A unique amorphous cobalt-phosphide-boride bifunctional electrocatalyst for enhanced alkaline water-splitting

Chunduri, Avani; Gupta, Suraj; Bapat, O.; Bhide, Aniruddha; Fernandes, R.; Patel, Maulik; Bambole, Vaishali; Miotello, A.; Patel, N.

doi:10.1016/j.apcatb.2019.118051

Cited by 133 publications

(53 citation statements)

References 51 publications

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“…Here, P plays a crucial role in modifying the electronic structure of the base metal boride and facilitating HER. Patel and co‐workers found a unique interplay in Co–P–B catalyst where electrons were transferred from B to Co and Co to P, thereby modulating the electron density of Co for moderate H‐adsorption. Another report proposed a plausible reaction mechanism for HER on Co–B–P as schematically depicted in Figure d .…”

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 99%

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Gupta

Patel

Miotello

et al. 2019

Adv Funct Materials

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335

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Electrocatalytic water-splitting has gained a firm hold in the area of renewable hydrogen production owing to its integrative compatibility with intermittent energy sources. However, wide-scale implementation of this technology demands discovery of new electrode materials that strike a good balance between efficiency, stability, and cost. In the pool of inexpensive electrodes capable of catalyzing hydrogen and oxygen evolution reactions, metal borides/ borates have made a big splash in the last decade. However, the research in this family of electrocatalysts remains unorganized owing to the diversity of reports. This review summarizes the past and present research progress in metal borides/borates for electrocatalytic water-splitting. The fundamental reasons for electrochemical behavior in different metal borides/borates are highlighted here, also including some comments regarding erroneous practices in the performance evaluation of metal borides/borates. Various strategies used to enhance the electrocatalytic performance of metal borides/borates are discussed in detail. Different methods evolved over the years for the synthesis of metal borides/ borates are also discussed. Finally, an assessment of the commercial viability of metal borides/borates is made and future research directions are suggested. multimetal oxides, [18,19] layered double hydroxides, [20] oxyhydroxides, [21] and perovskites. [13,18] In addition to these, there has been the family of transition-metal borides/borates that have garnered enormous interest in the recent past. Though transition-metal borides (TMBs) have been used for water electrolysis since many decades, they were not really seen as potential candidates to replace noble metal catalysts, until recently. Indeed, in 2009, the group of Daniel Nocera reported in situ formed Co [22] and Ni [23] borates as analogous catalysts to Co phosphate, [24] for near-neutral water-splitting. Later, the groups of Hu [25] and Patel [26] reported development of Mo boride and Co boride, respectively, for electrocatalytic water splitting. Following these reports, transition-metal borides/ borates [27][28][29][30][31][32] were developed using various techniques and were used extensively for water-splitting reactions, in different pH solutions. Here, we would like to inform the readers that usually boron-based catalysts that are developed in situ using electrodeposition are referred to as "borates" (denoted as M-B i , M = metal) while those catalysts prepared by any other technique are referred to as "borides" (denoted as M-B). Over the past 5-6 years, a lot of studies have been carried out on borides/borates with remarkable results, presenting new possibilities in search for non-noble electrocatalysts. The electrochemical performance, stability and other important properties of all the metal borides reported so far are enlisted in Table 1 while that of metal borates are listed in Table 2. However, there are a lot of aspects that are not yet understood completely about borides/borates. For instance, the o...

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Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 99%

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Gupta

Patel

Miotello

et al. 2019

Adv Funct Materials

Self Cite

335

243

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“…η@10 mA cm À 2 [mV] NiFeO x /CFP [144] 320 CoÀ PÀ B [145] 410 Co/β-Mo 2 C@NÀ CNTs [146] 410 Ni/Mo 2 C(1 : 2)À NCNFs [147] 410 Co 0.6 Fe 0.4 P-1.125 [148] 340 Cr-doped FeNiÀ P [149] 270 CoÀ FeÀ BÀ P [150] 450 NiCo 2 S 4 [151] 350 CoPÀ N/Co foam [152] 380 (@ 50 mA cm À 2 ) CÀ CoP [153] 420 Ni 3 S 2 [154] 350 construct a new efficient platform for low-cost solar based water-splitting. In this regard, Luo et al demonstrated the use of state-of-art perovskites solar cells for water splitting.…”

Section: Catalystsmentioning

confidence: 99%

Recent Advances in Non‐Precious Metal‐Based Electrodes for Alkaline Water Electrolysis

Zhou

et al. 2020

ChemNanoMat

116

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Hydrogen gas has been regarded as an ideal energy source that could replace the need of fossil fuels, based on its high energy density with zero carbon emissions. The production of hydrogen via electrolysis of water is not a new field, but the technology has seen significant advancements in recent times, owing to the proportional growing demand of clean and affordable energy. This review discusses the most recent progresses achieved in the area of earth abundant catalysis, particularly, non‐precious metal (Ni, Co, Fe, Mo, W)‐based catalysts that are being utilized for the electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solutions. Based on the type of materials, the discussions are categorized into sections attributed to transition metal alloys, hydroxides, oxides, chalcogenides, carbides and nitrogenous materials. In general, a brief introduction of HER and OER mechanisms followed by a detailed discussion of the presently considered catalysts with endeavors have been made to highlight the new technologies and alternative approaches that are being considered promising towards production of clean H2 energy. Finally, a prospective has been provided to accentuate the future of non‐noble metal based catalyst in electro‐catalytic water splitting reactions.

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“…[26,27] Recently, metal compounds containing P and B together, herein termed as phospho-boride (PB), showed improved electrocatalytic rates, owing to their unique properties, which are different from either borides or phosphides. [28][29][30] For instance, in metal borides, B donates electrons to Co while in metal phosphides, Co donates electrons to P. This opposing electron transfer mechanism in metal borides and phosphides, when combined in a PB, generates metal sites with an optimal electronic density for interaction with reactants and products. [29][30][31] Although this characteristic of a single-metal PB is established, the synergistic effect created by presence of multi-metals in PBs has been seldom investigated.…”

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confidence: 99%

“…This shift represents the electron transfer towards P in CoÀ MoÀ PB, a consequence of the ensemble effect, [40] as also noticed in CoÀ P and CoÀ PB. [29] This interplay of electrons (from B to Co and Co to P) is an important phenomenon responsible for modulating the electron density over Co sites, facilitating the OER process. [29] Based on the surface atomic concentration (Table S1) obtained from XPS, CoÀ MoÀ PB can be chemically expressed as Co 0.62 Mo 0.02 P 0.07 B 0.29 .…”

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confidence: 99%

Alkaline Water Oxidation Using a Bimetallic Phospho‐Boride Electrocatalyst

et al. 2020

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New oxygen evolution reaction (OER) electrocatalysts based on low‐cost elements, which set new benchmark levels of activity, are vital if water electrolysis is to be applied on a global scale. Herein, a low‐cost bimetallic phospho‐boride catalyst was developed that showed outstanding OER activity of approximately 195 mV to achieve 10 mA cm−2 in alkaline water electrolysis, with a minimal catalyst loading of 0.3 mg cm−2. The contrasting electron transfer property of the metal borides and phosphides when combined in phospho‐boride modulated the electron density of the Co atom, yielding highly active CoOOH species at lower potentials. The addition of Mo at low levels further enhanced the activity by increasing the surface area and by formation of nano‐crystalline domains. The combined contributions from each of the components resulted in a new benchmark mass activity of 666 A g−1 at 300 mV overpotential. This work presents a new avenue towards fabricating electrode materials with exceptional performances.

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A unique amorphous cobalt-phosphide-boride bifunctional electrocatalyst for enhanced alkaline water-splitting

Cited by 133 publications

References 51 publications

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Recent Advances in Non‐Precious Metal‐Based Electrodes for Alkaline Water Electrolysis

Alkaline Water Oxidation Using a Bimetallic Phospho‐Boride Electrocatalyst

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