Journal
SUSTAINABLE ENERGY & FUELS
Volume 1, Issue 10, Pages 2172-2180Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7se00454k
Keywords
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Funding
- Scientific Research Foundation for the Returned Overseas Chinese Scholars
- Ministry of Education of China
- Chongqing Natural Science Foundation [cstc2015jcyjA50029]
- Fundamental Research Funds for the Central Universities [XDJK2017B057]
- Start-up grant from Southwest University, China [SWU114090]
- Program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]
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Highly active, durable, and low-cost hydrogen evolution reaction (HER) catalysts are critical for large-scale energy storage in the form of hydrogen through water splitting but their fabrication presents great challenges. Herein we report the synthesis of a novel 3D hierarchical nanoporous CoP nanoflowers/pristine graphene interconnected network structure via diethylenetriamine (DETA)-mediated self-assembly, in which DETA promoted the uniform dispersion of graphene and the nucleation of the CoP precursor on graphene, the seed aggregation facilitated the formation of nanoflowers and a 3D network, and the gas release during the low-temperature phosphidation produced nanopores inside the nanoflowers. This nanoarchitecture shows an onset potential of -0.014 V, an overpotential of 98.1 mV to achieve 10 mA cm(-2), a Tafel slope of 40.9 mV dec(-1), and an exchange current density of 0.119 mA cm(-2). The onset overpotential, overpotential to achieve 10 mA cm(-2), and Tafel slope are all among the lowest reported for non-noble metal hydrogen evolution reaction (HER) catalysts, and the exchange current density also compares favorably to those of most reported HER catalysts. In addition, the catalyst exhibits excellent durability with negligible loss in current density after 2000 cyclic voltammetry (CV) cycles (+0.01 to -0.17 V vs. the RHE, at a scan rate of 100 mV s(-1)) or 23.5 h of chronoamperometric measurement at an overpotential of 98.1 mV, and a high faradaic efficiency of close to 100%. This work not only creates a high-performance and inexpensive HER electrocatalyst by utilizing the great advantages of 3D hierarchically nanostructured networks, but also develops a facile and economical strategy for the self-assembly of hierarchical nanostructures and offers scientific insight into its mechanism.
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