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Well-Defined Phase-Controlled Cobalt Phosphide Nanoparticles Encapsulated in Nitrogen-Doped Graphitized Carbon Shell with Enhanced Electrocatalytic Activity for Hydrogen Evolution Reaction at All-pH
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-25 00:00:00 , DOI: 10.1021/acssuschemeng.9b01263 Xianwei Lv 1, 2 , Jintao Ren 1 , Yansu Wang 1 , Yuping Liu 2 , Zhong-Yong Yuan 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-25 00:00:00 , DOI: 10.1021/acssuschemeng.9b01263 Xianwei Lv 1, 2 , Jintao Ren 1 , Yansu Wang 1 , Yuping Liu 2 , Zhong-Yong Yuan 1, 2
Affiliation
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Rational design and development of highly active, low-cost, and stable nonprecious metal electrocatalysts for hydrogen evolution reaction (HER) is extremely critical for making the water splitting process more economical and energy-saving. Herein, phase-controlled cobalt phosphide nanoparticles encapsulated in a nitrogen-doped graphitized carbon shell (termed Cox[email protected]) were prepared by hydrogen reduction of organic–inorganic cobalt phosphonate hybrid materials with different Co/P molar ratios. Compared with the synthesized pure-phase [email protected] and Co2[email protected], the hybrid-phase CoP/Co2[email protected] exhibits enhanced HER activity at all-pH values, affording low overpotentials of 126 mV (0.5 M H2SO4, pH = 0), 198 mV (1.0 M KOH, pH = 14), and 459 mV (1.0 M PBS, pH = 7) to achieve a current density of 10 mA cm–2. The high activity is ascribed to the doping of the N atom, enough accessible electrocatalytic active boundary sites, and synergistic interaction among the components, especially the electronic effect of CoP and Co2P. Additionally, the unique core–shell structure of CoP/Co2[email protected] efficiently prevents the agglomeration and corrosion of metallic cores during the HER and consequently endows it high stability and durability. This study not only offers us an efficient electrocatalyst for HER at all-pH but also opens a novel strategy to synthesize core–shell catalysts for various applications.
中文翻译：
定义明确的相控磷化钴纳米颗粒包裹在掺氮的石墨化碳壳中，具有增强的电催化活性，可在全pH条件下进行氢气分解反应
合理设计和开发用于氢气析出反应（HER）的高活性，低成本和稳定的非贵金属电催化剂，对于使分水过程更加经济和节能至关重要。在此，通过氢还原具有不同Co / P摩尔比的有机-无机膦酸钴杂化材料，制备了包裹在掺氮石墨化碳壳中的相控磷化钴纳米颗粒（称为Co x [受电子邮件保护]）。与合成的纯相[受电子邮件保护]和Co 2 [受电子邮件保护]相比，杂合CoP / Co 2 [受电子邮件保护]在所有pH值下均表现出增强的HER活性，提供了低的126 mV（0.5 MH）的超电势。2 SO4， pH = 0），198 mV（1.0 M KOH，pH = 14）和459 mV（1.0 M PBS，pH = 7）以实现10 mA cm –2的电流密度。高活性归因于N原子的掺杂，足够的可接近电催化活性边界位点以及各组分之间的协同相互作用，尤其是CoP和Co 2 P的电子效应。此外，CoP / Co的独特核-壳结构2 [电子邮件保护]有效地防止了HER期间金属芯的结块和腐蚀，因此赋予了其高稳定性和耐用性。这项研究不仅为我们提供了一种在全pH条件下用于HER的高效电催化剂，而且为合成用于各种应用的核-壳型催化剂开辟了新的策略。
更新日期：2019-03-25
中文翻译：
定义明确的相控磷化钴纳米颗粒包裹在掺氮的石墨化碳壳中，具有增强的电催化活性，可在全pH条件下进行氢气分解反应
合理设计和开发用于氢气析出反应（HER）的高活性，低成本和稳定的非贵金属电催化剂，对于使分水过程更加经济和节能至关重要。在此，通过氢还原具有不同Co / P摩尔比的有机-无机膦酸钴杂化材料，制备了包裹在掺氮石墨化碳壳中的相控磷化钴纳米颗粒（称为Co x [受电子邮件保护]）。与合成的纯相[受电子邮件保护]和Co 2 [受电子邮件保护]相比，杂合CoP / Co 2 [受电子邮件保护]在所有pH值下均表现出增强的HER活性，提供了低的126 mV（0.5 MH）的超电势。2 SO4， pH = 0），198 mV（1.0 M KOH，pH = 14）和459 mV（1.0 M PBS，pH = 7）以实现10 mA cm –2的电流密度。高活性归因于N原子的掺杂，足够的可接近电催化活性边界位点以及各组分之间的协同相互作用，尤其是CoP和Co 2 P的电子效应。此外，CoP / Co的独特核-壳结构2 [电子邮件保护]有效地防止了HER期间金属芯的结块和腐蚀，因此赋予了其高稳定性和耐用性。这项研究不仅为我们提供了一种在全pH条件下用于HER的高效电催化剂，而且为合成用于各种应用的核-壳型催化剂开辟了新的策略。
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