Iridium nanorods as a robust and stable bifunctional electrocatalyst for pH-universal water splitting

Luo, Fang; Guo, Long; Xie, Yuhua; Xu, Jinliang; Qu, Konggang; Yang, Zehui

doi:10.1016/j.apcatb.2020.119394

Cited by 96 publications

(68 citation statements)

References 66 publications

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“…The magnified d) hydrogen desorption peaks and e) the reduction potential curves in the CV curves of PdCu/Ir/C and PdCuIr/C. f) The HER overpotential at 10 mA cm −2 of the PdCu/Ir/C electrocatalyst and those of other representative Ir‐based OER electrocatalysts reported recently in acidic media [37, 49–54] . g) HER polarization curves before and after 2000 cycles (inset is CP measurement at a current density of 20 mA cm −2 ) of PdCu/Ir/C.…”

Section: Resultsmentioning

confidence: 99%

“… [28, 45] In terms of the utilization of Ir atoms, Ir‐based mass activity of PdCu/Ir/C is still far higher than the alloyed PdCuIr/C catalyst and other catalysts (Figure S11). Compared with the other state‐of‐the‐art Ir‐based electrocatalysts toward HER, the PdCu/Ir/C also shows lower overpotential and higher mass activity (Figure 4 f & Table S2) [37, 49–54] …”

Section: Resultsmentioning

confidence: 99%

“…Compared with the other state-of-the-art Ir-based electrocatalysts toward HER, the PdCu/Ir/C also shows lower overpotential and higher mass activity (Figure 4f &T able S2). [37,[49][50][51][52][53][54] TheH ER stability of the most active PdCu/Ir/C was further recorded by ADTs and CP technologies.Asshown in Figure 4d,P dCu/Ir/C shows an egative shift of only 3mVat 10 mA cm À2 after 2000 consecutive cycles with as can rate of 50 mV s À1 .F urthermore,t he CP curve is stable after 15 h durability test at ac onstant current density of 20 mA cm À2 , except for the slight fluctuation caused by al arge number of bubbles at the later stage of the CP test (the inset of Figure 4d). After the long-term HER tests,t he PdCu/Ir can well keep the structure,and very little Cu is lost in such harsh acidic conditions ( Figure S12).…”

Section: Angewandte Chemiementioning

confidence: 99%

“…f) The HER overpotentialat1 0mAcm À2 of the PdCu/Ir/C electrocatalyst and those of other representative Ir-based OER electrocatalysts reported recently in acidic media. [37,[49][50][51][52][53][54] g) HER polarization curves before and after 2000 cycles (inset is CP measurement at acurrent density of 20 mA cm À2 )o f PdCu/Ir/C.…”

Section: Angewandte Chemiementioning

confidence: 99%

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Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Zhao

Xia

et al. 2021

Angewandte Chemie

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Core/shell nanocatalysts are ac lass of promising materials,w hicha chieve the enhanced catalytic activities through the synergy between ligand effect and strain effect. However,i th as been challenging to disentangle the contributions from the two effects,whichhinders the rational design of superior core/shell nanocatalysts.H erein, we report precise synthesis of PdCu/Ir core/shell nanocrystals,w hichc an significantly boost oxygen evolution reaction (OER) via the exclusive strain effect. The heteroepitaxial coating of four Ir atomic layers onto PdCu nanoparticle gives arelatively thickIr shell eliminating the ligand effect, but creates ac ompressive strain of ca. 3.60%. The strained PdCu/Ir catalysts can deliver al ow OER overpotential and ah igh mass activity.D ensity functional theory (DFT) calculations reveal that the compressive strain in Ir shell downshifts the d-band center and weakens the binding of the intermediates,c ausing the enhanced OER activity.The compressive strain also boosts hydrogen evolution reaction (HER) activity and the strained nanocrystals can be served as excellent catalysts for both anode and cathode in overall water-splitting electrocatalysis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Angewandte Chemiementioning

confidence: 99%

Section: Angewandte Chemiementioning

confidence: 99%

See 2 more Smart Citations

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Zhao

Xia

et al. 2021

Angewandte Chemie

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“…An increased content of Ir oxide species was observed after OER, where the resulted IrO x species have been considered as favorable active sites for OER (Figure S14a, Supporting Information). [17,64] The increase in the high-valent Ni 3+ state (Figure S14b, Supporting Information) can originate from the emergence of NiOOH, [65] which is a well-known active catalyst for alkaline OER. [61] An increase in lattice oxygen (O1) is also observed, further confirming the growth of the oxide/hydroxide species on the surface of the Ni-B i /meso-Ir (Figure S14c, Supporting Information), and likely responsible for burying the signal of the other species.…”

Section: Resultsmentioning

confidence: 99%

Heterostructuring Mesoporous 2D Iridium Nanosheets with Amorphous Nickel Boron Oxide Layers to Improve Electrolytic Water Splitting

et al. 2021

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Abstract2D heterostructures exhibit a considerable potential in electrolytic water splitting due to their high specific surface areas, tunable electronic properties, and diverse hybrid compositions. However, the fabrication of well‐defined 2D mesoporous amorphous‐crystalline heterostructures with highly active heterointerfaces remains challenging. Herein, an efficient 2D heterostructure consisting of amorphous nickel boron oxide (Ni‐Bi) and crystalline mesoporous iridium (meso‐Ir) is designed for water splitting, referred to as Ni‐Bi/meso‐Ir. Benefiting from well‐defined 2D heterostructures and strong interfacial coupling, the resulting mesoporous dual‐phase Ni‐Bi/meso‐Ir possesses abundant catalytically active heterointerfaces and boosts the exposure of active sites, compared to their crystalline and amorphous mono‐counterparts. The electronic state of the iridium sites is tuned favorably by hybridizing with Ni‐Bi layers. Consequently, the Ni‐Bi/meso‐Ir heterostructures show superior and stable electrochemical performance toward both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline electrolyte.

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A Phase Engineering Strategy of Perovskite‐Type ZnSnO₃:Nd for Boosting the Sonodynamic Therapy Performance

Zhang

Zang

Yang

et al. 2023

Adv Funct Materials

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The sensitization performance of sonosensitizers plays a key role in the sonodynamic therapy (SDT) effect. Herein, ZnSnO3:Nd nanoparticles with R3c phase/amorphous heterogeneous structure are developed by phase engineering strategy and applied as an ideal sonosensitizer. In the crystalline perovskite‐type ZnSnO3:Nd, the substitution of the Zn2+ with Nd3+ causes the O 2p non‐bonded state to move toward the Fermi level, which optimizes the band structure for ultrasound sensitization by reducing bandgap. Meanwhile, the unequal charge substitution can also form electron traps and oxygen vacancies to shorten the electron migration distance, which accelerates the electron–hole separation and inhibits carrier recombination, thus improving the acoustic sensitivity. Moreover, the dangling bonds exposed on the surface of amorphous ZnSnO3:Nd provide more active sites, and the localized states of the amorphous phase may also promote carrier separation, resulting in synergistic SDT effect. In particular, the Zn2+ released from ZnSnO3:Nd in the acidic tumor microenvironment (TME) reduces the adenosine triphosphate production by inhibiting the electron transport chain , which promotes the tumor cell apoptosis through destroying the redox balance of TME. Combining the inherent second near infrared and computed tomography imaging capabilities, this ZnSnO3:Nd nanoplatform shows a promising perspective in clinic SDT field.

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Iridium nanorods as a robust and stable bifunctional electrocatalyst for pH-universal water splitting

Cited by 96 publications

References 66 publications

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Heterostructuring Mesoporous 2D Iridium Nanosheets with Amorphous Nickel Boron Oxide Layers to Improve Electrolytic Water Splitting

A Phase Engineering Strategy of Perovskite‐Type ZnSnO₃:Nd for Boosting the Sonodynamic Therapy Performance

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Iridium nanorods as a robust and stable bifunctional electrocatalyst for pH-universal water splitting

Cited by 96 publications

References 66 publications

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Heterostructuring Mesoporous 2D Iridium Nanosheets with Amorphous Nickel Boron Oxide Layers to Improve Electrolytic Water Splitting

A Phase Engineering Strategy of Perovskite‐Type ZnSnO3:Nd for Boosting the Sonodynamic Therapy Performance

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A Phase Engineering Strategy of Perovskite‐Type ZnSnO₃:Nd for Boosting the Sonodynamic Therapy Performance