Defects-engineered tailoring of tri-doped interlinked metal-free bifunctional catalyst with lower gibbs free energy of OER/HER intermediates for overall water splitting

Yasin, Ghulam; Ibraheem, Shumaila; Ali, Sajjad; Arif, Muhammad; Ibrahim, Sehrish; Iqbal, Rashid; Kumar, Anuj; Tabish, Mohammad; Mushtaq, Muhammad; Saad, Ali; Xu, Hu; Zhao, Wei

doi:10.1016/j.mtchem.2021.100634

Cited by 69 publications

(36 citation statements)

References 55 publications

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“…This finding can additionally affect the lower ORR activity of USP-Pt, and can particularly cause the registered higher ORR overpotentials of USP-Pt in comparison to Pt black. The limiting current of around 4.6 mA cm −2 that was found for USP-Pt is in accordance with the limiting currents ranging 4-6 mA cm −2 reported for various materials [4,5,8]. Namely, platinum-based hybrid materials Pt-Er@PC-900 and Pt-ErPCN-900, i.e., Pt/Er nanoparticles decorated on Cd-MOF derived hierarchical carbon, showed excellent ORR activity with a limiting current of 5.5 mA cm −2 while the limiting current of commercial Pt/C was 4.7 mA cm −2 [8].…”

Section: Galvanostatic Electrochemical Impedance Spectroscopy (Geis)supporting

confidence: 91%

“…The limiting current of around 4.6 mA cm −2 that was found for USP-Pt is in accordance with the limiting currents ranging 4-6 mA cm −2 reported for various materials [4,5,8]. Namely, platinum-based hybrid materials Pt-Er@PC-900 and Pt-ErPCN-900, i.e., Pt/Er nanoparticles decorated on Cd-MOF derived hierarchical carbon, showed excellent ORR activity with a limiting current of 5.5 mA cm −2 while the limiting current of commercial Pt/C was 4.7 mA cm −2 [8]. A new class of non-platinum electrocatalysts with high stability and activity in ORR was developed by Ibraheem et al [4,5].…”

Section: Galvanostatic Electrochemical Impedance Spectroscopy (Geis)supporting

confidence: 91%

“…The meeting point of FCs and M-O 2 (involving alkaline metal-air batteries, such as Li-O 2 and Na-O 2 ) clearly exists on the cathode side -in both FC and M-O 2 , the electrons for anodic oxidations are provided by ORR at the cathode [6]. Green technology progress not just in energy storage but in the water-splitting domain urges for controllable catalysts for both HER and OER [7,8]. New modifications of morphology and/or electronic structures of transition metal-based catalysts have offered multifunctional solutions in energy storage and conversion as well as in demanded water electrolysis applications [9].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Defined Pt Particles Prepared by Ultrasonic Spray Pyrolysis for One-Step Synthesis of Supported ORR Composite Catalysts

Alkan

Košević

Mihailović

et al. 2022

Metals

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Polygonal Pt nanoparticles were synthesized using ultrasonic spray pyrolysis (USP) at different precursor concentrations. Physicochemical analysis of the synthesized Pt particles involved thermogravimetric, microscopic, electron diffractive, and light absorptive/refractive characteristics. Electrochemical properties and activity in the oxygen reduction reaction (ORR) of the prepared material were compared to commercial Pt black. Registered electrochemical behavior is correlated to the structural properties of synthesized powders by impedance characteristics in ORR. The reported results confirmed that Pt nanoparticles of a characteristic and uniform size and shape, suitable for incorporation on the surfaces of interactive hosts as catalyst supports, were synthesized. It is found that USP-synthesized Pt involves larger particles than Pt black, with the size being slightly dependent on precursor concentration. Among ORR-active planes, the least active (111) structurally defined the synthesized particles. These two morphological and structural characteristics caused the USP-Pt to be made of lower Pt-intrinsic capacitive and redox currents, as well as of lower ORR activity. Although being of lower activity, USP-Pt is less sensitive to the rate of ORR current perturbations at higher overpotentials. This issue is assigned to less-compact catalyst layers and uniform particle size distribution, and consequently, of activity throughout the catalyst layer with respect to Pt black. These features are considered to positively affect catalyst stability and thus promote USP synthesis for improved properties of host-supported Pt catalysts.

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Section: Galvanostatic Electrochemical Impedance Spectroscopy (Geis)supporting

confidence: 91%

Section: Galvanostatic Electrochemical Impedance Spectroscopy (Geis)supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Defined Pt Particles Prepared by Ultrasonic Spray Pyrolysis for One-Step Synthesis of Supported ORR Composite Catalysts

Alkan

Košević

Mihailović

et al. 2022

Metals

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show abstract

“…Spin-polarized generalized gradient approximation (GGA) of Perdew, Burke, and Ernzerhof (PBE) was performed using Vienna Ab-initio Simulation Package (VASP). [49][50][51] Core electrons were treated with the projector augmented wave (PAW) method. [52] The energy cutoff was set as 520 eV for bulk calculation and 400 eV for surface calculation.…”

Section: Methodsmentioning

confidence: 99%

Understanding the Surface Reconstruction on Ternary W_xCoB_x for Water Oxidation and Zinc–Air Battery Applications

Gao

Ramière

Chu

et al. 2022

Small

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The catalysts used to decrease the overpotential for this reaction play a pivotal role in realizing these devices. [2] Currently, iridium (Ir) and ruthenium (Ru) based oxides have been used as efficient OER catalysts. However, the scarcity and price of these materials makes them unsuitable for large-scale applications such that they need to be replaced with low-cost nonprecious metal electrocatalysts. [3] Many transition metal-based materials are promising alternatives to promote OER in alkaline media. Among the earth-abundant elements, cobalt was found to be one of the best alternatives to replace noble metals for OER. Cobalt derivatives are widely investigated as OER catalysts, including their oxides, [4] nitrides, [5,6] selenides, [7] borides, [8] carbides, [9] and phosphides. [10] The surfaces of these materials are known to undergo in situ transformations at Co sites to form cobalt oxyhydroxide (CoOOH) under the electric potential applied during the water oxidation process. [11] This surface reconstruction process directly determines the final performance of the catalysts. For instance, Duan et al., reported the controllable anodic leaching of Cr in CoCr 2 O 4 by activating the pristine material at high potential, which enables the transformation of the inactive CoCr 2 O 4 spinel into a highly Here, the synthesis of a series of pure phase metal borides is reported, including WB, CoB, WCoB, and W 2 CoB 2 , and their surface reconstruction is studied under the electrochemical activation in alkaline solution. A cyclic voltammetric activation is found to enhance the activity of the CoB and W 2 CoB 2 precatalysts due to the transformation of their surfaces into the amorphous CoOOH layer with a thickness of 3-4 nm. However, such surface transformation does not happen on the WB and WCoB due to their superior structure stability under the applied voltage, highlighting the importance of metal components for the surface reconstruction process. It is found that, compared with CoB, the W 2 CoB 2 surface shows a quicker reconstruction with a larger active surface area due to the selective leaching of the W from its surface. In the meantime, the metallic W 2 CoB 2 core underneath the CoOOH layer shows a better promotion of its oxygen evolution reaction (OER) performance than CoB. Therefore, the ternary W 2 CoB 2 shows better OER performance than the CoB, as well as the WB and WCoB. It is also found that the mixture of W 2 CoB 2 with Pt/C as the catalysts in air electrode for rechargeable Zn-air battery (ZAB), shows better performance than the IrO 2 -Pt/C couple-based ZAB.

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“…In this connection, some competitive noble-metal-free electrocatalysts have been reported for enhanced HER performance. [7][8][9][10][11][12] Molybdenum disulfide (MoS 2 ) nanosheets are one of the emerging candidates to replace noble-metal-HER catalysts due to their low cost, remarkable performance, and excellent stability. [13][14][15] It is believed that HER active sites in intrinsic MoS 2 nanosheets are mostly located on exposed edges.…”

Section: Introductionmentioning

confidence: 99%

FeNi@N‐Doped Graphene Core–Shell Nanoparticles on Carbon Matrix Coupled with MoS₂ Nanosheets as a Competent Electrocatalyst for Efficient Hydrogen Evolution Reaction

Shah

Sayyar

et al. 2022

Adv Materials Inter

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Defects-engineered tailoring of tri-doped interlinked metal-free bifunctional catalyst with lower gibbs free energy of OER/HER intermediates for overall water splitting

Cited by 69 publications

References 55 publications

Characterization of Defined Pt Particles Prepared by Ultrasonic Spray Pyrolysis for One-Step Synthesis of Supported ORR Composite Catalysts

Characterization of Defined Pt Particles Prepared by Ultrasonic Spray Pyrolysis for One-Step Synthesis of Supported ORR Composite Catalysts

Understanding the Surface Reconstruction on Ternary W_xCoB_x for Water Oxidation and Zinc–Air Battery Applications

FeNi@N‐Doped Graphene Core–Shell Nanoparticles on Carbon Matrix Coupled with MoS₂ Nanosheets as a Competent Electrocatalyst for Efficient Hydrogen Evolution Reaction

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Defects-engineered tailoring of tri-doped interlinked metal-free bifunctional catalyst with lower gibbs free energy of OER/HER intermediates for overall water splitting

Cited by 69 publications

References 55 publications

Characterization of Defined Pt Particles Prepared by Ultrasonic Spray Pyrolysis for One-Step Synthesis of Supported ORR Composite Catalysts

Characterization of Defined Pt Particles Prepared by Ultrasonic Spray Pyrolysis for One-Step Synthesis of Supported ORR Composite Catalysts

Understanding the Surface Reconstruction on Ternary WxCoBx for Water Oxidation and Zinc–Air Battery Applications

FeNi@N‐Doped Graphene Core–Shell Nanoparticles on Carbon Matrix Coupled with MoS2 Nanosheets as a Competent Electrocatalyst for Efficient Hydrogen Evolution Reaction

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Product

Resources

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Understanding the Surface Reconstruction on Ternary W_xCoB_x for Water Oxidation and Zinc–Air Battery Applications

FeNi@N‐Doped Graphene Core–Shell Nanoparticles on Carbon Matrix Coupled with MoS₂ Nanosheets as a Competent Electrocatalyst for Efficient Hydrogen Evolution Reaction