Iron triad (Fe, co, Ni) trinary phosphide nanosheet arrays as high-performance bifunctional electrodes for full water splitting in basic and neutral conditions

Zhang, Zhe; Hao, Jinhui; Yang, Wenshu; Tang, Jilin

doi:10.1039/c5ra26748j

Cited by 66 publications

(43 citation statements)

References 87 publications

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“…[2][3][4] Since a pH-neutral environment is required for biological growth, water oxidation should function efficiently in neutral pH if it is to enable ever-higherperforming biohybrid systems for the synthesis of fuels and chemicals using renewable energy. [5,6] Unfortunately, the overpotential for the oxygen evolution reaction (OER) is in general very high (>460 mV at 10 mA cm −2 ) [7][8][9][10] under neutral pH. As a result, bioelectrolysis systems have exhibited low power conversion efficiencies.…”

Section: Doi: 101002/adma201906806mentioning

confidence: 99%

Hydration‐Effect‐Promoting Ni–Fe Oxyhydroxide Catalysts for Neutral Water Oxidation

et al. 2020

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Oxygen evolution reaction (OER) catalysts that function efficiently in pH‐neutral electrolyte are of interest for biohybrid fuel and chemical production. The low concentration of reactant in neutral electrolyte mandates that OER catalysts provide both the water adsorption and dissociation steps. Here it is shown, using density functional theory simulations, that the addition of hydrated metal cations into a Ni–Fe framework contributes water adsorption functionality proximate to the active sites. Hydration‐effect‐promoting (HEP) metal cations such as Mg2+ and hydration‐effect‐limiting Ba2+ into Ni–Fe frameworks using a room‐temperature sol–gel process are incorporated. The Ni–Fe–Mg catalysts exhibit an overpotential of 310 mV at 10 mA cm−2 in pH‐neutral electrolytes and thus outperform iridium oxide (IrO2) electrocatalyst by a margin of 40 mV. The catalysts are stable over 900 h of continuous operation. Experimental studies and computational simulations reveal that HEP catalysts favor the molecular adsorption of water and its dissociation in pH‐neutral electrolyte, indicating a strategy to enhance OER catalytic activity.

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Section: Doi: 101002/adma201906806mentioning

confidence: 99%

Hydration‐Effect‐Promoting Ni–Fe Oxyhydroxide Catalysts for Neutral Water Oxidation

et al. 2020

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“…According to the DFT calculations, Co delivers the moderate trapping of atomic H and facile desorption of the generated H 2 due to the H‐poisoned surface active sites of the mixed phosphide . In another example, Fe x Co y Ni z P nanosheets was synthesized via ED of Fe x Co y Ni z layered double hydroxide onto Ni foam followed by NaH 2 PO 2 ‐assisted phosphorization . The authors proposed that excellent catalytic performance of the thus obtained quaternary cathode, in part, is due to synergistic and strong couple effects from the iron triad (Fe, Co, Ni).…”

Section: Recent Advances In Synthesismentioning

confidence: 99%

Structure–Activity Relationships for Pt‐Free Metal Phosphide Hydrogen Evolution Electrocatalysts

Owens‐Baird

Kolen’ko

Kovnir

2017

Chemistry A European J

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In the field of renewable energy, the splitting of water into hydrogen and oxygen fuel gases using water electrolysis is a prominent topic. Traditionally, these catalytic processes have been performed by platinum-group metal catalysts, which are effective at promoting water electrolysis but expensive and rare. The search for an inexpensive and Earth-abundant catalyst has led to the development of 3d-transition-metal phosphides for the hydrogen evolution reaction. These catalysts have shown excellent activity and stability. In this review, we discuss the electronic and crystal structures of bulk and surface of selected Fe, Co, and Ni phosphides, and their relationships to the experimental catalytic activity. The various synthetic protocols towards the state-of-the-art transition metal phosphide electrocatalysts are also discussed.

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“…Water Oxidation been focused on the development of OER catalytic materials, and a variety of materials have been developed to show superior performance to the commonly used commercial RuO 2 . [7][8][9][10] As an important class of OER catalysts, various transition metalbased materials with a focus on Fe and Ni compounds, [11] including oxides, [12][13][14][15][16][17] hydroxides, [5,[18][19][20][21][22][23][24][25] selenides, [26,27] phosphides, [28][29][30][31][32][33] and phosphates, [34,35] have been identified as active catalysts for OER.…”

Section: Introductionmentioning

confidence: 99%

Scalable Fabrication of Highly Active and Durable Membrane Electrodes toward Water Oxidation

Liu

et al. 2017

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The electrocatalytic oxygen evolution reaction (OER) is a highly important reaction that requires a relatively high overpotential and determines the rate of water splitting—a process for producing hydrogen. The overall OER performance is often largely limited by uncontrollable interface when active catalysts are loaded on conductive supports, for which polymer binders are widely used, but inevitably block species transportation channels. Here, a scalable fabrication approach to freestanding graphitized carbon nanofiber networks is reported, which provides abundant sites for in situ growing Fe/Ni catalysts with the improved interface. The fabricated hybrid membrane exhibits high activity and durability toward OER, with an overpotential of 280 mV at a geometrical current density of 10 mA cm−2 and a Tafel slope of 30 mV dec−1 in alkaline medium. As implemented as a freestanding electrode, the 3D hybrid structure achieves further enhanced OER performance with an overpotential down to 215 mV at 10 mA cm−2. This work provides fresh insights into rationally fabricating OER electrocatalysts from the angle of electrode design.

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Iron triad (Fe, co, Ni) trinary phosphide nanosheet arrays as high-performance bifunctional electrodes for full water splitting in basic and neutral conditions

Abstract: A bifunctional electrode consisted of trinary transition-metal phosphide nanosheets on Ni foam has been developed through a facile two-step process.

Cited by 66 publications

References 87 publications

Hydration‐Effect‐Promoting Ni–Fe Oxyhydroxide Catalysts for Neutral Water Oxidation

Hydration‐Effect‐Promoting Ni–Fe Oxyhydroxide Catalysts for Neutral Water Oxidation

Structure–Activity Relationships for Pt‐Free Metal Phosphide Hydrogen Evolution Electrocatalysts

Scalable Fabrication of Highly Active and Durable Membrane Electrodes toward Water Oxidation

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