Potentiostatic Deposition Research Articles

Electrodeposition of a Novel Ternary Fe–W–Zn Alloy: Tuning Corrosion Properties of Fe–W Based Alloys by Zn Addition

Herein, we report the electrodeposition of a novel ternary Fe–W–Zn alloy. Ternary alloys with compositions of Fe–(29.08–35.96 at.%) W–(1.73–8.16 at.%) Zn were prepared by potentiostatic deposition in citrate–ammonia aqueous solution equipped with an anode chamber. The electrodeposition behavior of the ternary Fe–W–Zn alloys and the effect of the Zn addition were analyzed by cyclic voltammetry and in situ electrochemical quartz crystal microbalance measurements. Ternary alloys with glossy appearances and smooth surface morphologies were fabricated, with a maximum current efficiency of approximately 43%. Incorporating Zn into the Fe–W alloy structure transformed the alloy structure into an amorphous-like nanocrystalline structure and refined the crystal size to a minimum of 1.45 nm. Potentiodynamic polarization test results showed that the corrosion resistance of the ternary Fe–W–Zn alloy with approximately 2 at.% Zn was distinctly improved compared to the binary Fe–W alloy, both in 1 M H2SO4 solution and neutral 3 mass% NaCl solution. Notably, the corrosion resistance was even better than Ni–W alloy in 1 M H2SO4 solution, with its unique passivation behavior. The incorporation of Zn was found to be effective for tuning the corrosion properties of Fe–W alloys.

Gamma-phase Zn-Ni alloy deposition by pulse-electroplating from a modified deep eutectic solution

This article describes the electroplating of ZnNi alloy from a modified deep eutectic solvent (DES), a mixture of choline chloride (ChCl) and ethylene glycol (EG) commonly known by its commercial name Ethaline. In this study the Ethaline was modified with propylene carbonate (PC) to decrease the solution viscosity. Boric acid was also used as an additive to improve surface finish and adhesion. The modifications were shown to increase the reduction rate of metal ions through improved mass transport and also to improve the quality of finish (morphology and interfacial adhesion) of the coating. We demonstrate that it is possible to produce dense, thick and adherent coatings of a γ-phase ZnNi alloy with 81–85% Zn on mild steel substrates using either potentiostatic deposition or controlled current pulse-plating techniques. Mild steel is a typical substrate for a sacrificial anti-corrosion coating used in many applications where the alloy serves to protect the steel from corrosion in harsh environments.

Pulsed electrodeposition of nanostructured polythiothene film for high-performance electrochromic devices

In this work, polythiothene (PT) films on indium tin oxide (ITO) substrate (PT-5/ITO, PT-10/ITO, PT-15/ITO, and PT-20/ITO) are prepared by pulsed electrodeposition, where + 1.5 V as the first square waveform pulse is applied to the cell for 5, 10, 15, and 20 s, respectively. These obtained electrodes are further assembled into the electrochromic devices (ECDs). We investigate the surface morphology, electrochemical properties of PT films, and EC performance of corresponding ECDs. The results indicate that PT films possess loose surface morphology, large surface area and high electrochemical activities. Among four kinds of films (PT-5, PT-10, PT-15 and PT-20), PT-10 film has the most uniform distribution of nanoparticles and smaller particle size. The EC properties of ECDs are significantly improved, which exhibits a large optical contrast, high coloration efficiency, short switching time, and stable cycling. The ECD based on PT-10/ITO (ECD-10) has the best EC performance, caused by the nanostructured morphology of PT-10 film that is most conducive to electron conduction, ion diffusion and migration. Compared with the ECD based on PT film obtained by potentiostatic deposition on ITO glass, the optical contrast of ECD-10 increases by 94% (17 → 33%), and its coloration efficiency increases by 88% (159 → 299 cm2/C). Among all ECDs, the response time of ECD-10 is the shortest, and its coloration and bleaching time are 1.12 and 0.80 s, respectively. This study suggests that pulsed electrodeposition might be a facile strategy for fabricating high-performance polymer-based ECDs.

Silver sulfide nanoparticles on MWCNTs stabilized by poloxamer: An enhanced electrochemical sensor for high sensitivity detection of 2,4,6-trinitrotoluene

In this manuscript, an electrochemical sensor modified with multi-walledcarbon nanotubes (MWCNTs) and silver sulfide (Ag2S) was prepared by means of potentiostatic deposition method for the detection of 2,4,6-trinitrotoluene. The poloxamer (Px) was then electrodeposition onto the surface of MWCNTs and Ag2S as a film-forming material to prevent the leakage of nanomaterial, to improve the stability of the modified electrode and then enhance the current signal, which contributed to the high sensitivity of the electrode. During the electrodeposition process, some influence factors, such as the deposition cycle number, deposition time, and applied potential of silver sulfide, and the deposition time and applied potential of Px have been inspected. Under optimal conditions, the obtained sensor showed good catalytic performance for the reduction reaction of 2,4,6-trinitrotoluene. The proposed sensor also exhibited excellent stability and reproducibility, providing a wide linear ranges from 0.22 to 15.4 μmol L-1 and a low detection limit of 3.23 nmol L-1 (S/N = 3). It also provides a satisfactory result when applied to the actual sample detection.

An in situ growth strategy of NiCo-MOF nanosheets with more activity sites for asymmetric supercapacitors

NiCo layered double hydroxides (LDHs) for supercapacitors have been studied by virtue of the high specific capacitance theoretical values. However, less active sites limit the further increase of their specific capacitances. Metal-organic framework (MOF), as a promising material, has attracted intense attention with enormous specific area and adjustable structure. Herein, a practical strategy was designed to improve the active sites of the binder-free electrode by potentiostatic deposition and soaking NiCo-LDHs in 2-methylimidazole for in situ growth of MOF. This layered NiCo-MOF was obtained at room temperature which can retain more active sites to enhance capacitive properties. In particular, the prepared layered NiCo-MOF obtained a superior capacitance (1289 F g−1 at 0.5 A g−1), along with a remarkable rate capability (767 F g−1 at 20 A g−1). In addition, the as-prepared asymmetric supercapacitor exhibited a maximum specific energy of 57.8 Wh kg−1 at 748.7 W kg−1 (at a working potential of 1.5 V), and it retained 71.40% capacitance after 6000 cycles. All of these findings suggest that this work gives a practical way to synthesize NiCo-MOF nanosheets, and it exhibits excellent prospect in further energy field.

Cation exchange behavior during the redox switching of poly (3,4-ethylenedioxythiophene) films

Poly (3,4-ethylenedioxythiophene), PEDOT, films were synthesized at room temperature by potentiodynamic and potentiostatic step deposition in aqueous solutions containing EDOT monomer and LiClO4. In some solutions, the effect of small amounts of sodium dodecylsulfate, SDS, on the polymerization rate of EDOT and on the stiffness of the obtained PEDOT film was studied. The obtained PEDOT films were transferred in aqueous solutions containing cations with different molar mass, such as H+, Li+, Na+, K+, and Cs+. The apparent molar masses of the exchanged species during potentiodynamic experiments were determined by in situ microgravimetry. These measurements underlined the importance of the electrolyte chosen for electropolymerization process. It is known that SDS anions can be trapped inside the polymer layer during electropolymerization, providing them with a cation exchange behavior. However, even if the PEDOT films were deposited from an electrolyte without SDS, they still acted as cation exchangers.

Pulse potentiostatic deposition of Fe[sbnd]Zn based intermetallic coatings and evaluation of its catalytic activity for hydrogen evolution reaction

The current study explores a novel method to obtain FeZn intermetallic coatings from an alkaline, pyrophosphate-based electrolyte, followed by exploration of its application as a catalyst for Hydrogen Evolution Reaction (HER). The deposited intermetallic exhibits appreciable adherence to the underlying Copper substrate with superior surface finish. Pulse potentiostatic deposition procedure has been employed to obtain the intermetallic deposits under pulse conditions: (A) −1.3 to −1.8 V and (B) −1.6 to −1.8 V at ~67 Hz frequency. Linear Sweep Voltammetry (LSV) provides an insight into the reduction mechanism of Fe and Zn-pyrophosphate complexes to Fe (0) and Zn (0) states. Voltage and current transients investigate the mechanism of the formation of the FeZn intermetallics. Electrochemical Impedance Spectroscopy (EIS) provides quantifiable information, which helps to understand the behavior of the electrolyte and metal-complex species during the electro-deposition process. X-ray Diffraction (XRD) studies and Rietveld refinement verify the formation of FeZn intermetallics with negligible amounts of elemental or solid solution phases for the coating deposited under Pulse condition A. One of the intermetallic coatings is seen to have a crushed petal-like morphology with high specific surface area. The coatings obtained from pulse conditions A and B exhibit a significantly high nano-hardness of 1.585 ± 0.257 and 2.602 ± 0.51 GPa, respectively. The coatings also exhibit appreciable scratch resistance under both constant and progressive loading conditions. Tafel plots indicate a slope of 249.6 and 242.5 mV/dec for coatings obtained from pulse conditions A and B, respectively. Both coatings show a significant change in their morphology after the catalysis study.

Insights on the electrodeposition mechanism of tungsten oxide into conducting polymers: Potentiostatic vs. potentiodynamic deposition

In this work we have investigated the electrochemical deposition of tungsten oxide into different conducting polymer films from the metastable acidic solution of isopolytungstate. Two different in the nature conducting polymer (CP) materials, namely, poly-3,4-ethylenedioxythiophene (PEDOT) and poly-3,4-ethylenedioxypyrrole (PEDOP) were used as electrode substrates for electrodeposition. Electrodeposition of tungsten oxide into freshly prepared conducting polymer films was performed by two electrochemical methods: potentiostatic and potentiodynamic. The electrochemical behavior of CP/WO3 composites, obtained with variation of synthesis conditions, was investigated by cyclic voltammetry in 0.5 M sulfuric acid. The comparison of electrochemical properties of composites allows to conclude on the mechanism of WO3 deposition. It was shown that precipitates of WO3 in CPs, electrodeposited by potentiodynamic method, display very symmetrical and sharp peaks of the redox transformation of WO3, which are rarely reported for tungsten oxides.The effect of electrochemical deposition method on the growth of WO3 precipitates on conducting polymer film electrodes and the electrochemical properties of composites was also investigated by combined cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The role of polyoxotungstate anion species trapping in CPs during p-doping process and facile formation of tungsten oxide nanostructures in CPs matrix is considered. A mechanism for the electrodeposition of tungsten oxide into PEDOT and PEDOP polymers was proposed.

Conductivity controlling of Cu2O film photoelectrode for water splitting by a novel electrochemical approach - Differential potentiostatic deposition

Cuprous oxide (Cu2O) is a kind of low-cost and promising material for water splitting to produce hydrogen (p-type Cu2O) and oxygen (n-type Cu2O). However, the reason of conductivity transforming from p-type to n-type for Cu2O films during potentiostatic deposition is waiting to be revealed. In this work, a novel electrochemical technology, differential potentiostatic deposition (DPD), is developed by coupling a 3-electrode setup with a resistor connected in series with the counter electrode circuit through a potentiostat. By this approach, deposition current density is adjusted in a short period to simulate different stages in a traditional potentiostatic deposition (TPD). The result shows that semiconducting conductivity of Cu2O film changes from p-type to n-type with time during a long-term TPD in basic CuSO4 solution. Employing the DPD method, conductivity of Cu2O film transforms from p-type to n-type with current density decreasing. Through characterizing thickness, composition and photoelectrochemical performance of Cu2O films, the mechanism of semiconducting conductivity transformation for Cu2O films is proposed. Besides, the results indicate that the DPD is an effective method to tune the conductivity of metal oxide photoelectrodes for water splitting.

Electropolymerized poly(3-methylthiophene) onto high density vertically aligned carbon nanotubes directly grown on aluminum substrate: Application to electrochemical capacitors

Potentiostatic pulsed deposition of poly(3-methylthiophene) (P3MT) is carried out on vertically aligned carbon nanotubes directly grown on aluminum foil (VACNT/Al) in a mixture of ionic liquid in acetonitrile (25/75 v/v) as electrolyte to prepare pseudo-capacitive materials for electrochemical capacitors. VACNT with high density (2.1011 VACNT/cm2) and anisotropy, have high specific surface area (340 m2/g) and serve as template electrode to nanostructure the P3MT coating. The effect of the polymer weight in the nanocomposite on the morphology and electrochemical properties of nanocomposite electrodes is investigated. Up to 70% of P3MT is electrodeposited inside the carpet onto the VACNTs as evidenced by Scanning Electronic Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDX). A specific capacitance of 170F/g was obtained for the optimal nanocomposite composition (70%). The calculated areal capacitance is 380 mF/cm2 and the volumetric capacitance is 76 F/cm3. In addition, nanostructured electrodes present an excellent stability and capacitance retention after 19,000 cycles. Finally, asymmetric electrochemical capacitors were assembled and specific energy of 52 Wh/kg (14 Wh/L) and a specific power of 10 kW/kg were obtained. A comparison with EDLC symmetric device highlights the role of P3MT to improve energy while maintaining a high power due to fast diffusion in the channels perpendicularly oriented to the substrate.

Investigation on the Electrochemical Behaviour and Deposition Mechanism of Neodymium in NdF3–LiF–Nd2O3 Melt on Mo Electrode

Neodymium was electrochemically deposited from NdF3–LiF–Nd2O3 molten salt electrolyte onto the Mo electrode at temperatures close to 1273 K. Cyclic voltammetry and chronoamperometry measurements were the applied electrochemical methods. Metallic neodymium is obtained by potentiostatic deposition. The optical microscopy and XRD were used to analyze the electrolyte, the working electrode surface, and the deposit on the electrode. It was established that Nd(III) ions were reduced to Nd metals in two steps: Nd(III) + e− → Nd(II) at potential ≈−0.55 V vs. W and Nd(II) + 2e− → Nd(0) at ≈−0.83 V vs. W. Both of these processes are reversible and under mass transfer control. Upon deposition under the regime of relatively small deposition overpotential of −0.10 V to −0.20 V, and after the electrolyte was cooled off, Nd metal was observed at the surface of the Mo electrode. CO and CF4 were gases registered as being evolved at the anode. CO and CF4 evolution were observed in quantities below 600 ppm and 10 ppm, respectively.

Improved stability of thin insulating poly(o-aminophenol) films in aqueous solutions through an efficient strategy for electrosynthesis under neutral pH conditions: Electrochemical and XPS investigation

The stability of non-conducting poly(o-aminophenol) films (PoAP), electrosynthesized on Pt substrates by cyclic voltammetry and chronoamperometry, was investigated through electrochemical tests, evaluating changes in permeability to potassium ferricyanide upon prolonged immersion in water solutions. PoAP growth potentiodynamically evidenced poorer stability despite the similar chemical composition, thickness and morphology as detected by XPS and AFM. The prolonged dipping in water caused a post synthesis oxidation of part of iminic functionalities to carbonyls and the removal of polymeric chains weakly bound. Such a removal was estimated by QCM to be about the 43% of the mass deposited by cyclic voltammetry and about the 12% of the mass deposited by chronoamperometry. Potentiostatic deposition was then selected and implemented to achieve an enhanced stability suitable for film practical application. The novel deposition procedure herein proposed is composed of three successive stages: film potentiostatic deposition for 40 min, immersion in water for 1 h, further potentiostatic deposition for 20 min. The major packing efficiency, testified by the higher degree of platinum covering, was responsible for the notable long-term stability. Film compactness was attributed to the intensification of inter-chain hydrogen bonds, mainly between aminic groups, mediated by water molecules trapped inside the polymer at a high extent. The notable stability, verified in pure water as well as in concentrated saline solutions, and the presence of carbonyl terminal groups on the outermost surface, evidenced by Angular Resolved XPS, encourage a future employment of PoAP as a sensor for biomolecules capture and as anticorrosive coating.

Structural Properties and Capacitive Performance of Cathodically Deposited Manganese Dioxide Film on Electrophoretically Deposited Reduced Graphene Oxide

The structural properties and capacitive behavior of manganese dioxide (MnO2) films prepared by potentiostatic cathodic deposition were examined in presence and absence of pre-electrophoretically deposited reduced graphene oxide (rGO) film. The FTIR analysis reflects the formation of a MnO2/rGO composite film structure. SEM and TEM characterization show that the MnO2 film deposited on rGO film has finer and less compact nanostructure and grown as sparsely aggregated particles follow the open structure of underlying rGO platelets. The specific capacitance and rate capability of MnO2/rGO film are higher than that of pristine MnO2 film; it exhibits specific capacitance of 292 Fg-1 at 1 mA cm-2 and better cyclic stability at 3 mA cm-2. The presence of 3D underlying defective rGO film creates an open structure with larger area, facilitates the electron transfer and access of the electrolyte ions through the surface of MnO2 film and hence offering the potential of the unique capacitive behavior.

The role of surfactants in induced electrodeposition of Zn–Mo layer from citrate solutions

The influence of various additives on the process of electrodeposition of Zn–Mo coatings from citrate solutions was examined. Potentiostatic deposition, Wavelength dispersive X-ray fluorescence (WDXRF), X-ray diffraction and micro-Raman spectroscopy were carried out to analyze the role surfactants of electrodeposition of Zn–Mo layers. Atomic force microscopy was applied to investigate the surface morphologies. The mechanism describing the action of surfactant during the co-deposition process of Zn–Mo has been proposed. It was found that the additive can adsorb specifically on the Inner Helmholtz Plane (IHPs) on the cathode and consequently limiting the approaching of other molecules (complexes) to the surface. Reduction processes are associated mainly with the formation and adsorption of zinc citrate complexes and mixed Zn(I)–Mo(VI)-citrate complexes those further reduce to metallic zinc and metallic zinc-molybdenum alloy (two hexagonal metallic phases). What is remarkable by hindering the reduction of the Zn(I)-citrate complex, the surfactant inhibits the reduction of zinc to metallic zinc and at the same time facilitates (catalyzes) the formation of the Zn(I)–Mo(VI)-citrate complex. The presence of only PEG 20000 in the bath causes deposition of one (Zn,Mo) hcp phase. While the presence in the bath of CTAB, Triton X-100 or D-sorbitol makes that two hcp phases can create: (Zn) and (Zn,Mo) or one hcp phase (Zn) and one oxide phase (MoO2).However, absence of surfactants or not optimal concentration of surfactants in the electrolyte and low ratio of concentrations of Zn(II) to Mo(VI) cause the reduction of molybdenum complexes only to molybdenum oxides which blocked the cathode surface, when in the case of greater ratio of concentrations of Zn(II) to Mo(VI) (increase the reduction rate of zinc citrate complexes in comparison to mixed Zn(I)–Mo(VI)-citrate complexes and molybdate citrate complexes ([(MoO4)H3cit]3-)) the metallic zinc, zinc oxides, and molybdenum oxides can co-deposit on the electrode surface (composite coatings of oxide nanoparticles dispersed within a zinc matrix).

Electrodeposition of tin-zinc-bismuth alloys from aqueous citrate-EDTA baths

Sn–Zn–Bi alloys layers were, for the first time, successfully produced by electrodeposition from stable and homogeneous aqueous electrolytes based on citric (Cit) and ethylenediaminetetraacetic (EDTA) acids. The optimal conditions for electrodeposition of Sn–Zn–Bi alloys from Cit-EDTA baths are in the narrow pH range of between 3.5 and 4.5. The possible process of the Bi(III) complexes reduction by Sn(II) complexes is inhibited by the specific structure of the Bi(III) complex with EDTA, which ensures the kinetic stability of the bath. Cyclic voltammetry with rotating disc electrode and construction of partial polarization curves, based on potentiostatic deposition in coulostatic conditions, allowed to determine the mechanism of co-deposition of Sn, Zn, and Bi. The achievable tin contents in the electrolytic layers are in the range of approx. 50 to 100 wt%, zinc in the range up to approx. 40 wt%, and bismuth in the range up to 12 wt%, with current efficiency of the electrodeposition process up to 95%.

Electrodeposition of superconducting rhenium-cobalt alloys from water-in-salt electrolytes

Electrodeposition of rhenium-cobalt (Re-Co) alloys is investigated in water-in-salt electrolyte with a superhigh concentration of lithium chloride. Cyclic and linear sweep voltammetries, potentiostatic deposition, and X-ray fluorescence spectroscopy are used to characterize the electrochemical deposition behavior of electrolytes and determine the deposition rates of each elements. Re deposition rate is enhanced in the presence of Co and a constant alloy composition is observed within a wide range of potential, both of which are explained with a partial ionic stabilization effect of Co on Re. A substitutional solid solution with hexagonal close pack structure is observed for ReCo alloys after annealing, where the lattice parameters linearly scale with the alloy compositions. The effect of Co alloying on the superconductivity of electrodeposited alloy films is also characterized down to 2 K.

A Cu2O/Cu/carbon cloth as a binder-free electrode for non-enzymatic glucose sensors with high performance

An electrode prepared via potentiostatic electrochemical deposition exhibits a 60 nM detection limit and a 1 linear range of 1 to 1555 μM.

Monodispersed MnOx-CeO2 solid solution as superior electrocatalyst for Li2S precipitation and conversion

The precipitation and conversion of Li2S are the main obstacles for practical applications of lithium-sulfur batteries, owing to the high interfacial energy barrier of the reactions and the passivation of catalysts during Li2S precipitation. A monodispersed MnOx-CeO2 solid solution nanoparticles grown on reduced graphene oxide (MnOx-CeO2@rGO) is designed as effective electrocatalyst to facilitate the precipitation and conversion of Li2S. Alien Mn atoms doping modulates the electronic structure of CeO2 matrix and induces more oxygen vacancies, which facilitates the adsorption of lithium polysulfides (LiPSs) and boots the intrinsic catalytic activity for Li2S nucleation. Moreover, the monodispersity of ultra-small MnOx-CeO2 nanoparticles can provide enough active facets for sufficient Li2S precipitation. To reveal the electrocatalytic effect of MnOx-CeO2@rGO on Li2S precipitation, mesoporous SiO2@rGO nanosheets with numerous polar surface for strong LiPSs adsorption is adopt as a reference. The results of potentiostatic discharge deposition indicates that MnOx-CeO2@rGO reduces the overpotential for the rapid Li2S precipitation, avoiding the accumulation of LiPSs on the active sites. Such features offer the cell with MnOx-CeO2@rGO coated separator an excellent high rate capacity (630 mAh g−1 at 3C) and long-term cyclic stability (capacity fading of 0.036% per cycle at 1C for 1000 cycles).

Photoelectrochemical study of electrochemically synthesized CdTe thin films from acetate-anion based ionic liquid bath

Potentiostatic deposition of CdTe thin films from acetate-anion based ionic liquid, 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]) bath has been carried out at 90 °C. A molar concentration ratio i.e. molar Cd/Te = 2 has been taken to electrochemically synthesize CdTe films under different dynamic conditions. FE-SEM showed the formation of homogeneous CdTe films over fluorine doped tin oxide (FTO) substrates. EDX revealed the formation of nearly stoichiometric CdTe films at optimal stirring rate of ∼400 rpm. The optical band gap of ∼1.45eV were observed with cubic zinc blende CdTe structure. XRD, RAMAN and XPS analysis confirmed the formation of pure CdTe phase with ultra-thin oxide over-layer. Photoelectrochemical studies of CdTe photoelectrodes prepared by electrodeposition technique was investigated in K2Sx and KH2PO4. Mott-Schottky analysis demonstrated the formation of p-CdTe with a flatband (Vfb) potential of ∼0.95VRHE. A high photocurrent density of 1.23 mA/cm2 has been achieved with solar conversion efficiency (ηc) of 1.50% for the pristine electrodeposited CdTe/FTO photocathode i.e. without surface modification, under chopped monochromatic illumination. This illustrates that the prepared CdTe photocathode can be a promising semiconductor candidate for application in photoelectrochemical hydrogen evolution from water. The use of acetate-anion based IL bath always resulted in p-type CdTe thin films.

Native Osseous CaP Biomineral Coating on a Biomimetic Multi-Spiked Connecting Scaffold Prototype for Cementless Resurfacing Arthroplasty Achieved by Combined Electrochemical Deposition.

The multi-spiked connecting scaffold (MSC-Scaffold) prototype with spikes mimicking the interdigitations of articular subchondral bone is an essential innovation in surgically initiated fixation of resurfacing arthroplasty (RA) endoprosthesis components. This paper aimed to present a determination of the suitable range of conditions for the calcium phosphate (CaP) potentiostatic electrochemical deposition (ECDV=const) on the MSC-Scaffold prototype spikes to achieve a biomineral coating with a native Ca/P ratio. The CaP ECDV=const process on the MSC-Scaffold Ti4Al6V pre-prototypes was investigated for potential VECDfrom −9 to −3 V, and followed by 48 h immersion in a simulated body fluid. An acid–alkaline pretreatment (AAT) was applied for a portion of the pre-prototypes. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) studies of deposited coatings together with coatings weight measurements were performed. Themost suitable VECD range, from −5.25 to −4.75 V, was determined as the native biomineral Ca/P ratio of coatings was achieved. AAT increases the weight of deposited coatings (44% for VECD = −5.25 V, 9% for VECD = −5.00 V and 15% for VECD = −4.75 V) and the coverage degree of the lateral spike surfaces (40% for VECD = −5.25 V, 14% for VECD = −5.00 V and 100% for VECD = −4.75 V). XRD confirmed that the multiphasic CaP coating containing crystalline octacalcium phosphate is produced on the lateral surface of the spikes of the MSC-Scaffold. ECDV=const preceded by AAT prevents micro-cracks on the bone-contacting surfaces of the MSC-Scaffold prototype, increases its spikes’ lateral surface coverage, and results in the best modification effect at VECD = −5.00 V. To conclude, the biomimetic MSC-Scaffold prototype with desired biomineral coating of native Ca/P ratio was obtained for cementless RA endoprostheses.