Improving the Antioxidation Capability of the Ni Catalyst by Carbon Shell Coating for Alkaline Hydrogen Oxidation Reaction

Gao, Yunfei; Peng, Hanqing; Wang, Ying‐Ming; Wang, Gongwei; Xiao, Li; Lu, Juntao

doi:10.1021/acsami.0c10784

Cited by 56 publications

(40 citation statements)

References 38 publications

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“…Considering this aspect, Cherevko and co-workers investigated the chemical and electrochemical stability of representative Ni-based catalysts including monometallic Ni and bimetallic Ni 3 M (M = Co, Fe, Cu, Mo) nanoparticles in alkaline electrolytes by using in situ and ex situ techniques. [136] As shown in Figure 13a,b, different behaviors are observed on the catalysts. More specifically, Mo was dissolved from Ni 3 Mo/C in the potential window at 0-0.3 V RHE , while the Cu in Ni 3 Cu/C was stable below E = 0.4 V versus RHE, but underwent noticeable electrochemical transient dissolution above this potential.…”

Section: Improvement Of the Chemical Stability Of Hor Catalystsmentioning

confidence: 93%

“…Increasing the anti-oxidation capability of Ni for the hydrogen oxidation reaction (HOR) is also considered by Zhuang and co-workers. [136] They synthesized a series of Ni@C catalysts by vacuum pyrolysis at different temperatures. The HOR tests show the Ni@C catalyst obtained at 500 °C exhibits the highest Ni utilization and the best HOR catalytic performance.…”

Section: Electronic Structure Controlmentioning

confidence: 99%

Section: The Aemfcs Performance Achievements With the Advanced Hor Catalystsmentioning

confidence: 99%

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Recent Advances in Electrocatalysts for Alkaline Hydrogen Oxidation Reaction

Zhao

Yue

et al. 2021

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Section: Improvement Of the Chemical Stability Of Hor Catalystsmentioning

confidence: 93%

Section: Electronic Structure Controlmentioning

confidence: 99%

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Recent Advances in Electrocatalysts for Alkaline Hydrogen Oxidation Reaction

Zhao

Yue

et al. 2021

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“…[ 83 ] Therefore, a major task is to preserve the metallic Ni sites so as to achieving long‐term durability. Surface coating is a simple but effective method to mitigating the surface oxidation of Ni under alkaline HOR condition as the metallic Ni surface does not directly contact with the alkaline solution; [ 98 ] however, the HOR process is also inhibited. On the other hand, it was demonstrated that the inner metallic core can activate the outer graphene layers via electronic interaction, [ 99 ] and hence the electrocatalytic activity is preserved.…”

Section: Non‐pgm Electrocatalysts For the Alkaline Hormentioning

confidence: 99%

Non‐Platinum Group Metal Electrocatalysts toward Efficient Hydrogen Oxidation Reaction

Zhao

Chen

Sun

et al. 2021

Adv Funct Materials

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Developing non‐platinum group metal (non‐PGM) electrocatalysts for the hydrogen oxidation reaction (HOR) represents the efforts towards the more economical use of hydrogen fuel cells and hydrogen energy, which has attracted tremendous attention recently. However, non‐PGM electrocatalysts for the HOR are still in their early development stages as compared with the significant advances in those for the oxygen reduction reaction and hydrogen evolution reaction. Herein, this paper summarizes the recent progresses and highlights the key challenges for the rational design of non‐PGM electrocatalysts, aiming to promote the development of non‐PGM HOR electrocatalysts. Fundamental understandings of the HOR mechanism are firstly reviewed, where theoretical interpretations on the low HOR kinetics in alkaline media, including the hydrogen binding energy theory, the bifunctional mechanism, and the water molecule reorganization, are particularly discussed. Subsequently, progresses of typical non‐PGM HOR electrocatalysts in acid and alkaline media are summarized separately. For the HOR under alkaline conditions, the superiorities and challenges of Ni‐based catalysts are discussed with a particular focus as they are the most promising non‐PGM electrocatalysts. Finally, this paper highlights the challenges and provide perspectives on the future development directions of non‐PGM HOR electrocatalysts.

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“…The h-BN shells help to maintain the active metallic Ni phase in both air and the electrolyte, and it also weakens the interactions of the O, H, and OH species with the Ni surface. Zhuang et al 118 synthesized the Ni@C catalysts by a vacuum pyrolysis method, and the antioxidation capability of Ni has been improved by the carbon shells. The graphitization degree of the carbon shells is the key factor affecting Ni utilization and its HOR activity.…”

Section: Nickel-based Catalystsmentioning

confidence: 99%

Cost-Effective Hydrogen Oxidation Reaction Catalysts for Hydroxide Exchange Membrane Fuel Cells

Xue¹,

Wang²,

Zhang³

et al. 2020

Acta Physico Chimica Sinica

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Fuel cells are clean, efficient energy conversion devices that produce electricity from chemical energy stored within fuels. The development of fuel cells has significantly progressed over the past decades. Specifically, polymer electrolyte fuel cells, which are representative of proton exchange membrane fuel cells (PEMFCs), exhibit high efficiency, high power density, and quick start-up times. However, the high cost of PEMFCs, partially from the Pt-based catalysts they employ, hinders their diverse applicability. Hydroxide exchange membrane fuel cells (HEMFCs), which are also known as alkaline polymer electrolyte fuel cells (APEFCs), alkaline anionexchange membrane fuel cells (AAEMFCs), anion exchange membrane fuel cells (AEMFCs), or alkaline membrane fuel cells (AMFCs), have attracted much attention because of their capability to use non-Pt electrocatalysts and inexpensive bipolar plates. The HEMFCs are structurally similar to PEMFCs but they use a polymer electrolyte that conducts hydroxide ions, thus providing an alkaline environment. However, the relatively sluggish kinetics of the hydrogen oxidation reaction (HOR) inhibit the practical application of HEMFCs. The anode catalyst loading needed for HEMFCs to achieve high cell performance is larger than that required for other fuel cells, which substantially increases the cost of HEMFCs. Therefore, low-cost, highly active, and stable HOR catalysts in the alkaline condition are greatly desired. Here, we review the recent achievements in developing such HOR catalysts. First, plausible HOR mechanisms are explored and HOR activity descriptors are summarized. The HOR processes are mainly controlled by the binding energy between hydrogen and the catalysts, but they may also be influenced by OH adsorption, interfacial water adsorption, and the potential of zero (free) charge. Next, experimental methods used to elevate HOR activities are introduced, followed by HOR catalysts reported in the literature, including Pt-, Ir-, Pd-, Ru-, and Ni-based catalysts, among others. HEMFC performances when employing various anode catalysts are then summarized, where HOR catalysts with platinum-group metals exhibited the highest HEMFC performance. Although the Ni-based HOR catalyst activity was higher than those of other non-precious metalbased catalysts, they showed unsatisfactory performance in HEMFCs. We further analyzed HEMFC performances while considering anode catalyst cost, where we found that this cost can be reduced by using recently developed, non-Pt HOR catalysts, especially Ru-based catalysts. In fact, an HEMFC using a Ru-based HOR catalyst showed an anode catalyst cost-based performance similar to that of PEMFCs, making the HEMFC promising for use in practical applications. Finally, we proposed routes for developing future HOR catalysts for HEMFCs.

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Improving the Antioxidation Capability of the Ni Catalyst by Carbon Shell Coating for Alkaline Hydrogen Oxidation Reaction

Cited by 56 publications

References 38 publications

Recent Advances in Electrocatalysts for Alkaline Hydrogen Oxidation Reaction

Recent Advances in Electrocatalysts for Alkaline Hydrogen Oxidation Reaction

Non‐Platinum Group Metal Electrocatalysts toward Efficient Hydrogen Oxidation Reaction

Cost-Effective Hydrogen Oxidation Reaction Catalysts for Hydroxide Exchange Membrane Fuel Cells

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