Strategies for Developing Transition Metal Phosphides in Electrochemical Water Splitting

Ying, Jie; Wang, Huan

doi:10.3389/fchem.2021.700020

Cited by 22 publications

(14 citation statements)

References 100 publications

(113 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The activity of Ni 2 P was validated experimentally by Schaak and Lewis in 2013, where Ni 2 P was found to exhibit a low overpotential and high stability (in acid) relative to other earth-abundant catalysts investigated . This spurred widespread investigation of transition-metal phosphides for first HER, and subsequently OER, and related reactions. − …”

Section: Introductionmentioning

confidence: 99%

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni_2–xRh_xP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

Batugedara

Brock

2022

Chem. Mater.

View full text Add to dashboard Cite

Transition-metal phosphides have proven to be surprisingly active electrocatalysts for electrochemical water splitting, but the nature of the "active" catalyst depends strongly on the solution pH, the identity of the metals, and whether the reactions are anodic [oxygen evolution reaction (OER)] or cathodic [hydrogen evolution reaction (HER)]. In order to understand the origin of this activity, the synthesis of well-defined, compositionally controlled precatalysts is needed, as are detailed catalytic studies and physicochemical characterization/activity assessment of catalysts at different stages. While base-metal phosphides of Ni and Co have the advantage of being earth-abundant, in alkaline media, they are less active and less stable than noble-metal phosphides such as Rh 2 P. As a means to combine the abundant nature of base metals with the activity and stability of noble metals, the first synthesis of colloidal Ni 2−x Rh x P nanocrystals by arrested precipitation routes is reported along with their composition-dependent activity for electrocatalytic HER and OER. Phase-pure samples of Ni 2−x Rh x P were realized at the Ni-rich (hexagonal, Fe 2 P-type) end (x = 0.00, 0.25, 0.50) and Rh-rich (cubic, antifluorite-type) end (x = 1.75, 2.00). When assessed in terms of current density normalized to electrochemical surface area (ECSA) at a fixed potential, the most active precatalyst for OER is Ni 1.75 Rh 0.25 P, and for HER, it is Rh 1.75 Ni 0.25 P. Evaluation of X-ray photoelectron spectroscopy, transmission electron microscopy/ energy-dispersive spectroscopy and ECSA data before and after 10 h stability runs were performed. The data reveal surface compositions to be considerably richer in Ni and poorer in Rh and P relative to the bulk composition, particularly for Ni 0.25 Rh 1.75 P, where the surface ratio of Ni/Rh is nearly 2:1 and increases to 4:1 after HER catalysis. In all cases, surface phosphorus is completely depleted post catalysis, suggesting a sacrificial role for phosphide under alkaline conditions. Moreover, the activity of "Rh 1.75 Ni 0.25 P" for HER decreases over time, even as the ECSA continues to rise, attributed to a decrease in the more active and stable Rh sites relative to Ni on the surface. In contrast, the enhancement in OER activity of Ni 2 P with 12.5% Rh incorporation is attributed to restructuring upon phase segregation of Rh, suggesting that the noble metal may also play a sacrificial role and not directly participate in OER catalysis. The roles of minority noble metals (Rh) in base-metal phosphides for OER and of minority base metals in noble-metal (Rh) phosphides for HER are discussed in light of related data on Co 2−x Rh x P.

show abstract

Section: Introductionmentioning

confidence: 99%

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni_2–xRh_xP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

Batugedara

Brock

2022

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…Amorphous materials with long-range disordered structures have exhibited superior electrocatalytic OER performance compared to their crystalline counterparts due to the following advantages ( Figure 1A ). First, the amorphous structure has a large number of active sites from rich dangling bonds and coordinatively unsaturated sites ( Ying and Wang, 2021 ). Next, the atomic composition can be controlled over a wide range, which makes it possible to find the optimal composition for the best activity ( Lemoine et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Recent advances in amorphous electrocatalysts for oxygen evolution reaction

2022

View full text Add to dashboard Cite

Oxygen evolution reaction (OER) has attracted great attention as an important half-reaction in the electrochemical splitting of water for green hydrogen production. However, the inadequacy of highly efficient and stable electrocatalysts has impeded the development of this technology. Amorphous materials with long-range disordered structures have exhibited superior electrocatalytic performance compared to their crystalline counterparts due to more active sites and higher structural flexibility. This review summarizes the preparation methods of amorphous materials involving oxides, hydroxide, phosphides, sulfides, and their composites, and introduces the recent progress of amorphous OER electrocatalysts in acidic and alkaline media. Finally, the existing challenges and future perspectives for amorphous electrocatalysts for OER are discussed. Therefore, we believe that this review will guide designing amorphous OER electrocatalysts with high performance for future energy applications.

show abstract

“…Great efforts have been made to search for noble-metal-free catalysts with high activity and durability. To date, transition metal dichalcogenides (TMDs) [ 6 ], metal phosphides [ 7 ], MXenes [ 8 ] and MOFs [ 9 , 10 ] have been explored as suitable alternatives of Pt for the hydrogen evolution reaction (HER). For example, non-noble metal-based compounds such as MoS 2 , WS 2 , CoS 2 , NiSe 2 , CoSe 2 [ 11 ], amorphous MoSx, VS 2 , CoP, Ni 2 P, FeP, WP, MoP|S, CoPS, NiP 1.93 Se 0.07 , and NiMo alloys have been studied as potential HER electrocatalysts [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Facile Design of Solution-Phase Based VS2 Multifunctional Electrode for Green Energy Harvesting and Storage

et al. 2022

View full text Add to dashboard Cite

This work reports the fabrication of vanadium sulfide (VS2) microflower via one-step solvo-/hydro-thermal process. The impact of ethylene glycol on the VS2 morphology and crystal structure as well as the ensuing influences on electrocatalytic hydrogen evolution reaction (HER) and supercapacitor performance are explored and compared with those of the VS2 obtained from the standard pure-aqueous and pure-ethylene glycol solvents. The optimized VS2 obtained from the ethylene glycol and water mixed solvents exhibits a highly ordered unique assembly of petals resulting a highly open microflower structure. The electrode based on the optimized VS2 exhibits a promising HER electrocatalysis in 0.5 M H2SO4 and 1 M KOH electrolytes, attaining a low overpotential of 161 and 197 mV, respectively, at 10 mA.cm−2 with a small Tafel slope 83 and 139 mVdec−1. In addition, the optimized VS2 based electrode exhibits an excellent electrochemical durability over 13 h. Furthermore, the superior VS2 electrode based symmetric supercapacitor delivers a specific capacitance of 139 Fg−1 at a discharging current density of 0.7 Ag−1 and exhibits an enhanced energy density of 15.63 Whkg−1 at a power density 0.304 kWkg−1. Notably, the device exhibits the capacity retention of 86.8% after 7000 charge/discharge cycles, demonstrating a high stability of the VS2 electrode.

show abstract

Strategies for Developing Transition Metal Phosphides in Electrochemical Water Splitting

Cited by 22 publications

References 100 publications

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni_2–xRh_xP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni_2–xRh_xP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

Recent advances in amorphous electrocatalysts for oxygen evolution reaction

A Facile Design of Solution-Phase Based VS2 Multifunctional Electrode for Green Energy Harvesting and Storage

Contact Info

Product

Resources

About

Strategies for Developing Transition Metal Phosphides in Electrochemical Water Splitting

Cited by 22 publications

References 100 publications

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni2–xRhxP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni2–xRhxP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

Recent advances in amorphous electrocatalysts for oxygen evolution reaction

A Facile Design of Solution-Phase Based VS2 Multifunctional Electrode for Green Energy Harvesting and Storage

Contact Info

Product

Resources

About

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni_2–xRh_xP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni_2–xRh_xP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media