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2D hydrogenated boride as a reductant and stabilizer for in situ synthesis of ultrafine and surfactant-free carbon supported noble metal electrocatalysts with enhanced activity and stability
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-19 , DOI: 10.1039/d0ta06542k Saisai Gao 1, 2, 3, 4, 5 , Yang Zhang 1, 2, 3, 4, 5 , Jinglei Bi 1, 2, 3, 4, 5 , Bin Wang 1, 2, 3, 4, 5 , Chao Li 5, 6, 7, 8 , Jiamei Liu 5, 6, 7, 8 , Chuncai Kong 1, 2, 3, 4, 5 , Sen Yang 1, 2, 3, 4, 5 , Shengchun Yang 1, 2, 3, 4, 5
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-19 , DOI: 10.1039/d0ta06542k Saisai Gao 1, 2, 3, 4, 5 , Yang Zhang 1, 2, 3, 4, 5 , Jinglei Bi 1, 2, 3, 4, 5 , Bin Wang 1, 2, 3, 4, 5 , Chao Li 5, 6, 7, 8 , Jiamei Liu 5, 6, 7, 8 , Chuncai Kong 1, 2, 3, 4, 5 , Sen Yang 1, 2, 3, 4, 5 , Shengchun Yang 1, 2, 3, 4, 5
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The common problems with carbon-supported noble metal catalysts, which are the most widely used catalysts in scientific and commercial cases, are their poor dispersion and stability, and the large particle size of the noble metal. Herein, we uncover the reducibility of 2D hydrogenated boride (HB) towards noble metal ions, such as Pt,Cl42−, PdCl42− and AuCl4−, for synthesizing ultrafine and surfactant-free noble metal nanoparticles. Furthermore, inspired by these results, carbon supported noble metal nanoparticle electrocatalysts (M/B–C, M = Pt, Pd and Au) with an ultrafine size (2–3 nm) and a high dispersion were prepared using a simple mixing-stirring-filtering (MSF) method at room temperature, and the amount of noble metal loading reached as high as 52.9 wt%. There are no organic surfactants or other reductants involved in the entire preparation process. In light of the ultrafine size and clean surface, the M/B–C catalysts exhibit an activity that surpasses that of their commercial counterparts. The theoretical calculations indicate that the as-formed noble metal nanoparticles (NPs) present a much stronger interaction with the HB hydrolysate, that is, a 2D boron sheet, than that with carbon black, contributing to the excellent catalytic durability of M/B–C. This work provides a novel strategy for synthesizing carbon-supported noble metal electrocatalysts with an enhanced activity and durability.
中文翻译：
二维氢化硼化物作为还原剂和稳定剂，用于原位合成具有增强的活性和稳定性的超细和无表面活性剂的碳载贵金属电催化剂
碳负载的贵金属催化剂的常见问题是它们的分散性和稳定性差以及贵金属的粒径大，这是在科学和商业情况下使用最广泛的催化剂。在此，我们揭开2D的还原性氢化硼化物（HB）朝向贵金属离子，如Pt，氯4 2-，的PdCl 4 2-和AUCL 4 -，用于合成超细和不含表面活性剂的贵金属纳米粒子。此外，受这些结果的启发，使用简单的混合搅拌制备了碳负载的贵金属纳米粒子电催化剂（M / B–C，M = Pt，Pd和Au），具有超细尺寸（2-3 nm）和高分散性。在室温下进行过滤（MSF）方法，贵金属负载量高达52.9重量％。在整个制备过程中不涉及有机表面活性剂或其他还原剂。鉴于其超细的尺寸和清洁的表面，M / B–C催化剂的活性超过其商业同类产品。理论计算表明，形成的贵金属纳米颗粒（NPs）与HB水解产物（即2D硼片）的相互作用比与炭黑的相互作用强得多，有助于M / B–C出色的催化耐久性。这项工作为合成具有增强的活性和耐久性的碳载贵金属电催化剂提供了一种新颖的策略。
更新日期：2020-09-22
中文翻译：
二维氢化硼化物作为还原剂和稳定剂，用于原位合成具有增强的活性和稳定性的超细和无表面活性剂的碳载贵金属电催化剂
碳负载的贵金属催化剂的常见问题是它们的分散性和稳定性差以及贵金属的粒径大，这是在科学和商业情况下使用最广泛的催化剂。在此，我们揭开2D的还原性氢化硼化物（HB）朝向贵金属离子，如Pt，氯4 2-，的PdCl 4 2-和AUCL 4 -，用于合成超细和不含表面活性剂的贵金属纳米粒子。此外，受这些结果的启发，使用简单的混合搅拌制备了碳负载的贵金属纳米粒子电催化剂（M / B–C，M = Pt，Pd和Au），具有超细尺寸（2-3 nm）和高分散性。在室温下进行过滤（MSF）方法，贵金属负载量高达52.9重量％。在整个制备过程中不涉及有机表面活性剂或其他还原剂。鉴于其超细的尺寸和清洁的表面，M / B–C催化剂的活性超过其商业同类产品。理论计算表明，形成的贵金属纳米颗粒（NPs）与HB水解产物（即2D硼片）的相互作用比与炭黑的相互作用强得多，有助于M / B–C出色的催化耐久性。这项工作为合成具有增强的活性和耐久性的碳载贵金属电催化剂提供了一种新颖的策略。
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