今日直播 | 乔世璋、王得丽、李彦光、张铁锐 | 能源催化领域最新议题

Wiley能源催化在线研讨会(Wiley Virtual Symposium on Energy Catalysis) 将于今天下午进行,四位能源催化领域的明星学者(乔世璋教授、王得丽教授、李彦光教授、张铁锐教授),将与观众们分享科研成果与经验。

会议时间

2020年9月26日(今天),下午13:30-16:00

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Electrocatalysis for Water Splitting Processes 

Replacement of precious metal catalysts by commercially available alternatives is of great importance among both fundamental and practical catalysis research. Nanostructured graphene-based and transition metal materials have demonstrated promising catalytic properties in a wide range of energy generation/storage applications. Specifically engineering graphene with guest metals/metal-free atoms can improve its catalytic activity for electrochemical oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), thus can be considered as potential substitutes for the expensive Pt/C or IrO2 catalysts in water splitting process. In this presentation, I will talk about the synthesis of nonprecious metal and metal free elements-doped graphene, and their application on electrocatalysis. The excellent OER and HER performance indicate that new materials are promising highly efficient electrocatalysts for hydrogen production.

有序金属间化合物电催化

燃料电池性能的高低在很大程度上受催化剂性能好坏的影响,然而,目前质子交换膜燃料电池的有效电催化剂仍是以金属铂(Pt)为主。由于Pt资源的匮乏以及价格的昂贵,造成燃料电池的成本较高,限制了其大规模的商品化应用。解决途径有两种:一是提高铂基催化剂的利用率;另外一种是发展非铂基催化剂。在提高Pt的利用率方面,我们课题组主要是构筑新型的Pt基有序金属间化合物催化材料,通过改变Pt与过渡金属原子种类、比例及后处理温度来改善Pt基催化剂的表面结构、合金度及电子结构等,调控其电催化性能。另一方面,有序金属间化合物材料的形貌调控一直是本领域的一大挑战,我们在形貌调控方面进行了初步尝试进。

Bismuth-Based Nanostructures for Electrochemical CO2 Reduction to Formate

Electrochemical CO2 reduction reaction converts CO2 to renewable fuels and industrial building-block chemicals, and is advocated as a key step in the artificial carbon cycle. Among various possible reduction products, formic acid or formate is considered to be one of the most commercially viable products by recent technoeconomic analyses. Most current attention focuses on Sn-based materials, which unfortunately exhibit moderate-to-high formate selectivity only within a very narrow and highly cathodic potential region. Bi has a great potential for formate production but remains under-explored. In this presentation, we report several different strategies to prepare Bi-based nanostructures. The final products exhibit large cathodic current density, excellent Faradaic efficiency over a broad potential window and great stability for CO2 reduction to formate. Furthermore, we couple Bi with an oxygen evolution reaction electrocatalyst in full cells, and achieve battery-driven or solar-driven splitting of CO2/H2O into formate and oxygen at high energy conversion efficiency. We also pursue flow cell measurements and demonstrate current density close to 300 mA/cm2, which substantially exceeds the commercialization requirement.

水滑石基纳米光催化材料合成太阳燃料和高附加值化学品

光催化技术被认为是解决能源问题的最有应用前景的技术之一。发展新型高效的光催化材料是该技术实用化的关键。水滑石基纳米结构材料因其电子结构可调、价格低廉等众多优势,而成为光催化领域的研究热点。近几年来,我们研究团队通过在水滑石表面引入缺陷结构增加活性位,增强了对反应物CO2、N2等的吸附和活化,进而提升催化活性。另外,通过构造界面活性位,调控中间物种的反应路径,从而实现高附加值产品的高选择性合成。