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Double-shelled hollow bimetallic phosphide nanospheres anchored on nitrogen-doped graphene for boosting water electrolysis

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Abstract

Water electrolysis is considered a key step in future hydrogen energy strategies. However, the current bottleneck of this technology lies in the cost and efficiency of electrocatalysts. To obtain non-precious metal-based catalysts with rationally designed structures towards high efficiency, herein, a structure of graphene-supported double-shelled hollow nanospheres derived from a metal–organic framework is synthesized. These sub-100 nm nanospheres are composed of a bimetallic Ni2P/FeP inner shell with a carbon outer skin, which, together with the conductive graphene support, provides a largely exposed active area, high conductivity and outstanding stability. This catalyst demonstrates excellent performance in the OER with an ultra-low overpotential of 211 mV to drive 10 mA cm−2 and a small Tafel slope of 43 mV dec−1, which outperforms the most recently reported OER catalysts. It also exhibits bi-functionality for both the HER and OER with remarkable stability, thus can be applied as an efficient electrocatalyst for overall water splitting with a low cell potential of 1.578 V for 10 mA cm−2.

Graphical abstract: Double-shelled hollow bimetallic phosphide nanospheres anchored on nitrogen-doped graphene for boosting water electrolysis

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Article information


Submitted
10 Jul 2020
Accepted
07 Oct 2020
First published
08 Oct 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Double-shelled hollow bimetallic phosphide nanospheres anchored on nitrogen-doped graphene for boosting water electrolysis

D. Yang, Z. Su, Y. Chen, Y. Lu, B. Yu, K. Srinivas, B. Wang and W. Zhang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA06766K

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