Metal-Free Catalyst with Large Carbon Defects forEfficient Direct Overall Water Splitting in Air at Room Pressure
2020
Hydrogen can be used as a conventional clean energy resource, only
by obtaining it in a cheap, simple, and feasible way. From the perspective
of solar energy utilization, photocatalytic water splitting is essentially
limited by high electric energy and intermittent solar energy. Here,
we demonstrate that the carbon defects could decompose water directly
by using low-value mechanical energy in the daily environment without
using the sacrificial agent. The prepared metal-free carbon catalyst
(OPC-900) with rich graphene topological defects shows several redox
states in acetonitrile, which can accumulate redox equivalents and
respond for overall water splitting in air at room pressure. Under
stirring or light conditions, charges can be created and accumulated
on the catalyst surface and split water into H2 and O2 in low conductivity medium. The mechanical energy conversion
efficiency of stirring in ultrapure water is 7.01%. Our work combines
visible light with low-value mechanical energy for widespread decomposition
of water to produce hydrogen in air under normal pressure.
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