Dissolution Of Atoms Research Articles

Lattice-Doped Ir Cooperating with Surface-Anchored IrOx for Acidic Oxygen Evolution Reaction with Ultralow Ir Loading.

Reducing iridium (Ir) loading while maintaining efficiency and stability is crucial for the acidic oxygen evolution reaction (OER). In this study, we develop a synthetic method of sequential electrochemical deposition and high-temperature thermal shock to produce an IrOx/Ir-WO3 electrocatalyst with ∼1.75 nm IrOx nanoparticles anchoring on Ir-doped WO3 nanosheets. The IrOx/Ir-WO3 electrocatalyst with a low Ir loading of 0.035 mg cm-2 demonstrates a low overpotential of 239 mV to achieve a current density of 10 mA cm-2 and a mass activity of 6.6 × 104 A gIr-1 @1.75 V vs RHE in 0.5 M H2SO4. IrOx/Ir-WO3 on carbon paper as the anode and Pt/C as the cathode work stably for 40 h at 30 mA cm-2 in a proton exchange membrane water electrolyzer. It is found that the cooperation of lattice-doped Ir and surface-anchored IrOx enhances the activity and stability of IrOx/Ir-WO3 for acidic OER. Specifically, the doped Ir reduces the electron density of the anchored IrOx, thus optimizing the adsorption energy of oxygen-containing intermediates and the kinetic barrier of H2O dissociation, leading to an enhanced activity of IrOx/Ir-WO3. Also, the Ir-WO3 support provides electrons to retard the overoxidation and dissolution of Ir atoms from the anchored IrOx during acidic OER.

Ab Initio Molecular Dynamics Insights into Stress Corrosion Cracking and Dissolution of Metal Oxides

Oxide phases such as α-Fe2O3 (hematite) and α-Al2O3 (corundum) are highly insoluble in water; however, subcritical crack growth has been observed in humidity nonetheless. Chemically induced bond breaking at the crack tip appears unlikely due to sterically hindered molecular transport. The molecular mechanics of a crack in corundum with a reactive force field reveal minimal lattice trapping, leading to bond breaking before sufficient space opens for water transport. To address this, we model a pre-built blunt crack with space for H2O molecule adsorption at the tip and show that it reduces fracture toughness by lowering the critical J-integral. Then, we explore stress-enhanced dissolution to understand the mechanism of crack tip blunting in the oxide/water system. Density functional theory combined with metadynamics was employed to describe atomic dissolution from flat hematite and corundum surfaces in pure water. Strain accelerates dissolution, stabilizing intermediate states with broken bonds before full atom detachment, while the free energy profile of unstrained surfaces is almost monotonic. The atomistic calculations provided input for a kinetic model, predicting the shape evolution of a blunt crack tip, which displays three distinct regimes: (i) dissolution primarily away from the tip, (ii) enhanced blunting near but not at the apex, and (iii) sharpening near the apex. The transition between regimes occurs at a low strain, highlighting the critical role of water in the subcritical crack growth of oxide scales, with dissolution as the fundamental microscopic mechanism behind this process.

Transport of lithium droplets between two nonparallel iron plates: A molecular dynamics study

The use of bionic structures for the efficient and passive directional transportation of liquid droplets is crucial in numerous industrial applications. Compared with conventional fluids, liquid metals are stable under a wide range of environmental conditions owing to their excellent physicochemical properties. However, the directional transportation of liquid metals remains challenging. Herein, inspired by the pecking feeding mode of shorebirds, we performed a series of systematic molecular dynamics simulations to study the directional transport of liquid lithium (Li) between non-parallel iron (Fe) plates. The simulations demonstrate that cyclically closing and opening the Fe plates induces the movement of Li droplets toward the tip of the beak-shaped plate. Increasing the opening angle and applying a positive strain of the Fe plates can increase the transport velocity of the Li droplets. Nevertheless, the dissolution of Fe atoms in the liquid Li due to corrosion hinders the transportation of Li droplet across the Fe plate. We simulated the impact of two surface nanostructures on Li transport behavior and found that saw-tooth nanostructures decrease transport efficiency and lead to droplet breakup, whereas nanogrooves improve transport capacity by promoting the capillary effect. This work indicates that understanding the mechanism and influencing factors of liquid Li transport between non-parallel plates is essential for the design of bionic structures for the efficient transport of liquid metals.

Utilizing reconstruction achieves ultrastable water electrolysis

The dissolution of active atoms under operating potential will lead to a decline in their oxygen evolution reaction (OER) performance, thus preventing the current highly active catalysts from being practically applicable in industrial water electrolysis. Here, we propose a sequential leaching strategy to utilize the dynamic restructuring and enhance the chemical bond strength for highly active and stable OER. Modeling on nickel-iron sulfides (NiFe-S), we introduced and utilized foreign Mo dopant preleaching as the sacrificial agent to alleviate the oxidation corrosion of partial M─S bonds. Operando spectroscopic reveal that foreign Mo dopant leach from the matrix and then adsorb on the surface of NiFe O(S)OH as molybdate at lower OER potential. The crystal occupation hamiltonian population analysis uncovers that the charge transfer from molybdate into NiFe O(S)OH will enhance bond energy of M─S, thus preventing further S and Fe/Ni leaching. By manipulating ion leaching, the resulting active phase achieves an ultralow overpotential of 250 mV at 400 mA cm −2 and high stability of more than 3,700 h at 100 mA cm −2 . An industrial water electrolysis equipment using our catalysts delivered ultralow energy consumption of 4.30 kWh m −3 H2 and record stability over 250 h (2,300 h lifetime by epitaxial method with 10% attenuation) under a high working current of 8,000 mA. The hydrogen production cost of US$2.46/kg H2 aligns with the green hydrogen cost target set by the European Commission for the coming decade.

Metal Nitride Controlled Atomic Doping of Mox+ in NiFe (Oxy)Hydroxide to Trigger Lattice Oxygen‐Mediated Mechanism for Superior Oxygen Evolution

AbstractThe covalency of the metal─oxygen (M─O) bond is significantly amplified in the transition metal sites with elevated oxidation states, thereby enabling the lattice oxygen‐mediated mechanism (LOM) to transcend the traditional linear scaling limitations of the oxygen evolution reaction (OER). Here, an innovative surface atom release speed‐mediated doping of Mo atoms in NiFe (oxy)hydroxides by controlled dissolution of Mo atoms from the Mo2N surface, which resulted in the formation of NiFeMo(OH)2 with high valence Ni species for OER. Structural characterizations, coupled with in situ Raman and theoretical calculations, elucidate that the incorporation of Mo in NiFeMo(OH)2 modulates the electronic configuration of the metal centers, thereby diminishing the formation energy of Ni 3+/4+ species. This modulation augments the M─O bond covalency, facilitating a shift in the OER pathway from the conventional absorbate evolution mechanism to the more efficient LOM. Consequently, the NiFeMo(OH)2 displays a low overpotential of 236 mV at a current density of 10 mA cm−2, along with long stability (>500 h) at 50 mA cm−2. Furthermore, when integrated into an anion exchange membrane water electrolyzer, it achieves a current density of 1.0 A cm−2 at a cell voltage of merely 2.27 V, underscoring its potential for practical applications.

Introducing yttrium into Pt-based intermetallic compounds induce electron perturbation and anti-oxidation for enhancing oxygen reduction activity and durability

Pt-based intermetallic compounds (IMCs) as competitive electrocatalysts for oxygen reduction reaction (ORR) still face problems of surface oxidation and transition metal (M) dissolution in harsh electrochemical environments. Here, we report a strategy to induce electronic perturbation in IMCs by introducing yttrium (Y) to further regulate Pt d-band filling and alloy stability, and Y-doped PtCo IMCs supported on π-electron-rich nitrogen-doped porous carbon (Y-PtCo/NPPC) are presented as a proof of concept. X-ray absorption fine structure (XAFS) reveals that the introduced Pt-O-Y configuration in PtCo IMCs allows the Pt 5d orbital occupancy to be increased, which enhances the anti-oxidation ability of Pt atoms and further stabilizes the internal Co atoms. Y-PtCo/NPPC exhibits satisfactory ORR activity with a high mass activity (MA) of 1.89 A mgPt-1 and is much higher than that of the Pt/C catalyst (0.19 A mgPt-1). In particular, the MA retention of up to 84.7 % is maintained after 30,000 cycles accelerated durability test (ADT), and the Co atom dissolution ratio decreased by 6.4 times compared to PtCo/NPPC. Impressively, the Y-PtCo/NPPC catalyst achieves a high peak power density (1.0 W cm−2) in proton exchange membrane fuel cell (PEMFC) (H2-air). Theoretical calculations have also demonstrated that the introduction of Y element shifts Pt d-band downward, weakening the adsorption of oxygen-containing intermediates. The improved stability stems from the enhancement of the vacancy formation energies of Pt and Co.

Enhancement of the quality of mc-Si ingot grown by vacuum directional solidification furnace with growth rate increase reducing the cost of the wafer for PV application: Carbon and oxygen analysis

In this paper, we propose a numerical model to investigate the dissolution of oxygen atoms from the porous silica crucible, SiO gas formation, back diffusion of CO gas and segregation of carbon and oxygen during the growth of multi-crystalline silicon (mc-Si) by vacuum directional solidification (VDS) at different growth rates (3, 6 and 9 mm/h) by silt valve opening rate. The dissolution of oxygen decreases during the rapid growth of ingot because the reaction between the molten silicon and the porous silica crucible is constrained. This limitation on oxygen dissolution from the porous silica crucible further diminishes chemical reaction inside the VDS furnace. Consequently, the segregation pattern of the carbon and oxygen is affected at higher growth rate. During the VDS mc-Si growth, a growth rate of 9mm/h yields better quality of the VDS grown mc-Si ingots compared to other growth rates, this rate reduces SiC precipitation and SiO2 cluster formation due to lower concentration of carbon and oxygen. The obtained carbon concentration minimizes the wire saw defects. Based on these numerical results (9 mm/h), we have implemented experimental work. Prepared samples are analyzed using FTIR spectra and minority carrier lifetime measurements. The effect of oxygen concentration in the samples is analyzed in the minority carrier lifetime measurements. The oxygen and carbon concentrations are calculated by FTIR spectra and their results are compared with the numerical simulation.

The interstitial Ru dopant induces abundant Ni(Fe)[sbnd]Ru cooperative sites to promote ampere-level current density for overall water splitting

Directionally induced interstitial Ru dopant rather than ordinary substitutional doping is a challenge. Furthermore, DFT calculations revealed that compared with the substituted Ru dopants, the interstitial Ru dopants induce abundant Ni(Fe)Ru cooperative sites, greatly expediting the reaction kinetics for HER and OER. Inspired by these, the interstitial Ru-doped NiFeP/NF electrode is constructed by the ’quenching doped Ru-phosphorization’ strategy. Relevant physical characterizations confirmed that interstitial Ru dopants promote electron reset in the Ni(Fe)Ru synergistic sites, effectively avoiding metal atom dissolution and encouraging more Ni (Fe)OOH active species. As expected, the Ru-NiFeP/NF||Ru-NiFeP/NF electrolyzer only need as low as 1.54 V to yield a current density of 1 A cm−2. In summary, this work innovatively constructs the phosphide electrode with ampere-level current density from the perspective of regulating the doping position of Ru. This provides a new design idea for optimizing the Ru doping strategy.

Revealing the Reaction Pathway of Anodic Hydrogen Evolution at Magnesium Surfaces in Aqueous Electrolytes.

Aqueous metal corrosion is a major economic concern in modern society. A phenomenon that has puzzled generations of scientists in this field is the so-called anomalous hydrogen evolution: the violent dissolution of magnesium under electron-deficient (anodic) conditions, accompanied by strong hydrogen evolution and a key mechanism hampering Mg technology. Experimental studies have indicated the presence of univalent Mg+ in solution, but these findings have been largely ignored because they defy our common chemical understanding and evaded direct experimental observation. Using recent advances in the ab initio description of solid-liquid electrochemical interfaces under controlled potential conditions, we describe the full reaction path of Mg atom dissolution from a kinked Mg surface under anodic conditions. Our study reveals the formation of a solvated [Mg2+(OH)-]+ ion complex, challenging the conventional assumption of Mg2+ ion formation. This insight provides an intuitive explanation for the postulated presence of (Coulombically) univalent Mg+ ions, and the absence of protective oxide/hydroxide layers normally formed under anodic/oxidizing conditions. The discovery of this unexpected and unconventional reaction mechanism is crucial for identifying new strategies for corrosion prevention and can be transferred to other metals.

Achieving Highly Durable Intermetallic PtMn3N Electrocatalyst via the Strong Metal‐N Bonds toward Oxygen Reduction Reaction

AbstractPt‐based intermetallic compounds have been considered promising electrocatalysts in the practical applications of fuel cells; however, the development of Pt‐based catalysts that meet performance targets of high activity, maximized stability, and low cost remains a huge challenge. Herein, an atomically ordered and low‐Pt intermetallic nitride (PtMn3N) catalyst are synthesized consisting of a strained Pt shell and PtMn3N core on carbon support via the KCl‐matrix protection strategy. The PtMn3N catalyst represents a high mass activity of 0.70 A mgPt−1 at 0.9 V and a specific activity degradation of 4.2% after 5000 potential cycles for the oxygen reduction reaction (ORR) in rotating disk electrode (RDE) testing, which substantially outperformed commercial Pt/C (0.25 A mgPt−1 and 17.4%). Density functional theory calculations reveal that the introduction of Mn elements to the Pt lattice is beneficial to produce appropriate compressive strain to weaken the binding energy of oxygen species and the introduction of N elements to promote the strong metal‐N interactions is conducive to alleviating the dissolution of metal atoms, allowing for displaying the prominent durability. This work provides an effective strategy of N‐doped Pt‐based intermetallic compounds to enhance the corrosion resistance of 3d transition metals and to enhance the ORR performance.

An Electrostripping Strategy for Constructing a 3D Honeycomb‐Like Zn Anode Toward Dendrite‐Free Zinc‐Ion Batteries

AbstractThe severe dendrite issue of the Zn anode greatly hinders the practical application of aqueous zinc‐ion batteries, which demands a prompt solution. This work proposes an electrostripping strategy using sodium citrate (SC) solution as the electrolyte to fabricate a 3D honeycomb‐like Zn (3DH‐Zn) anode. Theoretical calculations and experimental results reveal that SC preferentially adsorbs on the Zn(100) and Zn(101) planes and exhibits a shielding effect, leading to the major dissolution of Zn atoms from the Zn(002) plane, thus obtaining a honeycomb‐like structure. Notably, convinced by morphology characterization and finite element simulation results, Zn2+ tends to deposit on the lateral sides of the hexagonal holes on the 3DH‐Zn anode, resulting in a flat deposition morphology dominated by Zn(101)/Zn(100) planes, which significantly inhibits dendrite formation. As a result, the 3DH‐Zn symmetric cell achieves an ultra‐long lifespan of 2000 h at 5.0 mA cm−2 and 1.0 mAh cm−2. Besides, the 3DH‐Zn||VO2 full cell works for 1000 cycles at 1.0 A g−1 with a residual capacity of 123.1 mAh g−1. This work opens up a new horizon for applying electrostripping strategy in designing advanced Zn anode.

Corrosion resistance and electrochemical migration behavior of InSnBiAgxZn low-melting-point alloy solders

With the ongoing advancements and innovations of electronic device, the demand for low-melting-point solder is rising, especially for flexible printed electronics. The service environments of electronic device are complex and diverse, which have raised concerns regarding long-term service reliability in solder materials. In this work, a novel type of 30In33Sn25Bi4AgxZn low-melting-point alloy solder was proposed. The effects of Zn content on the corrosion resistance and electrochemical migration (ECM) resistance of the alloy system were investigated through electrochemical test and water drop test (WDT). The passivation film on the surface and the amorphous region of InSnBiAg8Zn alloys effectively inhibits the anodic dissolution of Zn atoms, improves the corrosion resistance of the alloy and delays the occurrence of electrochemical migration failure. The microscopic mechanism of ECM was revealed by conducting in-situ observations of the migration process of the alloy solder and analyzing the composition and morphology of the anode alloy and the migration products.

Influence essential of current on electrochemical plasticization of single-crystal copper

Despite the long-standing identification of electrochemical plasticization (EP) in the metal surface layer, the mechanisms governing the impact of electric current density on EP remain incompletely understood. This study investigates the effect of current density (ranging from 0 mA cm−2 to 10.0 mA cm−2) on EP during electrochemical cold drawing of single-crystal copper in a 0.35 mol L−1 dilute H2SO4 electrolyte through microstructural characterizations and reactive force field molecular dynamic simulations. The results indicate that with increasing density, more atoms in the high-energy {110} and {001} planes in the copper surface are selectively dissolved, causing the atoms in the low-energy uncorroded {111} planes to become more loosened. This activates more abundant dislocations in a multi-slip way, thereby facilitating dislocation entanglements to reconfigure into movable short-range wavy dislocations and decreasing dislocation density through reactions, ultimately resulting in improved EP. However, when the density exceeds 6.7 mA cm–2, an opposite effect is observed due to the dissolution of fewer atoms resulting from enhanced local passivation.

Superior activity and durability of Co3Mo correlated with interfacial microenvironment for hydrogen evolution

Interfacial microenvironment is critical for the effective matching of catalyst and electrolyte. In this work, interfacial microenvironment is modulated to simultaneously improve catalytic activity and durability of Co3Mo. The dissolution of Mo atoms in Co3Mo during HER produces MoO42-, which can be further dimerized into Mo2O72- at high overpotential. Adsorption of Mo2O72- at the catalyst interface modulates the electronic structure of the surface active atoms, thereby reducing the Gibbs free energy required for HER. An optimal ratio of Mo2O72- with a critical MoO42- concentration of ∼13.4 mM in the electrolyte can make a positive contribution to catalytic activity, which is evidenced by ultralow overpotential of 78 mV at current density of 100 mA·cm−2. Meanwhile, almost no voltage increase is detected after 325 h at a current density of 0.5 A·cm−2 in an anion-exchange membrane electrolyzer. This investigation provides a strategic and scientific route for industrial electrolyzer based on Mo-based alloys.

Corrosion resistance of Nb and NbTi alloy predicted by hydrogen evolution reaction models modified with Langmuir isotherm adsorption theory

Langmuir isotherm adsorption theory is involved in the conventional model to predict the corrosion resistance of Nb and Nb alloys. It is illustrated that the anti-corrosion properties of Nb are dependent on the crystal plane, pH values and solution temperature. Nb(110) plane with the lowest Esurf/ρ and the highest Eesc present the slower dissolution of Nb atoms, and then exhibits the best anti-corrosion performance. Alloying with Cr, Cu, Mo, Ti and Ta destroys the stability of Nb(110) plane and thus degrades the corrosion resistance performances. Moreover, the anti-corrosion performance is improved with increasing pH values because of the decreasing coverage of H+ ions. The escape rate of Nb atoms will be accelerated at the elevating temperature, and thus the anti-corrosion performance be degraded. Therefore, an appropriate design of coating texture and solution environment could improve the anti-corrosion performances of bipolar plates.

Phase-Modified Strongly Coupled δ/ε-MnO2 Homojunction Cathode for Kinetics-Enhanced Zinc-Ion Batteries.

Rechargeable Zn-MnO2 batteries using mild water electrolytes have garnered significant interest owing to their impressive theoretical energy density and eco-friendly characteristics. However, MnO2 suffers from huge structural changes during the cycles, resulting in very poor stability at high charge-discharge depths. Briefly, the above problems are caused by slow kinetic processes and the dissolution of Mn atoms in the cycles. In this paper, a 2D homojunction electrode material (δ/ε-MnO2) based on δ-MnO2 and ε-MnO2 has been prepared by a two-step electrochemical deposition method. According to the DFT calculations, the charge transfer and bonding between interfaces result in the generation of electronic states near the Fermi surface, giving δ/ε-MnO2 a more continuous distribution of electron states and better conductivity, which is conducive to the rapid insertion/extraction of Zn2+ and H+. Moreover, the strongly coupled Mn-O-Mn interfacial bond can effectively impede dissolution of Mn atoms and thus maintain the structural integrity of δ/ε-MnO2 during the cycles. Accordingly, the δ/ε-MnO2 cathode exhibits high capacity (383 mAh g-1 at 0.1 A g-1), superior rate performance (150 mAh g-1 at 5 A g-1), and excellent cycling stability over 2000 cycles (91.3% at 3 A g-1). Profoundly, this unique homojunction provides a novel paradigm for reasonable selection of different components.

Surface atom knockout for the active site exposure of alloy catalyst

The fine regulation of catalysts by the atomic-level removal of inactive atoms can promote the active site exposure for performance enhancement, whereas suffering from the difficulty in controllably removing atoms using current micro/nano-scale material fabrication technologies. Here, we developed a surface atom knockout method to promote the active site exposure in an alloy catalyst. Taking Cu3Pd alloy as an example, it refers to assemble a battery using Cu3Pd and Zn as cathode and anode, the charge process of which proceeds at about 1.1 V, equal to the theoretical potential difference between Cu2+/Cu and Zn2+/Zn, suggesting the electricity-driven dissolution of Cu atoms. The precise knockout of Cu atoms is confirmed by the linear relationship between the amount of the removed Cu atoms and the battery cumulative specific capacity, which is attributed to the inherent atom-electron-capacity correspondence. We observed the surface atom knockout process at different stages and studied the evolution of the chemical environment. The alloy catalyst achieves a higher current density for oxygen reduction reaction compared to the original alloy and Pt/C. This work provides an atomic fabrication method for material synthesis and regulation toward the wide applications in catalysis, energy, and others.

Distance effect of single atoms on stability of cobalt oxide catalysts for acidic oxygen evolution

Developing efficient and economical electrocatalysts for acidic oxygen evolution reaction (OER) is essential for proton exchange membrane water electrolyzers (PEMWE). Cobalt oxides are considered promising non-precious OER catalysts due to their high activities. However, the severe dissolution of Co atoms in acid media leads to the collapse of crystal structure, which impedes their application in PEMWE. Here, we report that introducing acid-resistant Ir single atoms into the lattice of spinel cobalt oxides can significantly suppress the Co dissolution and keep them highly stable during the acidic OER process. Combining theoretical and experimental studies, we reveal that the stabilizing effect induced by Ir heteroatoms exhibits a strong dependence on the distance of adjacent Ir single atoms, where the OER stability of cobalt oxides continuously improves with decreasing the distance. When the distance reduces to about 0.6 nm, the spinel cobalt oxides present no obvious degradation over a 60-h stability test for acidic OER, suggesting potential for practical applications.

First‐principle screening of corrosion resistant solutes (Al, Zn, Y, Ce, and Mn) in Mg alloys for Integrated Computational Materials Engineering guided stainless Mg design

AbstractMg alloy suffers from its poor corrosion resistance as a result of anodic dissolution of Mg and hydrogen evolution reaction (HER) in humid environments. In this study, the effects of alloying elements (Al, Zn, Y, Ce, and Mn) on both processes in Mg alloys have been quantitatively predicted. Using first‐principle calculations, we first obtained the substitution energies of alloying elements to compare their segregation preference, and then analyzed the influence of solutes at different layers on the stability and hydrogen adsorption properties of Mg(0001) surface by calculating the formation enthalpy, surface energy, vacancy formation energy, work function, Bader charge, deformation charge density, and adsorption free energy of H atom. It has been found that, on the one hand, the interior Mn solute atoms reduce the dissolution of Mg atoms and the transfer of electrons, consequently slowing down the anodic dissolution process. On another hand, the Mn, Y, and Ce elements on the surface inhibit the cathodic HER process by elevating the absolute value of hydrogen adsorption free energy, as a result of those solutes effectively controlling H adsorption behavior on Mg(0001) surface. In contrast, all five elements dissolved inside the Mg grain do not show significant effects on the H adsorption behavior.

Assessing Pt and Ni dissolution mechanism and kinetics of shape-controlled oxygen reduction nanocatalysts

An electrochemical flow cell combined with inductively coupled plasma mass spectrometry (FC-ICP-MS) is a powerful tool to understand the mechanisms of metal dissolution and to develop mitigation strategies. Herein, we quantified in situ the amount of Pt and Ni atoms dissolved from PtNi/C nanocatalysts employed to electrocatalyze the oxygen reduction reaction (ORR) in proton-exchange membrane fuel cell cathode. The nanocatalysts feature similar crystallite size and Pt:Ni atomic ratio but different morphologies (spheres, octahedra, sponges). The FC-ICP-MS results reveal that the nanocatalyst morphology affects the dissolution rate of Pt and Ni but not the dissolution mechanism. They also provide analytical evidence that dissolution of Pt atoms is consistently accompanied by the dissolution of Ni atoms exceeding the stoichiometric composition. Furthermore, we demonstrate that ex situ acid leaching mitigates, but does not entirely prevent, the electrochemical dissolution of Ni atoms. Stabilized Pt and Ni dissolution rates were achieved after a one hour long accelerated stress test (AST). We provide evidence that the Pt dissolution rate remains constant before and after the AST. In contrast, the dissolution rate of Ni decreases by a factor of 10 following the AST. Among various nanoparticle shapes, spherical PtNi/C nanoparticles offer the best solution regarding the Pt and Ni retention compared to other nanoparticle shapes.