Lu Qi, Hutchings Gregory S, Yu Weiting, Zhou Yang, Forest Robert V, Tao Runzhe, Rosen Jonathan, Yonemoto Bryan T, Cao Zeyuan, Zheng Haimei, Xiao John Q, Jiao Feng, Chen Jingguang G
1] Center for Catalytic Science and Technology, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA [2] Department of Chemical Engineering, Columbia University, New York, New York 10027, USA.
Center for Catalytic Science and Technology, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA.
Nat Commun. 2015 Mar 16;6:6567. doi: 10.1038/ncomms7567.
A robust and efficient non-precious metal catalyst for hydrogen evolution reaction is one of the key components for carbon dioxide-free hydrogen production. Here we report that a hierarchical nanoporous copper-titanium bimetallic electrocatalyst is able to produce hydrogen from water under a mild overpotential at more than twice the rate of state-of-the-art carbon-supported platinum catalyst. Although both copper and titanium are known to be poor hydrogen evolution catalysts, the combination of these two elements creates unique copper-copper-titanium hollow sites, which have a hydrogen-binding energy very similar to that of platinum, resulting in an exceptional hydrogen evolution activity. In addition, the hierarchical porosity of the nanoporous copper-titanium catalyst also contributes to its high hydrogen evolution activity, because it provides a large-surface area for electrocatalytic hydrogen evolution, and improves the mass transport properties. Moreover, the catalyst is self-supported, eliminating the overpotential associated with the catalyst/support interface.
一种用于析氢反应的坚固且高效的非贵金属催化剂是无二氧化碳制氢的关键组成部分之一。在此我们报告，一种分级纳米多孔铜钛双金属电催化剂能够在温和的过电位下从水中产生氢气，其速率是最先进的碳载铂催化剂的两倍多。尽管已知铜和钛都是较差的析氢催化剂，但这两种元素的组合创造了独特的铜 - 铜 - 钛空心位点，其氢结合能与铂非常相似，从而产生了卓越的析氢活性。此外，纳米多孔铜钛催化剂的分级孔隙率也有助于其高析氢活性，因为它为电催化析氢提供了大表面积，并改善了传质性能。而且，该催化剂是自支撑的，消除了与催化剂/载体界面相关的过电位。
