble Heterometal Diorganophosphate-Derived Efficient Electrocatalysts for the Oxygen Evolution Reaction

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