Pt/RuO<sub>2</sub>-TiO<sub>2</sub>Electrocatalysts Exhibit Excellent Hydrogen Evolution Activity in Alkaline Media

He, Cheng; Wang, Guanxiong; Parrondo, Javier; Sankarasubramanian, Shrihari; Ramani, Vijay

doi:10.1149/2.1661712jes

Cited by 23 publications

(12 citation statements)

References 34 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above findings referred to PdO/TiO 2 as an active catalyst for the electrochemical generation of H 2 . Its activity for the HER in alkaline media outperformed some active TiO 2 ‐based electrocatalysts, and comparable with others reported in the literature …”

Section: Results and Discusionsupporting

confidence: 93%

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu₂O₃nanocomposites in a strong alkaline solution

et al. 2019

View full text Add to dashboard Cite

Summary In this work, PdO/TiO2 and Eu2O3/TiO2 nanocomposites (NCs) were synthesized using a new facile, template‐free, and one‐step solvothermal approach and characterized by several instrumentation techniques. X‐ray photoelectron spectroscopy studies revealed the presence of oxidized form of the Pd and Eu nanoparticles within the NC materials (PdO and Eu2O3). The two catalysts exhibited remarkable activity for the hydrogen evaluation reaction (HER) in a strong alkaline solution (4.0 M NaOH) with PdO/TiO2 catalyst being the best, which recorded an exchange current density (jo) of 0.26 mA cm−2 and a Tafel slope (βc) of 125 mV dec−1. Such parameters are not far from those recorded for a commercial Pt/C catalyst (0.71 mA cm−2 and 120 mV dec−1) performed here under the same operating conditions. Eu2O3/TiO2 catalyst recorded jo and βc values of 0.05 mA cm−2 and 135 mV dec−1. The Tafel slopes 125 and 135 mV dec−1 calculated on the PdO/TiO2 and Eu2O3/TiO2 catalysts suggest a HER kinetics controlled by the Volmer step. PdO/TiO2 catalyzed the HER with a high turnover frequency of 2.3 H2/s at 0.2 V versus the reversible hydrogen electrode, while Eu2O3/TiO2 catalyst only measured a turnover frequency value of 1.25 H2/s at the same overpotential. The two catalysts exhibited excellent stability and durability after 10 000 cycles and 72 hours of controlled potential electrolysis at a high cathodic overpotential, reflecting their practical applicability. Scanning electron microscope and X‐ray photoelectron spectroscopy examinations revealed that the morphology and chemistry of both catalysts were not altered as a result of the performed long‐term stability and durability tests.

show abstract

Section: Results and Discusionsupporting

confidence: 93%

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu₂O₃nanocomposites in a strong alkaline solution

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The above results highlighted ZnO/TiO 2 as an efficient electrocatalyst for H 2 production. Its alkaline HER catalytic activity is comparable with some highly active TiO 2 ‐based electrocatalysts reported in the literature 76,77,86,87 . More comparison details are shown in Table S1.…”

Section: Resultssupporting

confidence: 69%

Crystalline ZnO and ZnO / TiO ₂ nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H ₂ generation in alkaline electrolytes

et al. 2020

View full text Add to dashboard Cite

Summary A newly synthesized zinc(II) complex, namely tert‐butyl N‐(2 mercaptoethyl)carbamatozinc(II) complex [Zn(Boc‐S)2] (Boc = tert‐butyl N‐[2‐mercaptoethyl]carbamate), has been used as an organozinc precursor for the production of crystalline ZnO and ZnO/TiO2 nanoparticles. The synthesized complex and the obtained nanomaterials were fully characterized using various spectroscopic and surface analysis techniques. Their surface morphology, chemical purity and stoichiometry have been investigated by scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX) as well as X‐ray fluorescence. The synthesized Zn(II) molecular complex, ZnO and ZnO/TiO2 nanomaterials have been tested in alkaline aqueous solution (1.0 MNaOH) for the hydrogen evolution reaction (HER) using various electrochemical techniques. The results revealed high HER catalytic performance of ZnO and ZnO/TiO2 cathode materials, with the latter exhibiting higher catalytic activity recording an exchange current density (jo) of 0.3 mA cm−2. This current value, which approaches that of Pt wire (0.5 mA cm−2), cross‐sectional area ~0.008 cm2, is about 11 and 100 times greater than those measured for ZnO alone (0.028 mA cm−2) and TiO2 alone (0.0032 mA cm−2), respectively. Moderate catalytic activity was recorded for the complex catalyst, namely GC‐Zn(Boc‐S)2 with jo value of (0.01 mA cm−2). Tafel slope values of 130 and 122 mV dec−1 were calculated for ZnO and ZnO/TiO2, respectively. Such Tafel slope values, which are close to that of the Pt wire (120 mV dec−1), referred to a Volmer‐controlled HER kinetics. Other important electrochemical parameters describing the kinetics of the HER, such as roughness factor (Rf) and turnover frequency (TOF) were also estimated and discussed. The high numerical values of the various HER kinetic parameters recorded for the ZnO/TiO2 catalyst, in addition to its high stability and durability (stable for up to 10 000 continuous cathodic polarization cycles), besides maintaining its morphology and chemical composition after stability test (confirmed from SEM/EDX and XRD examinations), located it in a privileged position among the most efficient HER electrocatalysts reported in the literature.

show abstract

“…Due to the confinement effect of the RTO substrate, the Pt particles display an average particle size of 6 nm. Although the commercial Pt/C catalyst has a smaller particle size (≈2.5 nm), the Pt/RTO heterostructure exhibited higher HER activity with an exchange current density of 2.31 ± 0.06 mA cm −2 pt in 0.1 m KOH, which is five times that of the 46.5% Pt/C catalyst . The reason for this dramatic enhancement could be ascribed to the presence of oxygen vacancies in RuO 2 , which promoted the water dissociation step and thus largely reduced the activation energy for the HER process.…”

Section: Heterostructured Catalysts For Hermentioning

confidence: 99%

Section: Heterostructured Catalysts For Hermentioning

confidence: 99%

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Zhao

Rui

Dou

et al. 2018

Adv Funct Materials

1,072

708

View full text Add to dashboard Cite

Developing sustainable and renewable energy sources along with efficient energy storage and conversion technologies is vital to address environmental and energy challenges. Electrochemical water splitting coupling with gridscale renewable energy harvesting technologies is becoming one of the most promising approaches. Besides, hydrogen with the highest mass-energy density of any fuel is regarded as the ultimate clean energy carrier. The realization of practical water splitting depends heavily on the development of low-cost, highly active, and durable catalysts for hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs). Recently, heterostructured catalysts, which are generally composed of electrochemical active materials and various functional additives, have demonstrated extraordinary electrocatalytic performance toward HER and OER, and particularly a number of precious-metalfree heterostructures delivered comparable activity with precious-metal-based catalysts. Herein, an overview is presented of recent research progress on heterostructured HER catalysts. It starts with summarizing the fundamentals of HER and approaches for evaluating HER activity. Then, the design and synthesis of heterostructures, electrochemical performance, and the related mechanisms for performance enhancement are discussed. Finally, the future opportunities and challenges are highlighted for the development of heterostructured HER catalysts from the points of view of both fundamental understandings and practical applications.

show abstract

Pt/RuO₂-TiO₂Electrocatalysts Exhibit Excellent Hydrogen Evolution Activity in Alkaline Media

Cited by 23 publications

References 34 publications

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu₂O₃nanocomposites in a strong alkaline solution

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu₂O₃nanocomposites in a strong alkaline solution

Crystalline ZnO and ZnO / TiO ₂ nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H ₂ generation in alkaline electrolytes

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Contact Info

Product

Resources

About

Pt/RuO2-TiO2Electrocatalysts Exhibit Excellent Hydrogen Evolution Activity in Alkaline Media

Cited by 23 publications

References 34 publications

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu2O3nanocomposites in a strong alkaline solution

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu2O3nanocomposites in a strong alkaline solution

Crystalline ZnO and ZnO / TiO 2 nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H 2 generation in alkaline electrolytes

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Contact Info

Product

Resources

About

Pt/RuO₂-TiO₂Electrocatalysts Exhibit Excellent Hydrogen Evolution Activity in Alkaline Media

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu₂O₃nanocomposites in a strong alkaline solution

Enhanced hydrogen evolution reaction on highly stable titania‐supported PdO and Eu₂O₃nanocomposites in a strong alkaline solution

Crystalline ZnO and ZnO / TiO ₂ nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H ₂ generation in alkaline electrolytes